solar water heater 1.good and stable quality 2.high efficiency 3.very competitive price TECHNICAL INFODMATION 1(compact system non-pressure)Out shell of tankGalvanized steel sheet, Surface plastic painting/painted steel, Thickness: 0.5mm/or stainless steel 304,thickness:0.5mmInsulating layerFoaming polyurethane, thickness:55mm-60mm,Thermal transfer rate :0.022w/m.kInner tankStainless steel ( ...