... pressurized 3. 15 Years Warranty for vacuum tube solar water heater featuresa. Module design, arbitrary combination, harmonize with ... liquid2) Temperature preservation is equipped with standard electric water heater setting,automatic temperature control exchanger, and increased ... ) With heat pipe: anti-freezing > -35 degrees centigrade9) Water capacity: 150L, 200L, 250L, 300L, 500L 10) Pressure: ...