back draft

  1. Margarett

    WH back drafts when the furnace is on at the same time

    Sorry for the long post, but I don’t want to leave anything important out. Over the weekend, I noticed that our hot water heater back drafts when the furnace is on at the same time. They both vent together to the chimney. Please see attached pictures. The WH (40 gallon – 40,000BTU input) is 4...
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