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The First Alert HD6135FB Hardwired Heat Alarm with Battery Backup enhances your home's fire safety by accurately detecting high temperatures and rapidly rising temperatures. Easy to install on a wall or ceiling, this heat detector is ideal for use in crawl spaces, laundry rooms, garages, kitchens, and other areas where smoke alarms aren't an option. It comes equipped with advanced rate-of-rise sensing technology and a microprocessor that dramatically reduces the number of false alarms. If the temperature reaches 135 degrees Fahrenheit or rises more than 15 degrees Fahrenheit in one minute, the alarm alerts you to the danger with a loud 85-decibel siren. Designed to be wired directly into your home's electrical system, this 120-volt AC hardwired temperature sensor features a 9-volt backup battery that helps keep the alarm functioning even in the event of a power outage. An intuitive mounting bracket makes installation hassle-free, while an easy-to-access battery drawer allows you to quickly change the battery. The alarm can be configured to work with almost any standard household remote control (sold separately), so you can remotely silence nuisance alarms with the push of a button. And thanks to the convenient test/silence button, it is easy to check alarm function and mute false alarms. This heat alarm can integrate with up to 12 other First Alert or BRK hardwired alarms and up to 6 other compatible devices. It features a latching indicator that identifies which unit triggered the alarm.
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The BRK hardwire heat alarm is ideal for use in attached garages and other locations where standard smoke alarms are not suitable. The unit alarms if either the temperature reaches 135 degrees Fahrenheit or the temperature rises more than 15 degrees Fahrenheit in one minute.
The HD6135FB hardwire heat alarm includes these features:
- 120-volt AC/DC with 9-volt battery backup
- 135 degrees Fahrenheit fixed rate and rate-of-rise temperature sensing
- Microprocessor controlled for fewer nuisance alarms
- The test/silence button both silences a non-threatening alarm or low battery warning and allows you to test the unit's functionality. Silencing and testing functions can be run by most household remote controls such as the ones used for the television, stereo, and VHS or DVD players.
- Latching alarm indicator which automatically identifies which unit initiated the alarm.
- 120-volt AC inter-connectable (with maximum 18 compatible devices). The alarm can be interconnected with up to 12 other compatible smoke alarms and six compatible devices like bells, horns, repeaters and door closers. If one unit triggers an alarm, all smoke alarms in the series will sound. Power indicators show which unit in the series initiated the alarm.
- 85-decibel horn.
- Meets UL requirements.
- 10-year limited warranty. --Bree Norlander
What's in the Box
One heat alarm, one 9-volt battery, and user's manual
M. J. Mccaffrey
2025-09-03 13:33:46
Smoke and CO alarms are essential for most spaces in a residential structure. They are not appropriate in areas where smoke, high humidity, airborne particles, or trace amounts of carbon monoxide are considered normal. This includes furnace rooms, laundry rooms with gas-fired dryers, and similar rooms.The HD6135FB heat alarm is the right device for these areas. It is similar in appearance to the BRK smokes and smoke/COs that are part of my installation, and interconnects seamlessly with them.For new construction or renovation, installation is as close to turnkey as it gets. Install a dedicated 3-wire circuit that hits all of your alarm locations. (The third wire, usually red, is a signaling trunk for the alarms. It must not be connected to current.) Install a ceiling work box at each location. A separate plastic mounting ring is attached to the ceiling box with the included screws. Connections are made to a pigtail connector: black to black, white to white, and red to orange (which needs to be stripped). No ground. Attach the connector to the alarm, and rotate onto the mounting ring. Pull the plastic battery disabling strip from its slot, and your installation is complete.This device includes an infrared remote sensing module, which responds to just about any button press from most consumer electronics remote controls. In my tests, it did not work with my Onkyo receiver's remote, but responded just fine to VOL or CHANNEL presses from my TiVo remote. This is a clever and insightful application of what amounts to "spare parts." I would guess that many people have remotes to products that they no longer use. Throwing in a couple of batteries and leaving this near the alarm is a great reuse of an otherwise-useless device.This alarm is designed to sense temperature rises, and will thus work well in locations that are inherently high-temperature, such as a furnace room. For obvious reasons I don't plan to test it with live flames, but will need to trust the manufacturer and Underwriters Labs on this one. The horn is loud, though this is not relevant in my application because an interconnected smoke in my bedroom will also sound if the alarm is triggered. The interconnect system works as designed, and the latching feature (a red light continues to blink after the alarm condition goes away, so you know which one tripped the system) is useful.I recommend this unit as part of a larger system.
North Shore
2025-08-28 16:41:55
When our home was built the electrician put a standard smoke detector in the attached garage, connected to the whole house system. That's not appropriate due to dust and temperature changes causing false alarms. We'd pulled it out YEARS ago. This heat detector easily replaced the smoke detector and integrates into the system with the smoke/CO detectors in the living space. Good price, easy install, and the right product for the application. Thankfully, no fires yet to test the function.
CheekyMonkey
2025-07-20 11:33:51
I rated this as 'easy to install' , but to be fair, I hired an electrician to do it properly for us. He did say it was an easy install, though. What I like best is that he wired it to connect to our indoor smoke alarms. This way, if a fire starts in the garage, sets off the heat detector, and we do not hear it while we are at the other end of our home, it will also sound every smoke alarm in the house so we cannot miss the warning. I bought this one purposely as it is the same brand as our smoke detectors. When testing the system, it is LOUD and works perfectly.
Elizabeth L
2025-06-03 10:50:05
These work as advertised and have helped my problem with the smoke detector in my kitchen going off constantly. I replaced it with this heat detector and the problem of the smoke detectors going off every time I cook has gone away.However, the heat detector started chirping saying the battery was dying after only a couple of months. Very frustrating to have to change the battery on a device so soon after getting it. I docked a star on my rating because of the short battery life. Otherwise pleased with my purchase.
JBronc
2025-04-02 18:21:57
Bought because the originals were approaching their expiration date. I wanted the voice to ID the units and their rooms they covered. There are cheaper units out there, but according to multiple ratings, they do not stack up as far as reliability. This is one product I’m not willing to compromise by buying a cheaper less proven manufacturer.
CDCSK
2025-02-16 17:48:02
After many false alarms... I finally replaced my garage smoke alarms with these heat alarms. I still get the piece of mind that there is a fire sensor in the garage, without having the whole house sound off when a car idles too long in the garage.
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