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Weil McLain gas baseboard hot water (with domestic coil) not providing enough heat

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Multiman
Multiman Posts: 38
in Gas Heating

Functioning as it should, baseboards getting warm, but not getting apt warm enough, even though it's only about 50 F out. Can I set the water temp higher to get more heat?

Comments

  • mattmia2
    mattmia2 Posts: 18,107

    Is the boiler temp at the setpoint of the aquastat? I suspect you have some other problem like a circulator that isn't running so you are only getting gravity circulation or a system that is air bound so you aren't getting proper flow.

  • Multiman
    Multiman Posts: 38
    edited November 2025

    I know that the circulator had to have been working, because before we replaced the 3 way valve, the heat was running nonstop and it was very hot in the apt, so it must have been working. Also, it is not making a noise. So I doubt that it's the circulator pump. Next step I guess is to drain and refill the pipes, to rule out them being airbound.

  • mattmia2
    mattmia2 Posts: 18,107

    so you replaced the 3 way valve and it stopped working.

    what does this tell us?

  • mattmia2
    mattmia2 Posts: 18,107

    and what 3 way valve? is this a combi mod con?

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