Don't Buy this carbon monoxide (CO) alarm – it failed to sound in 12 of our carbon monoxide detection tests

Bought from an online marketplace, this is yet another cheap and unbranded carbon monoxide (CO) alarm that you simply can’t rely on to detect CO. We’ve made it a Don’t Buy, as our test results show that it's unreliable when it comes to detecting CO.

UnbrandedCarbon monoxide alarm 11

Name: Unbranded Carbon monoxide alarm 11
Brand: Unbranded
SKU: WH18639-0034-01

£5Typical price

Test result

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This carbon monoxide (CO) alarm can’t detect CO reliably and that’s why we’ve made it a Don’t Buy. It failed to sound the alarm time and time again in our tests, and the consequences of this happening in your home don’t bear thinking about. If you have an alarm that looks like this, replace it with a Best Buy as soon as possible and contact the seller to request a refund.

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Jun 2023Last checked by Which?
Jun 2023First reviewed by Which?
Jan 2023Released

The overall Which? test score is made up of the following star ratings, all determined by our rigorous lab tests.

How we test carbon monoxide detectors

27 Feb 2024

Carbon monoxide (CO) detection

How we test carbon monoxide (co) detection

Five stars means that the CO alarm detected CO in every one of our tests. One star means that the alarm failed to detect CO in one or more of our CO detection tests. We test each carbon monoxide (CO) alarm more than 30 times to see whether it can detect the deadly gas. We test with low concentrations of CO and higher concentrations. We also test with a catastrophically high concentration of the gas. We check whether the alarms respond in time and whether after detecting CO, they can go on to continue to detect the gas.

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UnbrandedCarbon monoxide alarm 11

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