Products manufactured by suppliers of carbon monoxide (CO) alarms and detectors certified by the British Standards Institution (BSI) are independently tested and comply with BS EN 50291 standards. Major CO alarm suppliers holding the BSI Kite Mark certification include FireAngel, Kidde, Anka, Ei Electronics, and Heiman.

These top-certified alarms from these suppliers all utilize electrochemical sensors and are sold through major retailers:

FireAngel (e.g., FA3820X4 10-year alarm): Rigorously tested by the British Standards Institution (BSI) and employing advanced carbon monoxide sensing technology. Available for purchase on the FireAngel platform.
Kidde (e.g., K10LLCO 10-year sealed lithium battery alarm): BSI certified, requiring no battery replacement for its entire lifespan.
Anka (AJK83X series): The Anka-Aj83X series carbon monoxide detector alarms are BSI certified, offering excellent value for money. They ship globally, and the company is a trusted global service provider.
Ei Electronics (e.g., Ei3018 AC-powered alarm): Equipped with a 10-year rechargeable lithium battery backup power supply and BSI certified.
Heiman (e.g., HM-CO-801): Offers a digital display, a 10-year lifespan, and is BS EN 50291 certified.

AJ83X Series Carbon Monoxide Alarm
AJ83X Series Carbon Monoxide Alarm