Tank materials: Inner tank: sus304 Inner tank thickness: 0.6mm Outer tank: sus 304 or colored steel Outer tank thickness: 0.37 Insulation: imported polyurethane Insulation thickness: 50-65 Heat exchanger: copper coil Pressure resistance: 0.6mpa Advanges: pressured operation. The whole system is easily integrated into the building. From outside, it looks more nice. Standard export package