... heater 1.High pressure 2. Heat pipe vacuum tube 3. ISO, CE, CCC 4. SUS304 inner tank, 2 copper coils Split solar water ... extremely cold areas.1. It can withstand pressure of tap water when it works, working pressure 0.6MP.2. Completely automatic operation ... ,150L,200L,250L,300L,400L,500L. Domestic 2 copper coils high pressure Split Solar Water Heater