Kidde Hardwire Interconnectable 120-Volt Smoke Alarm-21006374 - The Home Depot
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Model # 21006374

Internet # 100189792

Hardwire Interconnectable 120-Volt Smoke Alarm

Kidde Hardwire Interconnectable 120-Volt Smoke Alarm

This item has been discontinued.
The Home Depot no longer carries this specific product.

$13.97 / each


Model # 21006374

Internet # 100189792

Basic AC powered ionization smoke alarm with hush and test features. Alarm uses ionization sensing technology. Ionization sensing alarms may detect invisible fire particles (associated with flaming fires) sooner than photoelectric sensing technology alarms. It also has a tamper resist locking feature to deter alarm theft. Alarm memory flashes red LED indicating which unit was the initiating alarm in interconnected system.

  • Large mounting base makes mounting easier
  • Interconnectable pre-stripped wiring harness with easy off cap
  • Tamper resist locking feature
  • Ionization sensing alarms may detect invisible fire particles

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
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Alarm Type 
Alarm/Detector Features 
Hush Feature 
Commercial / Residential 
Commercial / Residential 
Connector/Contact Type 
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Voltage (volts) 
Warranty / Certifications
Certifications and Listings 
1-UL Listed 


Rated 4.0 out of 5 by 6 reviewers.
Rated 1.0 out of 5.0 by FALSE ALARMS!!!! I was happy with this alarm when I first purchased it to replace all of my old discolored in my home due to the universal plug & quick installation. However, less than 48 hours after installing all 13 of them in my house I have had false alarms going off every 4-18 hours at random times & in the middle of the night (not much fun when you have a 5 month old that just started sleeping through the night).Now, I have about a 8 hour testing & troubleshooting process to go through to find out how many of them are actually bad. I would strongly recommend to spend a few extra bucks, get a better unit even if it requires some rewiring. Naturally, I don't have the boxes anymore so returning them is out of the question. June 26, 2011
Rated 4.0 out of 5.0 by Replacements for 10 year old originals Direct replacement. I have 7 tied together. The two I have replaced have a red light that flashes periodically that I don't find in the instructions. Maybe when I get them all changed out the red light will stop. For now it's not a problem. They do work with the old units. October 17, 2014
Rated 5.0 out of 5.0 by Just what the doctor ordered Perfect fit and most importantly, they work wonderfully. I didn't even have to replace the base, just plug in and test. They were also very economical. November 12, 2013
Rated 4.0 out of 5.0 by Easy to install, no false alarms This was an easy retrofit due to the wiring harness it comes with plus the mounting plate had several hole width options, so it was an easy replacement of the unit I was replacing. October 29, 2013
Rated 5.0 out of 5.0 by Perfect alarm for a home with a battery back up system. If your home has a battery back up system for your hard wired fire and alarm systems this unit is the perfect choice. No separate unit battery to maintain or replace. Hush feature is a must and the green/red LED light lets you know immediately if your unit is working or which unit initiated the alarm. Easy install. May 28, 2011
Rated 5.0 out of 5.0 by They were what I wanted. Good experience from start to finiish. Do not know why you are not satisfied with first sentence. January 31, 2012
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