Solar water heating is a reliable and renewable energy technology used to heat water. Sunlight strikes and heats an absorber surface within a solar collector or an actual storage tank. Either a heat-transfer fluid or the actual potable water to be used flows through tubes attached to the absorber and picks up the heat from it (systems with a separate heat-transfer-fluid loop include a heat exchanger that then heats the potable water.) The heated water is stored in a separate preheat tank or a conventional water heater tank until needed. If additional heat is needed, it is provided by electricity or fossil-fuel energy by the conventional water heating system.
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Solar water heating systems can be used effectively throughout the United States at facilities that have an appropriate near-south-facing roof or nearby un-shaded grounds for installation of a collector. A variety of building types can take advantage of solar water heating systems including swimming pools, residences, hotels, laundries, hospitals, prisons, and kitchens. Solar water heating systems are most cost effective for facilities.
Solar thermal system is very cost effective and can be used in various ways. Solar hot water also have some industrial applications like to generate electricity. Designs suitable for all climates are much simpler and cheaper. And also it can be considered as a technology for all kind of places. The global solar thermal market is dominated by China, Europe, Japan and India.