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Top-Rated Water heater installers and replacers in Islip - Updated Nov 2026

Avatar for Champion Plumbing & Heating
Champion Plumbing & Heating
4.8(
45
)
Water Heater - Install or Replace

Serving Islip, NY and surrounding areas

Approved

In business since 2000

Emergency services offered

Small jobs welcome

"I used champion plumbing and heating to replace my hot water heater in an emergency. I was completely amazed at how fast they are. Steve and crew where at my house with a new heater in less then two hours. My emergency was fixed a new hot water heater was installed and I had hot water in less then hour and a half after their arrival. My experience was great with Champion they were fast,neat, Clean, knowledgeable and professional. I would highly recommend Steve to everyone . I also have to mention the cost was less then I expected and very reasonable. Thanks again Champion heating and plumbing."
12 neighbors recently requested a quote
Recommended by71%of homeowners
Avatar for Reliable Plumbing & Heating
Reliable Plumbing & Heating
4.9(
14
)
Water Heater - Install or Replace

Serving Islip, NY and surrounding areas

Approved

In business since 2004

Free estimates

Emergency services offered

"Jerry has the plumbing expertise anyone would love to hire . He shows up as expected, in a very timely manner, He works very professionally,, explains the details of his job in a manner that that one can easily understand, very clean & tidy that I did not do any cleaning at all after he completed the job. He is highly skilled in what he was doing which was installing/ replacing my leaking water heater. Above all, he is very kind & respectful with great communication & interpersonal skills."
6 neighbors recently requested a quote
Avatar for All Weather Heating & Cooling
All Weather Heating & Cooling
4.5(
70
)
Water Heater - Install or Replace

Serving Islip, NY and surrounding areas

Approved

In business since 1969

Free estimates

Emergency services offered

"Tom was terrific....repaired boiler....cost reasonable.....explained everything so clearly so that even this 88year old understood it....experience with company from start to finish was a pleasure"
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+13

Response time3 days
7 neighbors recently requested a quote
Recommended by94%of homeowners
Just Rite Heating and Cooling
4.9(
132
)
Water Heater - Install or Replace

Serving Islip, NY and surrounding areas

Approved

In business since 1995

Free estimates

Credit card accepted

"I am not a review writer at all, however, I felt it only fair to write a review for Eric and Just Rite HVAC after a wonderful experience. This company and Eric the owner are, in a word, the BEST! I needed main floorâ s central AC replaced. A friend recommended me to Eric. I texted him and he responded with a few hours. setting up an appointment was fast and easy. Eric was knowledgeable and timely. My job was extremely difficult based on the location of my air handler and there was a high chance the ceiling would need to be opened for access. When Eric arrived for the job he inspected further and said he was going to try not to have to open the ceiling for access. He and his crew went well beyond what anybody else would have done and meticulously dismantled the old air handler piece by piece. It was time consuming, difficult and energy consuming. But they were able to do and saved me from having a gaping hole in my ceiling. They did an excellent job setting up the new air handler in the same location and even fixed errors the previous installer had made! The entire crew were highly professional, courteous and clean. They put down drop cloths everywhere and cleaned up everything when they were done. I highly, highly, and without reservation, recommend Eric and Just Rite HVAC and will tell anybody I know about them."
Response time5 hrs
4 neighbors recently requested a quote
Recommended by97%of homeowners
Avatar for Patience HVAC, LLC
Patience HVAC, LLC
4.9(
30
)
Water Heater - Install or Replace

Serving Islip, NY and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

"I am very happy that I hired Patience HVAC to replace my hot water heater. I have an oil burner and oil hot water heater. The 18 year old heater was making crackling noises and I was advised by the oil company to replace it. I wanted to convert to a gas hot water heater and tried going through Lowes. However, they only do swap outs if the existing heater is already set up for gas. So I contacted several companies for a quote. Out of all of them, Anthony was the most professional, down to earth and reasonably priced. First, he suggested to explore correcting the issue on the old heater and save me money which was impressive. I decided to proceed with a new gas heater. The quote he gave me was $800 less than the next lowest quote. Anthony sent his workers Caesar and Matt the next day which I greatly appreciated. They were both very polite and wore covers on their shoes so to avoid dirtying my house more than necessary. Anthony came later in the day to ensure everything was done correctly. He then offered to call him with any questions even if they were not pertinent to the work they performed. I am extremely impressed with patience HVAC honesty, professionalism and reasonable prices. I will be sure to recommend them to friends and family. When I am ready to install a ductless air conditioner, I will definitely contact Patience HVAC."
Peerless
Peerless Boiler with Hot Water
Annual Service
Response time4 hrs
Recommended by100%of homeowners
Avatar for Varsity Home Service Company, Inc.
Varsity Home Service Company, Inc.
4.4(
244
)
Water Heater - Install or Replace

Serving Islip, NY and surrounding areas

Approved

In business since 1962

Free estimates

Emergency services offered

"Our home central air conditioning system needed to be replaced. After reviewing and getting estimates from several companies, we decided, due to their outstanding reviews, to use Varsity Home Service to replace our entire central air conditioning system. There is no question that we made the right choice to use this company. From the pleasant attitude of the receptionist to the sales people and technical support, they showed concern as to what system would be best for our needs without pressure to upsell items. They came to our house on time and evaluated our house and made recommendations as to what they felt was the appropriate replacement system to satisfy our needs. Everyone we dealt with made our experience a most pleasant one, explained what we needed and helped us make the right decision regarding the system that would be best for us. Their estimate and cost for the system we chose was competitive. After making the decision to use their services, they came on time, the technicians were knowledgeable and efficient in replacing our system, they answered all questions to our satisfaction, explained an reviewed the function of the system, tested out the system, and they removed all debris and the old system from the premises. The following people were outstanding to deal with and helpful in guiding us to use their company and services (Anna Cinquemani, Depree Weeks, Eric, Mario Castro, Matthew Accattato, Ryan Kierych, Ryan Oâ Malley, and Santiago Ocassio as well as several others) everyone that I dealt with in the company was pleasant, concerned, knowledgeable, receptive, and efficient. There is no question that I would recommend to anyone who needed air conditioning services, installation, or replacement that they use Varsity Home Service."
Shower Fixtures
Installation
Truck
Best of L.I. Winner 2024
Angi 2022 Super Service Award Winner

+86

Response time11 hrs
131 neighbors recently requested a quote
Recommended by84%of homeowners
Avatar for AquaFlow Plumbing Heating & Water Systems
AquaFlow Plumbing Heating & Water Systems
5.0(
10
)
Water Heater - Install or Replace

Serving Islip, NY and surrounding areas

Approved

In business since 2020

Free estimates

Small jobs welcome

"Hi, I?m happy with my water system I could say that now I drink clean water and also my family are happy to have a main filtration system in our house. Thank you so much for your help 100% honest and punctual. RECOMMENDED"
Project Photos
Projects done
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Projects done

+5

2 neighbors recently requested a quote
A&M Plumbing & Heating
4.8(
13
)
Water Heater - Install or Replace

Serving Islip, NY and surrounding areas

Approved

In business since 2023

Free estimates

Credit card accepted

We are a locally owned and operated business committed to providing exceptional service, quality workmanship, and honest communication on every project we undertake. Our experienced team takes pride in delivering customized solutions tailored specifically to meet each client's unique needs. We value integrity and reliability, ensuring every job is completed to your satisfaction. Our goal is to build lasting relationships with our customers through consistency, professionalism, and outstanding results. Let us show you why homeowners continually choose us as their trusted service provider.

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