--- product_id: 5594335 title: "Heat Detector, Hardwired with Battery Backup & 2 LEDs, Interconnect Capability, Ideal for Garages" brand: "kidde" price: "Β£47.38" currency: GBP in_stock: true reviews_count: 13 category: "Kidde" url: https://www.desertcart.co.uk/products/5594335-heat-detector-hardwired-with-battery-backup-and-2-leds-interconnect store_origin: GB region: United Kingdom --- # 9V battery backup Interconnect up to 24 devices 135Β°F heat trigger Heat Detector, Hardwired with Battery Backup & 2 LEDs, Interconnect Capability, Ideal for Garages **Brand:** kidde **Price:** Β£47.38 **Availability:** βœ… In Stock ## Summary > πŸ”₯ Stay ahead of heat hazards β€” because your home deserves smarter safety! ## Quick Answers - **What is this?** Heat Detector, Hardwired with Battery Backup & 2 LEDs, Interconnect Capability, Ideal for Garages by kidde - **How much does it cost?** Β£47.38 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/5594335-heat-detector-hardwired-with-battery-backup-and-2-leds-interconnect) ## Best For - kidde enthusiasts ## Why This Product - Trusted kidde brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Seamless Integration:** Connects up to 24 Kidde devices for whole-home safety network - β€’ **Precision Heat Sensing:** Detects dangerous temps above 135Β°F for targeted fire alerts - β€’ **Uninterrupted Protection:** Hardwired 120V power with 9V battery backup ensures constant readiness - β€’ **Smart False Alarm Control:** Test-Hush button silences nuisance alerts from cooking or steam - β€’ **Clear Visual & Audible Alerts:** 85dB alarm with dual LEDs for instant status and emergency notification ## Overview The Kidde HD135F Heat Detector is a hardwired, 120V-powered heat alarm with a 9V battery backup that activates at temperatures above 135Β°F. Designed for areas prone to false smoke alarms like garages and kitchens, it features an 85-decibel alarm, dual LED indicators, and a Test-Hush button for easy maintenance. Interconnectable with up to 24 Kidde devices, it creates a comprehensive safety network, backed by UL certification and a 5-year warranty. ## Description Product Description The Kidde Heat Detector, Hardwired with Battery Backup & 2 LEDs, Interconnectable, model HD135F, is an AC/DC powered heat alarm that operates on your home's 120V power source. In the event of a power failure, the Kidde heat alarm comes equipped with a 9-Volt battery backup (included). Using heat sensing technology, the wired heat alarm detects temperatures rising above 135⁰ Fahrenheit, alerting homeowners to dangerous temperatures unlike a smoke alarm, which only detects smoke. Heat detectors are recommended for areas where a smoke alarm may not be appropriate, such as in a kitchen, garage, attic, or other area where smoke or dust may set off a false alarm on a smoke detector. Installing both smoke and heat detectors in a home can provide extra protection while triggering fewer nuisance alerts. The heat alarm includes a quick-connect power harness to make installation fast and easy. An 85-decibel alarm sounds when the high temp sensor detects elevated heat conditions. Two LEDs indicate the heat sensor alarm's status: a green LED is constantly 'on' when AC power is present, and a red LED will flash every 30-40 seconds to indicate that the heat alarm is operating properly; the red LED and will flash rapidly when the unit is sounding until air temperature is reduced. The Kidde heat detector can be used as a single unit or interconnected with up to 24 Kidde devices (18 of which can be initiating) in a multiple-station arrangement, not exceeding the NFPA (National Fire Protection Association) limit of 18 initiating devices (smoke, heat, CO). It is possible to interconnect 6 strobe lights and or relay modules. Ideal for garages. UL Certified with a 5-year limited warranty. From the Manufacturer The Kidde 120-Volt AC Hardwire Heat Alarm gives you and your family an early warning to dangerous temperatures of 135-Degree F or more. This unit can be used as a single station unit or it can be interconnected to up to 24 Kidde devices in a multiple station arrangement. The interconnect system should not exceed the NFPA interconnect limit of 12 smoke alarms and or 18 initiation alarms. The heat detector includes a tamper resist pin to help deter tampering or theft. Review: At Least it Doesn't Randomly Go Off - Hard to judge a product that