{"title":"Kidde Sentry Mains Smoke \u0026 Heat Detectors","description":"","products":[{"product_id":"kidde-kf21-sentry-mains-ac-optical-smoke-alarm-9v-alkaline-battery-back-up-with-quick-fit-base","title":"Kidde KF21 Sentry Mains Powered Optical Smoke Alarm with 9V Alkaline Battery Back-Up c\/w Quick Fit Base","description":"\u003ch1\u003eKidde KF21 Sentry Mains Powered Optical Smoke Alarm with 9V Battery Back-Up\u003c\/h1\u003e\n\u003cp\u003eThe \u003cstrong\u003eKidde KF21 Sentry Optical Smoke Alarm\u003c\/strong\u003e is a reliable mains-powered smoke detector designed to provide early warning of slow, smouldering fires within residential properties. Featuring an advanced optical sensor, the KF21 is ideal for hallways, landings, bedrooms, living areas and loft spaces, helping to improve fire safety throughout the home.\u003c\/p\u003e\n\u003cp\u003eThis interconnectable smoke alarm can be linked with up to 23 compatible Kidde FIREX smoke, heat and carbon monoxide alarms, ensuring that when one alarm detects danger, all connected alarms sound simultaneously for maximum protection.\u003c\/p\u003e\n\u003cp\u003eDesigned with installers in mind, the KF21 includes a \u003cstrong\u003eQuick-Fit Slide-On Base\u003c\/strong\u003e for fast and tidy installation, while the 150mm flared base plate neatly covers marks left by larger existing alarms during retrofit projects.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMains-powered optical smoke alarm with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 compatible Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAdvanced optical sensor for detecting slow, smouldering fires\u003c\/li\u003e\n\u003cli\u003eQuick-Fit Slide-On Base for rapid installation\u003c\/li\u003e\n\u003cli\u003e150mm flared base plate for clean retrofitting\u003c\/li\u003e\n\u003cli\u003eIntegrated cable management for secure and tidy wiring\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the triggered alarm within the network\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button for testing and silencing nuisance alarms\u003c\/li\u003e\n\u003cli\u003eAuto reset following alarm activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eSuitable for lofts, hallways, bedrooms and living rooms\u003c\/li\u003e\n\u003cli\u003eFully compatible with Kidde FIREX smoke, heat and CO alarms\u003c\/li\u003e\n\u003cli\u003e10-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eIdeal Applications\u003c\/h2\u003e\n\u003cp\u003eThe Kidde KF21 optical smoke alarm is suitable for installation in:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHallways and circulation routes\u003c\/li\u003e\n\u003cli\u003eBedrooms\u003c\/li\u003e\n\u003cli\u003eLiving rooms\u003c\/li\u003e\n\u003cli\u003eAttics and loft spaces\u003c\/li\u003e\n\u003cli\u003eResidential properties requiring Grade D2 fire detection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eOptical smoke alarms are particularly effective at detecting slow-burning fires caused by upholstery, electrical faults or cigarettes, making them ideal for living spaces and escape routes.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF21\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Optical with dust compensation and bug screen\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e Minimum 85dB at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Frequency:\u003c\/strong\u003e 3.2 kHz typical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterconnectivity:\u003c\/strong\u003e Up to 23 compatible alarms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Grade:\u003c\/strong\u003e D2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApprovals:\u003c\/strong\u003e BSI certified to BS EN14604:2005\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 53mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 295g including battery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHumidity Range:\u003c\/strong\u003e Up to 93% RH non-condensing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompliance \u0026amp; Installation\u003c\/h2\u003e\n\u003cp\u003eThe Kidde KF21 complies with UK Building Regulations and BS 5839 Part 6 requirements for Grade D domestic fire alarm systems. Installation should be carried out by a qualified electrician. For kitchen installations, a dedicated Kidde FIREX heat alarm is recommended instead of a smoke alarm.\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/h9KdZktsF9A?si=0K3hkDAtyg1YqcJD\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003ch2\u003eDownloads\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eData Sheet:\u003c\/strong\u003e\u003cbr\u003e\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/cLZXN-22ToQPRSsziH882At4tMbmU8m8g_VkuEP2TCY.pdf\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eDownload Data Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInstruction Manual:\u003c\/strong\u003e\u003cbr\u003e\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/5E_Cqq3RopAzls8aPoJmvHQMeuuRxjlrsjQeILwJrPw.pdf\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eDownload Instruction Manual\u003c\/a\u003e\u003c\/p\u003e","brand":"Kidde","offers":[{"title":"Default Title","offer_id":58118395625856,"sku":"KF21","price":21.38,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0553\/2349\/2557\/files\/width_1920_height_1920.png?v=1779200356"},{"product_id":"kidde-kf31-sentry-mains-ac-heat-alarm-9v-alkaline-battery-back-up-with-quick-fit-base","title":"Kidde KF31 Sentry Mains Powered Heat Alarm with 9V Alkaline Battery Back-Up c\/w Quick Fit Base","description":"\u003ch1\u003eKidde KF31 Sentry Mains Powered Interconnectable Heat Alarm with 9V Battery Back-Up\u003c\/h1\u003e\n\u003cp\u003eThe \u003cstrong\u003eKidde KF31 Sentry Heat Alarm\u003c\/strong\u003e is a high-performance mains-powered heat detector designed for use in kitchens, garages, lofts and other areas where smoke alarms may be unsuitable. Featuring a reliable thermistor heat sensor, the KF31 responds quickly to dangerous rises in temperature while helping to minimise false alarms caused by cooking fumes, steam or dust.\u003c\/p\u003e\n\u003cp\u003eThis interconnectable heat alarm can be linked with up to 23 compatible Kidde FIREX smoke, heat and carbon monoxide alarms. When one connected alarm detects danger, all units sound simultaneously to provide enhanced protection throughout the property.\u003c\/p\u003e\n\u003cp\u003eSupplied with Kidde’s \u003cstrong\u003eQuick-Fit Slide-On Base\u003c\/strong\u003e, the KF31 allows for quicker and cleaner installation. The integrated cable management system keeps wiring organised, while the 150mm flared base plate provides a neat finish during retrofit installations.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMains-powered heat alarm with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003eThermistor heat sensor for dependable temperature detection\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 compatible Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eQuick-Fit Slide-On Base for fast and simple installation\u003c\/li\u003e\n\u003cli\u003e150mm flared base for clean retrofitting of existing alarms\u003c\/li\u003e\n\u003cli\u003eIntegrated cable management for tidy wiring connections\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated unit within the network\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button for testing and silencing nuisance alarms\u003c\/li\u003e\n\u003cli\u003eAutomatic reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking device prevents unauthorised removal\u003c\/li\u003e\n\u003cli\u003eSuitable for kitchens, garages, lofts and dusty environments\u003c\/li\u003e\n\u003cli\u003eFully compatible with Kidde FIREX smoke, heat and CO alarms\u003c\/li\u003e\n\u003cli\u003e10-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eIdeal Applications\u003c\/h2\u003e\n\u003cp\u003eThe Kidde KF31 heat alarm is ideal for locations where smoke alarms may trigger unnecessary alarms due to steam, dust or cooking fumes, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eKitchens\u003c\/li\u003e\n\u003cli\u003eGarages\u003c\/li\u003e\n\u003cli\u003eLoft spaces\u003c\/li\u003e\n\u003cli\u003eUtility rooms\u003c\/li\u003e\n\u003cli\u003eResidential properties requiring Grade D2 fire detection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF31\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Thermistor (thermal resistor) heat sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e Minimum 85dB at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Frequency:\u003c\/strong\u003e 3.2 kHz typical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterconnectivity:\u003c\/strong\u003e Up to 23 compatible alarms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Grade:\u003c\/strong\u003e D2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApprovals:\u003c\/strong\u003e BSI certified to BS 5446 Part 2:2003\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 150mm x 66mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 281g including battery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHumidity Range:\u003c\/strong\u003e Up to 93% RH non-condensing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompliance \u0026amp; Installation\u003c\/h2\u003e\n\u003cp\u003eThe Kidde KF31 complies with UK Building Regulations and BS 5839 Part 6 requirements for Grade D domestic fire alarm systems. Installation should be carried out by a qualified electrician. Heat alarms are particularly recommended for kitchens and other areas where optical smoke alarms may be prone to nuisance triggering.