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Heating your household water by using a solar water heating system can save you cash, conserve energy and help the environment. A plethora of solar water heating systems are on the market and can vary depending upon the type of water pump that is used. A solar water pump is just one part of a solar water heating system. Choose from three different types of pumps depending upon your water source.
Submersible Pumps
If your water source is a deep well, go with a submersible solar water pump. Submersible pumps are used for pumping wells and work well for both farming and residential purposes. A submersible pump gets its name because the pump is submerged under water and pushes water to the surface. The pumps can pump up water that is up to 650 deep. According to Absolute Astronomy, the primary "advantage of this type of pump is that it prevents pump cavitation, a problem associated with a high elevation difference between pump and the fluid surface."
Surface Pumps
Unlike submersible pumps, surface pumps are already at ground level or just above the water surface. These pumps push water to specific locations through suctioning. The surface pump suctions in water from a pond, shallow well, tank, stream or other water source, and the pump is often energized through a solar panel(s). One benefit of using a surface pump is that the solar panels and the pump do not have to be attached. Surface pumps are also more cost-effective than other types of solar water pumps.
Circulating Pumps
Solar circulating pumps are used in connection with home or swimming pool water heating systems. One benefit of circulating pumps is that they require little maintenance. In water heating systems, circulating pumps can either directly circulate water into a home through solar collectors or they can indirectly circulate water by pumping a heat-transfer fluid into a home through solar collectors and other heating devices. While direct circulating pumps are better for warmer climates, indirect circulating pumps are ideal for cold climates.