has never encountered the situation it was designed for but I can tell you what it does right. This alarm does not go off randomly like our hard-wired Kidde system did. The interconnected five unit Kidde system installed two years ago by our contractor has been nothing but problems. The main unit would go off which, by design, would trigger the other four. I replaced the batteries with 10 year lithium so it was not the batteries. I tried turning the power off the units with no effect. Running a huge floor fan pointed directly at the main unit helped. Finally, we removed the main unit and installed this one. False alarms stopped. Review: If you have a commercial stove, this is for you - Most houses when they are built are usually fitted with the absolute minimum required photo sensitive fire detectors. Newer houses also have a carbon monoxide detector built in, which has a limited life and has to be replaced more often. For the kitchen or kitchen living space, if you have a gas stove or you bake foods using high heat a lot, chances are you'll get some smoke. The single photo sensitive detectors will often go off with false positives When I spoke to Kiddie, they recommend this detector for spaces where by-products of gas cooking or high heat cooking smoke will set off a standard detector. For me, I have a Thermador 6 burner pro range and even with a 1200 cfm hood, I got a lot of smoke detector false positives. I swapped out the original Kiddie for this one and it is plug and play. I did not have to wire. I just unplugged the old and plugged in the new. Depending on the original detector, you might also have to swap out the base plate. I just loosened the screws on the electrical box, twisted off the old and then reversed the process. All up, the work required was about 10 minutes and I now have a smoke detector (actually it detects high heat over smoke) that does not go off every other day. I additionally installed a plug in carbon monoxide detector, so that I don't have to replace my smoke (heat) detector every 10 years. ## Features - Heat detector alerts to temperatures rising above 135⁰ Fahrenheit & sounds an 85-decibel alarm to help protect your family - Heat alarm operates on a 120V wired power source with a 9-Volt alkaline battery backup - Quick-connect power harness makes installation fast and easy - An 85-decibel alarm sounds & a red LED indicates the smoke detector is sensing smoke or fire - Test-Hush Button makes testing the detector or silencing false alarms easy (false alarms may occur from routine cooking, shower steam, dust or humidity) - Interconnection capability: allows you to connect up to 18 Kidde smoke, heat, or CO alarms, with the possibly it interconnect 6 strobe lights or relay modules - UL Certified, 5-year limited manufacturer warranty ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000P4YY8K | | Alarm | Audible | | Best Sellers Rank | #20,401 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #37 in Smoke Detectors & Fire Alarms | | Brand | Kidde | | Built-In Media | User manual | | Color | White | | Compatible Devices | Up to 24 Kidde devices of which 18 can be initiating devices | | Customer Reviews | 4.6 out of 5 stars 1,077 Reviews | | Enclosure Material | Plastic | | Global Trade Identification Number | 00025417841350 | | Item Dimensions D x W x H | 4"D x 4"W x 2"H | | Item Type Name | Kidde Heat Detector, Hardwired with Battery Backup & 2 LEDs, Interconnect Capability, Ideal for Garages | | Item Weight | 295 Grams | | Manufacturer | Kidde Safety | | Manufacturer Warranty Description | Warranty | | Mfr Part Number | HD135F | | Model Number | HD135F | | Number of Items | 1 | | Operating Humidity | 85 percent | | Power Source | electric_corded | | Product Dimensions | 4"D x 4"W x 2"H | | Product Style | Hardwired Heat Detector | | Style | Hardwired Heat Detector | | UPC | 025417841350 | | Unit Count | 1.0 Count | | Upper Temperature Rating | 135 Degrees Celsius | ## Product Details - **Alarm:** Audible - **Brand:** Kidde - **Color:** White - **Compatible Devices:** Up to 24 Kidde devices of which 18 can be initiating devices - **Item Weight:** 295 Grams - **Operating Humidity:** 85 percent - **Power Source:** Battery Powered - **Product Dimensions:** 4"D x 4"W x 2"H - **Style:** Hardwired Heat Detector - **Upper Temperature Rating:** 135 Degrees Celsius ## Images ![Heat Detector, Hardwired with Battery Backup & 2 LEDs, Interconnect Capability, Ideal for Garages - Image 1](https://m.media-amazon.com/images/I/61yRMzm7KbL.jpg) ## Available Options This product comes in different **Edition** options. ## Questions & Answers **Q: Does the Kidde Hardwired Heat Detector operate in below zero temperatures?