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>

Best dishwasher installation pros near Melrose, MA

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Verified Reviews for Dishwasher Installation pros in Melrose, MA

*The Angi rating for Dishwasher Installation companies in Melrose, 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 Melrose, 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 August 18, 2026

Reviewed in August 2026
Josh's team was recommended by Gray's Appliance for a dishwasher install. They were fantastic! We had a family emergency and Josh worked with me to do the install even though we couldn't be home. 4 days later our hot water heater went, water everywhere! I called Josh and they...
MANGANARO PLUMBING & HEATING LLC
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Reviewed in February 2026
He did a great job fixing the dishwasher. Everything works fine now, and he was very polite and easy to talk to.
VOLTPRO APPLIANCE REPAIR LLC
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Reviewed in March 2024
Great customer service and no too expensive. I had a problem with my dishwasher couldn't drain the technician checked everything until he found the extension on my drain hose was clugged, he replaced it the same day Roosevelt Was perfect
CARC Appliance Repair LLC
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Reviewed in December 2023
Joe did multiple jobs for me including connecting the dishwasher, installing a stove ventilation fan, repairing/replacing an electric outlet and installing a doorbell. He arrived on time and completed the projects in one visit. His price was very reasonable. I would hire him again.
Joe Gore Master Electrician
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Reviewed in September 2023
Installation team worked quickly and install came out beautiful. They walked the surround of property to make sure everything was cleaned up.
Clear Choice Home Improvements, LLC
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Reviewed in July 2023
Kumar has done extensive work for us over the years. He replaced our garbage disposal. He installed our dishwasher. And he replaced our hot water heater. Without exception he did superb work at reasonable prices. He tried to fix our disposal before replacing it in an effort to save us money. He...
Distinct Plumbing, Heating and Gas Fitting
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Reviewed in March 2023
Wafi was both responsive to the initial repair call and helpful in navigating the possible repair options for our dishwasher. We're very happy with the results.
Wafi Handy Man
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Reviewed in December 2022
We’ve recently reached out to Stocker Appliance for our dishwasher that was was not able to complete a full wash. We kept getting an OE error and water was remaining in the bottom without being fully drained. Ryan was amazing! He was right on point with what the issue was. We purchased the part...
Stocker Appliance Repair LLC
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Reviewed in June 2021
I’m currently renovating my kitchen and I got to the stage where I needed a plumber to hook the drain line up to the garbage disposal and connect my new kitchen sink faucet to my hot/cold line with an additional line for my Dishwasher. I called Peter and explained my situation to him and right...
Waterworks Mechanical Inc
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Reviewed in June 2021
They changed the scope of work the 1st day on the job. They did not repair the area in front of our dishwasher, because they did not want to move it. The rest of the floor came out beautifully.
DS General Services Corp.
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Top-Rated Dishwasher installation pros in Melrose - Updated Nov 2026

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Dishwasher Installation FAQs, answered by experts

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.

Leaks, poor drainage, failure to start, water not heating, and excessive noise frequently require service.

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.

Limescale can build up outside your dishwasher if you live in a home with hard tap water. Any household surface exposed to water and heat may have unsightly limescale deposits, including kettles for boiling water, sinks, countertops, toilets, taps, tubs, shower doors, glassware, and aquariums. Glass, laminate, porcelain, granite, and other similar surfaces can all have limescale.

Water may linger at the bottom of your dishwasher if the cycle is interrupted or if there’s a clog in the system. Begin by pressing and holding the cancel button to ensure the cycle finishes. You may need to check the filter, hose, air gap, and garbage disposal for clogs if it still doesn't drain. If the problem persists and there is no visible clog, a professional will need to assess and fix the problem for you.

The Melrose, 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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