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flue

  1. T

    Natural Gas Flue

    Hello, I am looking into replacing my old electric water heater with a natural gas tankless water heater. In my water heater closet, there is an old 6-1/2" furnace flue that vents to my roof. Pictures: https://postimg.cc/gallery/kD8s0Jh I had a contractor tell me I could not convert/re-use...
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