solar water heater: 1.SRCC,Keymark,CSA,UL,SABS,CE,ISO approved 2.High pressurized 3 ... makes them superior heat performance. 2. Wide applicable range: as the heat pipe has less heating space for medium, it ... day. It can work normally even in -40degree centigrade. As no water flows in vacuum tube, it can avoid ... Seperated pressurized solar water heater which approved by CSA,Solar keymark,SRCC,En12975