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Our 83 yr old hot water heating system has started moaning just as it ends the heating cycle. sometimes it can moan for more than 35 seconds! Any ideas?

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  • louguy792 May 25, 2011

    The boiler is only 15 years old and was cleaned and serviced 2 yrs ago. The sound seems to come from the manifold of pipes just above the furnace before they run across the open ceiling of the basement

  • louguy792 May 25, 2011

    The boiler is only 15 years old and was cleaned and serviced 2 yrs ago. The sound seems to come from the manifold of pipes just above the furnace before they run across the open ceiling of the basement


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The moaning is something moving as the heater cools after it shuts down... it could be a pipe moving through a tight spot in a partition or just a couple of parts of the boiler rubbing together...finding the exact source could be very difficult...
Try to pin down where the noise is coming from and see if you can readjust something to decrease the friction that is causing it.

If the sound is coming internally from tthe boiler then the noise is because of a build up of over heated mineral inside the boiler. The boiler will build up mud and mineral over the years and then the burners superheat it as it trys to heat the water...
In this case the noise is an indication that the mineral build up is getting to serious levels and that the boiler may fail soon because the mineral will insulation the boiler casting from the water and there overheat and fatigue, causing it to crack....

Cleaning a boiler out that is this far built up is impossible is most should make plans to replace it soon.


Posted on May 25, 2011

  • D. Floyd Kolb
    D. Floyd Kolb May 26, 2011

    The pipes are moving slightly asthey cntract and cool ...nothing to worry about just annoying ...if you can get something between the pipe hanger and the pipe to stop the noise


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