CENWAT – Central Heating Boilers and Water Heaters - Covers the installation and maintenance of domestic gas-fired central heating systems and instantaneous water heaters.

CKR1 – Domestic Cookers - Assessment of safe installation, commissioning, and servicing of gas cookers and hobs in domestic properties.

HTR1 – Gas Fires and Wall Heaters - Ensures competency in the installation and servicing of open-flue and room-sealed space heating appliances.

DAH1 – Warm Air Heating Appliances - For engineers working with ducted air heaters and warm air systems.

LAU1 – Laundry Appliances Assessment - for safe work on commercial-style laundry appliances within domestic environments.

MET1 – Domestic Gas Meters - Covers the installation and exchange of domestic-sized gas meters up to 6 cubic metres per hour.