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The characteristic of U Pipe Collector 1) The vacuum tubes absorb the solar energy and transfer into the heat energy, then pass it to the U pipe,it can get high temperature..2) There is no water in the vacuum tube,so the tube will not break in the winter. 3) It is steady and credible. 4) It can be combined with the architecture perfectly. 5) It can be combined with existing pipeline. 6) It can be still operate in the event of occasional tube breakages