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It basically uses the Sun’s thermal energy to heat water. Solar collectors fall into two general categories: non-concentrating and concentrating. These Collectors mainly consists of copper tubes that are fitted to flat absorber plates. Flat plate collectors are created mainly to contain nearly 40 gallons of water.
Evacuated tube collectors are the most efficient collectors available. The space between them is a vacuum, so very little heat is lost from the fluid. Direct systems circulate water through solar collectors where it is heated by the sun.