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Boiler not holding pressure

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lisap
lisap Member Posts: 9
in Radiant Heating
Just had a brand new boiler put in a month ago. Not holding pressure. Rep came out and topped off the water. Held for a couple days than down to zero again. Any ideas what the issue is. Base board heaters are heating. 

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  • Jamie Hall
    Jamie Hall Member Posts: 23,373
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    Hot water? Fully purged?

    Somewhere you have a leak It may or may not be in the boiler.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    lisapIronman
  • lisap
    lisap Member Posts: 9
    edited December 2023
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    Yes have hot water. When they came out, he just added water . Never purged.  Should that be done. If a leak. How do I find leak?


  • HVACNUT
    HVACNUT Member Posts: 5,844
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    Where is the boiler?
    Is the house on a slab, crawlspace, basement?

  • lisap
    lisap Member Posts: 9
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    It is in the lower level of home on slab 
  • lisap
    lisap Member Posts: 9
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    Is this something the installer should need to troubleshoot since just installed brand new
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,573
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    Yes. The installer should be responsible to find the problem. It may or may not be his responsibility to repair whatever is wrong......It depends on what you bought.

    If he used the old expansion tank or water feed valve etc and that wasn't included as new in his quote they you would be responsible for that.

    Not holding pressure on a new boiler is seldom a boiler leak. It may be he did not purge the system of air or bleed it properly (that IS his responsibility if he changed the boiler), could be a bad expansion tank or a defective water feed valve. It could be a leak in the system but you ould probably notice water somewhere.

    The system should be pressure tight. A hot water system should not need water to be added to it.
    lisap
  • HVACNUT
    HVACNUT Member Posts: 5,844
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    lisap said:
    It is in the lower level of home on slab 
    It could be air bubbles being vented and losing pressure because the feed valve is closed. But it could also be a slab leak.
    Can you hear water running through the pipes when the heat is on? You shouldn't. 
    lisap
  • SgtMaj
    SgtMaj Member Posts: 76
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    Why did you have the boiler replaced?
  • lisap
    lisap Member Posts: 9
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    I replaced the whole system because the old one was red flagged. Don't see water anywhere.  How do they search for slab leak? Sounds like a nightmare as just bought brand new. Old boiler worked fine.
  • lisap
    lisap Member Posts: 9
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    Dumb question. When they were called out. He saw zero psi. Added water and did nothing else.  Should he have done more. Purge?? In your opinion.
  • hot_rod
    hot_rod Member Posts: 22,201
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    It can take a week or more to get all the air purged out via the systems purger.
    When air comes out, water needs to be added somehow. Either manually or by an autofill valve.

    You should not need them to come back if you have a fill valve that is working.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    lisap

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