1, the gas water heater should be installed in a well-ventilated kitchen, a separate room or a well-ventilated aisle. Rooms with gas water heaters should be brick-concrete structures with windows communicating with the outside world. Room height should be greater than 2.5 meters. 2. The width of the space in front of the water heater should be greater than 80 cm, and the side wall should be greater than 10 cm. When installed on a non-refractory wall surface, the back of the wall should be padded with refractory material with a thickness of not less than 1 cm, and each side exceeds the shell 10 cm. 3. There shall be no exposed wires and electrical equipment on the upper part of the water heater, and the horizontal clear distance between the side and the electrical equipment shall be greater than 30cm. If not, heat insulation measures should be taken. The distance between the water heater and combustible materials such as wooden doors and windows should be more than 20 cm. If this is not possible, flame retardant measures should be taken. 4. The installation height of the water heater should be around 150 cm. The inlet and outlet of gas water heater should be completely out of the wall. It is strictly prohibited to install in public flue.