... can be from 1000L-30000L Split Pressure Solar Water Heater:Vacuum tubes assimilate the advance 12 layers ... coating, through the inner layer , vacuum has an unique effect of thermo, with its temperature up to ... strong heating ability, Certificate, CE, CCC, ISO 9001, Solar Keymark.Features:1) Highest efficiency2) Furnished in good style ... ) Isolation: 50/55 polyurethane Split Pressure Solar Water Heater