... solar water heater system11.Ideal for commercial solar water heating applications.Heat pipe solar collector work principle 1.The ... of Tube1800mmOuter Diameter of Tubeφ58mmTube Quantity1518202430Manifoldcasing material,Aluminum Alloy,Thickness,1.8mm,Insulating layer,compressed rock woolHeat Pipe ... P<=5*10-4,Service Life,10 years Mounting FrameAluminum Alloy,Thickness,1.8 mm, not have back-leg Rack ...