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why two circulators here

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  • why two circulators here

    The burnham gas boiler manual has a piping diagram as attached. My plumber did not explan clearly to me why we need a boiler circulator here and also with supply and return connected each other. It looks to me the zone circulator will compete with the boiler circulator otherwise the water will just loop near the boiler.

    another non-professional member here has the same question: http://www.ridgidforum.com/forum/showthread.php?t=29244

    anybody can tell us
    1. why need the boiler circulator?
    2. return and supply are connected together?
    3. how hot water can go to zone but not loop near the boiler?

    thanks,
    Attached Files

  • #2
    Re: why two circulators here

    a better attachment
    Attached Files

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