pressurized solar water heater pressure and anti correction no pollution,easy installation ... , capacity optional: 100L,150L,200L,240L,300L18, working temperature: 90 degree19, cold resistance: -38 degree20, easy ... tube gets minus 400º C for having good low-temperature-resistance. 4. Heat pipe owns super thermal ... of tube: 1800 mm Pressure: 0.6 Mp Temperature in winter: 50°C Temperature in summer: 70°C ...