... Inner tank:SUS 304-2B 2.Outer tank:Galvanized steel, 3.Bracket:Galvanized steel pressurized heat pipe solar water heatersell pressurized solar water ... 1.Inner tank:SUS304/ 2BFood Grade stain steel ,0.4mm 2.Outer tank:Galvanized steel,0.4mm,diamater of water tank:460mm ... 3.Insulation layer:50mm high dense integral polyurethane foam4.Bracket:Galvanized steel ,1.2mm,1.5mm.Angle:20-50degree. 5.Vacuum ...