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SOLAR WATER HEATER Solar Water Heater Evacuated Tube Collector is made of double layer borosilicate glass tubes evacuated for providing insulation. The outer wall of the inner tube is coated with selective absorbing material. This helps absorption of solar radiation and transfers the heat to the water which flows through the inner tube. Advantages When comparing peak efficiency levels it may seem that there is little difference between flat plate andevacuated tubes, in fact flat plate may actually be higher, but this is during minimal heat loss conditions.When averaged over a year evacuated tube collector have a clear advantage. The key points are:
