Top-rated tankless water heater installers.

Get matched with top tankless water heater installers in Waltham, MA

Enter your zip and get matched with up to 3 pros

Matching on HomeAdvisor

Share some details icon
Share some details about your home project.
Match with local pros icon
Within moments, match with highly-rated local pros.
Compare quotes icon
Compare quotes and choose the best pro for the job.

Find Tankless water heater installers in Waltham

Avatar for Mouradian Plumbing & Heating
Mouradian Plumbing & Heating
5.0(
43
)

Serving Waltham, MA and surrounding areas

Approved

In business since 2001

Free estimates

Credit card accepted

"I had an outstanding experience with this plumbing and heating company, led by Eric and his team. They not only provided exceptional service but also installed a top-notch tankless water heater for us. From their fairness in pricing to the timeliness of their work, they consistently went above and beyond. Communication was excellent throughout the process. I highly recommend this company for their expertise and exceptional service."
Rinnai combination boiler
Response time2 days
13 neighbors recently requested a quote
Recommended by93%of homeowners
Avatar for S&S Piping and Heat LLC
S&S Piping and Heat LLC
5.0(
55
)

Serving Waltham, MA and surrounding areas

Approved

Super Service Award Winner

In business since 2006

Free estimates

Emergency services offered

"Neo was excellent! My water heater went and a new one was installed by Neo and his team the next day. They were very professional, communicated instantly, and did a fantastic job. Will definitely use S.S Piping n Heat for all of my future plumbing and heating needs. Would recommend this company to anyone!"
Metro Construction Design
Metro Construction Design
Metro Construction Design
Metro Construction Design
Metro Construction Design

+53

Response time7 hrs
Response rate100%
18 neighbors recently requested a quote
Floros Plumbing and Heating
5.0(
376
)

Serving Waltham, MA and surrounding areas

Approved

Emergency services offered

Customers say: Quality work

"Mr. Floros worked with my schedule on a short timeline to replace our water heater. He professionally negotiated with me about how to get the job done approximately the way that I wanted while still meeting local code. When the job was completed, he cleaned up and took away the old unit. The price was a great value considering the work done."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+3

Response time1 day
1 neighbors recently requested a quote
Recommended by97%of homeowners
Avatar for H L Bowman
H L Bowman
4.7(
387
)

Serving Waltham, MA and surrounding areas

Approved (Corporate)

In business since 1946

Free estimates

Emergency services offered

"They were very fast to respond to my call and were able to send someone within two hours. The replacement of the hot water heater went well. For the water pipes they use copper crimp fittings instead of soldering so it will be interesting to see how that holds up over the years. My only concern is how they ran the gas line. They use Gastite CSST which is fine, but the CSST is run so it goes downward then back up and then downward again before it enters black pipe that has a moisture trap. It seems to me that if there is any moisture it will end up in the CSST instead of the trap. In addition, there is a pretty good bend in the CSST right before it goes into the trap section. Also, Teflon tape was used on the all the joints instead of joint compound. I think I will get someone from a different company to come in and take a look at it."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+6

329 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Genove Oil & Air Co
Genove Oil & Air Co
4.8(
191
)

Serving Waltham, MA and surrounding areas

Approved

In business since 1977

Free estimates

Emergency services offered

"We were very pleased with the work that the Genove technicians did. They removed our 40-year-old gas boiler and associated water heater and replaced it with a new system. They tested the new system carefully, put explanatory tags on all of the relevant pipes and faucets, and cleaned up well. The team members were polite and worked hard. We had similarly good experiences when Genove technicians came to repair our central AC system. They were knowledgeable and efficient, got the system going again, and the price was fair. We continue to use this company for heating and AC repairs."
Additional Photos
Additional Photos
Additional Photos
Pics
Pics

+2

Response time1 day
13 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for Gentille Plumbing and Heating
Gentille Plumbing and Heating
5.0(
25
)

Serving Waltham, MA and surrounding areas

Approved

Super Service Award Winner

In business since 2025

Free estimates

Credit card accepted

"I called Ryan for my water heater leaking. He came within the same day, ready to go and replaced it quickly. He provided a great service and affordable price. Highly recommend him for any plumbing needs. "
Response time6 hrs
Response rate94%
Avatar for Heavy Doody Plumbing & Heating
Heavy Doody Plumbing & Heating
4.9(
19
)

Serving Waltham, MA and surrounding areas

Approved

In business since 2013

Emergency services offered

Small jobs welcome

"Brian and his crew were great. Brian came out and gave a great estimate for everything I needed. He was very responsive via email as we worked to schedule a time for his crew to come do the work, which was mainly water tank and heating system maintenance. Brian brought Jim promptly and explained the work. They then pointed out a couple of things that they recommended replacing, one they just included in the original cost estimate and another they added on due to additional parts being purchased. Jim was very thorough and professional and, by all accounts, did great work. I’ll be using Heavy Doody for all of my future plumbing and heating needs!"
back flow  for sprinkler sytym
2nd meter install
finish
finish
finish

+26

Response time4 hrs
4 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for Sila Heating, Cooling, Plumbing and Electrical
Sila Heating, Cooling, Plumbing and Electrical
4.7(
4,793
)

Serving Waltham, MA and surrounding areas

Approved (Corporate)

In business since 1989

Free estimates

Emergency services offered

"I've called Sila before to work on my HVAC unit and realized they offer plumbing services when my tank-less water heater stopped working. They were able to come by that day I called to see what was wrong. Once they were onsite they deterimed my hot water valve stopped working and were able to replace it and got my hot water working in no time."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+6

Response time2 days
56 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for Cotti-Johnson Heating-Cooling-Electrical
Cotti-Johnson Heating-Cooling-Electrical
4.8(
150
)

Serving Waltham, MA and surrounding areas

Approved (Corporate)

Super Service Award Winner

In business since 1948

Free estimates

Emergency services offered

"The installers came out on time at 8:30 am and completed the installation later that evening. Explained everything, labeled all the pipes, and were careful to put everything back in place and clean up before they left. Overall very professional and polite. Would definitely recommend this company."
Navien Install
Backflow
Outdoor Shower
Well Tank Replacement
Filtration Installation

+62

Response time10 hrs
81 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Mouradian Plumbing & Heating
Mouradian Plumbing & Heating
5.0(
17
)

Serving Waltham, MA and surrounding areas

Approved

In business since 2000

Free estimates

Emergency services offered

"Eric Mouradian (owner) responded promptly to my request for urgent replacement of a newly-broken hot water heater. He showed up on time, provided outstanding service, cleaned up after the job, and charged a reasonable price. Highly recommended!!"
Response time1 day
1 neighbors recently requested a quote
Recommended by100%of homeowners
Showing 1-10 of 27

The Waltham, MA homeowners’ guide to tankless water heater installations

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