How do solar water heaters work?
Solar water-heating systems can be used in any climate, and the fuel they use-sunshine-is free. These systems include storage tanks and solar collectors. There are two types of solar water-heating systems: active, which have circulating pumps and controls, and passive, which don’t. Most solar water heaters require a well-insulated storage tank. Solar storage tanks have an additional outlet and inlet connected to and from the collector. In two-tank systems, the solar water heater preheats water before it enters the conventional water heater. In one-tank systems, the back-up heater is combined with the solar storage in one tank.
