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Tankless water heater repair pros in Selden

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.


Avatar for 1-800-Plumber +Air of Central Long Island
1-800-Plumber +Air of Central Long Island
36 Gazza Boulevard
5.00(
6
)
Approved Pro
1-800-Plumber +Air of Central Long Island
36 Gazza Boulevard
5.00(
6
)
Approved Pro
Customers say: Quick response
186 local quotes requested
1 years of experience

1-800-Plumber + Air of Central Long Island is focused on being the BEST! It's not about being better than everyone else, instead our focus is on providing you with the fast, dependable plumbing and emergency services when you need it most. Our goal is to give you the BEST experience you have ever received from a service based business.

"Greg fixed dryer vent clog, bathroom sink leak, and outdoor hose spigot drip to perfection! Greg was very professional, used shoe covers, took care not to damage any property, and left everything spotless. As the homeowner, the service was outstanding and the price reasonable. Catherine Martin"

Catherine M on April 2025

1-800-Plumber + Air of Central Long Island is focused on being the BEST! It's not about being better than everyone else, instead our focus is on providing you with the fast, dependable plumbing and emergency services when you need it most. Our goal is to give you the BEST experience you have ever received from a service based business.

"Greg fixed dryer vent clog, bathroom sink leak, and outdoor hose spigot drip to perfection! Greg was very professional, used shoe covers, took care not to damage any property, and left everything spotless. As the homeowner, the service was outstanding and the price reasonable. Catherine Martin"

Catherine M on April 2025


Avatar for Tedco Group, Inc.
Tedco Group, Inc.
140 North 9th Street
4.54(
323
)
Approved Pro
Tedco Group, Inc.
140 North 9th Street
4.54(
323
)
Approved Pro
Customers say: Quality work
Recommended by 92% of Angi customers
Recommended by 92% of HomeAdvisor customers
15 years of experience

We are dedicated to providing our clients with the very best in service, installation, and repair for your heating and cooling needs. We are a locally owned and operated company that values honesty and integrity. We specialize in central A/C and cooling systems as well as heating and furnace systems. We take pride in the quality of our work and our commitment to outstanding results and look forward to building long-term relationships with our clients, and guarantee your satisfaction.

"Fantastic service. Job was completed quickly, and staff was clean."

Panagiotis S on May 2025

We are dedicated to providing our clients with the very best in service, installation, and repair for your heating and cooling needs. We are a locally owned and operated company that values honesty and integrity. We specialize in central A/C and cooling systems as well as heating and furnace systems. We take pride in the quality of our work and our commitment to outstanding results and look forward to building long-term relationships with our clients, and guarantee your satisfaction.

"Fantastic service. Job was completed quickly, and staff was clean."

Panagiotis S on May 2025


Avatar for Varsity Home Service Company, Inc.
Varsity Home Service Company, Inc.
1610 Ocean Avenue
4.78(
186
)
Approved Pro
Varsity Home Service Company, Inc.
1610 Ocean Avenue
4.78(
186
)
Approved Pro
Customers say: Quality work
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers
431 local quotes requested

Practice makes perfect, and Varsity has been at it for over half a century! What began with a Navy veteran’s simple dream — to teach the value of honest, hands-on work to his children — has grown into one of Long Island’s most trusted resource for plumbing, heating and air conditioning services. Varsity’s mission has always been clear: to serve our neighbors with integrity, solve home service challenges with innovative solutions, and provide lasting results. Our dedicated crew is background-checked, rigorously trained in the latest technology, and excited to exceed your expectations. Above all Varsity is here to EARN your trust—not just for today, but for years to come. Let’s tackle your home service needs with the quality and care you deserve!

"Prompt and professional. Thanks."

Justin S on May 2025

Practice makes perfect, and Varsity has been at it for over half a century! What began with a Navy veteran’s simple dream — to teach the value of honest, hands-on work to his children — has grown into one of Long Island’s most trusted resource for plumbing, heating and air conditioning services. Varsity’s mission has always been clear: to serve our neighbors with integrity, solve home service challenges with innovative solutions, and provide lasting results. Our dedicated crew is background-checked, rigorously trained in the latest technology, and excited to exceed your expectations. Above all Varsity is here to EARN your trust—not just for today, but for years to come. Let’s tackle your home service needs with the quality and care you deserve!

"Prompt and professional. Thanks."

Justin S on May 2025


Avatar for 1-800-Plumber + Air of Babylon
1-800-Plumber + Air of Babylon
36 Gazza Boulevard
5.00(
10
)
Approved Pro
1-800-Plumber + Air of Babylon
36 Gazza Boulevard
5.00(
10
)
Approved Pro
Customers say: Quick response
55 local quotes requested
1 years of experience

1-800-Plumber + Air of Babylon is focused on being the BEST! It's not about being better than everyone else, instead our focus is on providing you with the fast, dependable plumbing and emergency services when you need it most. Our goal is to give you the BEST experience you have ever received from a service based business.

