high pressure with the copper coil for hot water consumption solve the scale problem from bad quality water. anti-freezing design high performance of the heat exchanger Superior heat preservation with 50 - 65mm polyurethane tank insulation Outer tank material: stainless steel plate or powder coated color steel sheet Inner tank material: a) 0.5mm thick SUS304 food grade stainless steel plate b) High purity copper for the heat exchanger coil Frame material: 1.2mm thickness of zinc foled sheet or alumium frame system may connected in series to increase water heating capacity Easy plug-in installation |