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

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

Serving Newmarket, NH and surrounding areas

Approved

Super Service Award Winner

In business since 2009

Free estimates

Customers say: True professional

"I had Rob install a tankless hot water heater, whole house water filter, and run a new gas line for my gas stove conversion. He was very professional and and was quick to set an appointment. The whole job took a single day and he even removed and disposed of the old outdated appliances. Quality work at reasonable prices! Would highly recommend."
Response time2 hrs
Response rate96%
39 neighbors recently requested a quote
Wanda's Water Heaters
4.9(
12
)
Tankless Water Heater - Repair

Serving Newmarket, NH and surrounding areas

Approved

Super Service Award Winner

In business since 2020

Free estimates

Credit card accepted

"Wanda?s is awesome! My old electric hot water heater tank finally retired to the recycling bin. I called on Tuesday evening and spoke to a knowledgeable technician named Chad. I told him what my old unit was doing and he said it definitely needs a replacement after 17 years. He then asked how the home is heated. And then gave me the 2 options for my home. He patiently explained the differences between the hybrid heat pump unit vs the electric one that was presently on its way out. He answered all my newbie questions. He explained the pricing between the two units. I told him I have to discuss everything with the cfo and I would call back Wednesday morning. He also told me they would get me on the schedule for tomorrow or the next day. That was amazing. I called the next day and spoke with Amanda to schedule me in the following day. Chad showed up the following morning and did an awesome job. He was very polite and knew his job well. I am very satisfied so far with Wanda?s."
Installation of boiler
Response time1 day
2 neighbors recently requested a quote
Recommended by8%of homeowners
Avatar for TJ Thistlewood Plumbing & HVAC
TJ Thistlewood Plumbing & HVAC
5.0(
6
)
Tankless Water Heater - Repair

Serving Newmarket, NH and surrounding areas

Emergency services offered

"Tyler was extremely helpful and accommodating and helped me on very short notice with 2 plumbing projects recently, even spending almost an entire Saturday working when a washing machine install ended up being more work than expected. He is professional and extremely reasonably priced. Will definitely recommend and use for all of my plumbing needs."
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+1

Recommended by100%of homeowners
Avatar for GMR Mechanical
GMR Mechanical
4.4(
56
)
Tankless Water Heater - Repair

Serving Newmarket, NH and surrounding areas

In business since 2008

Free estimates

Emergency services offered

"Gil was very professional and he took a lot of pride in his work. He did not take any corner when faced with problems and he made sure everything was done correctly and to code. Gil gave a reasonable quote after inspecting our old system to replace with a new heat pump. Installation were delayed due to personal issues but when we really needed heating once the temperature were dropping, he made it his priority to finish it. During installation there were issues with the old duct work which made the work more difficult. He didn't upcharge us at all to fix it. We very much appreciated in working with him and would gladly repeat doing business."
Recommended by83%of homeowners
Avatar for DF Richard Energy
DF Richard Energy
4.1(
31
)
Tankless Water Heater - Repair

Serving Newmarket, 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
Avatar for Climate Design Systems, LLC
Climate Design Systems, LLC
5.0(
5
)
Tankless Water Heater - Repair

Serving Newmarket, NH and surrounding areas

In business since 1946

Free estimates

Emergency services offered

Climate Design Systems has been around since 1946! We are an HVAC & Plumbing company that is full licensed to serve Massachusetts, New Hampshire, and southern Maine. We pride ourselves on quality workmanship and outstanding customer service. There is no job too big or too small! \n\nWe offer Residential & Commercial HVAC services such as;\n\n-maintenance\n-repair\n-replacement/retrofit\n-new construction\n\nWe offer Residential & Commercial Plumbing services such as;\n\n-water leak repair\n-drain repair\n-fixture replacement\n-boiler repair & installation\n-water heater repair & installation\n-water treatment\n\n

Burnham MPO Boiler
bosch condensers
bosch furnace
bosch furnace 2
condensers

+20

Avatar for DiPietro Heating & Cooling
DiPietro Heating & Cooling
3.7(
46
)
Tankless Water Heater - Repair

Serving Newmarket, NH and surrounding areas

In business since 2006

Emergency services offered

Credit card accepted

"Can I give an "A+" rating? Reached out to a handful of HVAC contractors to get a quote on replacing my 20 year old central air system. From the woman who I initially spoke with to the guy who came out to give me a quote (who happened to own the company) to the crew that came out to do the project, I got first class service. I scheduled the initial visit and Joe arrived 15 minutes early. He gave me a handful of quotes and was very clear on the differences between the systems. I settled on one of the lesser priced systems and never felt like he was trying to "up-sell" me. In fact the system I purchased qualified me for a rebate from my energy provider. I was able to schedule the install for 2 days later and again, the team showed up right on time. The guys were personable, respectful of my home, and very hard working. I have a brand new central air that seems to be working perfectly. It's significantly quieter than my old system. They cleaned up any mess that was made and gave me a complete walk through of my new system. I could not be happier."
High efficiency Trane XL16i system
High efficiency Burnham Boiler
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+3

Recommended by66%of homeowners
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