You must do not fix gas water heater in these site: Bathroom, bedroom, basement, garage, under of ladder, escape way, site where have easy fire, closed to wires and appliance, and outside of house.
You may fix gas water heater at the kitchen room, roof terrace, and keep air circulate.
Flame window which distance from end between 1.5 and 1.8m,
For this kinds of gas water heater, You must fix exhaust pipe, it material must be heat-resistance, corrosion resistance, difficulty fire, it’s better to select stainless steel which thickness more than 0.3mm.
You selected exhaust pipe, whose diameter must be same with gas water heater exhaust, and 30cm height above bent.
The exhaust pipe must do not across bathroom, toilet room, living room, bedroom, and use aluminum tape for sealing.
The length of exhaust pipe should be less than 3 m, and bent less than 2 pc, which direction should downward 3°-5°。
Do not insert exhaust pipe into public flue, otherwise it may leakage to others house for dangerous.
Before installation, You must check if house gas type is same with water heater gas type. And how is water supply if good pressure and clean water.