How to choose a carbon monoxide alarm

What to look for

Tick each point the product you are considering meets.

• Check the alarm complies with EN 50291 and carries an approval mark such as the Kitemark.^[1]
• In US-standard products, look for listing by a recognised testing lab such as UL or Intertek ETL.^[4]
• Choose an audible alarm that sounds loudly when carbon monoxide is present.^[2]
• Choose a battery-operated alarm or a mains alarm with battery backup.^[5]
• Check the stated life span before buying: it varies by maker, and some units have a sealed battery for their whole life.^[3]
• Buy one for each room with a gas, oil, coal or wood burning appliance.^[2]
• Add alarms near every sleeping area so the family wakes up at night.^[5]
• Buy from a reputable manufacturer and retailer.^[6]

Avoid

• Do not rely on 'black spot' cards or labels instead of a proper alarm.^[1]
• Avoid cheap, unknown detectors from online marketplaces: tests found some may fail to alert you.^[6]
• Do not fit alarms in garages or right next to a cooker, stove or fireplace; follow the maker's guidance on distance.^[3]
• Do not fit alarms at low level, and never cover or paint over them.^[1]

After you buy

• Test the alarm monthly, following the manufacturer's instructions.^[3]
• Check batteries twice a year.^[5]
• Replace the alarm when the manufacturer says, or every 5 years.^[5]
• Replace any alarm that fails a routine test.^[1]
• Have boilers, heaters and cookers serviced regularly by a qualified engineer, and keep rooms ventilated.^[2]