SRCC,KEYMARK,CE,CCC,ISO9001 Feature:l 1.Be used in split pressurized solar system. The ... .l 2.Vacuum tube solar collector with 12-14mm diameter heat pipe head,which supply higher ... thermal efficiency. l 3.No water in the pipe. If one of the pipes is broken,the heat collector ... Manifold casing material: aluminum alloyl 5.Heat channel:TU2 copperl 6.Insulating layer: ...