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Top-Rated Tankless water heater repair pros in Dover - Updated Nov 2026

Avatar for Robert Johnson Plumbing
Robert Johnson Plumbing
5.0(
325
)
Tankless Water Heater - Repair

Serving Dover, NH and surrounding areas

Approved

In business since 2009

Free estimates

Offers commercial services

"Robert was very responsive to my request for a water heater replacement. His pricing was competitive, and his crew was prompt and professional. The work was complete less than 24 hours after first contact. I recommend Robert Johnson Plumbing and plan to be a repeat customer, myself"
2 neighbors recently requested a quote
Recommended by86%of homeowners
Wanda's Water Heaters
4.9(
12
)
Tankless Water Heater - Repair

Serving Dover, NH and surrounding areas

Approved

Super Service Award Winner

In business since 2020

Free estimates

Credit card accepted

"I purchased a heat pump electric water heater to take advantage of a generous rebate from Efficiency Maine. When looking for someone to install it I was referred to Jophil by a real estate company that I know. I called and was given a time that Kyle would arrive to give an estimate and perform the installation (if the estimate was accepted). I did accept the estimate and Kyle got right to work. He did a nice job and made sure that everything was in good working order before he left. I was very pleased with my first experience with this company and would not hesitate to call on them again in the future."
Installation of boiler
Response time1 day
2 neighbors recently requested a quote
Recommended by8%of homeowners
Avatar for Barrington Solutions Plumbing & Heating LLC
Barrington Solutions Plumbing & Heating LLC
4.9(
17
)
Tankless Water Heater - Repair

Serving Dover, NH and surrounding areas

Approved

In business since 2024

Free estimates

Small jobs welcome

Barrington Solutions is the premier plumbing and HVAC specialist for new construction and major residential builds throughout New Hampshire's Lakes Region. Built on a foundation of elite technical expertise, strict project timelines, and clear communication, we partner with builders, contractors, and homeowners to engineer and install flawless mechanical systems from the ground up.While we provide full-service plumbing, high-efficiency heating, and advanced cooling solutions for existing properties, our true passion and specialty lie in rough-in plumbing, complete system design, and the seamless integration of modern heat pumps, boilers, and mini-splits for new homes. We treat every job site with total professionalism, ensuring your project stays on schedule, on budget, and up to code. Contact Barrington Solutions today to bring top-tier mechanical craftsmanship to your next build.

Granite Ridge
Brook hill development
Sanborton
Derry
2.5 bathroom modular

+39

41 neighbors recently requested a quote
Avatar for Skovron Mechanical Services
Skovron Mechanical Services
4.1(
85
)
Tankless Water Heater - Repair

Serving Dover, NH and surrounding areas

Approved

In business since 2003

Free estimates

Emergency services offered

"Excellent communication from Keith; outstanding service from Roger. Professional, timely, and reasonably priced. They came in under estimate on my boiler repair and advised that a second bit of work that had previously been discussed was not going to be necessary. I will definitely use them again and highly recommend them!"
Commercial Cooling
Before Oil Boiler
Old
Oil Boiler
HVAC Roof Top Unit

+19

Response time9 hrs
Response rate100%
Recommended by84%of homeowners
Avatar for Coy Plumbing & Heating
Coy Plumbing & Heating
5.0(
8
)
Tankless Water Heater - Repair

Serving Dover, NH and surrounding areas

In business since 2024

Free estimates

Emergency services offered

"I highly recommend Mitchell for any plumbing that needs to be done for anybody. He is honest, Also, very neat. And he shows a lot of pride in his work, and I am 73 years old, I have seen a lot of plumbers, some. I will never recommend like daigo plumbing. Stay away from him. But Mitch is number one and I respect everything that he's done for me today. Great worker. On time and takes a lot of pride in his work. I'm very happy to have him here today. He was godsend to me, so thank you, Mitch. I will recommend you to anybody of my friends, our family or anyone that calls on a plumber. Your name will come up and that's a guaranteed. I will never call anybody else's again, but you Thank you for your help. As far as I am concerned, you are number one. There's no one above you and I have seen like I said, and dealt with a lot of plumber, so thank you again. You stay safe, cause the people Do need plumber like you. Stay safe."
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+4

Response time2 days
Response rate100%
Recommended by87%of homeowners
Avatar for TJ Thistlewood Plumbing & HVAC
TJ Thistlewood Plumbing & HVAC
5.0(
6
)
Tankless Water Heater - Repair

Serving Dover, NH and surrounding areas

Emergency services offered

"Tyler & his team were very professional and thorough with repairing my tankless water heater. Tyler was quick to respond to my call for a repair service call and took the care to be as neat as possible during the repair and cleaned up nicely when the service was completed. TOP NOTCH !!!"
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+1

Recommended by100%of homeowners
Avatar for Heritage Home Service
Heritage Home Service
4.0(
465
)
Tankless Water Heater - Repair

Serving Dover, NH and surrounding areas

In business since 1986

Free estimates

Emergency services offered

"They came out when they said they would, diagnosed the problem and gave me a quote for repair/replacement during the visit. Within a few days they scheduled the replacement work."
Oil tank installation
Water filtration
Celing fan installed.
Outdoor condenser unit.
Garbage disposal installed under kitchen sink.

+14

Response time10 hrs
Response rate100%
Recommended by75%of homeowners
Avatar for DF Richard Energy
DF Richard Energy
4.1(
31
)
Tankless Water Heater - Repair

Serving Dover, NH and surrounding areas

In business since 1932

Free estimates

Emergency services offered

"Great! The owner, DF Richard, came out personally before our first filling to introduce himself and explain everything. Shortly afterwards, we had a wicked bad storm and lost power for 2 days, so we really needed the propane. They even topped off my tanks during the power outage, not because I called, but because the driver was in our area and wanted to be sure that we had enough fuel to keep our generator running until power was restored. Awesome customer service!!"
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Recommended by80%of homeowners
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