Kidde Firex Hardwired Inter-Connectable 120-Volt Auxiliary Heat Detector 135 Degree with Battery Backup

Item # 604034 | Kidde Part # 21029895 | UPC Code 025417841350 | UNSPSC Code 46191502 | Catalog Page #1135
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Product Overview

The Kidde FireX HD135F is a 120-Volt AC Wire In Heat Alarm that responds to temperature rather than smoke. The alarm will sound if temperatures rise above 135 degree F. The Kidde HD135 degree F is inter connectable. The interconnect system must not exceed the NFPA (National Fire Protection Association) limit of 18 initiating devices (Smoke, heat, CO, etc.) interconnected, it is still possible to interconnect 6 strobe lights and or relay modules. This unit includes a 5-year limited warranty and is UL Listed.

  • Receive an instant alert when temperatures exceed 135 degree F
  • Test button assures proper operation of the sensor's electronic circuitry, horn and battery function
  • Interconnects with up to 24 Kidde devices (of which 18 can be initiating), including smoke and carbon monoxide alarms
  • 9-Volt battery backup provides continuous protection even during power outages
  • Red LED flashes every 30 - 40 seconds to indicate proper operation
  • Quick-connect power harness for fast and easy installation
  • Tamper-proof pin helps deter tampering and theft
  • Replacement 9-Volt battery Kidde model 21025830
  • UL/CSFM Ref. HD135F
  • Not a smoke detector
  • Compatible with Kidde, FireX, Code One and Sentinel products
  • Kidde offers a full range of 120-Volt AC wire-in life safety products with interconnect capability to provide the most immediate and complete system available; when any 1 interconnected alarm is triggered, all interconnected alarms within the home sound an immediate warning
  • UL/CSFM Ref. Kidde Part HD135


Certifications and Listings
UL Listed
Battery Back-Up, Hush Button, Wire-free Interconnect
No additional components or accessories are included
Pack Size
Power Source
Product Depth (in.)
Product Height (in.)
Product Width (in.)
Required Battery Type

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