Top-rated tankless water heater installers.

Get matched with top tankless water heater installers in Leominster, 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 Leominster

Avatar for D Day Plumbing

D Day Plumbing

4.96(
38
)
Approved Pro

D Day Plumbing

4.96(
38
)
Approved Pro
Customers say: True professional
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
14 years of experience

- Closely follow the average True Cost Rate furnished on the Homeowners section of Home Advisor for labor costs - Show up on time and give up front estimates - Focus on service work and limited multi-day projects so my schedule remains fluid - Advocate on the customer's behalf shopping for best prices on quality materials and best practices to get jobs done to code at the best rate possible

"We had an issue with a Dry Well periodically backing up. Damian and the D Day Plumbing team were very professional and knowledgeable and provided an estimate with a couple different options and their related costs. They installed a new utility sink, sink pump, and needed piping and valves with tie ins to the main septic. They made improvement above and beyond the initial job breakdown, all the while staying within budget. I will certainly consider them again for any future work. Thank you Damian and the D Day Plumbing Team for a job very done!"

Jim K on July 2024

- Closely follow the average True Cost Rate furnished on the Homeowners section of Home Advisor for labor costs - Show up on time and give up front estimates - Focus on service work and limited multi-day projects so my schedule remains fluid - Advocate on the customer's behalf shopping for best prices on quality materials and best practices to get jobs done to code at the best rate possible

"We had an issue with a Dry Well periodically backing up. Damian and the D Day Plumbing team were very professional and knowledgeable and provided an estimate with a couple different options and their related costs. They installed a new utility sink, sink pump, and needed piping and valves with tie ins to the main septic. They made improvement above and beyond the initial job breakdown, all the while staying within budget. I will certainly consider them again for any future work. Thank you Damian and the D Day Plumbing Team for a job very done!"

Jim K on July 2024


Avatar for David M. Clay Plumbing& Heating

David M. Clay Plumbing& Heating

5.00(
17
)
Approved Pro

David M. Clay Plumbing& Heating

5.00(
17
)
Approved Pro
Super Service Award
Customers say: Quick response
Recommended by 94% of Angi customers
Recommended by 94% of HomeAdvisor customers
21 local quotes requested

Clay Plumbing & Heating a locally owned and operated family business, has established itself as a reliable and leading provider of plumbing and heating services for the Central Massachusetts area since 2007 with over 20 years of experience. Our team provides a full range of plumbing services including boiler and water heater installation and repair. Every member of our team is fully trained to quickly and accurately diagnose any plumbing work that needs to be done. That way, when you have a situation that requires a professional plumber, you’ll feel confident in calling the Clay Plumbing & Heating team for help. Give us a call or click to request a quote today! We are just around the corner to help you with any problem! We also offer up to 100% financing up to $65,000.

"He’s the best check and He guided me to make the best decision 100% recommend "

Simon D on January 2026

Clay Plumbing & Heating a locally owned and operated family business, has established itself as a reliable and leading provider of plumbing and heating services for the Central Massachusetts area since 2007 with over 20 years of experience. Our team provides a full range of plumbing services including boiler and water heater installation and repair. Every member of our team is fully trained to quickly and accurately diagnose any plumbing work that needs to be done. That way, when you have a situation that requires a professional plumber, you’ll feel confident in calling the Clay Plumbing & Heating team for help. Give us a call or click to request a quote today! We are just around the corner to help you with any problem! We also offer up to 100% financing up to $65,000.

"He’s the best check and He guided me to make the best decision 100% recommend "

Simon D on January 2026


"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


Walls Plumbing and Heating

4.83(
103
)
Approved Pro

Walls Plumbing and Heating

4.83(
103
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
11 years of experience

Walls Plumbing and Heating is a locally owned and operated company. We provide over 10 years of experience, and top notch customer service. Our owner, Kevin Walls, is on every project,so our customers always deal with a decision maker. Please call us to make sure your project is completed properly the first time.

"Kevin was highly recommended via a post I made on Facebook looking for a local plumber. He arrived at my home that day to assess the issue we had with our bathroom sink. He then told me his game plan for the following day to remedy our leaking, plugged drain. He showed up the following morning and by noon time he was finished. Left the bathroom in better shape than it was in. He even replaced the plunger in the sink because he noticed a small leak there too. Removed the wainscoting and removed the wall behind it and was able to reuse the wainscoting and trim mold back as if nothing was disturbed. I would highly recommend using him in the future and would refer him to my friends as well. Thank you Kevin and your crew!"

