The meaning of ETC is Evacualeted tubes collector .
The ETC Solar water heater is the type of solar water heater . The tubes are made from glass material which is borosicate powder used for producing the vaccume on it. Zinc powder used for 3.3. Layer coating
The various size of tubes are availabel i market like 58*1800 mm,58*2100mm,47*1800mm,47*1500mm,70*2100 mm s.
ETC solar used more than 90% sun rays .its absorbs and convert it in heating
Nice
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