\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/h9KdZktsF9A?si=0K3hkDAtyg1YqcJD\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003ch2\u003eDownloads\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eData Sheet:\u003c\/strong\u003e\u003cbr\u003e\u003ca rel=\"noopener noreferrer\" href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/SITv1sqYJTD_5p71Au0BPbmur0mGCPGQqX8LEHOVsKI.pdf\" target=\"_blank\"\u003eDownload Data Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInstruction Manual:\u003c\/strong\u003e\u003cbr\u003e\u003ca rel=\"noopener noreferrer\" href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/QtetLpZzr0zryso8Up1OCpp-nxIUUER8nD1yW75h6Xg.pdf\" target=\"_blank\"\u003eDownload Instruction Manual\u003c\/a\u003e\u003c\/p\u003e","brand":"Kidde","offers":[{"title":"Default Title","offer_id":58118396805504,"sku":"KF31","price":37.18,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0553\/2349\/2557\/files\/width_1920_height_1920_9fc33d31-d511-4cd2-810a-ac8d5c0dd169.png?v=1779200357"},{"product_id":"kidde-kf21r-sentry-mains-ac-optical-smoke-alarm-sealed-in-rechargeable-lithium-battery-back-up-with-quick-fit-base","title":"Kidde KF21R Sentry Mains Powered Optical Smoke Alarm with Sealed-In Rechargeable Lithium Battery Back-Up c\/w Quick Fit Base","description":"\u003ch1\u003eKidde KF21R Sentry Mains Powered Optical Smoke Alarm with Rechargeable Lithium Battery Back-Up\u003c\/h1\u003e\n\u003cp\u003eThe \u003cstrong\u003eKidde KF21R Sentry Optical Smoke Alarm\u003c\/strong\u003e is a high-performance mains-powered smoke detector designed to provide dependable fire detection throughout residential properties. Featuring an advanced optical sensor, the KF21R is ideal for detecting slow, smouldering fires commonly caused by upholstered furniture, electrical faults and cigarettes.\u003c\/p\u003e\n\u003cp\u003eEquipped with a sealed rechargeable lithium battery back-up, this alarm continues to operate during mains power failures without the need for battery replacement. The KF21R can also be interconnected with up to 23 compatible Kidde FIREX smoke, heat and carbon monoxide alarms, ensuring all alarms sound simultaneously when danger is detected.\u003c\/p\u003e\n\u003cp\u003eDesigned for straightforward installation, the alarm features Kidde’s \u003cstrong\u003eQuick-Fit Slide-On Base\u003c\/strong\u003e for fast, tool-free fitting. The integrated cable management system helps maintain tidy wiring, while the 150mm flared base provides a neat finish during retrofit projects.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMains-powered optical smoke alarm with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 compatible Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eOptical sensor technology for detecting slow, smouldering fires\u003c\/li\u003e\n\u003cli\u003eQuick-Fit Slide-On Base for fast, tool-free installation\u003c\/li\u003e\n\u003cli\u003e150mm flared base plate for neat retrofitting\u003c\/li\u003e\n\u003cli\u003eIntegrated cable management for secure and tidy wiring\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated unit within the network\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button for easy testing and temporary silencing\u003c\/li\u003e\n\u003cli\u003eAutomatic reset after alarm activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism for added security\u003c\/li\u003e\n\u003cli\u003eSuitable for lofts, hallways, bedrooms and living areas\u003c\/li\u003e\n\u003cli\u003eFully compatible with Kidde FIREX smoke, heat and CO alarms\u003c\/li\u003e\n\u003cli\u003e10-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eIdeal Applications\u003c\/h2\u003e\n\u003cp\u003eThe Kidde KF21R optical smoke alarm is recommended for installation in:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHallways and circulation routes\u003c\/li\u003e\n\u003cli\u003eBedrooms\u003c\/li\u003e\n\u003cli\u003eLiving rooms\u003c\/li\u003e\n\u003cli\u003eAttics and loft spaces\u003c\/li\u003e\n\u003cli\u003eResidential Grade D1 fire alarm systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eOptical smoke alarms are particularly effective at detecting slow-burning fires and are ideal for escape routes and living spaces.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF21R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Optical with dust compensation and bug screen\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e Minimum 85dB at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Frequency:\u003c\/strong\u003e 3.2 kHz typical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterconnectivity:\u003c\/strong\u003e Up to 23 compatible alarms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Grade:\u003c\/strong\u003e D1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApprovals:\u003c\/strong\u003e BSI certified to BS EN14604:2005\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 150mm x 53mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 260g including battery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHumidity Range:\u003c\/strong\u003e Up to 93% RH non-condensing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompliance \u0026amp; Installation\u003c\/h2\u003e\n\u003cp\u003eThe Kidde KF21R complies with UK Building Regulations and BS 5839 Part 6 standards for Grade D domestic fire alarm systems. Installation should be completed by a qualified electrician. For kitchen installations, a dedicated Kidde FIREX heat alarm is recommended instead of a smoke alarm.\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/h9KdZktsF9A?si=0K3hkDAtyg1YqcJD\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003ch2\u003eDownloads\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eData Sheet:\u003c\/strong\u003e\u003cbr\u003e\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/N1qtN-KTPiGxV4FCNukEVy8KrHFuo3kFjmynmZb3DAM.pdf\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eDownload Data Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInstruction Manual:\u003c\/strong\u003e\u003cbr\u003e\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/5E_Cqq3RopAzls8aPoJmvHQMeuuRxjlrsjQeILwJrPw.pdf\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eDownload Instruction Manual\u003c\/a\u003e\u003c\/p\u003e","brand":"Kidde","offers":[{"title":"Default Title","offer_id":58118397231488,"sku":"KF21R","price":49.33,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0553\/2349\/2557\/files\/width_1920_height_1920_6a0c9bd0-cbd3-4dcf-aed0-450538d71388.png?v=1779200359"},{"product_id":"kidde-kf31r-sentry-mains-ac-heat-alarm-sealed-in-rechargeable-lithium-battery-back-up-with-quick-fit-base","title":"Kidde KF31R Sentry Mains Powered Heat Alarm with Sealed-In Rechargeable Lithium Battery Back-Up c\/w Quick Fit Base","description":"\u003ch1\u003eKidde KF31R Sentry Mains Powered Heat Alarm with Rechargeable Lithium Battery Back-Up\u003c\/h1\u003e\n\u003cp\u003eThe \u003cstrong\u003eKidde KF31R Sentry Heat Alarm\u003c\/strong\u003e is a mains-powered interconnectable heat detector designed for reliable fire protection in kitchens, garages, loft spaces and other areas where smoke alarms may be unsuitable. Using a thermistor heat sensor, the KF31R quickly detects dangerous increases in temperature while helping to reduce nuisance alarms caused by steam, dust or cooking fumes.\u003c\/p\u003e\n\u003cp\u003eFeaturing a sealed rechargeable lithium battery back-up, the alarm continues to provide protection during power outages without requiring battery replacement. The KF31R can also be interconnected with up to 23 compatible Kidde FIREX smoke, heat and carbon monoxide alarms, ensuring all connected alarms sound simultaneously when danger is detected.\u003c\/p\u003e\n\u003cp\u003eDesigned for straightforward installation, the alarm includes Kidde’s \u003cstrong\u003eQuick-Fit Slide-On Base\u003c\/strong\u003e for faster fitting and integrated cable management for tidy, secure wiring. The 150mm flared base also provides a clean finish when replacing older or larger alarms.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMains-powered heat alarm with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003eThermistor heat sensor for dependable heat detection\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 compatible Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eQuick-Fit Slide-On Base for rapid installation\u003c\/li\u003e\n\u003cli\u003e150mm flared base plate for clean retrofitting\u003c\/li\u003e\n\u003cli\u003eIntegrated cable management for organised wiring\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated alarm within the network\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button for testing and temporary silencing\u003c\/li\u003e\n\u003cli\u003eAutomatic reset after alarm activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism for added safety\u003c\/li\u003e\n\u003cli\u003eSuitable for kitchens, garages, lofts and humid environments\u003c\/li\u003e\n\u003cli\u003eFully compatible with Kidde FIREX smoke, heat and CO alarms\u003c\/li\u003e\n\u003cli\u003e10-year warranty including rechargeable battery\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eIdeal Applications\u003c\/h2\u003e\n\u003cp\u003eThe Kidde KF31R heat alarm is ideal for installation in:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eKitchens\u003c\/li\u003e\n\u003cli\u003eGarages\u003c\/li\u003e\n\u003cli\u003eLoft spaces\u003c\/li\u003e\n\u003cli\u003eUtility rooms\u003c\/li\u003e\n\u003cli\u003eResidential Grade D1 fire alarm systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eHeat alarms are particularly suitable for areas where optical smoke alarms may be prone to nuisance triggering from steam, fumes or airborne particles.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF31R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Thermistor (thermal resistor) heat sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e Minimum 85dB at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Frequency:\u003c\/strong\u003e 3.2 kHz typical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterconnectivity:\u003c\/strong\u003e Up to 23 compatible alarms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Grade:\u003c\/strong\u003e D1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApprovals:\u003c\/strong\u003e BSI certified to BS 5446 Part 2:2003\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 66mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 245g including battery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHumidity Range:\u003c\/strong\u003e Up to 93% RH non-condensing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years including battery\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompliance \u0026amp; Installation\u003c\/h2\u003e\n\u003cp\u003eThe Kidde KF31R complies with UK Building Regulations and BS 5839 Part 6 standards for Grade D domestic fire alarm systems. Installation should be completed by a qualified electrician. Heat alarms are recommended for kitchens and other environments where smoke alarms may be affected by steam, dust or fumes.