... CE and Solarkeymark certificates,SUS316 inner tank,Anti-freeze system Working Principle of Seprate pressurized solar water heater:The key of this ... tank exceed the set value, The controller inside solar working station will start the circulation pump, the cold water ... SUS304-2B/SUS316L6) Pressure tank passed CE certificate7)can working under -35C degree cold weather8)Solar collector and pressure ...