solar water heater 1.ISO, CE, CCC approved 2 ... 12mm diameter, 1.0mm thicknessDescriptions: DescripitionPre-heated solar water heaterMaterial of out tank0.4mm thickness white color plateMaterial ... of tank:5 holes for air vent,overflow,water inlet and outlet,electric heaterWelding:Argon arc ... advantage of the tap water pressure, it is easy to operated and install3.The water can be heated rapidly, ...