... water in the tank is gradually heatedHeat pipe solar collector technical specificatonManifold casing material: aluminumFrame material ... :10 barCollector mounting flat roof/inclined roofMounting angle:15-50CInlet:3/4"E Solar collector(Heat ... ,High boron and silicon content 3.3,Structure,Gradual change SS-AL-Nx/Cu selective ... <=5*10-4,Service Life,10 years Mounting FrameAluminum Alloy,Thickness,1.8 mm, not ...