Where should I place a CO detector?

Many people think carbon monoxide rises or sinks, but in fact, CO just mixes with the air. That’s why the right placement of a detector depends on the type of room and whether there’s a combustion appliance present.

In a room WITH a combustion appliance

Is there a potential CO source like a stove, boiler, or water heater? Then you need to install the detector differently than in a room without a combustion appliance.

This is because the warm gases from the combustion appliance rise, and they can carry the released carbon monoxide upwards.

Placement tips

• Mount the detector above the appliance or on the ceiling.
• Make sure the detector is placed 1 to 3 meters horizontally from the appliance.
• Place the detector at least 30 centimeters away from walls and corners.
• If you have a slanted ceiling, mount the detector on the higher side of the slope.

Don’t want to drill holes? Use a magnetic mounting kit.

In a room WITHOUT a combustion appliance

In rooms without a combustion appliance, like a bedroom or living room, carbon monoxide spreads evenly through the air. So, you don’t need to place the detector on the ceiling here.

Placement tips

• Mount the detector at breathing height (such as sitting, walking, or sleeping height).
• Ensure the detector isn’t placed near ventilation openings or behind obstacles like curtains or furniture.
• Make sure the alarm can be heard from every corner of the room.

Where to NEVER place a CO detectors 

Not every spot in your house is suitable for a CO detector. In some areas, the detector won’t work correctly or could even be damaged. So, never place the detector:

• Behind curtains or furniture
• In drafty areas, such as near a window or door
• In areas with a lot of dust, like a garage or greenhouse
• Directly in sunlight
• Under a fan or air conditioner

How does a carbon monoxide detector work? 

A CO detector continuously measures the concentration of carbon monoxide in the air. When the amount of CO reaches a dangerous threshold, it often starts with a pre-alarm. This early warning gives you time to ventilate the room and leave.

If the concentration keeps rising, the main alarm goes off. This warns you in time before the situation becomes really dangerous.

Some detectors run on batteries, while others are connected to the mains. For extra security, many have a backup battery in case of a power outage. Pay attention to the different options and choose what suits your situation best.

A CO detector is NOT a substitute for maintenance! 

Although a CO detector warns you of dangerous CO levels, it doesn’t prevent the creation of carbon monoxide. Make sure your appliances, like your boiler and chimneys, are regularly serviced. That’s the best way to truly prevent CO danger. The detector will only sound an alarm once CO is already present, and by then, it may be too late.

Tips when buying a carbon monoxide detector

There are many CO detectors on the market, but not all of them are reliable. Here’s what to look out for:

Reliable brands and CE marking

Always choose a detector with a CE marking. This indicates that the detector meets European safety standards. Cheap detectors without this certification are often unreliable.

Lifespan

CO detectors have a limited lifespan, usually around 5 years. Some last up to 10 years but are often more expensive. Check the production date of your detector and replace it in time.

Multiple detectors

It’s a good idea to install a CO detector in every room with a combustion device. Think of your central heating boiler, stove or geyser. Make sure you can hear the alarm signal anywhere in the house, especially in the bedroom.

Do not buy a combination detector

A combination alarm for smoke and carbon monoxide seems handy, but often doesn't work well. Smoke rises quickly, while carbon monoxide spreads through the air. Rather, install two separate detectors: a smoke detector on the ceiling and a carbon monoxide detector at breathing height.