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SOLAR WATER HEATERS

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Illustration of an active, closed loop solar water heater. A large, flat panel called a flat plate collector is connected to a tank called a solar storage/backup water heater by two pipes. One of these pipes is runs through a cylindrical pump into the bottom of the tank, where it becomes a coil called a double-wall heat exchanger. This coil runs up through the tank and out again to the flat plate collector. Antifreeze fluid runs only through this collector loop. Two pipes run out the top of the water heater tank; one is a cold water supply into the tank, and the other sends hot water to the house.

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 waterheaters are also known as domestic hot water systems.

Traditional hot water tanks, unlike solar
solar systems can be expensive.

Take time and browse our solar water heaters site, learn about the different stages that water goes through to become hot, the different types of solar water heater systems and even how to cost effectively build your own solar water heater system!  There are two types of active solar water systems:

(1) Indirect circulation - Pumps circulate a non-freezing, heat-transfer fluid through the collectors and a heat exchanger.  This heats the water than then flows int the home.  The indirect circulation system is especiall popular in climates prone to freezing temperatures.

Typically less expensive than the active systems are the passive heating systems.  Also the passive systems are usually not as efficient as the active systems.  However, passive systems can actually be more reliable and may last longer than the passive water systems. (2) Direct circulation systems

Pumps and circulates household water through the collectors and into the home.  They work well in climates where it rarely freezes. 

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