To keep them in a safe condition, all gas appliances should be regularly checked and maintained by a competent person who is Gas Safe registered. Although not a substitute for having your appliances serviced and checked regularly, additional protection can be obtained by the installation of carbon monoxide alarms, especially where open-flued or flueless gas appliances are installed.

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In England and Wales, the Building Regulations require a carbon monoxide alarm to be fitted when a new gas appliance is installed. (However, this requirement does not apply to gas cooking appliances.) For all existing gas appliances that do not currently have an alarm fitted, an alarm is strongly recommended as a second line of defence against carbon monoxide poisoning.