\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/h9KdZktsF9A?si=0K3hkDAtyg1YqcJD\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003ch2\u003eDownloads\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eData Sheet:\u003c\/strong\u003e\u003cbr\u003e\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/xNd9FoIq-vcqzIQOFyRYOdCzaM-sDYjr6hjJWbs8s7w.pdf\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eDownload Data Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInstruction Manual:\u003c\/strong\u003e\u003cbr\u003e\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/QtetLpZzr0zryso8Up1OCpp-nxIUUER8nD1yW75h6Xg.pdf\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eDownload Instruction Manual\u003c\/a\u003e\u003c\/p\u003e","brand":"Kidde","offers":[{"title":"Default Title","offer_id":58118397755776,"sku":"KF31R","price":53.55,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0553\/2349\/2557\/files\/width_1920_height_1920_89a6d27b-07aa-4430-8ed9-251681fcba44.png?v=1779200362"},{"product_id":"kidde-sentry-1x-kf21-optical-smoke-1x-kf31-heat-alarm-kit-mains-ac-9v-alkaline-battery-back-up-c-w-quick-fit-base","title":"Kidde Sentry 1x KF21 Optical Smoke \u0026 1x KF31 Heat Alarm Kit Mains Powered with 9V Alkaline Battery Back-Up c\/w Quick Fit Base","description":"\u003ch1\u003eKidde Sentry KF21 \u0026amp; KF31 Mains Powered Smoke and Heat Alarm Kit with 9V Battery Back-Up\u003c\/h1\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eKidde Sentry Alarm Kit\u003c\/strong\u003e combines the reliable \u003cstrong\u003eKF21 Optical Smoke Alarm\u003c\/strong\u003e and \u003cstrong\u003eKF31 Heat Alarm\u003c\/strong\u003e to provide comprehensive fire detection throughout residential properties. Designed for mains-powered installation, both alarms feature 9V alkaline battery back-up protection and can be interconnected with up to 23 compatible Kidde FIREX alarms for complete home safety coverage.\u003c\/p\u003e\n\n\u003cp\u003eThis convenient alarm combination is ideal for meeting UK Building Regulations in domestic properties, offering dependable smoke and heat detection across living spaces, hallways, kitchens, garages and loft areas.\u003c\/p\u003e\n\n\u003cp\u003eEach alarm is supplied with Kidde’s \u003cstrong\u003eQuick-Fit Slide-On Base\u003c\/strong\u003e for faster installation, while integrated cable management keeps wiring neat and secure. The 150mm flared base also provides a tidy finish when replacing existing alarms.\u003c\/p\u003e\n\n\u003ch2\u003eKit Contents\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e1 x Kidde KF21 Optical Smoke Alarm\u003c\/li\u003e\n\u003cli\u003e1 x Kidde KF31 Heat Alarm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF21 Optical Smoke Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF21 optical smoke alarm is designed to detect slow, smouldering fires commonly caused by furniture, electrical faults and cigarettes. Ideal for escape routes and living areas, the alarm provides dependable early warning protection.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered optical smoke alarm with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003eOptical sensor with dust compensation and bug screen\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the triggered unit\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eSuitable for hallways, bedrooms, lofts and living rooms\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS EN14604:2005\u003c\/li\u003e\n\u003cli\u003e10-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF31 Heat Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF31 heat alarm is ideal for kitchens, garages and loft spaces where smoke alarms may be affected by steam, cooking fumes or dust. The thermistor heat sensor provides reliable temperature detection without nuisance alarms.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered heat alarm with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003eThermistor heat sensor for reliable heat detection\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the triggered unit\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eIdeal for kitchens, garages and humid environments\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS 5446 Part 2:2003\u003c\/li\u003e\n\u003cli\u003e10-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKey Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eComplete smoke and heat detection solution for residential properties\u003c\/li\u003e\n\u003cli\u003eInterlinked alarms provide whole-home warning when danger is detected\u003c\/li\u003e\n\u003cli\u003eQuick-Fit bases for fast and clean installation\u003c\/li\u003e\n\u003cli\u003eIntegrated cable management for tidy wiring\u003c\/li\u003e\n\u003cli\u003eSuitable for compliance with UK Building Regulations\u003c\/li\u003e\n\u003cli\u003eGrade D fire alarm system solution\u003c\/li\u003e\n\u003cli\u003eFully compatible with Kidde FIREX smoke, heat and CO alarms\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ch3\u003eKF21 Optical Smoke Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF21\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Optical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 53mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 295g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKF31 Heat Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF31\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Thermistor heat sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 150mm x 66mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 281g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePlease Note:\u003c\/strong\u003e Alarms are supplied individually within the kit. Installation should be completed by a qualified electrician.\u003c\/p\u003e\n\n\u003ch2\u003eDownloads\u003c\/h2\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21 Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/cLZXN-22ToQPRSsziH882At4tMbmU8m8g_VkuEP2TCY.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21 Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31 Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/SITv1sqYJTD_5p71Au0BPbmur0mGCPGQqX8LEHOVsKI.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31 Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21 Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/5E_Cqq3RopAzls8aPoJmvHQMeuuRxjlrsjQeILwJrPw.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21 Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31 Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/QtetLpZzr0zryso8Up1OCpp-nxIUUER8nD1yW75h6Xg.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31 Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e","brand":"Kidde","offers":[{"title":"Default Title","offer_id":58118875480448,"sku":"KF21+KF31","price":58.56,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0553\/2349\/2557\/files\/KF21_KF31_Shopify.jpg?v=1779203402"},{"product_id":"kidde-sentry-2x-kf21-optical-smoke-1x-kf31-heat-alarm-kit-mains-ac-9v-alkaline-battery-back-up-c-w-quick-fit-base","title":"Kidde Sentry 2x KF21 Optical Smoke \u0026 1x KF31 Heat Alarm Kit Mains Powered with 9V Alkaline Battery Back-Up c\/w Quick Fit Base","description":"\u003ch1\u003eKidde Sentry 2x KF21 Optical Smoke \u0026amp; 1x KF31 Heat Alarm Kit with 9V Battery Back-Up\u003c\/h1\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eKidde Sentry Alarm Kit\u003c\/strong\u003e combines \u003cstrong\u003etwo KF21 Optical Smoke Alarms\u003c\/strong\u003e and \u003cstrong\u003eone KF31 Heat Alarm\u003c\/strong\u003e to deliver comprehensive fire detection for residential properties. Designed for mains-powered installation, all alarms feature 9V alkaline battery back-up and can be interconnected with up to 23 compatible Kidde FIREX alarms for reliable whole-home protection.\u003c\/p\u003e\n\n\u003cp\u003eThis alarm bundle is ideal for meeting UK Building Regulations in domestic properties, providing dependable smoke detection in living areas and hallways, alongside heat detection in kitchens, garages and loft spaces.\u003c\/p\u003e\n\n\u003cp\u003eEach alarm is supplied with Kidde’s \u003cstrong\u003eQuick-Fit Slide-On Base\u003c\/strong\u003e for faster installation, while integrated cable management keeps wiring neat and secure. The 150mm flared base also allows for a tidy retrofit when replacing existing alarms.\u003c\/p\u003e\n\n\u003ch2\u003eKit Contents\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e2 x Kidde KF21 Optical Smoke Alarms\u003c\/li\u003e\n\u003cli\u003e1 x Kidde KF31 Heat Alarm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF21 Optical Smoke Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF21 optical smoke alarm is designed to detect slow, smouldering fires commonly caused by electrical faults, furniture or cigarettes. Ideal for circulation routes and living spaces, the KF21 provides reliable early warning protection.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered optical smoke alarm with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003eOptical sensor with dust compensation and bug screen\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the triggered alarm\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eSuitable for hallways, bedrooms, lofts and living rooms\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS EN14604:2005\u003c\/li\u003e\n\u003cli\u003e10-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF31 Heat Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF31 heat alarm is specifically designed for kitchens, garages and loft spaces where smoke alarms may be unsuitable due to steam, fumes or dust. The thermistor heat sensor delivers dependable heat detection while helping to minimise nuisance alarms.