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black specks

  1. Tankless - Black Soot Problem

    General DIY Discussions
    Hello All, Im new to this forum and have a question - Can anyone comment why is there black soot (or black specks) that could be coming from coming hot water line? Client lives in Chicago area, Eternal Tankless waterheater model GU145S installed December 28 2010 (2.3 years ago). Background -->...
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