Weil-McLain WM97+ - Leaking Clean Water from Internal Expansion Tank

Discussion in 'Boiler Forum' started by indigo, Nov 14, 2020.

  1. indigo

    indigo New Member

    Joined:
    Dec 18, 2013
    Location:
    Pittsburgh
    Title says it all -- ~6 year old WM97+ with the domestic hot water kit add-on. Operation appears to be normal except that it's started leaking a pretty healthy amount of water from the internal expansion tank. What has me quite confused is that it's crystal clear water -- this is in a house with old cast iron rads, so it doesn't appear to be from the main loop. The water auto-fill is also closed. We did have a tech in a few weeks ago to do an annual service -- anything he could have done to have caused this? Is this a typical failure? Thank you!
     
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