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

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by oskarjones, Mar 6, 2010.

  1. oskarjones

    oskarjones New Member

    Mar 6, 2010
    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. cacher_chick

    cacher_chick Test, Don't Guess!

    Jan 5, 2008
    Test, Don't Guess!
    Land of Cheese
    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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