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Top-Rated Water heater repair or service pros in Nashua - Updated Nov 2026

Avatar for Robert Johnson Plumbing
Robert Johnson Plumbing
5.0(
328
)
Water Heater - Repair or Service

Serving Nashua, NH and surrounding areas

Approved

Super Service Award Winner

In business since 2009

Free estimates

Customers say: True professional

"Robert gave such amazing service and installed our water heater the same day I contacted him. !He was very reasonable with his pricing with no hidden costs and the water heater looks and runs great. Thankyou Robert!"
Response time2 hrs
Response rate96%
37 neighbors recently requested a quote
Joe Belanger, Plumbing Services
4.5(
130
)
Water Heater - Repair or Service

Serving Nashua, NH and surrounding areas

Approved

In business since 2003

Free estimates

Customers say: Quality work

"Our water heater burst over the weekend. We were desperate to get it replaced first thing Monday. Joe returned our call immediately, gave us a more than reasonable quote, was here close to noon, installed new equipment..voila HOT WATER again! Really efficient, nice guy, great job!! I highly recommend him!"
Buderus oil fired forced hot water heating system
Oil fired buderus
Navien 150 high efficiency wall mounted boiler
Water heater
Powervented water heater

+1

Response time7 hrs
Recommended by94%of homeowners
Avatar for Daigle Plumbing Heating and Cooling
Daigle Plumbing Heating and Cooling
4.4(
43
)
Water Heater - Repair or Service

Serving Nashua, NH and surrounding areas

Approved

In business since 1981

Free estimates

Credit card accepted

"John Maloney Hudson, NH The repair was completed today in an excellent and professional manner. I was completely satisfied with the repair and replacement of the damaged toilet seals and flange. I recommend Daigle Plumbing for all my future needs for sure. Great service great efficient work. Thanks"
9 ZONE On Boiler
3 Zone Boiler
4 Zone Boiler with storage Tank!!!
Oil Tank
6 Zone Boiler W/Storage Tank

+12

Response time1 day
109 neighbors recently requested a quote
Recommended by63%of homeowners
Avatar for A Really Good Plumber
A Really Good Plumber
4.5(
46
)
Water Heater - Repair or Service

Serving Nashua, NH and surrounding areas

Approved

In business since 2007

Emergency services offered

Credit card accepted

"He was very knowledgeable and very friendly and his prices are very reasonable compared to other contractors and he did a great job installing wyn well tank I would definitely recommend him for any repairs"
Additional Photos
Additional Photos
3 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Expedition Plumbing
Expedition Plumbing
5.0(
22
)
Water Heater - Repair or Service

Serving Nashua, NH and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

"?I couldn't be happier with my new water heater installation. The team was professional, punctual, and incredibly efficient. They took the time to explain the new unit's features and ensured the workspace was spotless before leaving. ?It?s a relief to have hot water back with zero stress. If you need a reliable install, I highly recommend Expedition!"
65 neighbors recently requested a quote
Avatar for Heritage Home Service
Heritage Home Service
4.1(
1,337
)
Water Heater - Repair or Service

Serving Nashua, NH and surrounding areas

Approved (Corporate)

In business since 1988

Free estimates

Emergency services offered

"I asked for a rep to come to give quotes for repair or replacement of my gas boiler. Before he came the old boiler failed, and Heritage was able to quickly install a new one so that we without heat and hot water for only a short time."
Grand opening of new location
Team breakfast
Events
Billy working hard
Golf tournament

+29

Response time5 hrs
357 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Pine Valley Plumbing
Pine Valley Plumbing
5.0(
6
)
Water Heater - Repair or Service

Serving Nashua, NH and surrounding areas

Approved

In business since 2024

Free estimates

Offers commercial services

We are a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We offer a variety of General Contractor services that are customizable to each individual project. You will find us to be competitively priced, paying close attention to the details of each and every project that we are involved with. We look forward to building lasting relationships and guarantee your satisfaction! \n \n

On the job
On the job
On the job
On the job
On the job

+2

Recommended by16%of homeowners
Avatar for Water Heater Installation ProfessionalsWHIP
Water Heater Installation ProfessionalsWHIP
4.6(
164
)
Water Heater - Repair or Service

Serving Nashua, NH and surrounding areas

In business since 2007

Free estimates

Emergency services offered

"This is my 3rd service call completed by Peterson Plumbing.  The bearings on my disposer were going, making a nasty noise.

I bought a replacement unit and had Paterson replace it.  the job was done properly and promptly and for a price that makes doing it yourself a thing of the past.  He cleaned up and left the place the way he found it.

Thus another job by Peterson was completed."
Navien water heater
Navien Combi Boiler
HTP Firetube
Recommended by95%of homeowners
...
Showing 1-10 of 63
FAQs for water heater repair or service projects in Nashua, NH

Warning signs include fluctuating water temperatures, a pilot light that repeatedly goes out, unusual noises from the tank, or complete heating failure. You might also detect a rotten egg smell, indicating a potential gas leak, or notice water that never reaches the proper temperature. If your water heater is over eight years old and displaying these symptoms, the gas valve is a likely culprit. Professional inspection is recommended, especially if gas odors are present.

Water heater gas valves are not universally interchangeable. Each valve must match your specific water heater's make, model, and specifications. Important compatibility factors include gas type (natural gas vs. propane), BTU rating, connection types, and physical dimensions. Using an incorrect valve can result in poor performance, premature failure, or dangerous gas leaks. Always consult your water heater's documentation or a professional plumber to identify the appropriate replacement valve for your unit.

The Nashua, NH homeowners’ guide to water heater repair or services

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