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Features: 1) pressurized solar system 2) the pressure of hot water is the same as tap water 3) us copper coil exchange heater Features:1) The vacuum tube adopts the three-layer heat collection techniques: higher heat-getting efficiency, reducing the water-stagnation2) It can withstand the pressure from tap water (0.6Mpa)3) Parabolic surface internal bladder: higher pressure-supportive capability4 ...