... freezing, ISO,CCC, Keymark & CE approval Separated Pressurized Solar Water Heater, split solar water heater, solar water heater, ISO,CCC, Keymark & CE approval1, Working principle ... heat-conducting liquid circulate automatically 3)Heat-conducting liquid transfers heat to water by heat exchanger in the water ... in the event of occasional tube breakages.System controller has the anti-freezing function, ...