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  1. #1
    Join Date
    Sep 2014
    Location
    California
    Posts
    19

    Default Hot/Cold Mystery

    Fittings under a bathroom sink. My best guess it has to do with the hot/cold lines entering from a tankless water heater. Your view appreciated.

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  2. #2
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    26,248

    Default Re: Hot/Cold Mystery

    Farthest bathroom from the water heater?

    May have been an autocirc (or similar) when there was a standard storage tank type water heater installed. Those are designed to keep hot water at or close to the point of use to save from having to run gallons of water to get hot water to the sink.

    Another possibility is that is a tempering valve which keeps the hot water from getting too hot (it mixes cold water with the hot water so the hot water is not scalding hot).

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  3. #3
    Join Date
    Sep 2014
    Location
    California
    Posts
    19

    Default Re: Hot/Cold Mystery

    Thanks, Jerry.
    Yeah, I'm guessing tempering mixing valve. I have one on a shower. Keeps hot water from scalding.
    Close match pictures on Granger site.
    Best to you.
    Don


  4. #4
    Join Date
    Mar 2007
    Location
    Columbus GA
    Posts
    3,746

    Default Re: Hot/Cold Mystery

    All (2) tempering valves I've seen have Hot in Cold in and Mixed out piping.

    ' correct a wise man and you gain a friend... correct a fool and he'll bloody your nose'.

  5. #5
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    26,248

    Default Re: Hot/Cold Mystery

    Quote Originally Posted by Rick Cantrell View Post
    All (2) tempering valves I've seen have Hot in Cold in and Mixed out piping.
    Looks like that valve has three connections: left, right, bottom into wall ... looks like ...

    - - - Updated - - -

    Quote Originally Posted by Kevin Wood View Post
    Auto circulation has nothing to do with a mixing valve.
    I don't recall anyone saying they did? ???

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

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