1 solar water heater 2 CE,SRCC,ISO,SK,SABS 3 Elaborated designing 4 OEM available 5 non-pressured water heaterCompact non-pressured solar water heaterSolar collect technical parameterVacuum tube 47mm-1500/58mm-1800mmInner tankStainless steel:thickness0.4mm/ 0.5mmOuter tankImported color steel/ imported stainless steel/ imported zinc aluminum steel plateHeat preservationImported polyurethane foam ...