Top-rated tankless water heater repair pros.

Get matched with top tankless water heater repair pros in your area

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.

Tankless water heater repair pros in Stony Brook

Avatar for Mr. Big Plumbing & Heating
Mr. Big Plumbing & Heating
38 Brefni Street
4.88(
13
)
Approved Pro
Mr. Big Plumbing & Heating
38 Brefni Street
4.88(
13
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
3 years of experience

Big Plumbing and Heating, Inc., is your local contractor with over 20 years experience in taking care of all your needs. We do installs and service work for Suffolk and Nassau Counties. Call Today!

"Andre is very knowledgeable about the job. He not only fix the problem but also advise the necessary preventative action."

Victor P on April 2024

Big Plumbing and Heating, Inc., is your local contractor with over 20 years experience in taking care of all your needs. We do installs and service work for Suffolk and Nassau Counties. Call Today!

"Andre is very knowledgeable about the job. He not only fix the problem but also advise the necessary preventative action."

Victor P on April 2024


Avatar for Energywise, Inc.
Energywise, Inc.
2231 5th Avenue
New on HomeAdvisorNew on Angi
Approved Pro
Energywise, Inc.
2231 5th Avenue
New on AngiNew on HomeAdvisor
Approved Pro
40 years of experience
Emergency services offered

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumers 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.

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumers 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.


Tri Seasonal Plumbing, Inc.
266 Middle Island Rd, Unit 13
5.00(
1
)
Approved Pro
Tri Seasonal Plumbing, Inc.
266 Middle Island Rd, Unit 13
5.00(
1
)
Approved Pro
14 local quotes requested
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 the start to the 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.

"I had Tommy come by to fix a boiler pipe for one of my customers. Great pricing and hard working. Will continue to use them for future projects :)"

Stephan C on April 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 the start to the 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.

"I had Tommy come by to fix a boiler pipe for one of my customers. Great pricing and hard working. Will continue to use them for future projects :)"

Stephan C on April 2025


Avatar for Drain Away Sewer Service Inc
Drain Away Sewer Service Inc
P.O. Box 3065
4.82(
38
)
Approved Pro
Drain Away Sewer Service Inc
P.O. Box 3065
4.82(
38
)
Approved Pro
Customers say: Quick response
Recommended by 94% of Angi customers
Recommended by 94% of HomeAdvisor customers
16 local quotes requested

At Drain Away Sewer Service, Inc., we put our customers needs first! We offer a range of drain services and we know that our customer's are the backbone of our success. Response times are quick through our 24-hour emergency service and we pride ourselves on providing competitive, up-front costs. Whether you take advantage of our maintenance and service contracts for savings, or you use us for one-time emergency services, Drain Away Sewer Service, Inc. will deliver on professional, reliable and quality work. Drain Away Sewer Service, Inc. provides both residential and commercial drain cleaning services 24 hours a day, 7 days a week and 365 days per year. Offering over 10 years of experience in the drain cleaning business, our qualified staff is prepared to handle everything from a clogged toilet to main sewer services. We are centrally located to service both Westchester and Fairfield Counties.

"Richard from Drain Away service came out the next day and fixed the clogged drain. He was also very helpful with getting Servpro out to do clean up. Richard provided full and efficient services. Very pleasant and reasonably priced. I would definitely recommend Drain Away for any plumbing issues and would use them again if needed."

Paula A on February 2025

At Drain Away Sewer Service, Inc., we put our customers needs first! We offer a range of drain services and we know that our customer's are the backbone of our success. Response times are quick through our 24-hour emergency service and we pride ourselves on providing competitive, up-front costs. Whether you take advantage of our maintenance and service contracts for savings, or you use us for one-time emergency services, Drain Away Sewer Service, Inc. will deliver on professional, reliable and quality work. Drain Away Sewer Service, Inc. provides both residential and commercial drain cleaning services 24 hours a day, 7 days a week and 365 days per year. Offering over 10 years of experience in the drain cleaning business, our qualified staff is prepared to handle everything from a clogged toilet to main sewer services. We are centrally located to service both Westchester and Fairfield Counties.

"Richard from Drain Away service came out the next day and fixed the clogged drain. He was also very helpful with getting Servpro out to do clean up. Richard provided full and efficient services. Very pleasant and reasonably priced. I would definitely recommend Drain Away for any plumbing issues and would use them again if needed."

Paula A on February 2025


Bathroom Guru
77-20 Windsor Place
5.00(
5
)
Approved Pro
Bathroom Guru
77-20 Windsor Place
5.00(
5
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
548 local quotes requested

We specialize in all phases of bathroom remodels and more! We guarantee your satisfaction, and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Check out all the services we offer below and call -or- click to schedule a free estimate today!

"These guys are great. New bathroom. Came out perfect no issues. I'd highly recommend for any work being done."

Kevin O on September 2023

We specialize in all phases of bathroom remodels and more! We guarantee your satisfaction, and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Check out all the services we offer below and call -or- click to schedule a free estimate today!

"These guys are great. New bathroom. Came out perfect no issues. I'd highly recommend for any work being done."

