... ,and the cold water sink to bottom,then heat by solar collector.so the whole system is always circulatingcontinuously.3,The electromagnetism ... water is full,it will close the valve automaticallySeparate Pressurized Solar Water HeaterWater Tank:1,Inner tank:SUS304-2B material, ... terminator5,Heat exchanger:20m long,12mm diameter,1mm thickness coppper pipe. Feature:1,Pipeline is made of all red cooper and ...