... & pressurized 3. 15 Years Warranty for vacuum tube solar water heater featuresa. Module design, arbitrary combination, harmonize with ... the anti-freezing liquid as the medium and the controller hasthe anti-freezing functiond. Multifunction: bathing, washing, domestic ... degrees centigrade9) Water capacity: 150L, 200L, 250L, 300L, 500L 10) Pressure: 6 Bars11) Daily efficiency: >= 55%(>=42% in winter ...