Frequently asked questions

Yes. A building with a gas heating appliance or gas water heater must have a working carbon monoxide alarm. It should be installed in a suitable living area according to the alarm manufacturer’s instructions, taking account of the room layout, appliance location and ventilation.

If the appliance uses air from the room for combustion, a sufficient and permanent air supply must be provided. The required opening size depends on the appliance type and output, the room and the technical design of the property. There is no single size suitable for every installation.

An open-flued appliance requires a sufficient air supply from the room. A room-sealed appliance normally receives combustion air from outside, although the room’s general ventilation must still remain operational.

Yes. A powerful extractor may create negative pressure and interfere with the draught of an open-flued gas appliance. This may allow combustion products to enter the room. Safe simultaneous operation depends on the ventilation design and sufficient replacement air.

Delayed ignition, unusual sounds, flame failure or repeated shutdowns may indicate a fault, insufficient combustion air or a draught problem. Switch off the appliance and do not use it until it has been inspected by a qualified specialist.

Only where the condition of the flue, the appliance type and the proposed connection allow it. Suitability must be assessed against the technical documentation, flue condition and manufacturer’s requirements. A ventilation duct or kitchen-extractor duct must not be used for flue-gas discharge.

The appliance must be serviced at the interval specified by the manufacturer. Annual inspection and cleaning are recommended for many models, but the exact interval depends on the appliance, usage and manufacturer’s instructions.

The need for design documentation and approvals depends on the scope of work, the existing gas installation, the appliance output, the flue-gas solution and the building conditions. This must be assessed before work begins.

Error messages, unusual noises, repeated shutdowns, pressure loss, unstable heating or increased gas consumption may indicate a fault. The appliance should be switched off and inspected by a specialist.

A room-sealed boiler normally receives combustion air from outside through a dedicated air-supply and flue system. The room’s general ventilation must nevertheless remain operational and the installation must follow the manufacturer’s instructions.

The boiler must be serviced at the interval specified by the manufacturer. Annual inspection is recommended for many boilers, particularly before the heating season, but the exact interval must be taken from the appliance manual.

With an open-flued appliance, insufficient air may cause poor combustion, loss of draught and combustion products entering the room. With a room-sealed boiler, the air and flue system and the room’s general ventilation should be checked.

Yes, provided that the boiler supports an external cylinder and the system has suitable controls, pipework and output. The correct solution depends on the boiler model, cylinder capacity and the property’s hot-water demand.