... 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 pressurized solar water heater ... more comfortable. 3) It can produce hot water with constant temperature, it is safe and comfortable ... ,thickness:50mm-60mm Pre-heated solar water heater(CE, CCC, ISO9001:2000)