... 15 Years Warranty for vacuum tube heat pipe solar collector solar water heater features:a. Module design, arbitrary combination, ... liquid2) Temperature preservation is equipped with standard electric water heater setting,automatic temperature control exchanger, and increased ... station8) With heat pipe: anti-freezing > -35 degrees centigrade9) Water capacity: 150L, 200L, 250L, 300L, 500L 10) Pressure: ...