Mark D on December 2023

Walls Plumbing and Heating is a locally owned and operated company. We provide over 10 years of experience, and top notch customer service. Our owner, Kevin Walls, is on every project,so our customers always deal with a decision maker. Please call us to make sure your project is completed properly the first time.

"Kevin was highly recommended via a post I made on Facebook looking for a local plumber. He arrived at my home that day to assess the issue we had with our bathroom sink. He then told me his game plan for the following day to remedy our leaking, plugged drain. He showed up the following morning and by noon time he was finished. Left the bathroom in better shape than it was in. He even replaced the plunger in the sink because he noticed a small leak there too. Removed the wainscoting and removed the wall behind it and was able to reuse the wainscoting and trim mold back as if nothing was disturbed. I would highly recommend using him in the future and would refer him to my friends as well. Thank you Kevin and your crew!"

Mark D on December 2023


Avatar for SEAMUS BROWNE PLUMBING INC.

SEAMUS BROWNE PLUMBING INC.

5.00(
6
)
Approved Pro

SEAMUS BROWNE PLUMBING INC.

5.00(
6
)
Approved Pro
2 years of experience

Welcome to SEAMUS BROWNE PLUMBING INC.! We take pride in the quality of work and customer satisfaction that we give each and every customer! We are known to pay exquisite attention to detail while making customer satisfaction our top priority. Call us today to learn more about how we can help you!

"I had an emergency leak in the house late at night and Seamus was helping me via phone to deal with it. He sent Jesse the next day to fix the problem. Jesse was very efficient, friendly and courteous. The overall experience was great! I would hire them again in a heartbeat"

Andrea A on November 2025

Welcome to SEAMUS BROWNE PLUMBING INC.! We take pride in the quality of work and customer satisfaction that we give each and every customer! We are known to pay exquisite attention to detail while making customer satisfaction our top priority. Call us today to learn more about how we can help you!

"I had an emergency leak in the house late at night and Seamus was helping me via phone to deal with it. He sent Jesse the next day to fix the problem. Jesse was very efficient, friendly and courteous. The overall experience was great! I would hire them again in a heartbeat"

Andrea A on November 2025


Avatar for Rodenhiser Home Services

Rodenhiser Home Services

4.58(
457
)
Approved Pro

Rodenhiser Home Services

4.58(
457
)
Approved Pro
Customers say: Super punctual
94 local quotes requested
98 years of experience

When it comes to great service for your home or business, it doesn't get better than the professionalism and dedication of Rodenhiser. It's an unsurpassed level of service built on a promise that ensures you get the very best - when you call Rodenhiser your satisfaction is guaranteed. With 90+ years of delighted residential and commercial clients, you can be sure that it's a promise that Rodenhiser delivers on every day.

"The work was done correctly and promptly, but quite expensive. On the plus side, he presented all the options and didn't really try to upsell. Just the facts."

stephen m on August 2024

When it comes to great service for your home or business, it doesn't get better than the professionalism and dedication of Rodenhiser. It's an unsurpassed level of service built on a promise that ensures you get the very best - when you call Rodenhiser your satisfaction is guaranteed. With 90+ years of delighted residential and commercial clients, you can be sure that it's a promise that Rodenhiser delivers on every day.

"The work was done correctly and promptly, but quite expensive. On the plus side, he presented all the options and didn't really try to upsell. Just the facts."

stephen m on August 2024


Avatar for RJ Laperle Plumbing & Heating

RJ Laperle Plumbing & Heating

5.00(
1
)
Approved Pro

RJ Laperle Plumbing & Heating

5.00(
1
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
26 years of experience

We take great pride in our experience, expertise, quality, and customer service that we provide. It is our mission to provide excellent workmanship, and complete customer satisfaction from start to completion of a project. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

"Amazing experience all around. Easy to schedule and to work with, good deal and amazing work installing a tankless water heater. I will definitely call for any future needs."

