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Kidde HD135F 135°F Hardwired Heat Alarm with Battery Backup
The Kidde HD135F Heat Alarm provides fixed-temperature heat detection for areas where a heat alarm is appropriate. It operates on 120VAC power with a 9V battery backup and sounds when the temperature reaches 135°F.
- 135°F fixed-temperature heat alarm
- 120VAC hardwired power with 9V battery backup
- Interconnectable with compatible Kidde alarms and devices
- Test button and flashing red operating LED
- UL Listed with a 5-year limited warranty
Price:
$70.00
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Kidde HD135F 135°F Hardwired Heat Alarm
The Kidde HD135F is a hardwired fixed-temperature heat alarm designed to respond to elevated temperature rather than smoke. When the temperature at the alarm reaches approximately 135°F, the unit activates its audible alarm.
The HD135F operates from a 120VAC, 60Hz power source and includes a 9V battery backup to maintain protection during a power outage. It can operate as a single-station heat alarm or be interconnected with compatible Kidde alarms and accessories. Heat alarms can be useful in locations where environmental conditions make conventional smoke detection less suitable, when permitted by applicable codes and installation requirements.
Key Features & Benefits
- 135°F fixed-temperature detection: Alarm activates when the temperature at the unit reaches its fixed temperature threshold.
- Hardwired AC power: Operates from a 120VAC, 60Hz electrical supply.
- 9V battery backup: Provides backup operation during AC power interruptions.
- Interconnect capability: Can be interconnected with compatible Kidde alarms and accessories for multiple-station installations.
- Test button: Allows testing of the alarm's electronic circuitry, horn and battery function.
- Red LED indicator: Flashes periodically to indicate normal operation.
- Low-battery indication: Alerts users when the backup battery requires attention.
- Quick-connect power harness: Helps simplify hardwired installation.
- UL Listed: Listed for its specified heat-alarm application.
Kidde HD135F Specifications
| Brand: | Kidde |
| Model: | HD135F |
| Product Type: | Fixed-temperature heat alarm |
| Temperature Rating: | 135°F fixed temperature |
| Primary Power: | 120VAC, 60Hz |
| Backup Power: | 9V battery |
| Interconnectable: | Yes, with compatible Kidde alarms and accessories |
| Maximum Ambient Temperature at Ceiling: | 100°F |
| UL Recommended Spacing: | 50 ft. |
| UL Recommended Coverage: | Up to 2,500 sq. ft., subject to installation conditions and applicable requirements |
| Listing: | UL Listed |
| Warranty: | 5-year limited warranty |
How the Kidde HD135F Works
Unlike a smoke alarm, the HD135F responds to temperature rather than airborne smoke particles. Its fixed-temperature sensing element activates the alarm when the temperature reaches approximately 135°F.
This makes a heat alarm useful as supplemental fire detection in certain areas where smoke alarms may not be appropriate because normal environmental conditions could contribute to nuisance alarms. Always follow the manufacturer's installation instructions and applicable fire and building codes when determining alarm type and placement.
Where Is the Kidde HD135F Best Used?
Kidde identifies the HD135F for applications where fixed-temperature heat detection is appropriate. Potential applications can include:
- Attached garages
- Utility and mechanical areas
- Workshops
- Storage areas
- Other locations where a 135°F fixed-temperature heat alarm is specified or permitted
Important:
The HD135F is a heat alarm, not a smoke alarm. It should not be used as a substitute for required smoke alarms. Heat alarms and smoke alarms detect different fire conditions and should be installed according to the manufacturer's instructions and applicable codes.
The HD135F is a heat alarm, not a smoke alarm. It should not be used as a substitute for required smoke alarms. Heat alarms and smoke alarms detect different fire conditions and should be installed according to the manufacturer's instructions and applicable codes.
Interconnecting the HD135F
The HD135F can be interconnected with compatible Kidde alarms and accessories. When one interconnected initiating alarm activates, the interconnected system can alert occupants in other protected areas.
Kidde states that an interconnected system may contain up to 24 compatible devices, with no more than 18 initiating devices. Always verify individual model compatibility and follow Kidde's installation instructions when designing or modifying an interconnected alarm system.
Heat Alarm vs. Smoke Alarm
| Feature | Kidde HD135F Heat Alarm | Smoke Alarm |
| Detects | Elevated temperature | Smoke particles |
| Activation | 135°F fixed temperature | Varies by smoke-sensing technology |
| Primary Purpose | Supplemental heat detection where appropriate | Early detection of smoke from a developing fire |
Frequently Asked Questions
Is the Kidde HD135F a smoke alarm?
No. The HD135F is a fixed-temperature heat alarm. It responds when the temperature reaches approximately 135°F rather than detecting smoke particles.
Does the HD135F have battery backup?
Yes. The alarm is powered by 120VAC and uses a 9V battery for backup power.
Can the Kidde HD135F be interconnected?
Yes. The HD135F can be interconnected with compatible Kidde alarms and accessories. Verify compatibility with the specific models being installed.
Can I use the HD135F instead of a smoke alarm?
No. A heat alarm does not provide the same type of detection as a smoke alarm and should not replace smoke alarms required for life-safety protection.
Is the Kidde HD135F suitable for a garage?
Kidde identifies the HD135F as suitable for many home and attached-garage applications. Installation must still comply with the manufacturer's instructions and applicable local codes.
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