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Which boiler ports for adding a tankless heat exchanger to a Williamson GSA-200?

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Jells
Jells Member Posts: 642
in Strictly Steam

If I were to do this, which ports are the in and out to the coil added to for something like an Everhot? I'm getting a new install, and want to make possibly adding this in the future much easier by putting plugged tees in the appropriate ports. Seems like the condensate return and the drain D are the obvious candidates, but if there's one thing I've learned about steam, it's don't make assumptions! I would think the ports should optimally be further apart than these 2.

Screenshot 2026-02-09 133219.png

Comments

  • 4GenPlumber
    4GenPlumber Member Posts: 72

    Just get a weil mclain eg 55. If you want to add a domestic loop, you can add the coil at that time. That way you avoid using "mud" and you separate the boiler water from the domestic.

    STEAM DOCTOR
  • 4GenPlumber
    4GenPlumber Member Posts: 72

    Its the same boiler, just with the loop option (worth the money).

  • STEAM DOCTOR
    STEAM DOCTOR Member Posts: 2,561

    The Williamson has two, 2 1/2" return tappings. Only the one on the left side, shows up in the literature. But the other one is certainly there. Using a WM, with the coil, is certainly simpler, and eliminates the need for an additional circulator.

    4GenPlumber

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