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered heat alarm with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003eThermistor heat sensor for reliable temperature detection\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the triggered alarm\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eIdeal for kitchens, garages and loft spaces\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS 5446 Part 2:2003\u003c\/li\u003e\n\u003cli\u003e10-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKey Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eComplete smoke and heat alarm solution for residential properties\u003c\/li\u003e\n\u003cli\u003eInterlinked alarms provide whole-home warning when danger is detected\u003c\/li\u003e\n\u003cli\u003eQuick-Fit bases for fast and clean installation\u003c\/li\u003e\n\u003cli\u003eIntegrated cable management for tidy wiring\u003c\/li\u003e\n\u003cli\u003eSuitable for compliance with UK Building Regulations\u003c\/li\u003e\n\u003cli\u003eGrade D domestic fire alarm system solution\u003c\/li\u003e\n\u003cli\u003eFully compatible with Kidde FIREX smoke, heat and CO alarms\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ch3\u003eKF21 Optical Smoke Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF21\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Optical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 53mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 295g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKF31 Heat Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF31\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Thermistor heat sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 150mm x 66mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 281g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePlease Note:\u003c\/strong\u003e Alarms are supplied individually within the kit. Installation should be carried out by a qualified electrician.\u003c\/p\u003e\n\n\u003ch2\u003eDownloads\u003c\/h2\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21 Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/cLZXN-22ToQPRSsziH882At4tMbmU8m8g_VkuEP2TCY.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21 Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31 Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/SITv1sqYJTD_5p71Au0BPbmur0mGCPGQqX8LEHOVsKI.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31 Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21 Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/5E_Cqq3RopAzls8aPoJmvHQMeuuRxjlrsjQeILwJrPw.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21 Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31 Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/QtetLpZzr0zryso8Up1OCpp-nxIUUER8nD1yW75h6Xg.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31 Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e","brand":"Kidde","offers":[{"title":"Default Title","offer_id":58118875840896,"sku":"KF21x2+KF31","price":79.94,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0553\/2349\/2557\/files\/KF21x2_KF31_Shopify.jpg?v=1779203402"},{"product_id":"kidde-sentry-3x-kf21-optical-smoke-1x-kf31-heat-alarm-kit-mains-ac-9v-alkaline-battery-back-up-c-w-quick-fit-base","title":"Kidde Sentry 3x KF21 Optical Smoke \u0026 1x KF31 Heat Alarm Kit Mains Powered with 9V Alkaline Battery Back-Up c\/w Quick Fit Base","description":"\u003ch1\u003eKidde Sentry 3x KF21 Optical Smoke \u0026amp; 1x KF31 Heat Alarm Kit with 9V Battery Back-Up\u003c\/h1\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eKidde Sentry Alarm Kit\u003c\/strong\u003e combines \u003cstrong\u003ethree KF21 Optical Smoke Alarms\u003c\/strong\u003e and \u003cstrong\u003eone KF31 Heat Alarm\u003c\/strong\u003e to provide comprehensive fire detection coverage throughout residential properties. Designed for mains-powered installation, each alarm features a 9V alkaline battery back-up and can be interconnected with up to 23 compatible Kidde FIREX alarms for complete whole-home protection.\u003c\/p\u003e\n\n\u003cp\u003eThis alarm bundle is ideal for larger homes and multi-room residential properties, offering dependable smoke detection in hallways, landings, bedrooms and living areas, alongside dedicated heat detection for kitchens, garages and loft spaces.\u003c\/p\u003e\n\n\u003cp\u003eEach alarm is supplied with Kidde’s \u003cstrong\u003eQuick-Fit Slide-On Base\u003c\/strong\u003e for fast and tidy installation. Integrated cable management helps maintain organised wiring, while the 150mm flared base ensures a clean finish during retrofit installations.\u003c\/p\u003e\n\n\u003ch2\u003eKit Contents\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e3 x Kidde KF21 Optical Smoke Alarms\u003c\/li\u003e\n\u003cli\u003e1 x Kidde KF31 Heat Alarm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF21 Optical Smoke Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF21 optical smoke alarm is designed to detect slow, smouldering fires commonly caused by electrical faults, upholstery or cigarettes. Ideal for escape routes and living spaces, the KF21 provides reliable early warning protection.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered optical smoke alarm with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003eOptical sensor with dust compensation and bug screen\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated alarm\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eSuitable for hallways, bedrooms, lofts and living rooms\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS EN14604:2005\u003c\/li\u003e\n\u003cli\u003e10-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF31 Heat Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF31 heat alarm is designed for kitchens, garages and loft spaces where smoke alarms may be unsuitable due to steam, cooking fumes or dust. The thermistor heat sensor provides dependable heat detection while helping reduce nuisance alarms.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered heat alarm with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003eThermistor heat sensor for reliable heat detection\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated alarm\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eIdeal for kitchens, garages and loft spaces\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS 5446 Part 2:2003\u003c\/li\u003e\n\u003cli\u003e10-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKey Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eComprehensive smoke and heat alarm solution for larger homes\u003c\/li\u003e\n\u003cli\u003eInterlinked alarms provide whole-home warning when danger is detected\u003c\/li\u003e\n\u003cli\u003eQuick-Fit bases for fast and simple installation\u003c\/li\u003e\n\u003cli\u003eIntegrated cable management for neat wiring\u003c\/li\u003e\n\u003cli\u003eSuitable for compliance with UK Building Regulations\u003c\/li\u003e\n\u003cli\u003eGrade D domestic fire alarm system solution\u003c\/li\u003e\n\u003cli\u003eFully compatible with Kidde FIREX smoke, heat and CO alarms\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ch3\u003eKF21 Optical Smoke Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF21\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Optical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 53mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 295g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKF31 Heat Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF31\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Thermistor heat sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 150mm x 66mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 281g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePlease Note:\u003c\/strong\u003e Alarms are supplied individually within the kit. Installation should be completed by a qualified electrician.\u003c\/p\u003e\n\n\u003ch2\u003eDownloads\u003c\/h2\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21 Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/cLZXN-22ToQPRSsziH882At4tMbmU8m8g_VkuEP2TCY.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21 Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31 Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/SITv1sqYJTD_5p71Au0BPbmur0mGCPGQqX8LEHOVsKI.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31 Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21 Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/5E_Cqq3RopAzls8aPoJmvHQMeuuRxjlrsjQeILwJrPw.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21 Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31 Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/QtetLpZzr0zryso8Up1OCpp-nxIUUER8nD1yW75h6Xg.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31 Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e","brand":"Kidde","offers":[{"title":"Default Title","offer_id":58118875971968,"sku":"KF21x3+KF31","price":101.32,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0553\/2349\/2557\/files\/KF21x3_KF31_Shopify.jpg?v=1779203403"},{"product_id":"kidde-sentry-4x-kf21-optical-smoke-1x-kf31-heat-alarm-kit-mains-ac-9v-alkaline-battery-back-up-c-w-quick-fit-base","title":"Kidde Sentry 4x KF21 Optical Smoke \u0026 1x KF31 Heat Alarm Kit Mains Powered with 9V Alkaline Battery Back-Up c\/w Quick Fit Base","description":"\u003ch1\u003eKidde Sentry 4x KF21 Optical Smoke \u0026amp; 1x KF31 Heat Alarm Kit with 9V Battery Back-Up\u003c\/h1\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eKidde Sentry Alarm Kit\u003c\/strong\u003e includes \u003cstrong\u003efour KF21 Optical Smoke Alarms\u003c\/strong\u003e and \u003cstrong\u003eone KF31 Heat Alarm\u003c\/strong\u003e, providing a complete mains-powered fire detection solution for larger residential properties. Designed to deliver reliable smoke and heat detection throughout the home, each alarm features a 9V alkaline battery back-up and can be interconnected with up to 23 compatible Kidde FIREX alarms.\u003c\/p\u003e\n\n\u003cp\u003eThis interlinked alarm system ensures that when one alarm detects danger, all connected alarms sound simultaneously, helping to provide earlier warning and improved occupant safety across multiple rooms and floors.\u003c\/p\u003e\n\n\u003cp\u003eEach alarm is supplied with Kidde’s \u003cstrong\u003eQuick-Fit Slide-On Base\u003c\/strong\u003e for faster installation and includes integrated cable management to maintain neat, secure wiring. The 150mm flared base plate also provides a clean retrofit finish when replacing existing alarms.\u003c\/p\u003e\n\n\u003ch2\u003eKit Contents\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e4 x Kidde KF21 Optical Smoke Alarms\u003c\/li\u003e\n\u003cli\u003e1 x Kidde KF31 Heat Alarm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF21 Optical Smoke Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF21 optical smoke alarm is ideal for detecting slow, smouldering fires caused by electrical faults, furniture or cigarettes. Suitable for escape routes and living spaces, the optical sensor provides dependable early warning protection.