Kevin O on September 2023


Avatar for JBL HOME IMPROVEMENTS INC
JBL HOME IMPROVEMENTS INC
PO BOX 584
4.67(
255
)
Approved Pro
JBL HOME IMPROVEMENTS INC
PO BOX 584
4.67(
255
)
Approved Pro
Customers say: Quality work
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers
2105 local quotes requested

JBL Home Improvements, Inc, located in St. James, is a family owned and operated remodeling business specializing in residential projects. Owner & Contractor David Kaplan, General Manager Jill Kaplan, along with their team of talented professionals, are dedicated to providing outstanding workmanship and customer service to homeowners who live in their community.

"JBL Home Improvements is a great company to work with. Dave and Jill are friendly, helpful, reliable and punctual! When they stay they will start, the do. They are there early each day and keep things as tidy as possible. For our recent job they finished just 1 day past the expected time-frame. Considering the many stories you probably have heard - the timing was spot on! They have great resources and talented workers who did an excellent job installing new floors and a new set of stairs, as well as new doors, sheet rock and molding! Highly recommend using JBL Home Improvements!"

Jeff G on March 2025

JBL Home Improvements, Inc, located in St. James, is a family owned and operated remodeling business specializing in residential projects. Owner & Contractor David Kaplan, General Manager Jill Kaplan, along with their team of talented professionals, are dedicated to providing outstanding workmanship and customer service to homeowners who live in their community.

"JBL Home Improvements is a great company to work with. Dave and Jill are friendly, helpful, reliable and punctual! When they stay they will start, the do. They are there early each day and keep things as tidy as possible. For our recent job they finished just 1 day past the expected time-frame. Considering the many stories you probably have heard - the timing was spot on! They have great resources and talented workers who did an excellent job installing new floors and a new set of stairs, as well as new doors, sheet rock and molding! Highly recommend using JBL Home Improvements!"

Jeff G on March 2025


Avatar for Classic Remodeling Group Inc
Classic Remodeling Group Inc
1839 Bellmore Ave
4.80(
44
)
Approved Pro
Classic Remodeling Group Inc
1839 Bellmore Ave
4.80(
44
)
Approved Pro
Customers say: Super punctual
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers
2375 local quotes requested

Full service remodeling, roofing and siding contractors serving Long Island. Whether you are in need of new roof installation, roof restoration, or roof repairs; new siding installation, siding repairs; new windows & doors installation; kitchen remodeling; bathroom remodeling; we are the Long Island home remodeling contractors to call, due to our professionalism and affordability.

"John and his team did an excellent job tiling my bathroom. I am very detail oriented and was extremely happy with the precision and quality of his work. I would certainly hire him again and strongly recommend him."

Allan S on June 2025

Full service remodeling, roofing and siding contractors serving Long Island. Whether you are in need of new roof installation, roof restoration, or roof repairs; new siding installation, siding repairs; new windows & doors installation; kitchen remodeling; bathroom remodeling; we are the Long Island home remodeling contractors to call, due to our professionalism and affordability.

"John and his team did an excellent job tiling my bathroom. I am very detail oriented and was extremely happy with the precision and quality of his work. I would certainly hire him again and strongly recommend him."

Allan S on June 2025


Avatar for AR Home Construction
AR Home Construction
25 Berry Hill Rd
5.00(
29
)
Approved Pro
AR Home Construction
25 Berry Hill Rd
5.00(
29
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
661 local quotes requested

A.R. Home Construction is a premier design and build construction company specializing in luxury new home construction and high-end remodeling projects. With expertise in all aspects of construction, from conceptual design to final touches, A.R. Home Construction delivers exquisite and luxurious transformations. Our team of skilled professionals is dedicated to exceeding client expectations and creating stunning spaces that reflect unparalleled craftsmanship. Explore luxury and sophistication at our home design showroom, offering a curated selection of top -quality products for your project.

"Completed beyond on expectations. Total Transformation. One comment by our neighbors - You have raised the bar for the community."

Christy V on October 2024

A.R. Home Construction is a premier design and build construction company specializing in luxury new home construction and high-end remodeling projects. With expertise in all aspects of construction, from conceptual design to final touches, A.R. Home Construction delivers exquisite and luxurious transformations. Our team of skilled professionals is dedicated to exceeding client expectations and creating stunning spaces that reflect unparalleled craftsmanship. Explore luxury and sophistication at our home design showroom, offering a curated selection of top -quality products for your project.

"Completed beyond on expectations. Total Transformation. One comment by our neighbors - You have raised the bar for the community."

