An improperly installed dishwasher drain hose is the most common defect we find with dishwasher installations, but it’s also one of the easiest things to get right.
In the photo below, which was featured as a Structure Tech Photo of the Day on our Facebook page, there are several plumbing defects shown. Two of these are related to the dishwasher drain.
Side of the trap. Water always sits in the bottom of the P-trap, and this prevents sewer gases from coming into the house. The dishwasher drain must be connected
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It, which is what was done here. With this improper installation, sewer gases have the potential to come back into the dishwasher. The diagram below right shows a proper installation.
In the diagram above, you’ll notice that the dishwasher drain makes a high loop underneath the kitchen sink. This is the minimum requirement for every dishwasher drain installation; it’s required by every dishwasher manufacturer, as well as section P2717.2 of the International Residential Code. However, that’s not what we require here in Minnesota. Hang on, I’ll come back to that in a minute. But first, here’s a photo showing what a high loop looks like.
As you can see, the dishwasher drain hose is fastened as high as possible underneath the counter. And here’s a diagram from the dishwasher manufacturer showing the same thing.
Magtonson 6ft Portable Dishwasher Whirlpool Fill And Drain Hose Assembly Compatible With W10273574
Although new dishwashers come from the manufacturer with the drain looped up at the side of the dishwasher, every installation manual still requires this high loop underneath the sink.
I’ve heard different reasons for why an additional loop is required under the sink, so I decided to contact the manufacturers directly.
“A high loop is required on the dishwasher drain in the installation instructions for all of your dishwashers. What is the purpose of this? Doesn’t the high loop that is incorporated into the side of the dishwasher achieve the same thing? Any insight or commentary into this matter would be greatly appreciated.”
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To summarize, the reasons for the high loop are to prevent potential backflow of water into the dishwasher and to prevent improper drainage of water. Even though dishwashers come from the factory with the drain looped up high against the side of the dishwasher, this is not an acceptable substitute for the high loop underneath the kitchen sink. In Minneapolis, the lack of a properly installed high loop under the kitchen sink requires repair for their Truth-In-Sale of Housing evaluations. If you don’t have a high loop on your kitchen sink drain, it’ll take three items to fix this: a screwdriver, a screw, and a 3/4″ EMT clamp, which you’ll find in the electrical department of any home improvement store.
Instead of a high loop underneath the kitchen sink, dishwasher manufacturers also allow an air gap. This consists of an ugly device mounted on top of the kitchen sink, and it looks like this:
These have been required in Minnesota since the beginning of 2016, and nobody likes them. I blogged about dishwasher air gaps back in 2017, and I’m going to quote what I said back then. Dishwasher air gaps are definitely
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Something that we recommend installing during our home inspections. While dishwasher air gaps are technically required on new installations by code, we’re not code-compliance inspectors. As home inspectors, we get to make recommendations on stuff that makes sense to us. These don’t.
The great news is that air gaps should be going away soon, at least in Minnesota. Our current plumbing code requires an air gap through sections 414.3 and 807.4 of our plumbing code. Thankfully, the next version of our plumbing code, scheduled for adoption on 12/17/21, will change that. Section 414.3 will tell you to follow section 807.3, and that section will say the following:
I underlined the important part that’s changing. Yay. Homeowners, plumbers, builders, designers, building officials, and everyone else should be happy about this change. Well, everyone except for air gap manufacturers. Sorry guys, but you had your day.I'm currently remodeling on the cheap (Mills Pride cabinetry and Home Depot stock countertops) to get the kitchen out of the 1960's (metal cabinets and no dishwasher). Due to the multiple doorways in my kitchen (there are 4) the cabinets are broken up enough that there isn't sufficient space for a full size dishwasher right next to the sink. My concern is how can I plumb a drain for a stand alone dishwasher? The power and hot water supply lines are simple enough but the drain has me a little stumped. The main drain line in the basement runs pretty close to where I want to put the dishwasher in the kitchen and it's PVC pipe which is easy to tee into, I'm just wondering about venting issues, trap design and so on.
Ge Nautilus Gsc3400j00ww Portable Not Draining Completely
I if I had unlimited funds I'd just move the range and/or sink to another wall to make room for the dishwasher to have a sink drain to tee into but that is a lot larger of a project than I have time and money for right now.
How far away is the dishwasher going to be from the plumbing for the kitchen sink? We have done some pretty weird kitchen layouts at work (new modular home construction) and have always used either 5./8 or in your case 3/4 dishwasher hose to run from the drain line off the dishwasher to the dishwasher wye that we put inline on the kitchen abs. If you want you can shoot me some pics and ill see what i can do to help you out.
When I had a stand alone dishwasher in an apartment, it drained into the sink. The water came from an attachment on the sink faucet. When I finally moved into a house, I took the metal cabinet shell off and built it in. I had the metal cabinet kicking around for several years, using the metal for patches on rust damage on a car I was working on. It was a good heavy guage metal, enamal coated paint.
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The one above shows the sink and the dishwasher where I'd like it to go on the left. As you can see if I would put it to the left of the sink I'd have 3 problems:
3. It wouldn't open all the way without hitting the cabinets on the wall to the left (where I want to put the dishwasher), so I'd loose some cabinets and counter space to give clearance.
To the left of the sink is out also unless I move the range to another part of the kitchen and redesign the entire layout of everything:
Whirlpool Dishwasher Drain Hose W11381654
Is the range gas or 220? If its electric, I'd swap the range and the washer, were it my kitchen. The washer looks at home next to the sink, and is more functional there. The range does not need to be adjacent to it. The only reason i see for keeping it there is if you are tied down to a natural gas line or something. Good luck matching that counter top though
It's a 220v electric Bosch range. The advantage of keeping it at its current location is that it is on an outside wall so when I put in a range hood external venting will be relatively easy. The wall where the dishwasher is currently sitting is an interior wall, so I'd have to run a lengthy vent to the outside through a wall or the ceiling.
The countertops are going. Got some gray granite looking Formica tops to replace them (they were a discontinued color at Home Depot so I paid less than $100 on clearance for two 8 foot pieces and a 6 footer that I'll cut down to fit). Some of the old ones will make nice workstations in the garage though.
Wd24x10014 Ge Dishwasher Drain Hose
I'm a plumber. I'm not sure what the laws are in PA but in CA you can't use an S-trap (a loop over vent). Hence, you need to vent up the wall to the roof. You don't HAVE to have the vent inside the wall. If you want to fir out the wall with a 4 inch chase behind the diswasher you can avoid tearing up the drywall, but you lose 4 inches of what already looks like a small kitchen.
If it were mine, I'd relocate the sink to either side of the counter (not in the middle) and place the dishwasher on the other side and vent and drain through the sink plumbing.
You can put a dishwasher anywhere you want. The key is the vent. Ideally if you can go up a wall and hit the main vent that is the best
Keeney 1 1/2 In. X 8 In. Plastic Dishwasher Branch Tailpiece Pp931 8pvc
Yea...thought of that, I would have done that if I didn't think it would mess up the looks because the sink is symmetrical with the two windows right now. That and I'm doing this on the cheap....note that the sink base cabinet (which was the only existing wood cabinet in the kitchen) has new doors on the sides, I'm just hanging new doors on the existing cabinet to make them match the rest of the ones I plan to install.
I'm
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