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered optical smoke alarm with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003eOptical sensor with dust compensation and bug screen\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated alarm\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eSuitable for hallways, bedrooms, lofts and living areas\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS EN14604:2005\u003c\/li\u003e\n\u003cli\u003e10-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF31 Heat Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF31 heat alarm is designed for kitchens, garages and loft spaces where smoke alarms may be unsuitable due to steam, dust or cooking fumes. Its thermistor heat sensor provides reliable temperature detection while helping reduce nuisance alarms.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered heat alarm with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003eThermistor heat sensor for dependable heat detection\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated alarm\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eIdeal for kitchens, garages and loft spaces\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS 5446 Part 2:2003\u003c\/li\u003e\n\u003cli\u003e10-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKey Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eComplete smoke and heat alarm solution for larger homes\u003c\/li\u003e\n\u003cli\u003eInterlinked alarms provide whole-home warning when danger is detected\u003c\/li\u003e\n\u003cli\u003eQuick-Fit bases for fast and efficient installation\u003c\/li\u003e\n\u003cli\u003eIntegrated cable management for tidy wiring\u003c\/li\u003e\n\u003cli\u003eSuitable for compliance with UK Building Regulations\u003c\/li\u003e\n\u003cli\u003eGrade D domestic fire alarm system solution\u003c\/li\u003e\n\u003cli\u003eFully compatible with Kidde FIREX smoke, heat and CO alarms\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ch3\u003eKF21 Optical Smoke Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF21\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Optical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 53mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 295g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKF31 Heat Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF31\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Thermistor heat sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 150mm x 66mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 281g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePlease Note:\u003c\/strong\u003e Alarms are supplied individually within the kit. Installation should be completed by a qualified electrician.\u003c\/p\u003e\n\n\u003ch2\u003eDownloads\u003c\/h2\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21 Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/cLZXN-22ToQPRSsziH882At4tMbmU8m8g_VkuEP2TCY.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21 Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31 Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/SITv1sqYJTD_5p71Au0BPbmur0mGCPGQqX8LEHOVsKI.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31 Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21 Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/5E_Cqq3RopAzls8aPoJmvHQMeuuRxjlrsjQeILwJrPw.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21 Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31 Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/QtetLpZzr0zryso8Up1OCpp-nxIUUER8nD1yW75h6Xg.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31 Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e","brand":"Kidde","offers":[{"title":"Default Title","offer_id":58118876168576,"sku":"KF21x4+KF31","price":122.7,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0553\/2349\/2557\/files\/KF21x4_KF31_Shopify.jpg?v=1779203403"},{"product_id":"kidde-sentry-5x-kf21-optical-smoke-1x-kf31-heat-alarm-kit-mains-ac-9v-alkaline-battery-back-up-c-w-quick-fit-base","title":"Kidde Sentry 5x KF21 Optical Smoke \u0026 1x KF31 Heat Alarm Kit Mains Powered with 9V Alkaline Battery Back-Up c\/w Quick Fit Base","description":"\u003ch1\u003eKidde Sentry 5x KF21 Optical Smoke \u0026amp; 1x KF31 Heat Alarm Kit with 9V Battery Back-Up\u003c\/h1\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eKidde Sentry Alarm Kit\u003c\/strong\u003e combines \u003cstrong\u003efive KF21 Optical Smoke Alarms\u003c\/strong\u003e and \u003cstrong\u003eone KF31 Heat Alarm\u003c\/strong\u003e to provide complete fire detection coverage for larger homes and multi-storey residential properties. Designed for mains-powered installation, each alarm features a 9V alkaline battery back-up and can be interconnected with up to 23 compatible Kidde FIREX alarms for dependable whole-home protection.\u003c\/p\u003e\n\n\u003cp\u003eWhen one alarm detects danger, all connected alarms sound simultaneously, providing an early warning throughout the property. This makes the system ideal for improving fire safety across multiple rooms, floors and escape routes.\u003c\/p\u003e\n\n\u003cp\u003eEach alarm is supplied with Kidde’s \u003cstrong\u003eQuick-Fit Slide-On Base\u003c\/strong\u003e for fast and tidy installation. Integrated cable management helps maintain organised wiring, while the 150mm flared base plate provides a neat finish when retrofitting existing alarms.\u003c\/p\u003e\n\n\u003ch2\u003eKit Contents\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e5 x Kidde KF21 Optical Smoke Alarms\u003c\/li\u003e\n\u003cli\u003e1 x Kidde KF31 Heat Alarm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF21 Optical Smoke Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF21 optical smoke alarm is designed to detect slow, smouldering fires caused by furniture, electrical faults or cigarettes. Ideal for hallways, landings, bedrooms and living areas, the optical sensor provides reliable early fire detection.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered optical smoke alarm with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003eOptical sensor with dust compensation and bug screen\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated alarm\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eSuitable for hallways, bedrooms, lofts and living rooms\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS EN14604:2005\u003c\/li\u003e\n\u003cli\u003e10-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF31 Heat Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF31 heat alarm is designed for kitchens, garages and loft spaces where smoke alarms may be unsuitable due to cooking fumes, steam or dust. The thermistor heat sensor provides dependable heat detection while reducing nuisance alarms.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered heat alarm with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003eThermistor heat sensor for reliable heat detection\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated alarm\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eIdeal for kitchens, garages and loft spaces\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS 5446 Part 2:2003\u003c\/li\u003e\n\u003cli\u003e10-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKey Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eComprehensive smoke and heat alarm system for larger homes\u003c\/li\u003e\n\u003cli\u003eInterlinked alarms provide whole-property warning when danger is detected\u003c\/li\u003e\n\u003cli\u003eQuick-Fit bases for fast and clean installation\u003c\/li\u003e\n\u003cli\u003eIntegrated cable management for neat wiring\u003c\/li\u003e\n\u003cli\u003eSuitable for compliance with UK Building Regulations\u003c\/li\u003e\n\u003cli\u003eGrade D domestic fire alarm solution\u003c\/li\u003e\n\u003cli\u003eFully compatible with Kidde FIREX smoke, heat and CO alarms\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ch3\u003eKF21 Optical Smoke Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF21\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Optical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 53mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 295g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKF31 Heat Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF31\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Thermistor heat sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 150mm x 66mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 281g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePlease Note:\u003c\/strong\u003e Alarms are supplied individually within the kit. Installation should be completed by a qualified electrician.\u003c\/p\u003e\n\n\u003ch2\u003eDownloads\u003c\/h2\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21 Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/cLZXN-22ToQPRSsziH882At4tMbmU8m8g_VkuEP2TCY.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21 Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31 Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/SITv1sqYJTD_5p71Au0BPbmur0mGCPGQqX8LEHOVsKI.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31 Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21 Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/5E_Cqq3RopAzls8aPoJmvHQMeuuRxjlrsjQeILwJrPw.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21 Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31 Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/QtetLpZzr0zryso8Up1OCpp-nxIUUER8nD1yW75h6Xg.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31 Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e","brand":"Kidde","offers":[{"title":"Default Title","offer_id":58118876660096,"sku":"KF21x5+KF31","price":144.08,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0553\/2349\/2557\/files\/KF21x5_KF31_Shopify.jpg?v=1779203402"},{"product_id":"kidde-sentry-1x-kf21r-optical-smoke-1x-kf31r-heat-alarm-kit-mains-ac-sealed-in-rechargeable-battery-back-up-c-w-quick-fit-base","title":"Kidde Sentry 1x KF21R Optical Smoke \u0026 1x KF31R Heat Alarm Kit Mains Powered with Sealed-In Rechargeable Battery Back-Up c\/w Quick Fit Base","description":"\u003ch1\u003eKidde Sentry KF21R \u0026amp; KF31R Mains Powered Smoke and Heat Alarm Kit with Rechargeable Lithium Battery Back-Up\u003c\/h1\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eKidde Sentry Alarm Kit\u003c\/strong\u003e combines the \u003cstrong\u003eKF21R Optical Smoke Alarm\u003c\/strong\u003e and \u003cstrong\u003eKF31R Heat Alarm\u003c\/strong\u003e to provide reliable, whole-home fire detection for residential properties. Designed for mains-powered installation, both alarms feature sealed rechargeable lithium battery back-up protection and can be interconnected with up to 23 compatible Kidde FIREX alarms.