The video at the beginning of this post shows the process for fixing this, which takes about 10 seconds. 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. In Minneapolis, the lack of a properly installed high loop under the kitchen sink requires repair for their Truth-In-Sale of Housing evaluations. 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. 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. We have seen when this piece is not applied that over time the consumer will have issues with the water back up and causing issues with proper drainage and water pooling in a particular area. Viking: In testing our dishwashers, we have found that the additional high loop in the back of the dishwasher is required for proper draining of the water.This keeps the drain hose dried out and keeps any odors from backing up into the dishwasher. Bosch: The high loop in the drain hose of your dishwasher is to keep water from settling in the hose if it were hanging down any lower or horizontally.GE: “If an air gap is not required, the drain hose must have the high loop from the floor to prevent backflow of water into the dishwasher or water siphoning out during operation.”.Listed airgaps shall be installed with the flood level (FL) marking at or above the flood level of the sink or drainboard, whichever is higher, or separately trapped with the airbreak located on the stand pipe.”
#HOW FAR BACK TO MOUNT BOSCH DISHWASHER CODE#
Section 807.4 of the Uniform Plumbing Code states: “No domestic dishwashing machine shall be directly connected to a drainage system or food waste disposer without the use of an approved dishwasher airgap fitting on the discharge side of the dishwashing machine.
Local plumbing codes generally dictate the requirements in your area. Kenmore: “ The high loop or air gap must be used to prevent potential backflow contamination of the dishwasher.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.” “A high loop is required on the dishwasher drain i n the installation instructions for all of your dishwashers. I sent out an email to eight dishwasher manufacturers about a decade ago asking them this question: I’ve heard different reasons for why an additional loop is required under the sink, so I decided to contact the manufacturers directly.
#HOW FAR BACK TO MOUNT BOSCH DISHWASHER MANUAL#
And here’s a diagram from the dishwasher manufacturer showing the same thing.Īlthough 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. But first, here’s a photo showing what a high loop looks like.Īs you can see, the dishwasher drain hose is fastened as high as possible underneath the counter. Hang on, I’ll come back to that in a minute. However, that’s not what we require here in Minnesota. 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. In the diagram above, you’ll notice that the dishwasher drain makes a high loop underneath the kitchen sink. The diagram below right shows a proper installation. With this improper installation, sewer gases have the potential to come back into the dishwasher. The dishwasher drain must be connected before the P-trap, not after it, which is what was done here. Water always sits in the bottom of the P-trap, and this prevents sewer gases from coming into the house. The first problem is the dishwasher drain is connected to the sewer side of the trap. Two of these are related to the dishwasher drain. 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. 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.
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