All Carbon Monoxide Detectors

The recommended minimum is one carbon monoxide detector per floor of your home. BS EN 50292:2023 advises fitting one in every room where a fuel-burning appliance operates. Larger or multi-storey properties will need more than one unit to ensure adequate coverage throughout the building.

Carbon monoxide detectors are typically designed with electrochemical sensors that react to CO molecules in the air. The sensor generates a signal proportional to CO concentration. Once levels reach a dangerous threshold, the alarm triggers. UK-compliant detectors follow BS EN 50291, which sets the concentration and exposure time required before an alarm sounds.

Carbon monoxide detectors are best placed in rooms where fuel-burning appliances operate, such as those containing a boiler, gas fire or log burner. BS EN 50292:2023 recommends fitting at least one per floor of your property, to ensure CO is detectable wherever it builds up.

The lifespan of a carbon monoxide detector is typically seven to ten years, after which the sensor degrades and the unit must be replaced entirely. Most models display an end-of-life warning. Replacing a detector on time is as important as testing it regularly, as an aged sensor may fail to detect dangerous CO levels.

The ideal position is within 1 to 3 metres horizontally of a fuel-burning appliance, as recommended by BS EN 50292:2023. Avoid placing detectors in damp or humid locations, near windows or doors where draughts could affect readings, or anywhere subject to temperature extremes outside the range of minus 5°C to 40°C.

When your carbon monoxide detector sounds, treat this as an emergency. Move everyone outside immediately and ensure fresh air reaches all occupants. Do not ignore the alarm or assume it is faulty. Once outside, call the gas emergency number on 0800 111 999 and seek medical attention if anyone feels unwell, dizzy or nauseous.

Never re-enter the property until gas engineers have declared it safe. Turn off gas appliances if you can do so quickly and safely, but evacuating takes priority over everything else. Carbon monoxide poisoning symptoms include headaches, tiredness, confusion and stomach pain. These symptoms often mimic flu but without fever.

Keep windows and doors open when you return to ensure continued ventilation. Have all gas appliances, flues, and chimneys checked by qualified engineers before normal use resumes. Replace the carbon monoxide detector if it continues to alarm after the source has been identified and resolved.

Position carbon monoxide alarms in rooms containing fuel burning appliances such as boilers, fires or cookers. Mount detectors on walls at head height, typically 1 to 3 metres from the appliance. Avoid placing units directly above appliances where heat and steam might cause false alarms.

Install detectors in bedrooms and hallways near sleeping areas where the alarm can wake occupants. Each floor of your home should have at least one carbon monoxide alarm. Avoid locations near windows, doors or ventilation fans where draughts might prevent proper detection.

Keep detectors away from bathrooms and kitchens where humidity and cooking fumes can interfere with sensors. Mount units at least 15cm from ceilings and corners where air circulation is poor. Battery powered models offer flexibility for placement, and hardwired options provide constant power.

Test your detectors monthly and replace batteries annually or when low battery warnings sound. Most carbon monoxide alarms last 7 to 10 years before replacement becomes necessary.

The best carbon monoxide detector combines reliable sensing technology with user friendly features. Look for units meeting British Standard EN 50291 certification, which ensures proper performance and safety standards. Digital displays showing carbon monoxide levels provide valuable information beyond simple alarm functions.

Long life sealed battery models eliminate the need for annual battery changes and maintain continuous protection. These units typically operate for 10 years before requiring complete replacement. Some models feature wireless connectivity, allowing multiple alarms throughout your home to sound simultaneously when one detects carbon monoxide.

Voice announcements clearly identify carbon monoxide alerts, helping distinguish them from smoke alarm signals. Backlit displays remain visible in darkness, while memory functions record peak readings for later review. Consider models with smart home integration if you want remote monitoring capabilities.

Many quality detectors are designed for straightforward DIY installation. Regular testing and maintenance keeps any carbon monoxide alarm functioning properly throughout its lifespan.

Carbon monoxide (CO) and carbon dioxide (CO2) are different gases requiring different detection methods. Carbon monoxide results from incomplete combustion in gas appliances, vehicle engines and fires. This toxic gas prevents oxygen from reaching vital organs and can be fatal in enclosed spaces.

Carbon dioxide occurs naturally in air and increases in poorly ventilated areas. While generally less dangerous than carbon monoxide, high CO2 concentrations can cause drowsiness and reduced cognitive function. Most residential properties need carbon monoxide detection rather than carbon dioxide monitoring.

Carbon monoxide detectors use electrochemical sensors specifically designed to identify CO gas. These alarms typically sound when levels reach 50 parts per million over extended periods or higher concentrations more quickly. Carbon dioxide detectors measure CO2 levels and are mainly used in commercial or industrial settings.

Ensure you purchase carbon monoxide detectors for home protection against gas and fuel-burning appliance hazards. These devices specifically target the deadly CO gas that threatens families each heating season across the UK.

In short: yes, but there isn't just one, single rule to follow.

Legislative requirements for carbon monoxide alarms vary by which country of the UK your house is in and whether it is rented or owner-occupied. Most legislation requires at least one carbon monoxide alarm is fitted near new or replacement fuel-burning appliances (e.g. boiler, oven, fire place), specifically either 'tamper-proof' / 'sealed for life' alarms such as those using lithium batteries, or alternatively mains-powered models which are directly wired into mains supply as opposed to plug-in types. Some countries have exceptions for fuel-burning appliances used solely for cooking. Rented properties mostly require a CO alarm immediately even if no appliances are being installed or replaced.

Please see our page on carbon monoxide alarm legislation for more specific guidance, links to relevant legislation & government guidance, and links to carbon monoxide alarms suitable for each. Alternatively, please view our full range of carbon monoxide alarms if you already know what type you need.