... 2. easy installation 3. CE ISO certificate Seperated pressurized solar system Features: 1) inner tank: stainless steel thickness 1 ... as the medium and the controller has theanti-freezing funiction D. Multifunction: Bathing, washing, domestioc heating etc. E. ... element heat tube, borrosilicate glass 3.3 7) Solar working station: Controller, Circulation pump, expansion tank 5L-8L, manometer,flow-meter, ...