... day, the water in the tank is gradually heatedHeat pipe solar collector technical specificatonManifold casing material: aluminumFrame material:aluminumHeader pipe material ... flat roof/inclined roofMounting angle:15-50CInlet:3/4"E Solar collector(Heat pipe series)SC-H seriesModelSC-H-15- ... 3,Structure,Gradual change SS-AL-Nx/Cu selective absorption coating,Vacuum Degree,P<=5*10-4,Service Life,10 years ...