... heat pipe solar water heatersell pressurized solar water heater system for home use with good price .1.Inner tank:SUS304/ 2BFood Grade ... 4mm,diamater of water tank:460mm 3.Insulation layer:50mm high dense integral polyurethane foam4.Bracket:Galvanized steel ,1.2mm,1 ... ,SRCC,ISO9001 certificate.We offer 0.8% vacuum tubes for free for exchange in case several shattered vacuum tubes during transit