Carbon Monoxide (CO) Detectors

No, a carbon dioxide alarm measures a gas that signals stale air, whereas a carbon monoxide (CO) alarm detects a poisonous gas. Carbon monoxide comes from fuel-burning appliances, such as boilers, fires and stoves, that burn poorly or have a blocked flue. A carbon dioxide monitor gives no protection against carbon monoxide poisoning. The range here includes carbon monoxide alarms and detectors.

A carbon monoxide detector usually chirps because its battery is low, it has a fault, or its sensor has reached end of life. Check the warning light against the manual to see which. A loud, continuous alarm means carbon monoxide has been detected: open windows, turn off fuel-burning appliances, get everyone outside and call the gas emergency line.

Yes, combined alarms pair a smoke or heat sensor with a carbon monoxide sensor in one unit, which saves ceiling space and wiring. Check that a combined alarm meets the fire and CO standards, such as BS EN 14604 and BS EN 50291-1, and that its position suits the fire and CO risks. The range here includes combined smoke, heat and carbon monoxide detectors.

A carbon monoxide detector should usually go in the room with a fuel-burning appliance, such as a boiler, fire or stove, between one and three metres from it. On a wall, fit it above the height of doors and windows but not tight to the ceiling. Avoid spots next to extractor fans, vents or cooking appliances, and follow the maker's instructions.

A carbon monoxide detector is an alarm that senses carbon monoxide, an odourless poisonous gas, and sounds a warning when levels become dangerous. Domestic models usually use an electrochemical sensor and come in battery, mains and wireless versions. Look for one that meets BS EN 50291-1. The range here includes battery, mains and wireless carbon monoxide alarms.