separate solar water heater 1.Guarantee:15years 2.Quality for EU market 3.CE,Keymark,ISO certificate 4.Manufacture separate solar water heaterWater Tank:1,Inner tank:SUS304-2B material,150L-200L1.2mm thickness,300L-400L1.5mm2,Insulation:50mm polyurethan foam3,Outer tank:0.5mm thickness galvanized steel material4,P/T relief valve ,electrical heater element with terminator5,Heat exchanger:20m long, ...