Could use some help trying to determine the age of this Williamson thermoflow NG boiler. Can’t find it in my blue book or online.
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Walt, it is 80% efficient and the ansi date is 1976 so within 3 or 4 years of that date is my guess.

Hope you’re well and warm in the UP. :smiley:

Thanks Larry. Keeping the wood stove stoked.

Some info here