Top-rated tankless water heater repair pros.

Get matched with top tankless water heater repair pros 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 repair pros in Waltham

"Ken is the best!!! Top quality installationâ ¦very professionalâ ¦honest and sincere. Ken has performed many tasks for me in the past and has never ceased to amaze me or let me down. If you want a job done right, you canâ  t go wrong with Ken!!!"

Nancy C on December 2021

Whatever plumbing or heating problem you have can be fixed right for a reasonable price. I accept Cash, Check, Credit Cards, PayPal, Venmo, and more.

"Ken is the best!!! Top quality installationâ ¦very professionalâ ¦honest and sincere. Ken has performed many tasks for me in the past and has never ceased to amaze me or let me down. If you want a job done right, you canâ  t go wrong with Ken!!!"

Nancy C on December 2021


Avatar for SP Mechanical Service

SP Mechanical Service

5.00(
1
)
Approved Pro

SP Mechanical Service

5.00(
1
)
Approved Pro
Free onsite estimate

Call SP Mechanical Service for all your gas plumbing and plumbing needs. We specialize in Water Heater and Gas Boiler installation, but we're happy to help with any of your plumbing or heating needs! Give us a call at (978) 736-0158.

"All completed as agreed, very professional. Recommend 100%"

Hernen C on December 2025

Call SP Mechanical Service for all your gas plumbing and plumbing needs. We specialize in Water Heater and Gas Boiler installation, but we're happy to help with any of your plumbing or heating needs! Give us a call at (978) 736-0158.

"All completed as agreed, very professional. Recommend 100%"

Hernen C on December 2025


Avatar for Genove Oil & Air Co

Genove Oil & Air Co

4.80(
191
)
Approved Pro

Genove Oil & Air Co

4.80(
191
)
Approved Pro
Customers say: Super punctual
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers
74 local quotes requested

Genove Oil & Air provides Bioheat & oil delivery as well as residential and commercial installation/service for oil & gas heating units, water heaters, heat pumps, central A/C and ductless HVAC systems. As a complete energy company, we offer our customers modern energy efficient heating and cooling options. We take pride in what we do, making excellent customer service our top priority! Based in Waltham, serving Eastern Massachusetts, Metrowest, and Greater Boston since 1977.

"Got the job done. I don’t know if it could’ve been a little more in depth. They kind of just sprayed it with a cleaner and checked the temps, and a few weeks later, my AC is now dripping water."

Yvonne F on July 2024

Genove Oil & Air provides Bioheat & oil delivery as well as residential and commercial installation/service for oil & gas heating units, water heaters, heat pumps, central A/C and ductless HVAC systems. As a complete energy company, we offer our customers modern energy efficient heating and cooling options. We take pride in what we do, making excellent customer service our top priority! Based in Waltham, serving Eastern Massachusetts, Metrowest, and Greater Boston since 1977.

"Got the job done. I don’t know if it could’ve been a little more in depth. They kind of just sprayed it with a cleaner and checked the temps, and a few weeks later, my AC is now dripping water."

Yvonne F on July 2024


Avatar for Addario, Inc.

Addario, Inc.

4.00(
236
)
Approved Pro

Addario, Inc.

4.00(
236
)
Approved Pro
Customers say: True professional
371 local quotes requested
27 years of experience

Over 70,000 Massachusetts homeowners trust Addario's for peace of mind. For nearly 30 years, we've kept homes comfortable with heat that stays on, clean water, and reliable systems. We've served 50,000+ families with true craftsmanship and integrity. A+ BBB rated with the region's strongest warranty, we're the company your neighbors recommend. As one of the state's fastest-growing companies, we're licensed, insured, and fully equipped for plumbing, heating, cooling, electrical, drain cleaning, sewer replacement, generators, bathroom remodels, and more. Our 50+ expert team doesn't just fix problems—we prevent them. Every service includes a personalized Homeowner's Maintenance Checklist to protect your investment. When your heating or cooling isn't working right, we don't guess. We fix it fast, completely, and correctly the first time. You just call Addario's—and consider it handled.

