... certification:ISO9001,ISO14001,CCC,CE,Solar Keymark 2.solar water heater:heat pipe tube 3.pressure:press Solar water heater: material:1.volume of ... storage tank:120L,180L,240L,300L2.pressurized water tank: insulating layer ... dust ring gasket :EPDM4.evacuated tube:three-target tube,high boron and silicon,content 3.3,structure,gradual change SS ...