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DIY: Dishwasher Installation.

Proper Dishwasher Installation: The Importance of High-Looping the Drain Line

A dishwasher is a valuable appliance that can save time and energy when it comes to cleaning up after meals. But, like any home appliance, it requires proper installation to function effectively and efficiently. Unfortunately, one crucial step that is often overlooked during dishwasher installation is the high-looping of the drain line. In this blog post, we'll explore why high-looping is so important and how to properly install a dishwasher.

Why High-Looping the Drain Line is Important

The high-looping of the dishwasher drain line is essential because it helps prevent dirty water from backing up into the dishwasher. Without a high loop, the dishwasher drain line is vulnerable to backflow from the sink's drain. This can lead to contaminated water entering the dishwasher and leaving behind unpleasant odors.

The high-looping technique creates a "U" shape in the drain line, with the loop located at least 18 inches above the floor. This loop helps to keep the dishwasher drain line separate from the sink's drain, preventing backflow from the sink and maintaining proper drainage in the dishwasher. High-looping is a simple and effective way to prevent costly and unpleasant issues from occurring.

Proper Dishwasher Installation Steps

Now that we understand why high-looping the drain line is so important, let's take a look at the steps required to install a dishwasher properly.

Step 1: Check the Plumbing

Before installing the dishwasher, make sure the plumbing is up to code and compatible with the appliance. Check that the water supply and drainage pipes are in good condition, and the water supply valve is in working order.

Step 2: Preparing the Area

Clear out any items from underneath the sink to create space for the dishwasher. Clean the area and check for any leaks or water damage in the plumbing or cabinets.

Step 3: Connect the Water Supply

Attach the water supply line to the dishwasher's inlet valve, and connect the other end to the water supply valve under the sink. Turn on the water supply valve and check for leaks.

Step 4: Install the Drain Line

Attach the drain line to the dishwasher and route it up to the underside of the countertop or sink rim to create a high-loop. Secure the drain line with clamps and connect it to the sink's drain or garbage disposal.

Step 5: Install Power Supply Cable

Attach the dishwashers power supply cord to the proper wires using wire nuts and securing those with electrical tape before securing the junction box.

Step 6: Level the Dishwasher

Ensure that the dishwasher is level by adjusting the feet at the bottom of the appliance. A level dishwasher will operate efficiently and prevent leaks.

Step 7: Test the Dishwasher

Turn on the dishwasher and run a test cycle to ensure it is operating correctly. Check for any leaks or drainage issues and adjust the dishwasher's positioning as necessary.


Proper installation of a dishwasher is crucial to ensure its proper function and longevity. High-looping the dishwasher's drain line is a simple and effective way to prevent contaminated water from entering the appliance and causing unpleasant odors. By following the proper procedures your dishwasher will not only clean better, but also last longer.

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