\u003c\/p\u003e\n\n\u003cp\u003eThis advanced fire alarm kit delivers dependable smoke and heat detection across living spaces, escape routes, kitchens, garages and lofts, helping homeowners meet UK Building Regulations while improving property safety.\u003c\/p\u003e\n\n\u003cp\u003eEach alarm is supplied with Kidde’s \u003cstrong\u003eQuick-Fit Slide-On Base\u003c\/strong\u003e for faster installation and features integrated cable management to keep wiring secure and organised. The 150mm flared base plate also provides a neat finish when retrofitting existing alarms.\u003c\/p\u003e\n\n\u003ch2\u003eKit Contents\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e1 x Kidde KF21R Optical Smoke Alarm\u003c\/li\u003e\n\u003cli\u003e1 x Kidde KF31R Heat Alarm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF21R Optical Smoke Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF21R optical smoke alarm is designed to detect slow, smouldering fires caused by electrical faults, upholstery or cigarettes. Ideal for hallways, bedrooms and living spaces, the optical sensor provides reliable early warning protection.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered optical smoke alarm with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003eOptical sensor with dust compensation and bug screen\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated alarm\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eSuitable for hallways, bedrooms, lofts and living rooms\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS EN14604:2005\u003c\/li\u003e\n\u003cli\u003e10-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF31R Heat Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF31R heat alarm is designed for kitchens, garages and loft spaces where smoke alarms may be unsuitable due to steam, cooking fumes or dust. Its thermistor heat sensor provides dependable heat detection while helping to reduce nuisance alarms.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered heat alarm with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003eThermistor heat sensor for reliable heat detection\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated alarm\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eIdeal for kitchens, garages and loft spaces\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS 5446 Part 2:2003\u003c\/li\u003e\n\u003cli\u003e10-year warranty including battery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKey Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eComplete smoke and heat alarm solution for residential properties\u003c\/li\u003e\n\u003cli\u003eSealed rechargeable lithium battery back-up for maintenance-free operation\u003c\/li\u003e\n\u003cli\u003eInterlinked alarms provide whole-home warning when danger is detected\u003c\/li\u003e\n\u003cli\u003eQuick-Fit bases for fast and simple installation\u003c\/li\u003e\n\u003cli\u003eIntegrated cable management for tidy wiring\u003c\/li\u003e\n\u003cli\u003eSuitable for compliance with UK Building Regulations\u003c\/li\u003e\n\u003cli\u003eGrade D1 domestic fire alarm system solution\u003c\/li\u003e\n\u003cli\u003eFully compatible with Kidde FIREX smoke, heat and CO alarms\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ch3\u003eKF21R Optical Smoke Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF21R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Optical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 150mm x 53mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 260g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKF31R Heat Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF31R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Thermistor heat sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 66mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 245g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years including battery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePlease Note:\u003c\/strong\u003e Alarms are supplied individually within the kit. Installation should be completed by a qualified electrician.\u003c\/p\u003e\n\n\u003ch2\u003eDownloads\u003c\/h2\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21R Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/N1qtN-KTPiGxV4FCNukEVy8KrHFuo3kFjmynmZb3DAM.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21R Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31R Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/xNd9FoIq-vcqzIQOFyRYOdCzaM-sDYjr6hjJWbs8s7w.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31R Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21R Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/5E_Cqq3RopAzls8aPoJmvHQMeuuRxjlrsjQeILwJrPw.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21R Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31R Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/QtetLpZzr0zryso8Up1OCpp-nxIUUER8nD1yW75h6Xg.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31R Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e","brand":"Kidde","offers":[{"title":"Default Title","offer_id":58118876791168,"sku":"KF21R+KF31R","price":102.88,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0553\/2349\/2557\/files\/KF21_KF31_Shopify.jpg?v=1779203402"},{"product_id":"kidde-sentry-2x-kf21r-optical-smoke-1x-kf31r-heat-alarm-kit-mains-ac-sealed-in-rechargeable-battery-back-up-c-w-quick-fit-base","title":"Kidde Sentry 2x KF21R Optical Smoke \u0026 1x KF31R Heat Alarm Kit Mains Powered with Sealed-In Rechargeable Battery Back-Up c\/w Quick Fit Base","description":"\u003ch1\u003eKidde Sentry 2x KF21R Optical Smoke \u0026amp; 1x KF31R Heat Alarm Kit with Rechargeable Lithium Battery Back-Up\u003c\/h1\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eKidde Sentry Alarm Kit\u003c\/strong\u003e combines \u003cstrong\u003etwo KF21R Optical Smoke Alarms\u003c\/strong\u003e and \u003cstrong\u003eone KF31R Heat Alarm\u003c\/strong\u003e to provide dependable whole-home fire detection for residential properties. Designed for mains-powered installation, each alarm features a sealed rechargeable lithium battery back-up and can be interconnected with up to 23 compatible Kidde FIREX alarms.\u003c\/p\u003e\n\n\u003cp\u003eThis advanced alarm system delivers reliable smoke and heat detection across hallways, bedrooms, living spaces, kitchens and loft areas, helping properties comply with UK Building Regulations while enhancing occupant safety.\u003c\/p\u003e\n\n\u003cp\u003eEach alarm is supplied with Kidde’s \u003cstrong\u003eQuick-Fit Slide-On Base\u003c\/strong\u003e for faster installation, while integrated cable management ensures neat and secure wiring. The 150mm flared base plate also provides a clean finish during retrofit installations.\u003c\/p\u003e\n\n\u003ch2\u003eKit Contents\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e2 x Kidde KF21R Optical Smoke Alarms\u003c\/li\u003e\n\u003cli\u003e1 x Kidde KF31R Heat Alarm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF21R Optical Smoke Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF21R optical smoke alarm is designed to detect slow, smouldering fires caused by electrical faults, furniture or cigarettes. Ideal for escape routes and living areas, the optical sensor provides dependable early warning protection.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered optical smoke alarm with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003eOptical sensor with dust compensation and bug screen\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated alarm\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eSuitable for hallways, bedrooms, lofts and living rooms\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS EN14604:2005\u003c\/li\u003e\n\u003cli\u003e10-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF31R Heat Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF31R heat alarm is designed for kitchens, garages and loft spaces where smoke alarms may be unsuitable due to cooking fumes, dust or steam. The thermistor heat sensor provides reliable heat detection while reducing nuisance alarms.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered heat alarm with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003eThermistor heat sensor for reliable heat detection\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated alarm\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eIdeal for kitchens, garages and loft spaces\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS 5446 Part 2:2003\u003c\/li\u003e\n\u003cli\u003e10-year warranty including battery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKey Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eComplete smoke and heat alarm system for residential properties\u003c\/li\u003e\n\u003cli\u003eSealed rechargeable lithium battery back-up for maintenance-free protection\u003c\/li\u003e\n\u003cli\u003eInterlinked alarms provide whole-home warning when danger is detected\u003c\/li\u003e\n\u003cli\u003eQuick-Fit bases for fast and efficient installation\u003c\/li\u003e\n\u003cli\u003eIntegrated cable management for neat wiring\u003c\/li\u003e\n\u003cli\u003eSuitable for compliance with UK Building Regulations\u003c\/li\u003e\n\u003cli\u003eGrade D1 domestic fire alarm system solution\u003c\/li\u003e\n\u003cli\u003eFully compatible with Kidde FIREX smoke, heat and CO alarms\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ch3\u003eKF21R Optical Smoke Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF21R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Optical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 150mm x 53mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 260g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKF31R Heat Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF31R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Thermistor heat sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 66mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 245g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years including battery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePlease Note:\u003c\/strong\u003e Alarms are supplied individually within the kit. Installation should be carried out by a qualified electrician.