Kidde Plug-In Combination Explosive Gas/Carbon Monoxide Alarm Detector with Battery Back-up-KN-COEG-3 - The Home Depot
Message to Our Customers


Model # KN-COEG-3

Internet # 100003545

Store SKU # 791898

Plug-In Combination Explosive Gas/Carbon Monoxide Alarm Detector with Battery Back-up

Kidde Plug-In Combination Explosive Gas/Carbon Monoxide Alarm Detector with Battery Back-up

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

$39.88 / each
  • Easy to use and reset
  • Detects airborne methane and propane particles
  • Install directly into AC wall outlet or use included power cord


Model # KN-COEG-3

Internet # 100003545

Store SKU # 791898

Store SO SKU # 198092

Protect your home from dual threats by utilizing the Kidde AC Combination Carbon Monoxide/Explosive Gas Alarm. This combination alarm features a digital display that shows the current level of carbon monoxide or methane or propane gas in the air. When a threat is detected, this alarm produces a loud 85 dB pulsing alert that is sure to get your attention.

  • Combines a carbon monoxide and natural gas detector in a single unit for comprehensive protection
  • Metal oxide gas sensor is designed to detect particles of airborne methane and propane
  • 85 dB pulsing alarm sounds to alert you of a potential threat
  • Test/reset button performs a system check to ensure proper operation
  • 9 Volt battery backup provides protection during power outages
  • Peak level button recalls the highest carbon monoxide reading last detected since the most recent reset or power disconnection
  • Digital display shows the level of carbon monoxide or gas currently being detected
  • Install into an AC wall outlet directly or with the included 6 ft. power cord
  • UL listed

Info & Guides

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Assembled Depth (in.) 
4 in 
Assembled Height (in.) 
1.25 in 
Assembled Width (in.) 
6 in 
Coverage area (sq. ft) 
Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Alarm Type 
Carbon Monoxide,Natural Gas,Propane 
Alarm/Detector Features 
Battery Back-Up,Digital display 
Calibration (% of LEL) 
Connector/Contact Type 
Fixed or portable 
Gas(es) detected 
Natural gas 
Minimum detection (ppm) 
Power Source 
Response time (sec.) 
Voltage (volts) 
Warranty / Certifications
Certifications and Listings 
1-UL Listed 


Rated 4.4 out of 5 by 88 reviewers.
Rated 5.0 out of 5.0 by This product is a must have. The product has Night Hawk technology which our fire dept suggest a carbon monoxide alarm have. It is easy to read, has a battery back up and is reasonably priced. We have one in our lower level, main level and upstairs level of our home. The carbon monoxide/gas alarm combination is the best way to go. March 4, 2014
Rated 5.0 out of 5.0 by Well worth the money Bought this because my boys bedroom was being built close to the furnace. Didn't expect it to go off the minute I plugged it in. Turns out there was an issue with the furnace. Awesome product, a true life saver. October 1, 2014
Rated 5.0 out of 5.0 by Peace Of Mind CO2 detectors are becoming more mainstream and unfortunately house explosions seemingly more frequent. Just 2 years ago not far from our residence an older couple lost their lives when their home exploded as they slept. Our century home is well over 100 and the hot water heat boiler (slated for replacement when finances permit) should be in a museum. The boiler and all mechanical systems are regularly maintained but never leave anything to chance. The CO2 / explosive gas detector makes perfect sense. After reading the reviews this detector was purchased and installed in a handy wall outlet at the top of the stairs right outside our bedroom. An unlit propane torch provided a gas "leak" source and the unit responded in a timely manner. I have no doubt the CO2 detection is as responsive. The unit has a pull-out tab on the backside to stabilize the unit against the wall. This tab needs a firmer lock as the unit is frequently bumped due to the location of the wall outlet right at the end of the stair handrail. The stabilizing tab consistently retracts with the slightest bump. Other than that minor annoyance the unit gives peace of mind. The recent price reduction was a nice plus. December 11, 2014
Rated 5.0 out of 5.0 by 2 monitors in one An easy, no brain er to protect your family. I read the instructions to know what to expect and plugged it in. That simple. Yes, there is a shelf life and I'll have to replace it in years to come, but I'm fine with that. I really like that it is outside my HVAC closet monitoring to two items that concern me at that location. February 4, 2015
Rated 4.0 out of 5.0 by I don't want to die of bad gas! Plugs into the wall socket. A little large. Seems to be good quality. February 3, 2015
Rated 5.0 out of 5.0 by Detects natuaral gas as well as other solvent fumes. Bought a second one to replace an old one that I have been using for several years. The old one stll works fine as well as the new one. Product quality has not changed over the the past several years as many things seem to do. As well as natural gas they also detect hydrocarbon vapors from cleaning solvents and also the wife's harispray propellant. December 30, 2014
Rated 5.0 out of 5.0 by Very Good Detector I have been using this detector for well over 15 years. This is the third one we have since they by design only last 5 years or so. So far no gas has been detected but we do regularly test the unit by uing small amounts of natural gas. Yes to verify only. Small price to pay for peace of mind. May 13, 2015
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