天然气加热器通过燃烧天然气或LP（丙烷）来加热水。燃气热水器需要空气源，也需要正确排放。冷水通过内部“汲取管”进入热水器，该“浸管”将冷水迫使冷水到罐的底部，并通过出口连接推出热水。这种布置为给定罐尺寸提供最多的热水。大多数汽油加热器使用先导光。某些型号的导频灯还产生操作电子气阀所需的电源。当冷水进入罐时，气体控制上的温度传感器会告诉主气阀打开。气体流到燃烧器，在飞行员光线下灯。燃烧器所需的空气由安装热水器的房间提供。废气排放到外部。 When the proper temperature is reached, the main gas valve shuts off. Because water can corrode the steel tank, we glass line the inside of the tank and install an anode rod to help reduce corrosion. The temperature and pressure relief valve is a safety device designed to open if the internal temperature or pressure of the tank exceeds certain limits. Water heaters should be large enough to provide adequate hot water even when temperatures are cold and household demand is greatest.