... CE,Solar Keymark 2.solar water heater:evacuated tube 3.pressure:non-press Solar ... new energy: material:1.volume of storage tank:120L,150L,180L,240L,300L2.non-pressurized water ... gasket :ABS4.evacuated tube:three-target tube,high boron and ... booster as to provide hot water without sunshine.3. ... ,holiday residences.5.water introduced into vacuum ...