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WTGO COIL Leak

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Robert_H
Robert_H Member Posts: 335
in Oil Heating

GotGot called and for another problem on this boiler. But noticed the evidence of leaking from the coil area. I was initially thinking that someone just didn't do the follow-up tightening, all these bolts seem to be tight. But looking at it it looks like the gaskets not installed but I can't imagine that water wouldn't be spraying out everywhere if the gasket wasn't installed. What do you think?

The nuts are tight.

1000009398.jpg 1000009397.jpg

Comments

  • mattmia2
    mattmia2 Member Posts: 17,584

    someone might have made their own gasket such that it doesn't stick out or used permatex or gasket shellac.

    Robert_H
  • Robert_H
    Robert_H Member Posts: 335
    https://forum.heatinghelp.com/discussion/comment/1899988#Comment_1899988

    That wouldn't surprise me. as you can see from the PEX they took a lot of short cuts. There are no isolation valves at all to do any supply side work I have to secure the house supply…

  • pecmsg
    pecmsg Member Posts: 7,324

    tighten the bolts?

  • Robert_H
    Robert_H Member Posts: 335
    https://forum.heatinghelp.com/discussion/comment/1899990#Comment_1899990

    like i said "The nuts are tight."

  • Jamie Hall
    Jamie Hall Member Posts: 27,604

    There should be some sort of gasket there, although it might be thin. Sort of off topic, but did they even use the correct bolts? I've always liked to have three threads visible — but that is automotive and aircraft, so maybe it's OK here?

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 20,566

    There is only one way to find out. Hopefully the face of the boiler casting is not damaged.

  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 12,557
    edited 2:47AM

    I’m not a fan of that installer. Whoever connected the flexible tubing directly to a 90° adapter, without providing any practical way to service the coil, did a very poor job.

    I doubt there is even a mixing valve of any type installed on that tankless coil. If you want to do right by the customer, you may want to show them the manufacturer’s instructions for connecting the domestic hot-water piping. You could then quote a price for replacing the gasket and reconnecting the piping properly, including the installation of a mixing valve.

    EDIT:

    This is from the instruction manual regarding how to connect the potable water piping. I have added some valves in color and also painted the mixing valve green in order to understand and see it easier. That part is not included with the boiler and must be purchased separately, and installed as indicated in the instruction manual.

    Screenshot 2026-07-13 at 10.21.20 PM.png

    This information is on page 23 of this manual: Weil McLain WTGO boiler.

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

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