1. Separate Solar water heater, high pressure 2. Heat pipe vacuum tube 3. ISO, CE, CCC 4. SUS304 inner tank, ... extremely cold areas.1. It can withstand pressure of tap water when it works, working pressure 0.6MP.2. Completely automatic operation ... the days without sunshine hot water can also be used.8. Capacity:100L,150L,200L,250L,300L,400L,500L.