"Had 1800 plumber come out to fix a leaking valve in my basement. Super convenient and friendly! 10/10"

Mike M on April 2025

1-800-Plumber + Air of Babylon is focused on being the BEST! It's not about being better than everyone else, instead our focus is on providing you with the fast, dependable plumbing and emergency services when you need it most. Our goal is to give you the BEST experience you have ever received from a service based business.

"Had 1800 plumber come out to fix a leaking valve in my basement. Super convenient and friendly! 10/10"

Mike M on April 2025


Avatar for BuildRite Pro Inc.
BuildRite Pro Inc.
Suffolk County
4.11(
19
)
Approved Pro
BuildRite Pro Inc.
Suffolk County
4.11(
19
)
Approved Pro
1474 local quotes requested
Free onsite estimate

Here at Bawa Construction Group, we sustain our business on quality and integrity. We are experts in general contracting specializing in all types of remodeling, Concrete work, Hardscaping/Pavers, Kitchen/Bath/ and Basements. We are committed to providing quality services from the beginning to the end of your project or scope of work. We look forward to earning your business. We also offer financing options to all customers dealing with 30+ banks and lenders. Book your FREE ESTIMATE today!!!

"Didn’t make good on a project gone bed."

Gale M on February 2024

Here at Bawa Construction Group, we sustain our business on quality and integrity. We are experts in general contracting specializing in all types of remodeling, Concrete work, Hardscaping/Pavers, Kitchen/Bath/ and Basements. We are committed to providing quality services from the beginning to the end of your project or scope of work. We look forward to earning your business. We also offer financing options to all customers dealing with 30+ banks and lenders. Book your FREE ESTIMATE today!!!

"Didn’t make good on a project gone bed."

Gale M on February 2024


Avatar for Classic Remodeling Group Inc
Classic Remodeling Group Inc
1839 Bellmore Ave
4.79(
43
)
Approved Pro
Classic Remodeling Group Inc
1839 Bellmore Ave
4.79(
43
)
Approved Pro
Super Service Award
Customers say: Super punctual
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers
2414 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 crew did a fabulous job renovating my bathroom. It was done in a timely manner and they were extremely neat and cleaned up very well after themselves. I would definitely hire them again!"

Denise S on March 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 crew did a fabulous job renovating my bathroom. It was done in a timely manner and they were extremely neat and cleaned up very well after themselves. I would definitely hire them again!"

Denise S 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
188 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


Avatar for JNM Sewer
JNM Sewer
36 1st Ave
5.00(
28
)
Approved Pro
JNM Sewer
36 1st Ave
5.00(
28
)
Approved Pro
Super Service Award
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
122 local quotes requested

Here at JNM Sewer & Drain we know how difficult it can be to experience plumbing problems. We’re a family owned and operated company that wants to take on your challenges efficiently, quickly, and at the lowest cost possible. We won’t tell you we can’t help you over the phone. Instead we’ll discuss, provide estimated costs over the phone, and if we need more information, you can even send a text message with a photo of your issue. We don’t pretend to specialize in various industries. Instead we focus on one thing and do it well: sewer and drain cleaning. We offer solutions for homeowners, plumbers, and small business owners. WHY ELSE SHOULD YOU CONSIDER US? We offer warranties. We’ve got the equipment on-hand to tackle your challenges. We offer maintenance programs (monthly or yearly options available). We’re great communicators so we make sure you understand the issue and how we’re going to solve it before we take it on. We charge on a job basis, not hourly. No hidden fees. AREAS WE SERVE We cater to homes and businesses located in Nassau County, Suffolk County, Queens, Brooklyn, and the Bronx.

"Job was done very well. Fairly priced and conscientious and respectful. I would definitely use him again."

Al S on May 2025

Here at JNM Sewer & Drain we know how difficult it can be to experience plumbing problems. We’re a family owned and operated company that wants to take on your challenges efficiently, quickly, and at the lowest cost possible. We won’t tell you we can’t help you over the phone. Instead we’ll discuss, provide estimated costs over the phone, and if we need more information, you can even send a text message with a photo of your issue. We don’t pretend to specialize in various industries. Instead we focus on one thing and do it well: sewer and drain cleaning. We offer solutions for homeowners, plumbers, and small business owners. WHY ELSE SHOULD YOU CONSIDER US? We offer warranties. We’ve got the equipment on-hand to tackle your challenges. We offer maintenance programs (monthly or yearly options available). We’re great communicators so we make sure you understand the issue and how we’re going to solve it before we take it on. We charge on a job basis, not hourly. No hidden fees. AREAS WE SERVE We cater to homes and businesses located in Nassau County, Suffolk County, Queens, Brooklyn, and the Bronx.

"Job was done very well. Fairly priced and conscientious and respectful. I would definitely use him again."

Al S on May 2025

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Tankless water heater installations FAQs

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.

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