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Dishwasher Drain Hose Too Long

By December 22, 2020Plumbing
Dishwasher Drain Hose Too Long

When you buy a new dishwasher, it comes with a very long drain hose.  Does it seem like the dishwasher drain hose is too long?  Well, it might not be, as it depends on the way you are going to connect it to the kitchen sink.  If you choose to do a “high loop installation” this will take care of the length of the hose.

It is important to check with your state also for installation rules.  Let’s take a look at why this matters, why high loop, other guidelines to follow, what is an air gap, state requirements for plumbing, what to do with septic, the two different techniques for this long hose.  – Air Gap and High Loop, and also how to install these different types in case you are looking for information on that as well.

Dishwasher Drain Hose and Why This Matters

Dishwashers all come with a drain hose that is about 6 feet in length but can be made to reach up to 10-12 feet with attachments.  However, sometimes it is too long depending on the space you have from your sink to your dishwasher. 

The manufacturers pack this longer hose so you have enough room to hook it up, as they don’t know your state rules or how far your sink is from the dishwasher.

Dishwasher drain hose and why this matters

Why High Loop When Dishwasher Drain Hose Too Long

In some homes, the dishwasher may not be next to the sink so more hose is needed. In most cases, your state will require a dishwasher high loop, which is when the hose travels from a low, to a high, and then back down. 

The hose needs to be at a higher level than the dishwasher’s water level, as well as the sink drain, to prevent water back flowing into the dishwasher. Keep in mind that you need to have the hose 32 inches above the floor to have a high loop.

Here is a video about air gap and high loop:

Other Guidelines to Follow When Dishwasher Drain Hose Too Long

On the other hand, if your state only allows, or also requires, an air gap, you may need the extra length depending on how far the air gap is from the dishwasher.  As mentioned earlier, the air gap is on top of the sink and may require a longer hose.  The manufacturer’s guide will also tell you what their recommendations are too.

What is Air Gap?

Air Gap has a fitting that is installed on top of the sink to allow the hose to pass through to the drain.  It provides a space in the line to keep the dirty water from the drain from going back into the dishwasher and contaminating the dishes. It can be hooked up to the drain line or to the garbage disposal.

Septic – Use High Loop

If you have a septic, you don’t need to hook up your air gap or high loop to the garbage disposal.  It is not a good idea to run the garbage disposal when you have septic so you can save time by making the high loop instead (if allowed in your state).

Check the drain is connected before the P Trap and not after, as this is the sewer side. You may need a hole drilled in the sink if have an under-mount sink if there is no air gap.

State Requirements for Plumbing

Every state will be different for requirements for installation of the dishwasher and the connections.  South Carolina requirements are found here.

South Carolina requires only an air gap. Some states will allow the high loop installation, while others require an air gap or both. If you need help installing Air Gap or High Loop to the garbage disposal or drain, contact a professional.

Air Gap Connected to the Garbage Disposal

If you are interested in step by step directions for trying to connect drain with air gap and garbage disposal, see below.

  1. Air gap fitting is mounted on the sink
  2. Cut the dishwasher drain hose so it fits into the air gap under the sink
  3. Use a hose clamp and connect the end of the hose to the air gap mount
  4. Using a 7/8 in. hose, connect the large end of the air gap to the garbage disposal
  5. Both ends of the hose need to have a hose clamp
  6. Make sure the hose is straight and not twisted up and no kinks to keep the water from flowing through

Air Gap – No Garbage Disposal

  1. Air gap fitting is mounted on the sink
  2. Cut the dishwasher drain hose so it fits into the air gap under the sink
  3. Use a hose clamp and connect the end of the hose to the air gap mount
  4. The sink drain has a Y branch tailgate piece- hook up the larger side of air gap to this piece
  5. Both ends of the hose need to have a hose clamp
  6. Make sure the hose is straight and not twisted up and no kinks to keep the water from flowing through
High Loop to the Garbage Disposal Helps With the Dishwasher Drain Hose Being Too Long

High Loop to the Garbage Disposal Helps With the Dishwasher Drain Hose Being Too Long

This is the process of installing the drain loop under the sink and putting it at a level that is higher than the dishwasher’s water level.  You need it to be high up under the sink so the dirty water doesn’t pull back into the clean dishwasher. 

Reminder to check the codes to see if this type of installation is acceptable.

  1. Pull the drain hose as far as you can from the dishwasher and put it under the sink.
  2. You will need enough to create a high loop.  The high loop is necessary before connecting the garbage disposal to the drain hose.
  3. Strap the drain hose as high as possible underneath the sink with a pipe clamp
  4. Dishwasher drain hose and garbage disposal are connected with hose clamps.

High Loop Directly to the Drain

  1. Pull the drain hose as far as you can from the dishwasher and put it under the sink.
  2. You will need enough to create a high loop.
  3. Take the end of the dishwasher drain line and attach it to the Y-branch tailpiece, and secure it with a hose clamp.
  4. Not sure what a Y-branch tailpiece is?  It can be purchased to match the size of your dishwasher drain hose.
When to call a professional if dishwasher drain hose too long
Source: Amazon Dishwasher Drain Hose

When to Call a Professional If Dishwasher Drain Hose Too Long

  • If you need an air gap installed
  • Having issues hooking up the drain hoses
  • Everything is hooked up correctly but the dishwasher isn’t working
  • Water or sewer water is coming up through the sink
  • You don’t want to bother with this on your own

Conclusion

Any time you are dealing with appliances, it can be tricky unless you know what you are doing.  Dishwashers need to be hooked up correctly to avoid sewer water coming through.  Don’t hesitate to reach out for help.  We are here to assist you, so please leave a reply below and let us know how we can help!

The Rivertown Team

Author The Rivertown Team

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