... 3.No pressurized Solar water heater factory Non pressurized Solar water heater specification Characteristic1. ... heater.5.Max. Pressure: 12bar; Operating Pressure: 6 bar.6.It can be used for other function, such as ... 55mm imported PU.4.Copper coil:15m each, diameter ... heat-collecting tubes,fast heat absorbing and temperature risen Heat Preservation Layer: 50mm polyurethane integral foaming, superior heat ...