\u003c\/p\u003e\n\n\u003ch2\u003eDownloads\u003c\/h2\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21R Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/N1qtN-KTPiGxV4FCNukEVy8KrHFuo3kFjmynmZb3DAM.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21R Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31R Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/xNd9FoIq-vcqzIQOFyRYOdCzaM-sDYjr6hjJWbs8s7w.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31R Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21R Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/5E_Cqq3RopAzls8aPoJmvHQMeuuRxjlrsjQeILwJrPw.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21R Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31R Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/QtetLpZzr0zryso8Up1OCpp-nxIUUER8nD1yW75h6Xg.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31R Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e","brand":"Kidde","offers":[{"title":"Default Title","offer_id":58118876922240,"sku":"KF21Rx2+KF31R","price":152.21,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0553\/2349\/2557\/files\/KF21x2_KF31_Shopify.jpg?v=1779203402"},{"product_id":"kidde-sentry-3x-kf21r-optical-smoke-1x-kf31r-heat-alarm-kit-mains-ac-sealed-in-rechargeable-battery-back-up-c-w-quick-fit-base","title":"Kidde Sentry 3x KF21R Optical Smoke \u0026 1x KF31R Heat Alarm Kit Mains Powered with Sealed-In Rechargeable Battery Back-Up c\/w Quick Fit Base","description":"\u003ch1\u003eKidde Sentry 3x KF21R Optical Smoke \u0026amp; 1x KF31R Heat Alarm Kit with Rechargeable Lithium Battery Back-Up\u003c\/h1\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eKidde Sentry Alarm Kit\u003c\/strong\u003e includes \u003cstrong\u003ethree KF21R Optical Smoke Alarms\u003c\/strong\u003e and \u003cstrong\u003eone KF31R Heat Alarm\u003c\/strong\u003e, providing reliable whole-home fire detection for residential properties. Designed for mains-powered installation, each alarm features a sealed rechargeable lithium battery back-up and can be interconnected with up to 23 compatible Kidde FIREX alarms.\u003c\/p\u003e\n\n\u003cp\u003eThis advanced fire alarm system is ideal for larger homes, delivering dependable smoke detection in hallways, bedrooms and living areas, alongside dedicated heat detection for kitchens, garages and loft spaces.\u003c\/p\u003e\n\n\u003cp\u003eEach alarm is supplied with Kidde’s \u003cstrong\u003eQuick-Fit Slide-On Base\u003c\/strong\u003e for faster installation and features integrated cable management to keep wiring tidy and secure. The 150mm flared base plate also provides a neat retrofit finish when replacing older alarms.\u003c\/p\u003e\n\n\u003ch2\u003eKit Contents\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e3 x Kidde KF21R Optical Smoke Alarms\u003c\/li\u003e\n\u003cli\u003e1 x Kidde KF31R Heat Alarm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF21R Optical Smoke Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF21R optical smoke alarm is designed to detect slow, smouldering fires caused by electrical faults, upholstered furniture or cigarettes. Ideal for circulation routes and living spaces, the optical sensor delivers dependable early warning protection.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered optical smoke alarm with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003eOptical sensor with dust compensation and bug screen\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated alarm\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eSuitable for hallways, bedrooms, lofts and living rooms\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS EN14604:2005\u003c\/li\u003e\n\u003cli\u003e10-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF31R Heat Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF31R heat alarm is designed for kitchens, garages and loft spaces where smoke alarms may be unsuitable due to steam, cooking fumes or airborne dust. The thermistor heat sensor provides reliable heat detection while helping minimise nuisance alarms.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered heat alarm with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003eThermistor heat sensor for reliable heat detection\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated alarm\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eIdeal for kitchens, garages and loft spaces\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS 5446 Part 2:2003\u003c\/li\u003e\n\u003cli\u003e10-year warranty including battery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKey Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eComplete smoke and heat alarm solution for larger residential properties\u003c\/li\u003e\n\u003cli\u003eSealed rechargeable lithium battery back-up for maintenance-free operation\u003c\/li\u003e\n\u003cli\u003eInterlinked alarms provide whole-home warning when danger is detected\u003c\/li\u003e\n\u003cli\u003eQuick-Fit bases for fast and efficient installation\u003c\/li\u003e\n\u003cli\u003eIntegrated cable management for organised wiring\u003c\/li\u003e\n\u003cli\u003eSuitable for compliance with UK Building Regulations\u003c\/li\u003e\n\u003cli\u003eGrade D1 domestic fire alarm system solution\u003c\/li\u003e\n\u003cli\u003eFully compatible with Kidde FIREX smoke, heat and CO alarms\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ch3\u003eKF21R Optical Smoke Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF21R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Optical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 150mm x 53mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 260g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKF31R Heat Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF31R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Thermistor heat sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 66mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 245g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years including battery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePlease Note:\u003c\/strong\u003e Alarms are supplied individually within the kit. Installation should be completed by a qualified electrician.\u003c\/p\u003e\n\n\u003ch2\u003eDownloads\u003c\/h2\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21R Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/N1qtN-KTPiGxV4FCNukEVy8KrHFuo3kFjmynmZb3DAM.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21R Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31R Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/xNd9FoIq-vcqzIQOFyRYOdCzaM-sDYjr6hjJWbs8s7w.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31R Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21R Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/5E_Cqq3RopAzls8aPoJmvHQMeuuRxjlrsjQeILwJrPw.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21R Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31R Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/QtetLpZzr0zryso8Up1OCpp-nxIUUER8nD1yW75h6Xg.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31R Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e","brand":"Kidde","offers":[{"title":"Default Title","offer_id":58118877053312,"sku":"KF21Rx3+KF31R","price":201.54,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0553\/2349\/2557\/files\/KF21x3_KF31_Shopify.jpg?v=1779203403"},{"product_id":"kidde-sentry-4x-kf21r-optical-smoke-1x-kf31r-heat-alarm-kit-mains-ac-sealed-in-rechargeable-battery-back-up-c-w-quick-fit-base","title":"Kidde Sentry 4x KF21R Optical Smoke \u0026 1x KF31R Heat Alarm Kit Mains Powered with Sealed-In Rechargeable Battery Back-Up c\/w Quick Fit Base","description":"\u003ch1\u003eKidde Sentry 4x KF21R Optical Smoke \u0026amp; KF31R Heat Alarm Kit with Rechargeable Lithium Battery Back-Up\u003c\/h1\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eKidde Sentry Alarm Kit\u003c\/strong\u003e includes \u003cstrong\u003efour KF21R Optical Smoke Alarms\u003c\/strong\u003e and \u003cstrong\u003eone KF31R Heat Alarm\u003c\/strong\u003e, providing a complete fire detection solution for larger homes and multi-storey residential properties. Designed for mains-powered installation, each alarm features a sealed rechargeable lithium battery back-up and can be interconnected with up to 23 compatible Kidde FIREX alarms.\u003c\/p\u003e\n\n\u003cp\u003eWhen one alarm detects danger, all connected alarms sound simultaneously, helping to provide an early warning throughout the property. This makes the system ideal for improving fire safety across multiple rooms, hallways, landings and escape routes.\u003c\/p\u003e\n\n\u003cp\u003eEach alarm is supplied with Kidde’s \u003cstrong\u003eQuick-Fit Slide-On Base\u003c\/strong\u003e for fast installation and features integrated cable management to keep wiring secure and organised. The 150mm flared base plate also provides a neat retrofit finish when replacing older alarms.\u003c\/p\u003e\n\n\u003ch2\u003eKit Contents\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e4 x Kidde KF21R Optical Smoke Alarms\u003c\/li\u003e\n\u003cli\u003e1 x Kidde KF31R Heat Alarm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF21R Optical Smoke Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF21R optical smoke alarm is designed to detect slow, smouldering fires caused by electrical faults, furniture or cigarettes. Ideal for circulation routes and living areas, the optical sensor provides dependable early warning protection.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered optical smoke alarm with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003eOptical sensor with dust compensation and bug screen\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated alarm\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eSuitable for hallways, bedrooms, lofts and living rooms\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS EN14604:2005\u003c\/li\u003e\n\u003cli\u003e10-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF31R Heat Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF31R heat alarm is ideal for kitchens, garages and loft spaces where smoke alarms may be unsuitable due to cooking fumes, steam or airborne dust. The thermistor heat sensor delivers reliable heat detection while helping reduce nuisance alarms.