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Thread: Can I Tap Into Drain Pipe to Drain Condensate From High Efficiency Furnace

  1. #1
    DIY Junior Member
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    Mar 2010
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    Default Can I Tap Into Drain Pipe to Drain Condensate From High Efficiency Furnace

    I just installed a high efficiency furnace in my unfinished basement. I want to use gravity instead of a pump to drain the condensate produced by the furnace. I have two drain pipes (a 2" and 1 1/2") that travel down the wall behind the furnace and into the concrete slab. I think one drains the washroom and the other a bathroom upstairs. Can I tap into one of these drain pipes with a y then run my condensate line into it? Would I need some kind of a p-trap, venting...The furnace uses 3/4" drain line.

  2. #2
    Test, Don't Guess! cacher_chick's Avatar
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    Jan 2008
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    Land of Cheese
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    It is no different than if you were installing a sink at that location. You will need a trap and it must be vented. Instead of a sink you would use a standpipe.

    If the sewer ever backs up, it will come out the lowest point in the house, which might then be the standpipe.

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