... tank, it could be worked in -35C degree. Heat pipe solar collector: Specification:Manifold material and thicknessA, Black or silver aluminum ... 0mmB, Stainless steel 304 2B, thickness 0.8mmHeader pipe material and thicknessDiameter:32mm, thickness 1.0mm copper pipeHeat ... thickness 2.0mmB, Stainless steel, thickness 1.2mmCollector mountingFlat roof/slope roofInlet and outlet1/2’’ OR 3/4’’Hail resistance: ...