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Piping Replacement Boiler

Mark Eatherton
Mark Eatherton Member Posts: 5,853
All pumps MUST pump away from the expansion tank, and or the expansion tanks location, which would include the piping near the boiler. Follow the manufacturers drawings and you will have no problems.

It's worth the time, effort and money to move the main house circulator.


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  • Cliff Brady
    Cliff Brady Member Posts: 149
    Piping Replacement Boiler

    I have a boiler replacement for a client. An old CI energy hog. It's been in the talk for over an year, finally narrowed it down to a Knight.
    Current arrangement on boiler is circulator pump towards boiler. I plan on P/S, with primary pumping towards new boiler and away from Ex.tank. I guess my question is a there any problems with leaving existing circulators in the return lines of newly created secondary. Manual shows circulators in supply lines. But that could pose a problem with actual location on Ex. tank. Thought about hydraulic separations also.
    Thanks Jack
  • Brad White
    Brad White Member Posts: 2,398
    Not just move

    the main house circulator, but take the opportunity to take stock of what actual flow rate you need. The cost of a new more efficient circulator versus moving an old one, is minimally different. The operating cost is likely to be appreciably lower (using old gravity-sized piping for one thing) and that savings goes on for the life of the system.

    At least look at it.
    "If you do not know the answer, say, "I do not know the answer", and you will be correct!"

    -Ernie White, my Dad
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