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Thread: What type of drain below hot water heater

  1. #1

    Default What type of drain below hot water heater

    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. #2
    One who lurks Basement_Lurker's Avatar
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    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.
    Broken promises don't upset me. I just think, why did they believe me? -Jack Handy


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    Quote Originally Posted by Basement_Lurker View Post
    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.
    Fill the trap with mineral oil. It won't evaporate out like the water will.

  4. #4

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    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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