... collector 2.pressurized water tank. one copper coil or two copper coil inside. 3.work station The whole system is mainly combined ... heating system will be activated to provide adequate hot water.Advantages:1) Integrated with the buildings: collectors and tank separated, make solar heaters ... -12, SH-15, SH-18, SH-20, we have had Solar Keymark certificate. Split pressure solar water heater