Evacuated Tube Collectors
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India gets 300 days of sunshine. Solar water heater takes care of all the water heating requirements in the household. Evacuated tubes collectors solar water heating system, is comparatively new form of technology in India.
The technology behind the evacuated tube is based on the principle of common thermal flask, where a vacuum prevents heat loss through conduction and convection. ETC water heaters heat the water to ~ 600 C.