... 1.Pre-heated solar water heater(CE, CCC) 2.compact solar water heater 3.8KGS copper coil inside water tank Pre-heated solar water heater ... (pressurized solar water heater with copper coil),the characteristic of ... 1.5mm; 5) Insulation: polyurethane foaming,thickness:50mm-60mm Pre-heated solar water heater(CE, CCC, ISO9001:2000)