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Thread: Hot Water Issue

  1. #1
    DIY Junior Member smangold's Avatar
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    Default Hot Water Issue

    I hate to ask this question because I do see similar ones posted, but here goes...

    I have a Weil McLain WTGO 3L oil boiler that supplies baseboard heat and domestic hot water. Over the past several weeks we have gone from having an ample supply hot water to a trickle of lukewarm water (at best). We actually need to run the shower for 10 minutes before the water warms up. Even then the supply is short lived.

    I think I narrowed the problem to two areas (the mix valve or coil).

    The mix valve is leaking and corroded. I originally thought that the corroded valve was mixing in too much cold water. However, I decided to do further research on the subject before I replaced it.

    While reading older posts, I came to the realization that it could possibly be a bad coil (an idea that I'm leaning towards). Last night while running the shower I touched the hot water line coming from the coil and was able to hold my finger there for several seconds without getting burnt. I assume that under normal circumstances I wouldn't be able to do this, correct? It now seems that warm water is being mixed with cold water.

    Does the issue above sound like a bad coil? I wanted to seek expert advice before I spent the $200 for a replacement.

    The mix valve needs to be replaced regardless...

    Thank you in advance for your advice.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    It could be the aquastat...what temp is the boiler at when this happens?
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Junior Member smangold's Avatar
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    Default

    Right now (shower running) the temp is 180. Same thing as usual. I can put my finger on the water line exiting the coil for a few seconds without getting burnt.

    Psi seems to be low, a little under 20.

  4. #4
    Retired Defense Industry Engineer jadnashua's Avatar
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    Internal coils can be problematic and only work on relatively low-flow situations...think hand through a candle flame...move it fast and you never notice.

    You may be better off spending money on an indirect WH, which operates as a separate zone on the boiler.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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