Best carbon monoxide alarms in Canada on Amazon.ca

By the Amazon Picks Desk, Canada News Media. We research products from real Amazon.ca listings and customer reviews; we have not tested them ourselves.

Disclosure: As an Amazon Associate, we may earn a commission from qualifying purchases made through this link.

Furnaces, fireplaces and space heaters are running again across Canada, which makes this a sensible week to check the carbon monoxide (CO) alarms in your home. CO is a colourless, odourless gas, and an alarm is the only way most people would know it is building up. Health Canada advises a CO alarm near every bedroom; see our report on how to test your smoke and CO alarms before winter if you already own some.

Below are six alarms from Amazon.ca, chosen from the search results for CO and smoke alarms for their ratings, review counts and the range of ways they are powered. Prices were shown on Amazon.ca on Nov. 5, 2026, and may change.

Kidde plug-in CO alarm with AA battery backup

A plug-in model for a bedroom or hallway outlet that keeps working in a power outage on its backup battery. It was the listing marked “#1 Top Rated” in the search results.

• Price: $49.99 on Amazon.ca
• Rating: 4.8 out of 5 from about 1,300 ratings
• Plugs into a wall outlet with AA battery backup
• Test-hush button, per the listing title

See the current price on Amazon.ca

First Alert CO605A plug-in alarm

The most-reviewed plug-in alarm in the results and a Bestseller badge holder, with more than 4,000 bought in the past month, per Amazon.ca. A lower-priced option for covering several rooms.

• Price: $35.79 on Amazon.ca
• Rating: 4.6 out of 5 from about 2,500 ratings
• Plug-in with battery backup

See the current price on Amazon.ca

Kidde Nighthawk battery-operated CO alarm

A battery-operated alarm needs no outlet, so it suits a basement, a cabin or a room without a free socket. Amazon.ca showed more than 300 bought in the past month.

• Price: $44.00 on Amazon.ca
• Rating: 4.7 out of 5 from about 354 ratings
• Battery operated, model KN-COB-B-LP

See the current price on Amazon.ca

Kidde C3010D with digital display and 10-year sealed battery

A sealed 10-year battery means no battery swaps for the life of the unit, and the digital display shows the CO level. It was listed with a was-price of $61.00.

• Price: $45.77 on Amazon.ca (was $61.00)
• Rating: 4.7 out of 5 from about 1,200 ratings
• 10-year sealed battery
• Digital display

See the current price on Amazon.ca

First Alert SC9120BCA hardwired smoke and CO alarm

A combination smoke and CO alarm that connects to household wiring, for homeowners replacing existing hardwired units. Hardwired alarms are normally installed by a qualified electrician, so check local rules before swapping one yourself.

• Price: $58.46 on Amazon.ca (list $61.99)
• Rating: 4.5 out of 5 from about 1,400 ratings
• Hardwired combination smoke and CO alarm

See the current price on Amazon.ca

Kidde DETECT 10-year battery smoke and CO alarm

One battery-powered unit that covers both smoke and CO, with no wiring. It has fewer ratings than the others here, so its score is less settled.

• Price: $61.98 on Amazon.ca (list $80.99)
• Rating: 4.5 out of 5 from 23 ratings
• 10-year battery, photoelectric smoke sensor, plus CO

See the current price on Amazon.ca

How we chose

We looked at the Amazon.ca search results for CO and smoke alarms and picked well-known brands with strong star ratings and large review counts, covering plug-in, battery, sealed 10-year and hardwired designs. We did not read customer reviews for this guide and have not tested any of these alarms. Prices, ratings and stock change often. Whichever you buy, check that it carries a Canadian certification mark, replace it by the date printed on the unit, and test it monthly. See our guide on testing smoke and CO alarms at home.

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