"On time and work completed quickly"

Travis G on December 2025

Over 70,000 Massachusetts homeowners trust Addario's for peace of mind. For nearly 30 years, we've kept homes comfortable with heat that stays on, clean water, and reliable systems. We've served 50,000+ families with true craftsmanship and integrity. A+ BBB rated with the region's strongest warranty, we're the company your neighbors recommend. As one of the state's fastest-growing companies, we're licensed, insured, and fully equipped for plumbing, heating, cooling, electrical, drain cleaning, sewer replacement, generators, bathroom remodels, and more. Our 50+ expert team doesn't just fix problems—we prevent them. Every service includes a personalized Homeowner's Maintenance Checklist to protect your investment. When your heating or cooling isn't working right, we don't guess. We fix it fast, completely, and correctly the first time. You just call Addario's—and consider it handled.

"On time and work completed quickly"

Travis G on December 2025


Avatar for Mr. Rooter Plumbing of Southern Mass

Mr. Rooter Plumbing of Southern Mass

4.12(
562
)
Approved Pro

Mr. Rooter Plumbing of Southern Mass

4.12(
562
)
Approved Pro
Customers say: True professional
35 years of experience
Emergency services offered

Mr. Rooter Plumbing of Southern Mass is your premier professional plumbing company offering the highest quality and most attentive customer service. We are known to pay exquisite attention to detail while making customer satisfaction our top priority. Please call us today to schedule your appointment! Mr. Rooter is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers interests and make their concerns the basis of our business. Please give us a call today!

"The plumber arrived on schedule and did a fine job clearing the clogged drain. We will definitely use them again if the need arrises. "

John H on November 2025

Mr. Rooter Plumbing of Southern Mass is your premier professional plumbing company offering the highest quality and most attentive customer service. We are known to pay exquisite attention to detail while making customer satisfaction our top priority. Please call us today to schedule your appointment! Mr. Rooter is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers interests and make their concerns the basis of our business. Please give us a call today!

"The plumber arrived on schedule and did a fine job clearing the clogged drain. We will definitely use them again if the need arrises. "

John H on November 2025


Avatar for Landry Mechanical, Inc.- Plumbing

Landry Mechanical, Inc.- Plumbing

4.62(
95
)
Approved Pro

Landry Mechanical, Inc.- Plumbing

4.62(
95
)
Approved Pro
Customers say: Quality work
423 local quotes requested
17 years of experience

In 2008, Landry Mechanical Inc Plumbing HVAC & Electric began serving residents throughout Worcester and Middlesex County. We started out just serving 20 systems a year and working on systems that our competitors ignored, such as wood systems or alternative energy systems. In putting our customers first, our reputation for quality work grew, as did our business.

"Very professional,on time and kept me informed.Did a great job, looks great!"

Scott P on September 2025

In 2008, Landry Mechanical Inc Plumbing HVAC & Electric began serving residents throughout Worcester and Middlesex County. We started out just serving 20 systems a year and working on systems that our competitors ignored, such as wood systems or alternative energy systems. In putting our customers first, our reputation for quality work grew, as did our business.

"Very professional,on time and kept me informed.Did a great job, looks great!"

Scott P on September 2025


Avatar for Borels Plumber Inc

Borels Plumber Inc

5.00(
8
)
Approved Pro

Borels Plumber Inc

5.00(
8
)
Approved Pro
7 years of experience
Free onsite estimate

We take great pride in our experience, expertise, quality and customer service, that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship, and complete customer satisfaction, from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate, with every customer in a professional manner. Our reputation is based on service, safety and quality, regardless of how large, or small the job. Call us today!

"These guys are great. Water heater broke and was leaking all over the cellar. They replaced my water heater and had everything done within a couple of hours. Highly recommend them and I will definitely use them again. "

Sean D on November 2025

We take great pride in our experience, expertise, quality and customer service, that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship, and complete customer satisfaction, from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate, with every customer in a professional manner. Our reputation is based on service, safety and quality, regardless of how large, or small the job. Call us today!

