Solar water heaters, also called solar domestic hot water systems, can be a cost-effective way to generate hot water for your home. They can be used in any climate, and the fuel they use, sunshine, is free. Solar water heating 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.
Solar water heating systems almost always require a backup system for cloudy days and times of increased demand. Conventional storage water heaters usually provide backup and may already be part of the solar system package. A backup system may also be part of the solar collector, such as rooftop tanks with thermosyphon systems. Since an integral, collector storage system already stores hot water in addition to collecting solar heat; it may be packaged with a demand (tankless or instantaneous) water heater for backup. For more information on solar hot water systems call Advantage Development Co., an award winning custom green builder in Asheville NC. Call us at 828.215.9064 or visit us at http://www.advdevco.com/ to learn more.