Product DesciptionInner tank material: SUS304-2B stainless steel. Available thickness is 0.25-0.5mm Outer tank material: Color chromed steel or galvanized steel or stainless steel. Available thickness is 0.25-0.5mm Vacuum tube: 58x1800mm/58x1500mm/47x1800mm/47x1500mm Material: High borosilicate glass, three-layer coated vacuum tube. Over 15 years service life. Hail resistance: 25mm Insulation layer: High density polyurethane foam. Available thickness is 50-60mm Very popular tank capacity in present markets is 100-300L. But we can produce less than 100liters Frame: Galvanized steel or stainless steel or aluminum alloy. Frame shape is according to the house roof shape Frame angle is according to the latitude.