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Unbranded Carbon Monoxide Alarm review

Product alert

Don't Buy carbon monoxide (CO) alarms that look like the one featured here - we've tested six different varieties and all failed repeatedly to detect CO in our tests.

We tested three alarms that look like this one in 2016 and each of them failed to sound in between five and 15 of the 33 carbon monoxide tests. In 2018 we tested three more of this type of alarm and again, each of the products on test regularly failed to detect CO.

The alarms are unbranded or come with unfamiliar brand names. The packaging may vary in design, but the alarms all look alike and each of the six we've tested has been dangerously unreliable at detecting CO.

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Reviewed

We have tested six alarms that look like the alarm pictured here and each has failed to detect the presence of carbon monoxide reliably in our tests. If the CO alarm in your home looks like the one shown, you will need to replace it because our tests prove that it’s likely to be unsafe.We’ve given alarms that look like this one our Don’t Buy warning, based on the six seemingly identical alarms that failed our CO tests.

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Test results

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

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We have tested 21 carbon monoxide detectors and found that there are 4 Don't Buys and 17 Best Buys.
Range of Carbon monoxide detector scores
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