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Thread: Dishwasher drain length

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    DIY Member cybervex's Avatar
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    Default Dishwasher drain length

    How long can a dishwasher drain be. My dishwaser is in a peninsula and the length for the drain would be approx. 10 feet. Is this ok as long as I have the air gap.
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    Retired Defense Industry Engineer jadnashua's Avatar
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    Mine's at least that long. Just try to keep the pipe so it doesn't have bellies so stuff can accumulate. The pumping action should keep them clean, but better safe than sorry and it can keep smells down if the thing isn't used often.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    DIY Senior Member MG's Avatar
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    Not that it would be easy to accomplish, but it it were to be feasible for a situation like that could you route in PVC for a dishwasher drain that long so you could avoid bellies in the line?
    Note: I am a DIY'er and not a professional. My posts here are observations / opinions and may or may not be in accordance with your local ordinances.

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Default drain

    If it has an air gap, then, by definition, all the water in the hose above the bottom of the dishwasher will drain back into it, if the pump's check valve does not hold which few of them do. That being the case, it might be better to keep the hose low, i.e., below the cabinet's floor, until it gets to the sink cabinet to minimize the amount of water subject to that backflow.

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    DIY Member cybervex's Avatar
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    Another option I thought of was building a half-wall at the back of the peninsula and giving the dishwasher its own drain.

    My house has no insulation or drywall yet so any idea is worth thinking about. The only drains I have left are the Kitchen sink and dishwasher.

    Jay
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    DIY Member cybervex's Avatar
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    Quote Originally Posted by hj View Post
    If it has an air gap, then, by definition, all the water in the hose above the bottom of the dishwasher will drain back into it, if the pump's check valve does not hold which few of them do. That being the case, it might be better to keep the hose low, i.e., below the cabinet's floor, until it gets to the sink cabinet to minimize the amount of water subject to that backflow.

    So would you be suggesting a high loop at the dishwasher then carry the distance near the floor? That way the only water able to return to the dishwasher would from the peak of the loop.
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    Aspiring Old Fart, EE, computer & networking geek Mikey's Avatar
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    Quote Originally Posted by cybervex View Post
    Another option I thought of was building a half-wall at the back of the peninsula and giving the dishwasher its own drain.

    My house has no insulation or drywall yet so any idea is worth thinking about.
    Unless your dishwasher is a lot more expensive than mine, you might want the wall there for acoustic reasons. Make it a 6-inch wall, stuffed with fiberglass, open on the DW side to suck up the noise.

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    DIY Member cybervex's Avatar
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    Quote Originally Posted by Mikey View Post
    Unless your dishwasher is a lot more expensive than mine, you might want the wall there for acoustic reasons. Make it a 6-inch wall, stuffed with fiberglass, open on the DW side to suck up the noise.
    I am hoping that this $700 Maytag will be quieter than the $100 off brand I have in my current home, which I do not find to be all that noisy.

    I was only considering the half wall to provide a place for me to give the dishwasher it's own drain. I suppose I will just build the half wall as the back of the peninsula. Better support for the granite I guess.

    Thanks for the input guys!!!
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  9. #9
    Aspiring Old Fart, EE, computer & networking geek Mikey's Avatar
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    [quote=cybervex;131025]Better support for the granite I guess.
    quote]
    Right - there's no such thing as too much support for a granite countertop.

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