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Old 12-31-2017, 07:29 PM   #1
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Drain portable dishwasher into laundry standpipe?


I got a portable dishwasher I'd like to add in my cabin, and the layout is such that it would be trivial to hook it up to the laundry connection and leave it full time without wheeling it around.

The hot water seems straightforward - any hose splitter should do the trick.

But anything special about the drain? Just shove the drain hose in there alongside the washer drain? tap the top of the washer drain hose and make a fitting? Make a PVC "Y" out of the the standpipe?

Is there a "right" way? More importantly, is there a "wrong" way?

I thought it would be a more common question, but I've not been able to find much.

Thanks for looking.
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Old 01-01-2018, 02:40 PM   #2
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Re: Drain portable dishwasher into laundry standpipe?


I don't think that a 2" drain can handle the water from the dishwasher if you just shove the hose into the opened pipe just above the trap. I would cut the drain pipe & install a Tee downstream from the trap. Even better would be in the 4".

When I lived in a house with some family, my brother connected the sink with an ejector pump, in a dark room to the washing machine drain. The moral of that story was don't use them at the same time.
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Old 01-01-2018, 03:18 PM   #3
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Re: Drain portable dishwasher into laundry standpipe?


does your portable washer have that all in 1 tee water & drain for hook up to kitchen sink?
sears used to sell a lot (of portable washers & a lot) of conversion kits for making them convert to under counter installation... that style parts/kit may help get you closest to done...
residential DW doesn't dump but maybe 3-5 gallons per cycle so yes I'm certain washer drain will handle discharge from portable DW... if drain doesn't it not DW 's fault IMO
If there is an appliance parts supply house nearby, take your model & serial #'s to them & see what they can come up with

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Old 01-01-2018, 07:20 PM   #4
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Re: Drain portable dishwasher into laundry standpipe?


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Originally Posted by DR P View Post
does your portable washer have that all in 1 tee water & drain for hook up to kitchen sink?
Well that's the thing. It originally did, and doesn't any more. I got it secondhand. The owner had it hooked in permanently so the original tubes and fittings are gone. I can get an original setup. Heck I HAVE one, as I'm upgrading from a countertop portable to a floor model, but I'd like to sell the countertop unit intact.

So whatever I do I'll be doing it from scratch. I might as well do what I want.

At the base level, I could swap them in and out, but I don't want to forget!
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Old 01-01-2018, 07:55 PM   #5
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Re: Drain portable dishwasher into laundry standpipe?


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Well that's the thing. It originally did, and doesn't any more. I got it secondhand. The owner had it hooked in permanently so the original tubes and fittings are gone.
You don't need to convert back to portable...
If washer stand pipe is exposed, add a wye, bushing down to accept a barb fitting that will clamp onto DW drain hose...
install a couple pipe supports 4" above overflow of washer drain.
zip tie water and drain hoses together multiple times down to appliance ...

if washer drain is recessed & or in box,
you will again zip tie drain hose to hot water hose multiple places to support/secure DW drain going into 2" drain...
install a couple of pipe clamp 4" above overflow to hold/support/direct DW discharge properly into washer drain...

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