... kind of cost-effective vacuum tube solar water heater for changing cold water into hot water for you home, by collecting sun's ... 2000, EN-12975 Solar Keymark Certificate. Features of pressurized solar water heater:1) Outer tank: Galvanized steel sheet, surface plastic ... established in 1989. We are a leading manufacturer of Solar Water Heaters (SWH), including Compact Non-pressurized SWH, Compact ...