The characteristic of Pressurized solar water heater 1)Humanized design, no water directly flowing in the tubes, enabling the system still workable in case of occasional tube breakage. 2)Completely automatic operation with intelligent controller. 3)Antifreezing, all-year-round service even in extremely cold area. 4)Adopting the best conduction performance metal- copper TU1(heat pipe). 5)Directly connected with city water without a circulation pump 6)Withstanding high pressure (0.6MPa), comfortable shower. 7)No Glycol, No Chemicals! The details of material: Heat-pipe vacuum tube: Borosilicate glass 3.3, ALN/AIN-SS/CU coating, wall thickness 1.6mm / 2.0mm / 2.3mm. Heat pipe inside the tube. Φ58mm×1800mm. Inner tank: Food grade SUS304-2B stainless steel, thickness 1.2 mm, diameter: 470mm. Outer tank: Colored / Enamel / Stainless / Fluorine carbon steel with optional 0.4mm and 0.5mm in thickness, diameter: 360mm. Insulating layer: High density, one-off molding polyu