"These guys are great. Water heater broke and was leaking all over the cellar. They replaced my water heater and had everything done within a couple of hours. Highly recommend them and I will definitely use them again. "

Sean D on November 2025


"Top notch vikki had her guys here asap to check my old a/c unit out when the tech said it was gone that Monday the appraiser came out 2 days after that had quote and a week after that install in 1 day . Guys where awesome new what they where doing had it done in no time... highly recommend for any a/c our heating issues awesome people..thank you advance especially vikki she was awesome. "

Leo B on July 2025

Advanced Energy Concepts was established in your community in 1990. Our main focus is energy conservation. Advanced Energy concepts also does a variety of plumbing services for your residential home

"Top notch vikki had her guys here asap to check my old a/c unit out when the tech said it was gone that Monday the appraiser came out 2 days after that had quote and a week after that install in 1 day . Guys where awesome new what they where doing had it done in no time... highly recommend for any a/c our heating issues awesome people..thank you advance especially vikki she was awesome. "

Leo B on July 2025


Avatar for O'Brien Plumbing Works

O'Brien Plumbing Works

4.28(
20
)
Approved Pro

O'Brien Plumbing Works

4.28(
20
)
Approved Pro
Customers say: Quick response
40 years of experience
Free onsite estimate

O'Brien Plumbing Works is a locally owned and operated company that values honesty and integrity in all aspects of our business. Our dedicated team of professionals have over40 years of hands on experience to provide innovative ideas and suggestions tailored to your projects.We are a full service companey for all of your plumbing and heating needs Our services are customized to your individual needs, paying close attention to the details of each project that we are involved with. Please feel free to contact us today!

"I would thank them for the work and services. Max was very prompt and polite. We were definitely taken aback with the bill. We were not informed about any of the charges around: 1. Time taken for pulling the permit(1hour@$180) 2. Time for inspector coming in(1hour@$180) 3. Price for permit These 3 costs total to $425. The material cost of $263 definitely seemed marked up. * I wish they had mentioned about expecting these costs so that we could make an informed decision. * We have had several permits pulled in last year ( had frozen pipe burst situation so had renovations going on for multiple months) and never were charged for the time taken to pull permit or for inspectors time at the time of inspection. * Max mentioned it was going to be $180 an hour and you were here for 2 hours from start to end.. The father(Peter) kept mentioning about the emergency charges that there are plumbers that charge $300 an hour, I was clear that we were okay with waiting for a couple of days so there was no question of those charges being applied. He kept giving an explanation of the bill being high enough but it seemed very vague. We were charge $1100 for 2 hours of work to fix a slow gas leak that National grid had identified and pointed to us so they shut of our gas supply. National grid guys had told us that it would be only 1-2 hours of plumbing work. I would not recommend them for sure for the sour taste it has left for us. I wish we went with presidential plumbing or 128 plumbing that we have gone in the past. They are expensive but you know the quote before hand."

Angela K on January 2024

O'Brien Plumbing Works is a locally owned and operated company that values honesty and integrity in all aspects of our business. Our dedicated team of professionals have over40 years of hands on experience to provide innovative ideas and suggestions tailored to your projects.We are a full service companey for all of your plumbing and heating needs Our services are customized to your individual needs, paying close attention to the details of each project that we are involved with. Please feel free to contact us today!

"I would thank them for the work and services. Max was very prompt and polite. We were definitely taken aback with the bill. We were not informed about any of the charges around: 1. Time taken for pulling the permit(1hour@$180) 2. Time for inspector coming in(1hour@$180) 3. Price for permit These 3 costs total to $425. The material cost of $263 definitely seemed marked up. * I wish they had mentioned about expecting these costs so that we could make an informed decision. * We have had several permits pulled in last year ( had frozen pipe burst situation so had renovations going on for multiple months) and never were charged for the time taken to pull permit or for inspectors time at the time of inspection. * Max mentioned it was going to be $180 an hour and you were here for 2 hours from start to end.. The father(Peter) kept mentioning about the emergency charges that there are plumbers that charge $300 an hour, I was clear that we were okay with waiting for a couple of days so there was no question of those charges being applied. He kept giving an explanation of the bill being high enough but it seemed very vague. We were charge $1100 for 2 hours of work to fix a slow gas leak that National grid had identified and pointed to us so they shut of our gas supply. National grid guys had told us that it would be only 1-2 hours of plumbing work. I would not recommend them for sure for the sour taste it has left for us. I wish we went with presidential plumbing or 128 plumbing that we have gone in the past. They are expensive but you know the quote before hand."

Angela K on January 2024


"Ok!"

Dawn D on October 2021

At Maffei Plumbing and HVAC, LLC, we are committed to your comfort. With an experienced and qualified staff to provide quick service for any service needed. We can solve any problem with a friendly face. Give us a call for a free estimate.

"Ok!"

Dawn D on October 2021

...
Showing 1-10 of 1034