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  1. #1
    Join Date
    Jan 2011
    Posts
    135

    Hot water boiler making banging noise

    Does anyone have a solution on how I can fix the pipes from banging. Some of the baseboards are new and some are existing. The holes where the pipes are running through are 1 1/4 and the pipe is 3/4. The customer says the banging is occuring periodically, and I don't know what else to do, it is very difficult to see where it is coming from. I know it is the pipes hitting on the wood as they are heating. Does anyone have a good solution for fixing this or has had a similar situation. The baseboards are all on drywall with all the pipes running in between the studs. i tried shoving insulation in the holes, but it is still making noise.

  2. #2
    Join Date
    May 2004
    Location
    Frederick, MD
    Posts
    949

    Does the boiler

    supply domestic hot water or is it just used for heating?
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  3. #3
    Join Date
    Jan 2011
    Posts
    135

    has indirect tank

    has indirect tank with radiant floor heat and baseboards, the pipes bang in the baseboards, 2 rooms are original and 1 has been replaced. The system heats good all around also

  4. #4
    Join Date
    Oct 2011
    Location
    N.E. Indiana
    Posts
    879
    Let the midget out of the tank. He'll stop banging to get out.

  5. #5
    Join Date
    Jan 2011
    Location
    Boston, MA
    Posts
    459
    Is it a banging/ snapping or "expanding" noise? 2 different animals.

  6. #6
    Join Date
    Jan 2011
    Posts
    135
    it is banging according to customer, the first sound is the pipes expanding and heating up, kind of a normal ticking than goes away, and the system never does it all the time either

  7. #7
    Join Date
    Dec 2011
    Location
    Maryland
    Posts
    127
    When does this occur? Only during a heat cycle? When the customer is drawing water? Anytime? Usually tight clearances to heat pipes will give you a wood "creaking" noise. I would think your "banging" noise is being transmitted through the pipes...

  8. #8
    Join Date
    Jan 2011
    Location
    Boston, MA
    Posts
    459
    Quote Originally Posted by zuke19 View Post
    it is banging according to customer, the first sound is the pipes expanding and heating up, kind of a normal ticking than goes away, and the system never does it all the time either
    Did you check your pressure and temp?

  9. #9
    Join Date
    Jan 2005
    Location
    Littleton, CO
    Posts
    264
    Check your expansion tank. Seen a couple with bad bladders that were making noise through the system.


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  10. #10
    Join Date
    Sep 2008
    Location
    VA
    Posts
    1,762
    Trying to remember a similar issue from years ago. I believe, I found a zone valve installed backwards.
    I would also check the expansion tank, as suggested in post #9.
    "The only true wisdom is in knowing you know nothing" Socrates

  11. #11
    Join Date
    Mar 2012
    Location
    My house is in Texas..
    Posts
    141
    I had a similar problem with a steam coil.... Pipes where too small. (story of my life).

    "Duct tape is like the force. It has a light side, a dark side, and it holds the world together."

  12. #12
    Join Date
    Jan 2011
    Posts
    135
    the pressure and temperature are good, 180 deg and about 17 psi, only happens during the central heat state, not all the time and it is the pipes creaking on the wood, and it doesn't do it on all the baseboards. Has anyone ever heard of putting an expansion isolator in, sort of like a vibration isolator you would find on a refrigeration system, it would go right in the baseboard itself, this is just a thought as I do not want to tear the walls apart to find the creaking, it is in different spots, only occurs when heating up, even tried to turn the water boiler temp down so it didn't heat as much, that didn't work either. I figure since this is caused by expansion, than maybe a vibration isolator could work, just thinking out loud, never had this before. The boiler sounds good during the radiant floor, and the domestic water stages. Checked the zone valves, installed correctly

  13. #13
    Join Date
    Mar 2012
    Location
    CA
    Posts
    1
    Have you verified that the Air bleeds work and are properly installed?

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