Kidde HD135F Hardwired Heat Detector
- 135 F trigger, 85-decibel alarm
- 120V hardwired, 9-Volt battery backup included
- Up to 18 Kidde smoke, heat or CO alarms interconnected, plus 6 strobes or relays
- Quick-connect power harness for installation
- Green and red LEDs, red flashes every 30-40 seconds when normal
- UL Certified, 5-year limited warranty
- 4 x 4 x 2 inches, tamper resist pin
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A sensible heat alarm for garages, attics and kitchens where a smoke alarm would false-trigger, and it links into a Kidde alarm network. It senses heat only, so it does not replace smoke alarms elsewhere.
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ASIN: B000P4YY8KModel: HD135FCategory: Smoke Detectors & Fire Alarms
Overview
Watching for heat instead of smoke, the Kidde heat detector sounds when air temperature climbs past its fixed trigger point. It wires into household power with a battery backup and plugs in through a quick-connect harness.
Fewer nuisance alarms is the point: dust, steam and cooking smoke that set off smoke alarms do not trip a heat sensor. The trade in coverage is real, since a smoldering fire can grow before the room gets hot enough to trigger it.
Who it's for
Homes with an attached garage, a dusty attic or a busy kitchen get fire warning without the false alarms. Sleeping areas still need smoke alarms, because heat sensing reacts later to a slow fire.
Pros and cons
- Ignores dust, steam and cooking smoke
- Links with Kidde smoke and CO alarms
- Battery backup during power cuts
- Quick-connect harness speeds wiring
- Heat only, no smoke sensing
- Needs existing 120V wiring
- Kidde devices only for interconnect
Performance notes
Detection depends on the room reaching the fixed temperature, so response time tracks how fast heat builds near the ceiling. Interconnection carries the alarm to every linked Kidde unit, and the status LEDs show whether mains power is present and the unit is working.
Specifications
| Brand | Kidde |
|---|---|
| Model | HD135F |
| Dimensions & fit | |
| Item Dimensions D X W X H | 4 x 4 x 2 inches |
| Item weight | 295 g |
| Capacity & performance | |
| Upper Temperature Rating | 135 F |
| Power & efficiency | |
| Power Source | 120V AC, 9-Volt alkaline battery backup |
| Construction & materials | |
| Enclosure Material | Plastic |
| Color | White |
| Compatibility & installation | |
| Compatible Devices | Up to 24 Kidde devices, 18 initiating |
| Installation | Quick-connect power harness |
| Included components | |
| Unit Count | 1 Count |
| Warranty & support | |
| Manufacturer Warranty Description | 5-year limited |
| Other details | |
| Sensor Type | Fixed temperature heat sensor |
| Alarm | 85 decibels, audible |
| Operating Humidity | 85 percent |
| Interconnection | Up to 18 Kidde smoke, heat or CO alarms; 6 strobe lights or relay modules |
| Indicators | Green LED for AC power, red LED status |
| Features | Test-hush button, tamper resist pin |
| Certification | UL Certified |
| BuiltIn Media | User manual |
| Mfr Part Number | HD135F |
| Product Style | Hardwired Heat Detector |
Frequently asked questions
Is the Kidde HD135F a smoke detector?
No. It is a heat alarm that sounds when temperatures rise above 135 degrees Fahrenheit; it does not detect smoke.
How many Kidde devices can be linked with the HD135F?
Up to 24 Kidde devices, of which 18 can be initiating devices, within the NFPA limit.
How do I test the Kidde heat detector?
Press the test-hush button, which also silences false alarms.