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 Specifications:1 ) . Inner tank material: SUS304-2B, thickness: 0.5mm  2)    Outer water shell: imported the zinc aluminum stainless steel plate   3)    Vacuum tube: 12, 15, 18, 20, 24, 30 and 36 pieces of tubes are available, over          15 years service life 4)      Vacuum tube size: 47X1500mm 5)     Insulating layer: polyurethane foam, thickness: 50mm, 55mm, 60mm available 6)      Tank diameter: 420mm 7)      Capacity: 117L- 460L Features:1)    The product uses super heat conduction pipe and has a good effect of heat exchange 2)    Collector separates with the storage tank. The tank can be put anywhere of the       house 3)    The pipe is made of purple copper and conducted by heat transfer medium liquid;    &