... ,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,polyurethane ... .dust ring gasket :EPDM4.evacuated tube:three-target tube,high boron and silicon,content 3.3,structure,gradual change SS ...