Inner tank: sus 304 Inner tank thickness: 1.2mm Outer tank: sus 304 Outer tank thickness: 0.31 Insulation: polyurethane imported from south korea Insulation thickness: 50-65mm Frame: sus430 Frame thickness: 1.5mm Pressure parameter: 0.6mpa Conducting materials: heat tube Advantages: for the pressured operation, got more rushed hot water while bathing. Even one vacuum tube broken, the whole system can go on working. Standard export package