** A: Yes, the detector has an operating range of -20F to +100F (-29C and +38C ). **Q: Does this Kidde Hardwired Heat Detector interconnect with other alarms?** A: Yes, the Kidde Hardwired Heat Detector can interconnect with up to 24 detectors, they must be Kidde detectors with AC interconnect. **Q: Does the Kidde Hardwired Heat Detector alert to slow rising temperatures or only to rapid rising temperatures?** A: The HD135F is a fixed temperature alarm and will activate at 1350F with tolerance. It does not have a rate of rise feature. **Q: Does the Kidde Hardwired Heat Detector have to be hardwired or can you just use the battery?** A: Yes. The Kidde Hardwired Heat Detector is a hardwired product and should be connected as such in order to function properly. **Q: Is this Kidde Hardwired Heat Detector UL certified?** A: Yes. The Kidde Hardwired Heat Detector has passed strict testing to meet UL 539 standards. ## Customer Reviews ### ⭐⭐⭐⭐⭐ At Least it Doesn't Randomly Go Off *by C***R on April 6, 2026* Hard to judge a product that has never encountered the situation it was designed for but I can tell you what it does right. This alarm does not go off randomly like our hard-wired Kidde system did. The interconnected five unit Kidde system installed two years ago by our contractor has been nothing but problems. The main unit would go off which, by design, would trigger the other four. I replaced the batteries with 10 year lithium so it was not the batteries. I tried turning the power off the units with no effect. Running a huge floor fan pointed directly at the main unit helped. Finally, we removed the main unit and installed this one. False alarms stopped. ### ⭐⭐⭐⭐⭐ If you have a commercial stove, this is for you *by B***Y on December 4, 2020* Most houses when they are built are usually fitted with the absolute minimum required photo sensitive fire detectors. Newer houses also have a carbon monoxide detector built in, which has a limited life and has to be replaced more often. For the kitchen or kitchen living space, if you have a gas stove or you bake foods using high heat a lot, chances are you'll get some smoke. The single photo sensitive detectors will often go off with false positives When I spoke to Kiddie, they recommend this detector for spaces where by-products of gas cooking or high heat cooking smoke will set off a standard detector. For me, I have a Thermador 6 burner pro range and even with a 1200 cfm hood, I got a lot of smoke detector false positives. I swapped out the original Kiddie for this one and it is plug and play. I did not have to wire. I just unplugged the old and plugged in the new. Depending on the original detector, you might also have to swap out the base plate. I just loosened the screws on the electrical box, twisted off the old and then reversed the process. All up, the work required was about 10 minutes and I now have a smoke detector (actually it detects high heat over smoke) that does not go off every other day. I additionally installed a plug in carbon monoxide detector, so that I don't have to replace my smoke (heat) detector every 10 years. ### ⭐⭐⭐⭐⭐ Works great *by B***N on February 17, 2026* Fits perfectly with the Kidde smoke detector wire harness. Used this to replace the smoke detector closest to the kitchen. Rest of the house is still smoke detectors, but the dog is happy the detector isn’t going off every time we cook something. ## Frequently Bought Together - Kidde Heat Detector, Hardwired with Battery Backup & 2 LEDs, Interconnect Capability, Ideal for Garages - Kidde Hardwired Smoke Detector, 10-Year Battery Backup, Interconnectable, LED Warning Light Indicators, 4 Pack - Kidde Hardwired Smoke & Carbon Monoxide Detector, 10-Year Battery Backup, Voice Alerts, Interconnectable LED Warning Light Indicators --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/5594335-heat-detector-hardwired-with-battery-backup-and-2-leds-interconnect](https://www.desertcart.co.uk/products/5594335-heat-detector-hardwired-with-battery-backup-and-2-leds-interconnect) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-10*