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered heat alarm with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003eThermistor heat sensor for dependable heat detection\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated alarm\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eIdeal for kitchens, garages and loft spaces\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS 5446 Part 2:2003\u003c\/li\u003e\n\u003cli\u003e10-year warranty including battery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKey Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eComplete smoke and heat alarm solution for larger homes\u003c\/li\u003e\n\u003cli\u003eSealed rechargeable lithium battery back-up for maintenance-free operation\u003c\/li\u003e\n\u003cli\u003eInterlinked alarms provide whole-home warning when danger is detected\u003c\/li\u003e\n\u003cli\u003eQuick-Fit bases for fast and efficient installation\u003c\/li\u003e\n\u003cli\u003eIntegrated cable management for neat wiring\u003c\/li\u003e\n\u003cli\u003eSuitable for compliance with UK Building Regulations\u003c\/li\u003e\n\u003cli\u003eGrade D1 domestic fire alarm system solution\u003c\/li\u003e\n\u003cli\u003eFully compatible with Kidde FIREX smoke, heat and CO alarms\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ch3\u003eKF21R Optical Smoke Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF21R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Optical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 150mm x 53mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 260g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKF31R Heat Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF31R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Thermistor heat sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 66mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 245g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years including battery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePlease Note:\u003c\/strong\u003e Alarms are supplied individually within the kit. Installation should be completed by a qualified electrician.\u003c\/p\u003e\n\n\u003ch2\u003eDownloads\u003c\/h2\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21R Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/N1qtN-KTPiGxV4FCNukEVy8KrHFuo3kFjmynmZb3DAM.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21R Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31R Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/xNd9FoIq-vcqzIQOFyRYOdCzaM-sDYjr6hjJWbs8s7w.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31R Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21R Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/5E_Cqq3RopAzls8aPoJmvHQMeuuRxjlrsjQeILwJrPw.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21R Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31R Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/QtetLpZzr0zryso8Up1OCpp-nxIUUER8nD1yW75h6Xg.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31R Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e","brand":"Kidde","offers":[{"title":"Default Title","offer_id":58118877184384,"sku":"KF21Rx4+KF31R","price":250.87,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0553\/2349\/2557\/files\/KF21x4_KF31_Shopify.jpg?v=1779203403"},{"product_id":"kidde-sentry-5x-kf21r-optical-smoke-1x-kf31r-heat-alarm-kit-mains-ac-sealed-in-rechargeable-battery-back-up-c-w-quick-fit-base","title":"Kidde Sentry 5x KF21R Optical Smoke \u0026 1x KF31R Heat Alarm Kit Mains Powered with Sealed-In Rechargeable Battery Back-Up c\/w Quick Fit Base","description":"\u003ch1\u003eKidde Sentry 5x KF21R Optical Smoke \u0026amp; KF31R Heat Alarm Kit with Rechargeable Lithium Battery Back-Up\u003c\/h1\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eKidde Sentry Alarm Kit\u003c\/strong\u003e includes \u003cstrong\u003efive KF21R Optical Smoke Alarms\u003c\/strong\u003e and \u003cstrong\u003eone KF31R Heat Alarm\u003c\/strong\u003e, providing a complete fire detection solution for larger homes and multi-storey residential properties. Designed for mains-powered installation, each alarm features a sealed rechargeable lithium battery back-up and can be interconnected with up to 23 compatible Kidde FIREX alarms.\u003c\/p\u003e\n\n\u003cp\u003eWhen one alarm detects danger, all connected alarms sound simultaneously, helping to provide early warning throughout the property. This makes the system ideal for improving fire safety across multiple rooms, floors and escape routes.\u003c\/p\u003e\n\n\u003cp\u003eEach alarm is supplied with Kidde’s \u003cstrong\u003eQuick-Fit Slide-On Base\u003c\/strong\u003e for fast installation and includes integrated cable management to keep wiring tidy and secure. The 150mm flared base plate also provides a clean retrofit finish when replacing existing alarms.\u003c\/p\u003e\n\n\u003ch2\u003eKit Contents\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e5 x Kidde KF21R Optical Smoke Alarms\u003c\/li\u003e\n\u003cli\u003e1 x Kidde KF31R Heat Alarm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF21R Optical Smoke Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF21R optical smoke alarm is designed to detect slow, smouldering fires caused by electrical faults, furniture or cigarettes. Ideal for hallways, bedrooms, lofts and living areas, the optical sensor provides reliable early warning protection.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered optical smoke alarm with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003eOptical sensor with dust compensation and bug screen\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated alarm\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eSuitable for hallways, bedrooms, lofts and living rooms\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS EN14604:2005\u003c\/li\u003e\n\u003cli\u003e10-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKF31R Heat Alarm Features\u003c\/h2\u003e\n\n\u003cp\u003eThe Kidde KF31R heat alarm is designed for kitchens, garages and loft spaces where smoke alarms may be unsuitable due to steam, cooking fumes or dust. The thermistor heat sensor provides dependable heat detection while helping minimise nuisance alarms.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMains-powered heat alarm with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003eThermistor heat sensor for reliable heat detection\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the activated alarm\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button\u003c\/li\u003e\n\u003cli\u003eAuto reset after activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eIdeal for kitchens, garages and loft spaces\u003c\/li\u003e\n\u003cli\u003eBSI certified to BS 5446 Part 2:2003\u003c\/li\u003e\n\u003cli\u003e10-year warranty including battery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKey Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eComplete smoke and heat alarm solution for larger residential properties\u003c\/li\u003e\n\u003cli\u003eSealed rechargeable lithium battery back-up for maintenance-free operation\u003c\/li\u003e\n\u003cli\u003eInterlinked alarms provide whole-home warning when danger is detected\u003c\/li\u003e\n\u003cli\u003eQuick-Fit bases for fast and efficient installation\u003c\/li\u003e\n\u003cli\u003eIntegrated cable management for organised wiring\u003c\/li\u003e\n\u003cli\u003eSuitable for compliance with UK Building Regulations\u003c\/li\u003e\n\u003cli\u003eGrade D1 domestic fire alarm system solution\u003c\/li\u003e\n\u003cli\u003eFully compatible with Kidde FIREX smoke, heat and CO alarms\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ch3\u003eKF21R Optical Smoke Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF21R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Optical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 150mm x 53mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 260g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKF31R Heat Alarm\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF31R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with sealed rechargeable lithium battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Thermistor heat sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e 85dB minimum at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 66mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 245g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years including battery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePlease Note:\u003c\/strong\u003e Alarms are supplied individually within the kit. Installation should be completed by a qualified electrician.\u003c\/p\u003e\n\n\u003ch2\u003eDownloads\u003c\/h2\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21R Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/N1qtN-KTPiGxV4FCNukEVy8KrHFuo3kFjmynmZb3DAM.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21R Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31R Data Sheet:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/xNd9FoIq-vcqzIQOFyRYOdCzaM-sDYjr6hjJWbs8s7w.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31R Data Sheet\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF21R Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/5E_Cqq3RopAzls8aPoJmvHQMeuuRxjlrsjQeILwJrPw.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF21R Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eKF31R Instruction Manual:\u003c\/strong\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/QtetLpZzr0zryso8Up1OCpp-nxIUUER8nD1yW75h6Xg.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload KF31R Instruction Manual\u003c\/a\u003e\n\u003c\/p\u003e","brand":"Kidde","offers":[{"title":"Default Title","offer_id":58118877348224,"sku":"KF21Rx5+KF31R","price":300.2,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0553\/2349\/2557\/files\/KF21x5_KF31_Shopify.jpg?v=1779203402"}],"url":"https:\/\/westbasedirect.com\/collections\/kidde-sentry-mains-smoke-heat-detectors\/manufacturer_kidde.oembed","provider":"westbasedirect.com","version":"1.0","type":"link"}