Christy V on October 2024


Avatar for Islandwide Contracting
Islandwide Contracting
23 Union Avenue
5.00(
1
)
Approved Pro
Islandwide Contracting
23 Union Avenue
5.00(
1
)
Approved Pro
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
521 local quotes requested

​At Islandwide Contracting LLC, we have been proudly serving Suffolk County and surrounding areas since 2019, bringing over 30 years of combined experience to every project. Our comprehensive range of residential and commercial construction services includes interior and exterior work, such as medical offices, restaurants, urgent care facilities, dormers, and extensions. We specialize in bathroom and kitchen renovations, as well as basement transformations. Contact us today for a free estimate at 631-779-9277, and let us help you build the dream you envision. ​**At Islandwide Contracting, we deeply appreciate the dedication and sacrifices of our military personnel, first responders, and senior citizens. As a token of our gratitude, we are proud to offer special discounts tailored specifically for these esteemed groups. Please inquire about these exclusive offers when you contact us, and let us assist you in bringing your vision to life.**

"Islandwide Contracting did an amazing job for our new medical facility in Holbrook. We have gotten tons of compliments for their high quality work. Definitely would rehire them again! Thank you to Andrew and his team."

Sayed K on March 2025

​At Islandwide Contracting LLC, we have been proudly serving Suffolk County and surrounding areas since 2019, bringing over 30 years of combined experience to every project. Our comprehensive range of residential and commercial construction services includes interior and exterior work, such as medical offices, restaurants, urgent care facilities, dormers, and extensions. We specialize in bathroom and kitchen renovations, as well as basement transformations. Contact us today for a free estimate at 631-779-9277, and let us help you build the dream you envision. ​**At Islandwide Contracting, we deeply appreciate the dedication and sacrifices of our military personnel, first responders, and senior citizens. As a token of our gratitude, we are proud to offer special discounts tailored specifically for these esteemed groups. Please inquire about these exclusive offers when you contact us, and let us assist you in bringing your vision to life.**

"Islandwide Contracting did an amazing job for our new medical facility in Holbrook. We have gotten tons of compliments for their high quality work. Definitely would rehire them again! Thank you to Andrew and his team."

Sayed K on March 2025


Avatar for Quest Home and Office Renovations
Quest Home and Office Renovations
2 Kay St.
5.00(
9
)
Approved Pro
Quest Home and Office Renovations
2 Kay St.
5.00(
9
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
193 local quotes requested

Quest has been serving the Long Island Area in remodeling homes for over 30 years. We specialize in residential work and deal directly with the homeowners for a more personal and comfortable experience. We know the place you live is an important part of your life and take great care in making sure that the job is completed to your satisfaction. The owner of the company is present and working at every job providing full attention to your project. We make sure that you not only receive the best service possible, but we make sure we leave your home... SPOTLESS! Call us today to get a FREE quote!

"I think the quality was extremely satisfactory if there's anything that we found that we were not happy with, they are very responsive and will rectify everything to our satisfaction. Mike as the primary contractor they used other contractors for select basis of the construction like demolition, electrical, plumbing and sheetrock spackle, we're satisfied with all of them as well, they were very professional and accommodating. Mike used consumers kitchen and bath as the supplier of the kitchen cabinets and countertops for which we are also satisfied, The overall finished product has resulted a modern update of our kitchen in which we are extremely proud of and we would definitely recommend Quest Home and Office Renovation for a remodel of another consumers kitchen."

Joseoh T on April 2023

Quest has been serving the Long Island Area in remodeling homes for over 30 years. We specialize in residential work and deal directly with the homeowners for a more personal and comfortable experience. We know the place you live is an important part of your life and take great care in making sure that the job is completed to your satisfaction. The owner of the company is present and working at every job providing full attention to your project. We make sure that you not only receive the best service possible, but we make sure we leave your home... SPOTLESS! Call us today to get a FREE quote!

"I think the quality was extremely satisfactory if there's anything that we found that we were not happy with, they are very responsive and will rectify everything to our satisfaction. Mike as the primary contractor they used other contractors for select basis of the construction like demolition, electrical, plumbing and sheetrock spackle, we're satisfied with all of them as well, they were very professional and accommodating. Mike used consumers kitchen and bath as the supplier of the kitchen cabinets and countertops for which we are also satisfied, The overall finished product has resulted a modern update of our kitchen in which we are extremely proud of and we would definitely recommend Quest Home and Office Renovation for a remodel of another consumers kitchen."

Joseoh T on April 2023

...
Showing 1-10 of 938

FAQs for tankless water heater installation projects in Stony Brook, NY

Professional flushing services for tankless water heaters run about $200 per visit. This essential maintenance procedure eliminates mineral deposits from critical components, particularly the heat exchanger. While homeowners can purchase DIY flushing kits for $50 to $100, professional service offers the advantage of thorough cleaning with proper techniques. Professional maintenance also includes inspection of additional components that might need attention.

Industry experts and manufacturers recommend annual maintenance for tankless water heaters, with more frequent service (every six months) for homes with challenging water conditions. This regular attention prevents efficiency losses and extends the unit's operational lifespan. Watch for warning signs like reduced water temperature, inconsistent performance, or system error codes that might indicate maintenance is needed sooner than scheduled.

Neglecting regular maintenance allows mineral scale to accumulate within your system, restricting water flow and reducing heating efficiency. This forces your unit to work harder, consuming more energy while delivering less satisfactory performance. Over time, this strain can lead to component failures, inconsistent water temperatures, and premature system replacement. Additionally, most manufacturers require documentation of regular maintenance to honor warranty coverage for major components.

Share project details to get started.