Water supply to furnace humidifier.

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by David Yates, May 23, 2020 at 9:57 AM.

  1. David Yates

    David Yates New Member

    Joined:
    Oct 30, 2014
    Occupation:
    IT Professional
    Location:
    Calgary, Alberta
    Am working with a friend and we have installed pex water supplies in his house. The new furnace came with a humidifier that has a small diameter plastic supply hose attached to the solenoid valve.

    Rather than think about a saddle valve (All pex plumbing) is there any reason I should not just use a refrigerator supply braided hose (assuming 1/4” fitting) to supply the humidifier?
     
  2. WorthFlorida

    WorthFlorida The wife is still training me.

    Joined:
    Oct 28, 2009
    Occupation:
    Retired
    Location:
    Orlando, Florida
    I'll work. Those old style plastic lines can easily crack and burst over time. It happened to my son where someone ran one through a wall cavity into the attic and down to the refrigerator. About 2K in water damages.

    I like to ask a question, On the rework using PEX, did you install it like copper with a loop around the home and tee off for the fixture or use a manifold and each fixture is on its own branch. I'm curious of the pressure at each fixture.
     
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  4. David Yates

    David Yates New Member

    Joined:
    Oct 30, 2014
    Occupation:
    IT Professional
    Location:
    Calgary, Alberta
    We just ran 3/4” to each area with water demand - bathrooms, kitchen, and then used small manifolds for each room. Self made manifold for distribution in basement. House unoccupied currently so no info on pressure but I would be amazed if it was unsatisfactory
     
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    I used soft copper to mine. Insert a T then run what you need to the humidifier. Note, depending on where the thing is, just a reminder, pex needs to be protected from UV exposure, so keep that in mind.
     
  6. Dana

    Dana In the trades

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    Jan 14, 2009
    Location:
    01609

    Is there any reason to hook up the humidifier AT ALL?

    Even in cool high-dry Calgary if the house is reasonably tight and occupied by breathing/bathing/cooking humans the wintertime indoor humidity shouldn't stray out of the human-healthy & comfortable range in winter unless the house is over ventilated.

    A high indoor humidity in winter (=>40% @ 20C) puts the structural sheathing of a wood framed house at risk. Any air leaks or large gaps in the vapor barrier ends up accumulating moisture in the sheathing, leading to potential mold/rot issues. During the coldest weather it's best to keep the indoor RH at 25-35% @ 20C, when the sheathing is well below the +3C to +5C indoor air's dew point.
     
  7. David Yates

    David Yates New Member

    Joined:
    Oct 30, 2014
    Occupation:
    IT Professional
    Location:
    Calgary, Alberta
    If it were my house I wouldn’t install one. In fact I had disconnected mine years ago. The owner of this house wants one though.
     
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