Why does a dishwasher have to drain through the sink plumbing?

• <div><p>Any drain in your house requires a water trap to prevent sewer gases from entering the home. Dishwashers don’t have an internal water trap, so they must use an external P trap. The most convenient P trap for the dishwasher is already in the plumbing under your sink.</p></div>

What is the standard size of a dishwasher?

• <div><p>A standard <a href="https://www.angi.com/articles/dishwasher-sizes.htm">dishwasher size</a> is 24-by-24-by-35-inch for a built-in unit. The depth and height line up perfectly with most kitchen countertops and cabinet sizes. </p></div>

Are all dishwashers 60cm wide?

• <div><p>Not all dishwashers are 60cm wide, but that tends to be the most common size. 60cm translates into roughly 24 inches, with most home dishwashers being between 22 and 24 inches wide. There aren’t metrics available but it’s been our experience that over 90% of household dishwashers in North America are around 24 inches wide by 24 inches tall.</p></div>

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Verified Reviews for Dishwasher Installation pros in Wellesley, MA

*The Angi rating for Dishwasher Installation companies in Wellesley, MA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Dishwasher Installation needs.

*The HomeAdvisor rating for Dishwasher Installation companies in Wellesley, MA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Dishwasher Installation needs.

Last update on May 11, 2026

Reviewed in May 2026
Excellent service from start to finish. Alexandr was polite, knowledgeable and professional technician. My dishwasher had a serious issue, but he diagnosed the problem quickly and repaired it the same day . I?m very happy with result and would definitely use this service again . Highly recommend!
Horizon Appliance Solutions
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Reviewed in March 2026
The dishwasher was leaking, and the technician came out and fixed the issue quickly. The price was fair, and the service was great. Very responsive, professional, and easy to deal with. Highly recommend.
Pro Appliance Express, LLC.
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Reviewed in November 2025
They responded and arrived quickly. Vlad explained in detail what happened, the cause of the issue, and the available repair options. He also gave an honest assessment of whether the repair was worth doing based on the fridge?s condition and the estimated cost. We also asked him to check our...
One-Fix Appliance & Refrigeration
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Reviewed in January 2025
?Adam was a lifesaver when my dishwasher stopped draining. He was friendly, efficient and left my kitchen spotless after the repair. Thank you!
Pegas Appliance Repair
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Reviewed in January 2025
My project was to install two microwaves. TJ is prompt, knowledgeable, courteous and neat. One of the microwave I bought was without the flush hinge. That prevented the door from opening full after it was installed. TJ patiently explained to me the kind that I need to buy and later that day...
TJ's Painting & Remodeling
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Reviewed in November 2022
The entire process from sales to installation was seamless
H2O Care Inc
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Reviewed in May 2022
Diego was awesome! He picked up the dishwasher, installed it professionally, and removed the old unit. Great job, reasonably priced! I will contact Rocha first for any project like this in the future!
Rocha Installations
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Reviewed in November 2021
Dan installed my dishwasher but it has a leak where the hose conects. I have not been sucessful in getting him back to fix it. I will need to hire someone else to fix it.
TLC By Dan
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Reviewed in July 2021
HUB Appliance did work for me two separate times in the last two months, and both times did a fantastic job. First my washing machine broke. Al sent out Justin and John, who were able to diagnose and repair the machine quickly. They did such a great job that when my dishwasher stopped working, I...
HUB Appliance
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Reviewed in October 2020
John diagnosed the problem with our dishwasher over the phone. He then told me how to fix it, which I was able to do quite quickly. He saved us the cost of a service call, made nothing on this himself, and showed himself to be a knowledgeable and honest person. He’ll get our first call next time...
ACCURATE APPLIANCE REPAIR
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Dishwasher Installation questions, answered by experts

A clogged air gap can cause a dishwasher not to drain. There are, however, other potential issues that can lead to improper drainage. For example, if you have attached the air gap to a garbage disposal and forgotten to remove the knockout plug, wastewater may backflow into the dishwasher. Check that the air gap is installed properly, and then look for clogs in the air gap and dishwasher filters.

Water is sitting at the bottom of your dishwasher, likely because the filter is dirty with food debris or because the drain hose has a clog. If the water is still sticking around after following the steps above, it’s time to contact a local plumber.

Any drain in your house requires a water trap to prevent sewer gases from entering the home. Dishwashers don’t have an internal water trap, so they must use an external P trap. The most convenient P trap for the dishwasher is already in the plumbing under your sink.

A standard dishwasher size is 24-by-24-by-35-inch for a built-in unit. The depth and height line up perfectly with most kitchen countertops and cabinet sizes.

Not all dishwashers are 60cm wide, but that tends to be the most common size. 60cm translates into roughly 24 inches, with most home dishwashers being between 22 and 24 inches wide. There aren’t metrics available but it’s been our experience that over 90% of household dishwashers in North America are around 24 inches wide by 24 inches tall.

The Wellesley, MA homeowners’ guide to dishwasher installation services

From average costs to expert advice, get all the answers you need to get your job done.

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