... heat pipe solar water heater 1. Inner tank:SUS 304-2B 2.Outer tank:Galvanized steel, 3.Bracket:Galvanized steel pressurized heat pipe solar water heatersell pressurized solar water heater system ... Galvanized steel,0.4mm,diamater of water tank:460mm 3.Insulation layer: ... resistance: 25mmsell pressurized solar water heater system with good qualityCertificate:SGS,CE,CCC,Solar Keymark,SRCC,ISO9001 ...