Are dishwashers more energy-efficient than handwashing?

• <div><p>The answer is a resounding yes, as <a href="https://www.angi.com/articles/hand-washing-vs-dishwasher-cost.htm">dishwashers save significant water</a> and energy compared to washing dishes by hand. The difference is so drastic in fact that those who use energy-efficient dishwashers can expect savings of over <b>$450</b> <b>per year</b>. This is because dishwashers use less water, they wash at a higher temperature than a hand rinse, and you don’t need to rinse them after washing. New dishwashers use around 4 gallons per load, whereas washing by hand can use up to 2 gallons per minute.</p></div>

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>

How long will it take to install my dishwasher?

• <div><p>Installing a dishwasher should take one to four hours, depending on the complexity of the installation and whether you DIY or hire a pro. Even if you're particularly handy, installing a dishwasher on your own will likely take longer — at least two hours. On the other hand, a professional can likely install a dishwasher in about an hour. Installation time will take longer if you have to remove an existing dishwasher, reroute plumbing, or repair damaged flooring underneath the appliance.</p></div>

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Verified Reviews for Dishwasher Installation pros in Newton, MA

*The Angi rating for Dishwasher Installation companies in Newton, 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 Newton, 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 September 2025
José was fantastic! He was very kind, professional, and respectful. This company has fixed washer and dryer machines, intercoms, dishwashers, and more. Everything was done quickly and efficiently. I highly recommend!!
JG Appliance repair
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Reviewed in February 2025
Saved us from having to purchase a new dishwasher! Friendly, professional, and skilled!
BK Appliances
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Reviewed in March 2023
Was on time and fixed the dishwasher quickly. Did a great job and I would use him again for any appliance issue I had.
A.E.T Services, LLC
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Reviewed in March 2023
Dexter provided, efficient, timely, honest, expert evaluation of our dishwasher
APS Electronics
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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
He installed a glass backsplash in my kitchen and did an excellent job. Arrived on time, had all the right tools and creatively solved a minor installation issue. Very professional and knowledgeable. I’ll hire him again.
Roger Carpentry
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Reviewed in September 2021
George came to price an outlet installation for my new washer. He was so direct and honest and reasonable that I hired him to do it on the spot. Two weeks later the light in my bathroom ceiling fan went out. I called him to come out and instead he diagnosed the problem (correctly) through text...
T & G Electrical
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Reviewed in January 2021
Mike was great. He was courteous and polite. They were suppose to remove the dishwasher as well, but Mike was alone, but he informed me that he will arrange for pickup to remove the old dishwasher on another day. I paid in full for the service which included removal. Thinking in the back of my...
Northeast Appliance Pro's Inc.
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Reviewed in November 2020
Jeff made the process as easy as possible. He recommended the best solution and got it installed quickly. I would definitely recommend J Griffin plumbing and heating to others.
J.Griffin Heating & Plumbing
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Top-Rated Dishwasher installation pros in Newton - Updated Nov 2026

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Dishwasher Installation FAQs, answered by experts

The answer is a resounding yes, as dishwashers save significant water and energy compared to washing dishes by hand. The difference is so drastic in fact that those who use energy-efficient dishwashers can expect savings of over $450 per year. This is because dishwashers use less water, they wash at a higher temperature than a hand rinse, and you don’t need to rinse them after washing. New dishwashers use around 4 gallons per load, whereas washing by hand can use up to 2 gallons per minute.

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.

Installing a dishwasher should take one to four hours, depending on the complexity of the installation and whether you DIY or hire a pro. Even if you're particularly handy, installing a dishwasher on your own will likely take longer — at least two hours. On the other hand, a professional can likely install a dishwasher in about an hour. Installation time will take longer if you have to remove an existing dishwasher, reroute plumbing, or repair damaged flooring underneath the appliance.

Yes, a dishwasher needs an air gap to prevent backflow. Additionally, in many locations, air gaps or another measure to prevent backflow are required for building code compliance. There are alternatives to an air gap, like a Studor vent or a loop and trap design, but an air gap is the simplest and most popular solution.

Professional repair is advisable for electrical issues, refrigerant leaks, or unfamiliar problems. Technicians can accurately diagnose and fix such problems, ensuring safety and appliance longevity.

The Newton, 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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