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Solar Water Heating(SWH) is the Conversion of sunlight into renewable energy for water heating using a solar thermal collector.

Solar Water Heating systems comprise various technologies that are used worldwide increasingly.The Most Efficient and Advanced solar water Heating System Evacuated tube collector of two concentric glass tubes which are fused together at one end the inner tube is coated with a selective that absorbs solar energy well but inhibits rediative heat loss, the air withdrawn(“Evacuated”) from the space between the two glass tubes to from a vaccum, which eliminates conductive and convective heat loss, these tubes perform very well in overcast in overscast conditions as well as low temperatures.