All domestic gas water heaters supplied or sold in Hong Kong must be approved by the Gas Authority of EMSD. All approved domestic gas appliances bear a GU mark for identification, so that consumers can make an informed choice. Non-domestic gas water heaters (for commercial or industrial use) are not subject to this requirement. However, all gas water heaters must comply with the requirements of the gas legislation.
Pursuant to the Gas Safety Regulations, all newly-installed gas water heaters must be the room-sealed (balanced flue) type water heaters (see diagram). The air intake and flue terminal of this type of heater are on the exterior wall of the flat, so fresh air for combustion is drawn from outside and combustion products are discharged outside the building as well. The heater does not consume or contaminate the air in the room. This can avoid the accumulation of carbon monoxide indoors, which can be very dangerous. Flats in general are provided with flue apertures suitable for the installation of room-sealed (balanced flue) type water heaters to serve their bathrooms. Please note that it is an offence to install new open-flued (natural draught) gas waters heaters or open-flued (fanned draught) gas water heaters [PDF format (5.51MB)] serving bathrooms or showers. Offenders are liable to prosecution.
For their own safety, users of domestic gas water heaters should pay attention to the following:
(Chinese version only) [PDF format (185KB)]
Address | Gas Standards Office, Electrical and Mechanical Services Department, 3 Kai Shing Street, Kowloon, Hong Kong |
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Office Hours | Monday to Friday 8:30 a.m. to 6:00 p.m. (Closed on Saturday, Sunday and public holiday) |
info@emsd.gov.hk | |
Hotline | 1823 Call Centre |
Fax | 2576 5945 |