... solar water heater 2:Aluminum Alloy frame 3:CCC,CE,ISO9001:2000 4:Produce as customer's requirment Non-pressurized solar water heaterSpecifications1.Solar ... OEMIt is one of the most common used solar water heating system for household, hotel, hospital, ... ) Tank diameter: 46eter: 46eter: 460mm9) Pressure: 0Pa10) Heat preservation: 72hrs11) Hail resistance: 25mm Non-pressure Compact solar water heater