Regulation 30 Room-sealed appliances
No person shall install a gas appliance in a room used or intended to be used as a bathroom or a shower room unless it is a room-sealed appliance.
No person shall install a gas fire, other gas space heater or a gas water heater of more than 14 kilowatt heat input in a room used or intended to be used as sleeping accommodation unless the appliance is a room-sealed appliance.
No person shall install a gas fire, other gas space heater or a gas water heater of 14 kilowatt heat input or less in a room used or intended to be used as sleeping accommodation unless—
it is a room-sealed appliance; or
it incorporates a safety control designed to shut down the appliance before there is a build up of a dangerous quantity of the products of combustion in the room concerned.