... 1.SRCC,Keymark,CSA,UL,SABS,CE,ISO approved 2.High pressurized 3.OEM retail available Split Pressurized ... . The heat---conducting liquid transfer heat to water by the heat exchanger in the water tank;4. ... The expansion vessel allows the fluid to safely expand by compressing the air in the chamber. Working temperature: ... Seperated pressurized solar water heater which approved by CSA,Solar keymark,SRCC,En12975