Danielle B on April 2018

We take great pride in our experience, expertise, quality, and customer service that we provide. It is our mission to provide excellent workmanship, and complete customer satisfaction from start to completion of a project. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

"Amazing experience all around. Easy to schedule and to work with, good deal and amazing work installing a tankless water heater. I will definitely call for any future needs."

Danielle B on April 2018


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
370 local quotes requested
18 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 Gervais Plumbing & Heating Inc

Gervais Plumbing & Heating Inc

3.67(
6
)
Approved Pro

Gervais Plumbing & Heating Inc

3.67(
6
)
Approved Pro
Customers say: Quick response
51 local quotes requested

18 Years in Business Gervais Mechanical Service LLC is a fully licensed, local, family-run business. With more than 100 years of combined experience, we strive to bring our customers exceptional repair and installation services they can rely on. We offer turnkey solutions for both residential and commercial customers — no job is too large or complex for our expert team.

"Absolute ripoff, along with shady business practices. They were prompt and courteous, but that's about it. The technician came and had to replace a $200 part on my boiler, it took him under an hour to do the work. A simple Google search showed at least 10 places to buy the exact part, all around $200. No other parts were needed for this repair, I researched what is involved. I was charged almost $1000, including their $89 diagnostic fee just to walk in the door. So apparently it's a $600+/hour labor rate? I'm obviously in the wrong line of work. This was not an off hours emergency call either, it was a scheduled appointment in the middle of a weekday. The shadiest part of the entire thing was that on the invoice (that they email you later) they bury all the cost, it's not itemized i.e. labor vs parts cost. It just says replaced (part) = $1000. A super scummy and shady way to run a "professional" business, taking advantage of people who don't know any better. I wouldn't be surprised if they also sell used cars. Never again Gervais. You've all been warned."

Jeffrey J on January 2025

18 Years in Business Gervais Mechanical Service LLC is a fully licensed, local, family-run business. With more than 100 years of combined experience, we strive to bring our customers exceptional repair and installation services they can rely on. We offer turnkey solutions for both residential and commercial customers — no job is too large or complex for our expert team.

"Absolute ripoff, along with shady business practices. They were prompt and courteous, but that's about it. The technician came and had to replace a $200 part on my boiler, it took him under an hour to do the work. A simple Google search showed at least 10 places to buy the exact part, all around $200. No other parts were needed for this repair, I researched what is involved. I was charged almost $1000, including their $89 diagnostic fee just to walk in the door. So apparently it's a $600+/hour labor rate? I'm obviously in the wrong line of work. This was not an off hours emergency call either, it was a scheduled appointment in the middle of a weekday. The shadiest part of the entire thing was that on the invoice (that they email you later) they bury all the cost, it's not itemized i.e. labor vs parts cost. It just says replaced (part) = $1000. A super scummy and shady way to run a "professional" business, taking advantage of people who don't know any better. I wouldn't be surprised if they also sell used cars. Never again Gervais. You've all been warned."

Jeffrey J on January 2025


Avatar for Petro Home Services

Petro Home Services

4.12(
146
)

Petro Home Services

4.12(
146
)
Customers say: Super punctual
123 years of experience

We're America’s #1 local home heating oil and total home comfort services provider (heating, cooling, plumbing, & chimney). With over 100 years experience, we know how to keep you comfortable, safe and help you save on energy costs. Our local 24/7 customer service and support means automatic heating oil deliveries and our service response is always fast. We never run out of heating oil plus our pricing and payment plans are designed to help you manage your costs all year round. Experience the Petro difference today!

