Separate Pressure Water Tank Inner Tank:SUS304/2B,2.0mm Outer Tank:Galvanized Steel Alloy,0.4mm Insulation:Polyurethane,50mm MaterialInner tank: Imported stainless steel (SUS304/2B ... , Germany)ThicknessInner tank: 2.0mm Outer tank:0.4mm Bracket: 1.5mm Heat insulation layer: 50mm Separate Pressure Water Tank With Copper Coil, Solar Energy Water Tank