What type of drain below hot water heater

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by spresco, Jan 13, 2009.

  1. spresco

    spresco New Member

    Messages:
    11
    What type of drain should be used below a hot water heater? A standard p-trap below the floor would have a tendency to evaporate out allowing sewer gasses in so what type is usually used?
  2. Basement_Lurker

    Basement_Lurker One who lurks

    Messages:
    668
    Location:
    Victoria, BC
    If you want to do it correctly, then a p-trap is mandatory, but you also need to use a trap primer to keep that p-trap primed.

    Some codes will actually allow the homeowner to forgo the use of a trap primer so long as they manually fill the trap from time to time, but that is not exactly a reliable method since the homeowner will quickly forget all about it.
  3. ArtM

    ArtM Junior Member

    Messages:
    9
    Location:
    East Slope of the Rockies
    Fill the trap with mineral oil. It won't evaporate out like the water will.
  4. Ladiesman271

    Ladiesman271 Homeowner

    Messages:
    221
    I don't have a floor drain in my basement for my water heater or anything else. The sewer pipe outlet is a few feet higher than the basement floor level, so it impossible to use one in my basement anyhow!
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