"Atlas Glen-mor I’ll give you the quick facts on Atlas Glen-mor if you have time please read the full history below. Facts • I used to pay a premium price for auto-refills. Despite this, Atlas Glen-mor let my tank run out of oil during the coldest week we have had in New England for years. • I was put on hold for 45 minutes each time I called Atlas Glen-mor (I had to call at least 8 times in the span of 24 hours). • Atlas Glen-mor didn’t care that I have two kids (ages 5 and 8) and that we had to leave our home because temperatures reached 31 F inside the house. • Atlas Glen-mor will not give you a time estimate when they will come to your house. Furthermore, they do not call the second phone number on file, if you don’t answer their first and only call to let you know they are coming to your house. • Our basement pipes froze and a pipe in my living room broke, due to my house not having heat for days during the coldest week in New England. I had to pay close to $1,000 for a plumber to come at 11pm Saturday night to fix my broken pipes. There is damage in my living room floor, basement ceiling and wall. All due to the fact that Atlas Glen-mor left me with no oil and “couldn’t” get me service on the same day. • Atlas Glen-mor never came to prime my system, I had to pay $200 for “emergency service” to another oil company that sent someone 2 hours after I called for help, while Atlas Glen-mor, my oil company for the past 8 years, didn’t send someone for over 48 hours. • Bottom line: as a result of Atlas Glen-mor’s incompetence and negligence, my kids and I had to leave our home for 4 full days and I had to spend thousands of dollars simply because Atlas Glen-mor let my tank run out of oil. Atlas Glen-mor has the worst customer service I have ever experienced. The Full Story On Tuesday January 02, 2018 I ran out of oil. After 45 minutes on hold waiting to speak to my oil company, Atlas Glen-mor, I was informed the earliest I could get service was Friday (2 days later). When I told them that I ran out of oil they, told me I was already in the schedule to get a refill on Wednesday. I want to emphasize: they agreed to an oil refill only because I was already on their schedule, not because they let my tank run out of oil or because I have two kids (5 and 8) and it was the coldest week in New England. Finally, Wednesday afternoon, a driver comes and fills up my tank, but to my surprise he doesn’t know how to prime it so now I had oil but still no heat. After another 45 minutes on hold, I was told the earliest they could come was Friday, even though I told them my kids and myself had to leave my house since temperatures had dropped too low to stay (31 F inside the house). I asked if they could give me a time frame on Friday, so I could make sure to be there, their answer was “NO, we will call you.” Then I asked: can you let me know 20 minutes before coming so I can make sure I get there? Their answer was “we will call you before going to your home” period. So, Wednesday night the kids and I had to leave our home, Friday morning comes and I get a message from my husband saying he has a missed call on his cell phone. Sure enough, it was the oil company—they didn’t call me, they called my husband. I rushed home only to have missed them by 10 minutes (according to my neighbor) so I called again and after 45 minutes on hold the lady tells me I missed the service visit and that now I had to wait until Monday to get someone to my house to prime. At this point I was crying on the phone, asking her why they called my husband’s cell phone and not mine, and if they didn’t get an answer why didn’t they call my cell phone if both numbers are on file. She replied “we don’t have time to call another number.” I started calling other oil companies around my area, to my surprise they all answered the phone on the spot—no waiting times. One company tells me they have an emergency service and they could come prime it that same afternoon and they would call me 20 – 25 minutes before coming so I would have enough time to get there. I am not their customer and they treated me 100% better than my oil company for the last 8 years. I had to pay them $200 for a service that’s included with my oil company, but at least I got my heat again Friday night. The house was so cold (31 F inside) that we couldn’t stay, we had to sleep out of our home another night. We came back Saturday afternoon to find that the pipes in my basement had frozen and a pipe in my living room broke. Now we have water in our living room, the basement ceiling broke and we have water in our finished basement too. We had to call a plumber that stayed with us until 2am Sunday, helping us repair and unfreeze our pipes. I had to pay him close to $1,000 and I still don’t know how much is the cost for all the damage to my basement ceiling and walls. In summary, during one of the coldest storms in NE history, every company apart from Atlas Glen-mor was trying to help people that were not even their loyal customers, while my company for the last 8 years treated me as an afterthought, and in the process caused thousands of dollars in damage to my house. THANK YOU Atlas Glen-mor for the worst customer service I have ever experienced."

Giusi I on January 2018

We're America’s #1 local home heating oil and total home comfort services provider (heating, cooling, plumbing, & chimney). With over 100 years experience, we know how to keep you comfortable, safe and help you save on energy costs. Our local 24/7 customer service and support means automatic heating oil deliveries and our service response is always fast. We never run out of heating oil plus our pricing and payment plans are designed to help you manage your costs all year round. Experience the Petro difference today!

