Fireangel CO-9D Meta-Review

Fireangel CO-9D Carbon Monoxide Detector

The Fireangel CO-9D carbon monoxide detector strikes a good balance between versatility and value for money because it can be mounted on a wall or used as a portable CO alarm and it's certified for use in caravans and motor caravans.

The CO-9D is suitable for use by UK Landlords.

It has received excellent reviews and recommendations from verified customers at several online retailers which is not surprising because the CO-9D has been Fireangel's best selling CO detector for some time now.

Fireangel CO-9D Diagram

The Fireangel CO-9D comes with a sealed in battery which lasts for the entire 7 year life of its sensors, so the battery will never need replacing. The battery is activated by removing the tab, as indicated by the diagram to the right, and it can be deactivated by reinserting the tab at any time - useful for when you're travelling or when you need to store it away for a while.

The digital display will show CO levels as low as 10ppm (parts per million) and the alarm will sound at the following exposure levels:

  • 50 ppm detected over 60 to 90 minutes
  • 100 ppm detected over 10 to 40 minutes
  • 300 ppm detected in less than 3 minutes
  • First Alert CO410 Features

    • Uses a sealed battery which lasts for 7 years which is when it needs replacing so you'll never have to buy replacement batteries.

    • Performs regular self-diagnostic tests and it will alert you if it has malfunctioned.

    • Also has a test button for manually running the self diagnostic tests.

    • The alarm is 85dB loud at a distance of 1 metre.

    • Comes with a 7 year manufacturer warranty.

    • Completely portable - can be taken on holidays and rated for both caravans and motor caravans.

    • Certified to the European Carbon Monoxide alarm Standards EN 50291-1: 2010, EN 50291-2: 2010, and Kitemarked KM 551504.

    • Operating temperature range: .-10°C to 40°C

    • Operating humidity range: 30% to 90% RH non-condensing.

    • It can also be used as a room thermometer by setting the digital display to show the current temperature.


    • The large front panel button and digital display make it easy to operate.
    • Portable and rated for use in caravans and motor caravans.
    • Comes with a 7 year warranty.


    • Some customers have reported in the past that their unit was delivered with a defective battery and had to send it back for a replacement, although I haven't seen these reports repeated in the last 12 months.
    • The thermometer is not particularly accurate and can have an error of +/– 2°C.
    • Not rated for use on boats.


    Although the Fireangel CO-9D has a 3 year shorter life span than it's main market place rival the Kidde 10LLDCO, it makes up for that with its versatility and portability. The Fireangel brand is also very well established with a long track record of producing reliable CO and smoke alarms.

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    Please understand that you need multiple CO alarms in your home in order to safely cover all the possible carbon monoxide build ups - for more information see Carbon Monoxide Detector Placement Instructions.