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Solar water heaters Solar Water Heater (Solar water heater) refers to the solar energy to heat the water heater. With the gas water heater, electric water heaters in parallel with one of the three water heaters. Introduction Solar water heaters to solar energy into heat energy, heating the water from the low temperature to high temperature, to meet people in life, the production of hot water use. Solar water heater is all glass vacuum collector tube, tank, stand and the relevant annexes to rely mainly on solar energy into heat energy glass vacuum tube. Collector tube surface by the sunlight, high temperature, collector tube rear sun surface temperature is low, while the pipe water temperature response arises, use cold water sinking floating principles, so that water will achieve the required micro-circulation of hot water. Work Operating principle of solar water heaters: An endothermic process Solar radiation through the glass cover, is absorbed by the collector and the wall along the fin tube is passed to the heat-absorbing water. Endothermic endothermic pipe after the water temperature, decreasing the proportion rose to form an upward impetus to form a thermal siphon system. With the continuous upward water and stored in tank top, while circulating through the tube under low temperature of the water constantly added, so the cycle, the final FCL water is increased to a certain temperature. Existing Flat-Plate Collector, basically by combining a good combination of multiple methods, such as rolling or pressing methods, which take the water between the child and the endothermic board thermal resistance is almost negligible. Flat plate collector affect the core performance of the main factors, first, structural design, and second, the surface absorption coating. Well-designed collector's plate with fin efficiency should be 93%. Collector plate efficiency and plate fin core core structure, surface treatment and the overall structure of the collector. Collector overall structure of the overall heat transfer coefficient can be described, its influence and its own geometry (rib thickness, material) are the same. That is, in the case of equal efficiency, collector plate core heat loss an hour can be thinner. Selective absorption of the surface can improve the collection efficiency, but the market these products to enhance economic efficiency, often thin fin. Occasion for the water heater when the effects of these products and the selectivity of the actual collector worse (not even optional), but fin thicker collector will not be much difference.