"Atlas Glen-mor I’ll give you the quick facts on Atlas Glen-mor if you have time please read the full history below. Facts • I used to pay a premium price for auto-refills. Despite this, Atlas Glen-mor let my tank run out of oil during the coldest week we have had in New England for years. • I was put on hold for 45 minutes each time I called Atlas Glen-mor (I had to call at least 8 times in the span of 24 hours). • Atlas Glen-mor didn’t care that I have two kids (ages 5 and 8) and that we had to leave our home because temperatures reached 31 F inside the house. • Atlas Glen-mor will not give you a time estimate when they will come to your house. Furthermore, they do not call the second phone number on file, if you don’t answer their first and only call to let you know they are coming to your house. • Our basement pipes froze and a pipe in my living room broke, due to my house not having heat for days during the coldest week in New England. I had to pay close to $1,000 for a plumber to come at 11pm Saturday night to fix my broken pipes. There is damage in my living room floor, basement ceiling and wall. All due to the fact that Atlas Glen-mor left me with no oil and “couldn’t” get me service on the same day. • Atlas Glen-mor never came to prime my system, I had to pay $200 for “emergency service” to another oil company that sent someone 2 hours after I called for help, while Atlas Glen-mor, my oil company for the past 8 years, didn’t send someone for over 48 hours. • Bottom line: as a result of Atlas Glen-mor’s incompetence and negligence, my kids and I had to leave our home for 4 full days and I had to spend thousands of dollars simply because Atlas Glen-mor let my tank run out of oil. Atlas Glen-mor has the worst customer service I have ever experienced. The Full Story On Tuesday January 02, 2018 I ran out of oil. After 45 minutes on hold waiting to speak to my oil company, Atlas Glen-mor, I was informed the earliest I could get service was Friday (2 days later). When I told them that I ran out of oil they, told me I was already in the schedule to get a refill on Wednesday. I want to emphasize: they agreed to an oil refill only because I was already on their schedule, not because they let my tank run out of oil or because I have two kids (5 and 8) and it was the coldest week in New England. Finally, Wednesday afternoon, a driver comes and fills up my tank, but to my surprise he doesn’t know how to prime it so now I had oil but still no heat. After another 45 minutes on hold, I was told the earliest they could come was Friday, even though I told them my kids and myself had to leave my house since temperatures had dropped too low to stay (31 F inside the house). I asked if they could give me a time frame on Friday, so I could make sure to be there, their answer was “NO, we will call you.” Then I asked: can you let me know 20 minutes before coming so I can make sure I get there? Their answer was “we will call you before going to your home” period. So, Wednesday night the kids and I had to leave our home, Friday morning comes and I get a message from my husband saying he has a missed call on his cell phone. Sure enough, it was the oil company—they didn’t call me, they called my husband. I rushed home only to have missed them by 10 minutes (according to my neighbor) so I called again and after 45 minutes on hold the lady tells me I missed the service visit and that now I had to wait until Monday to get someone to my house to prime. At this point I was crying on the phone, asking her why they called my husband’s cell phone and not mine, and if they didn’t get an answer why didn’t they call my cell phone if both numbers are on file. She replied “we don’t have time to call another number.” I started calling other oil companies around my area, to my surprise they all answered the phone on the spot—no waiting times. One company tells me they have an emergency service and they could come prime it that same afternoon and they would call me 20 – 25 minutes before coming so I would have enough time to get there. I am not their customer and they treated me 100% better than my oil company for the last 8 years. I had to pay them $200 for a service that’s included with my oil company, but at least I got my heat again Friday night. The house was so cold (31 F inside) that we couldn’t stay, we had to sleep out of our home another night. We came back Saturday afternoon to find that the pipes in my basement had frozen and a pipe in my living room broke. Now we have water in our living room, the basement ceiling broke and we have water in our finished basement too. We had to call a plumber that stayed with us until 2am Sunday, helping us repair and unfreeze our pipes. I had to pay him close to $1,000 and I still don’t know how much is the cost for all the damage to my basement ceiling and walls. In summary, during one of the coldest storms in NE history, every company apart from Atlas Glen-mor was trying to help people that were not even their loyal customers, while my company for the last 8 years treated me as an afterthought, and in the process caused thousands of dollars in damage to my house. THANK YOU Atlas Glen-mor for the worst customer service I have ever experienced."

Giusi I on January 2018

...
Showing 1-10 of 1014

The Leominster, 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.