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Thread: dehumidifier tie in to basement dwv with primer valve

  1. #1
    Not a Master Plumber novicepiper's Avatar
    Join Date
    Apr 2008
    CAN Toronto GTA

    Default dehumidifier tie in to basement dwv with primer valve

    Hi - I need a floor drain in the furnace room somewhere nr the hot water tank... I need to attach the two pipes to either the dwv or into the new floor drain setup - whichever is code!?

    1) Do i need a vent for this proposed floor drain.?
    2) Also, should I install sometype of primer to the floor drain to keep the trap sealed?

    any advice would be appreciated -

    I will post a pic tomorrow

  2. #2
    Engineer Furd's Avatar
    Join Date
    Jul 2007
    Wet side of Washington State


    I am not a plumber and I do not have any answers for you but I would like to know the answers.

    Since all traps need to be vented I would think that floor drains would also need to be vented yet I don't think I have seen this done. I have seen a lot of floor drains and many of them were in the middle of a floor and therefore quite some distance from any vent.

    I've also seen quite a few trap primers in industrial locations and they all seemed to be discharging a huge amount of water at a constant rate, probably a half a cup a minute. Such a flow rate would be in the neighborhood of fifty gallons a day and that would be a heck of a lot of water in a residence. I sure wouldn't want that in my house. I found that throttling back the flow on these trap primers to just a fast drip would often completely stop in a couple of days thereby defeating the purpose of the trap primer.


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