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

Avatar for Domination Plumbing and Heating
Domination Plumbing and Heating
4.6(
23
)
Tankless Water Heater - Repair

Serving South Lancaster, MA and surrounding areas

Approved

In business since 2011

Free estimates

Warranties offered

"After spending 2 days trying to find someone to replace my hot water heater, Home Advisor recommended this company. They fit me into their schedule the same day and it was installed about 4 hours after my initially contact with them. Casey and Phil were great. Had them look at a couple of other minor future projects to do while they were here. Will definitely hire them again."
Custom Work
Custom Work
Custom Work
Custom Work
Custom Work

+20

Response time4 hrs
Response rate96%
13 neighbors recently requested a quote
Avatar for Advanced Energy Concepts of Worcester, Inc.
Advanced Energy Concepts of Worcester, Inc.
3.8(
140
)
Tankless Water Heater - Repair

Serving South Lancaster, MA and surrounding areas

Approved

In business since 1990

Free estimates

Emergency services offered

"Could not be happier with the install of our new propane system. They were very easy to work with Quinn answered all my questions Doug and Bernie and I forget the other guys name were a pleasure to have in my house. They did the work and the Quoted amount of time. They handled all the inspections and permits with the town. Extremely happy with the level of service and would recommend to anybody looking for heating needs. Edit from 2 years ago?. The company still has not picked up old water heater and boiler. Have called a number of times to get this done. Vicki is extremely unpleasant to deal with. Rude. Has zero phone skills. Should really look into finding a new person to answer the phones. She was basically yelling at me for asking, follow up questions. And when I I said, why are you yelling? She said so you would know if I was yelling at you. But she definitely was yelling. I really hope those phone calls are recorded. They?ve got their money. So obviously the customer service ha"
Response time3 days
Response rate85%
33 neighbors recently requested a quote
A & B Plumbing Service
4.3(
149
)
Tankless Water Heater - Repair

Serving South Lancaster, MA and surrounding areas

In business since 2013

Credit card accepted

"We hired A & B plumbing Service in March, 2017. (For some reason my review was not posted to the Home Advisor site.) Al was really great! I contacted Al because I thought I needed to replace 2 water shut off valves that were leaking. Upon inspection by Al, he determined that one of them just needed an adjustment inside and the other just needed new "guts". Al made both repairs and verified there were no more leaks. Everything was neat and tidy at the end of the job and it ended up costing less than expected! Al is certainly extremely knowledgeable and professional. I will definitely call on him for any future plumbing needs!"
Response time1 day
Recommended by95%of homeowners
Avatar for Pro Comfort Control
Pro Comfort Control
5.0(
20
)
Tankless Water Heater - Repair

Serving South Lancaster, MA and surrounding areas

In business since 2016

Credit card accepted

"We contacted Pro Comfort Control to bid on the installation of a ductless mini-split in our sunroom. With many companies the person who shows up is essentially a salesperson and isn't as knowledgeable about the systems and the intricates of installing them...not so with Ryan. He was able to answer every question and explain why he was answering in a specific way related to the individual peculiarities of our house. The quote was very competitive and they use great equipment and materials. The Office Manager Alex was easy to work with in regards to scheduling and any additional questions. Installation was great and as an added bonus they smelled gas in the crawlspace while installing the lines and quickly replaced a corroded propane line for our hot water heater. You will not find a better partner for all your home cooling and heating needs."
Ductless Mini Split A/C Heat Pump
Heating & A/C Project
Heat pump condenser
After
Heating and Air Conditioning Project

+74

Recommended by100%of homeowners
Avatar for Wachusett Plumbing Services
Wachusett Plumbing Services
4.6(
11
)
Tankless Water Heater - Repair

Serving South Lancaster, MA and surrounding areas

Free estimates

Emergency services offered

Credit card accepted

"Dennis did an excellent job replacing our electric water heater! We noticed our old one leaking one evening, and Dennis was VERY fast to respond to my Angi request for service. He was out the next day to install our new water heater and arrived promptly at the promised time. From start to finish, Dennis completed the work in just over 2 hours. He cleaned up the area nicely and took our old water heater with him. A+ 5-Star service for sure! Would highly recommend this friendly professional for your plumbing needs. :)"
Recommended by100%of homeowners
Avatar for All Phases Mechanical
All Phases Mechanical
4.5(
75
)
Tankless Water Heater - Repair

Serving South Lancaster, MA and surrounding areas

In business since 1983

Free estimates

Emergency services offered

"Our experience with All Phases Mechanical has been excellent. On the first occasion we used APM, we lost heat during a cold snap in the middle of winter. We called in the morning and a technician arrived that afternoon and quickly determined that not only was our 20 year old furnace in need of expensive repairs (which a friend of ours in the construction industry validated), but continuing to run it would potentially result in a carbon monoxide hazard to my family. Carl gave us clear options and helped us understand benefits (rebates, no interest loans, etc.) that are available from the state to assist families in our predicament. We decided to move forward with a new furnace and Carl's team installed it the next day. On the second occasion, APM helped us our central air conditioning system. Again, Carl sent a technician who arrived promptly the same day, who determined that the air conditioning system was fine but it wasn't working properly due to faulty wiring. He quickly fixed it and was on his way - all at no charge. I can't say enough about All Phases Mechanical. If you're looking for a local company that cares about its customers (and understands that heating and cooking problems need to be addressed quickly), All Phase Mechanical is the company you should use."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+6

Recommended by90%of homeowners
Avatar for RezySave Plumbing and Heating
RezySave Plumbing and Heating
4.9(
23
)
Tankless Water Heater - Repair

Serving South Lancaster, MA and surrounding areas

Warranties offered

Small jobs welcome

Credit card accepted

"Had mike and zach out to replace my gas water heater. They were on time, professional, and courteous of my home. They even wear shoe covers and use drop mats to make sure the floors dont get dirty! Excellent customer service at a reasonable price"
Water heater install
Hybrid water heater
16 neighbors recently requested a quote
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