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Rotting egg smell from radiant floor heating system

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Brand new home with radiant heat. 
Horrible rotten egg smell in garage and now permeating rest of house.
Any advise would be appreciated

Comments

  • Jamie Hall
    Jamie Hall Member Posts: 23,447
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    "Rotten egg" smell is usually hydrogen sulphide. There can be any number of causes of the smell, and it can be difficult to pin down. You seem to indicate that you believe that the smell is, in some way, connected with the radiant floor heating. What tests have you performed so far to demonstrate that it appears only when the floor heating is turned on?
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • kcopp
    kcopp Member Posts: 4,443
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    Is there a trap in the garage that may have dried out?
    Alan (California Radiant) ForbesGroundUp
  • Sharone
    Sharone Member Posts: 6
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    We were instructed to turn up heat. That made the smell worse. 
    There is not a drain or not aware of a trap.
  • Jamie Hall
    Jamie Hall Member Posts: 23,447
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    Ah. Well, it's most likely NOT the heat -- but something possibly in the garage being warmed up by the heat. Don't overlook anything -- and don't get focused on just one possibility.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    Alan (California Radiant) Forbes
  • HVACNUT
    HVACNUT Member Posts: 5,865
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    Is there radiant heat in the garage, or is the boiler or manifolds in the garage? Neither? Both?
    What type of boiler? Was a combustion test done at startup?
    You are getting odors with the heat off but it gets worse when the heat is on? 
    What's the supply water temperature setting?
    Antifreeze leak?
    Air handler or any exhaust or venting running from the garage to the house or attic?
  • GroundUp
    GroundUp Member Posts: 1,926
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    Can you share a photo of the heating system in question?
  • Sharone
    Sharone Member Posts: 6
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  • Sharone
    Sharone Member Posts: 6
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    Here are a few photos, the hot water tank is in between these two
    I'm afraid I'm in over my head here.
  • kcopp
    kcopp Member Posts: 4,443
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    There is a trap in the Pict to the left.
    Black thingy, has a clear hose going into it.
    The condensate pump dumps into it... although it looks pretty dry.
    Pour a pint of water into it.


    Larry WeingartenGroundUp
  • Sharone
    Sharone Member Posts: 6
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    Hmmm, I was just going to post this picture stating I found the trap. I'll try adding water right away
    Thank you Kcopp
  • hot_rod
    hot_rod Member Posts: 22,263
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    looks like you are on a well? Could it be the water you smell?
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • HVACNUT
    HVACNUT Member Posts: 5,865
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    The condensate pump isn't even needed. Just pipe the drain on the boiler directly to the trap. Check the manual as that drain might need to get trapped. That will eliminate stagnant water sitting in the basin of the pump. 

    When the boiler was commissioned, there should have been a combustion test done. Do you have the results?
  • KC_Jones
    KC_Jones Member Posts: 5,742
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    Is this natural gas or propane? If natural gas the additive (mercaptan, or methanethiol) makes it smell like rotten eggs. Have you eliminated a gas leak as a possibility?
    2014 Weil Mclain EG-40
    EcoSteam ES-20 Advanced Boiler Control
    Boiler pictures updated 2/21/15
    SharoneHomerJSmith
  • JUGHNE
    JUGHNE Member Posts: 11,077
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    Car battery over charging can produce some smells similar to this.
    SharonePC7060
  • Sharone
    Sharone Member Posts: 6
    edited September 2023
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    It wasn't the p trap. Thought it was. I put water in it. Smell went away but it's back in less than 24 hours.
  • GroundUp
    GroundUp Member Posts: 1,926
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    Did you try putting more water in? Or dipping something in there to verify it's not the trap? I've seen buildings with improper pitch and/or venting, where it would suck traps dry elsewhere in the system when toilets were flushed.
    kcopp
  • Jamie Hall
    Jamie Hall Member Posts: 23,447
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    If that cute little P trap is inadequately vented, it will get pulled dry every time someone flushes a toilet. So it may still be the P trap. Wouldn't be surprised.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    SharoneGroundUp
  • hot_rod
    hot_rod Member Posts: 22,263
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    The P trap doesn’t look new? If the smell is, something else may be going on

    A small gas leak, or backfire on ignition. Eat enough to soap the gas line fittings 

    Water leaking from the boiler anywhere? It can have a smell like that. 
    Iron bacteria in a heating fluid smells like rotten eggs 

    Anode rod building gas in the domestic hot water?

    Sulfur water from the well?
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    Sharone