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

    Jan 28, 2007
    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

    Jun 21, 2007
    I smash things and demand money.
    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.
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  4. ArtM

    ArtM Junior Member

    Jan 10, 2009
    General Contractor
    East Slope of the Rockies
    Fill the trap with mineral oil. It won't evaporate out like the water will.
  5. Ladiesman271

    Ladiesman271 Homeowner

    Aug 22, 2008
    Care and maintenance of transformers
    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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