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Top-Rated Tankless water heater installers in Lexington - Updated Nov 2026

Avatar for Mouradian Plumbing & Heating
Mouradian Plumbing & Heating
5.0(
44
)
Tankless Water Heater - Install

Serving Lexington, MA and surrounding areas

Approved

In business since 2001

Free estimates

Credit card accepted

"Mouradian Plumbing and Heating were instrumental in our renovation, and I can’t say enough good things about them. We were in the process of purchasing a home and had a complex situation — we needed to replace a failed forced hot water radiator system with an entirely new heating system. It was a major decision, and from the initial inquiry, Eric was someone you immediately feel comfortable working with. He’s knowledgeable, patient, and transparent — and he genuinely wants the outcome to be right for the homeowner. He guided us through the decision-making process, solved problems calmly, and made sure everything was done correctly. He is truly the reason we were able to move forward with purchasing our home. His team is outstanding. They installed a complete Bosch heat pump system with gas backup, ran all new ductwork, and supported our kitchen and bathroom remodel, including the installation of a new Rinnai tankless water heater. They did a fantastic job."
Rinnai combination boiler
Response time2 days
7 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(
66
)
Tankless Water Heater - Install

Serving Lexington, 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 time1 day
Response rate100%
9 neighbors recently requested a quote
Avatar for H L Bowman
H L Bowman
4.6(
429
)
Tankless Water Heater - Install

Serving Lexington, MA and surrounding areas

Approved (Corporate)

In business since 1946

Free estimates

Emergency services offered

"Rob Quigley was awesome. Professional, efficient and knowledgeable. Couldn’t have had a better person to install my water heater. To HL Bowman—you better hang on to this guy! He’s an asset to your company."
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+6

485 neighbors recently requested a quote
Recommended by86%of homeowners
Avatar for Genove Oil & Air Co
Genove Oil & Air Co
4.7(
217
)
Tankless Water Heater - Install

Serving Lexington, MA and surrounding areas

Approved

In business since 1977

Free estimates

Emergency services offered

"Excellent. The serviceman arrived on time, was knowledgable. He explained what he was doing. He went right to work and completed his work in an appropriate amount of time. Very pleased with their work. Already set up an appointment for the fall heater tuneup!"
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+2

Response time12 hrs
Response rate100%
12 neighbors recently requested a quote
Avatar for Sila Heating, Cooling, Plumbing and Electrical
Sila Heating, Cooling, Plumbing and Electrical
4.5(
5,404
)
Tankless Water Heater - Install

Serving Lexington, MA and surrounding areas

Approved

In business since 1989

Free estimates

Emergency services offered

Live Your Most Comfortable Life with a Company You Trust. \nWe offer Same Day Service and Next Day Installation! \n \nSila has been the center of delighting homeowners since 1989, with our team of engineers, certified technicians, and system designers that are proud to deliver the highest level of expertise in the HVAC industry. Whether it?s a repair, replacement, installation, or service, we have an unwavering commitment to keeping you and your family comfortable and safe ? season after season. \nWe guarantee satisfaction and are proud to have earned over 7,000 ?A? ratings on Angie?s List and its prestigious Super Service Award!

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+6

66 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for Lund Plumbing & Heating, Inc.
Lund Plumbing & Heating, Inc.
4.9(
23
)
Tankless Water Heater - Install

Serving Lexington, MA and surrounding areas

Approved

In business since 1986

Free estimates

Emergency services offered

"John Lund was very professional in discussing my issue. He didn't try to sell me the newest hot item, but instead understood what I really needed and worked with me to make that happen. The quoted price was very reasonable. His team were very efficient and thorough in replacing the hot water heater. They found another issue that they put a temporary fix on. I would highly recommend Lund Plumbing and Heating."
Tankless On-Demand Water Heater
2 Combi Boilers
Steam Boiler
High Efficiency Boiler with Indirect Tank
Tankless On-Demand HWH

+1

Response time2 days
Response rate92%
2 neighbors recently requested a quote
Avatar for Gentille Plumbing and Heating
Gentille Plumbing and Heating
5.0(
28
)
Tankless Water Heater - Install

Serving Lexington, MA and surrounding areas

Approved

Super Service Award Winner

In business since 2025

Free estimates

Credit card accepted

"My grandson flushed his little yellow bus down the toilet Friday afternoon. I called several plumbers in the area. By late Saturday afternoon I had only 1 returned call saying they could come out Monday morning. A friend suggested I call Gentille Plumbing and Heating. I called them and they said they could come early Sunday morning. Ryan arrived promptly as promise and quickly determine how to approach the issue and retrieved the little yellow bus. Cleanup was quick and pricing fair. Ryan was professional , friendly and was on his way within 45 minutes of arrival. Thank You Gentille Plumbing and Heating"
Response time6 hrs
Response rate96%
25 neighbors recently requested a quote
Avatar for Local Plumbing & Heating
Local Plumbing & Heating
5.0(
12
)
Tankless Water Heater - Install

Serving Lexington, MA and surrounding areas

Approved

Super Service Award Winner

In business since 2020

Free estimates

Emergency services offered

"This is my sixth time using the service from Andrew at Local Plumbing and Heating. He is quickly available, efficient and thoughtful. He is trustworthy: I know he will take care of everything I asked for and thinking ahead for great ideas. I used his service for major home projects and I strongly recommend him for everything: from water heater tank replacement to gas lines installations."
Plumbing Project
Plumbing Project
Plumbing Project
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+14

1 neighbors recently requested a quote
Recommended by72%of homeowners
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