... So the users can get the hot water from the tank.the system of solar water heater is an "Open Circuit" non-pressure system ... borosilicate glass The vacuum tube of our solar water heater has the high absorption rate and low emission rate,the absorption rate is 0 ... be choosed for this system.according to your requirement.environmental solar water heater (SOLAR KEY MARK,SRCC,CE, ISO9001,CCC) environmental ...