... intro.The U pipe collector mainly includes: vacuum tube, U copper pipe model, aluminum fin, collector frame.The selective coating of the ... The liquid (usually a glycol-water antifreeze mixture) in the copper U tube will be heated, and conducts the heat energy ... / Painted metal2) Material of collector frame: aluminum alloy3) Coil material: copper 4) Water capacity: 150L, 200L,300L, 450L,5) Pressure: 0 ...