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Top-Rated Tankless water heater installers in Mahwah - Updated Nov 2026

Avatar for Ralph Maresca Plumbing & Mechanical LLC
Ralph Maresca Plumbing & Mechanical LLC
4.9(
151
)
Tankless Water Heater - Install

Serving Mahwah, NJ and surrounding areas

Approved

In business since 1986

Free estimates

Emergency services offered

"Ralph and helper Peter arrived on time, went right to work, highly skilled, kept area neat and cleaned up fully after finishing, improved work done by previous plumber, also did two unrelated plumbing repairs for washing machine and a hot water line. Dealt with 1955-built house conditions, first rate results. Very happy with heater, work performance, cleanup, and price. Old heater pickup done separately."
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+47

Response time7 hrs
Response rate100%
1 neighbors recently requested a quote
Thomas D. Evans
4.7(
234
)
Tankless Water Heater - Install

Serving Mahwah, NJ and surrounding areas

Approved

Super Service Award Winner

In business since 1997

Free estimates

Customers say: Quality work

"It's always difficult to get someone who is willing to come by to fix those little annoying problems you have, but not Tom. I had 1 leaky faucet and 1 frozen faucet(due to hard water). Tom came explained what needed to be done and I hired him to fix it. Very pleasant to work with. Also cleaned up after all the work was done. I have his card now and will not have to stress when I need a good plumber in the future. No job is too small for Tom!! He will be back in New Year to install a tankless water heater."
Our work
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+22

Response time6 hrs
2 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for Red Van Plumbing & Heating
Red Van Plumbing & Heating
4.6(
64
)
Tankless Water Heater - Install

Serving Mahwah, NJ and surrounding areas

Approved

In business since 2019

Free estimates

Emergency services offered

Based out of Mahwah, Red Van Plumbing & Heating delivers comprehensive commercial and residential mechanical solutions. We specialize in precision gas piping and advanced water treatment and purification system installations. Our certified technicians expertly manage water and sewer main installations, replacements, and repairs for both homes and businesses. We keep your property comfortable with complete sales, installation, and repair services for gas and oil boiler or radiator heating systems. Additionally, we are experts in modern, energy-efficient tankless water heater installations and repairs. Trust our commercial and residential teams for prompt, dependable plumbing and heating craftsmanship.

5 neighbors recently requested a quote
Recommended by91%of homeowners
Avatar for AJ Perri, LLC Plumbing
AJ Perri, LLC Plumbing
3.8(
479
)
Tankless Water Heater - Install

Serving Mahwah, NJ and surrounding areas

Approved (Corporate)

In business since 1971

Credit card accepted

Customers say: True professional

"We had several different technicians working on installing a new water heater in a crawl space. There were several different unexpected occurrences that arose, but the guys were great. They were respectful, curious, helpful, understanding, knowledgeable and extremely patient explaining our oppositions. They were responsive and prompt to some unexpected situations. Highly recommend them, I'm giving the technicians ten stars for their professional and respectful work ethics."
New System Installation
Drain Repair
Response time8 hrs
Recommended by74%of homeowners
Avatar for Premier HVAC Services
Premier HVAC Services
4.3(
229
)
Tankless Water Heater - Install

Serving Mahwah, NJ and surrounding areas

Approved

Super Service Award Winner

In business since 2016

Free estimates

Emergency services offered

"I had a great experience with Premier HVAC replacing my old and leaking water heater. I was impressed that they were able to respond quickly and start working on the same day as my call, especially given the severely cold weather and other plumbers being busy replacing freezing pipes. The plumber was able to work with my very tight kitchen space and narrow hallways, and without having to remove the countertop in my kitchen. I am satisfied with the installation and would definitely consider Premier HVAC for future plumbing needs."
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+38

Response time1 day
Response rate100%
1 neighbors recently requested a quote
Avatar for All Weather Heating & Cooling
All Weather Heating & Cooling
4.5(
70
)
Tankless Water Heater - Install

Serving Mahwah, NJ and surrounding areas

Approved

In business since 1969

Free estimates

Emergency services offered

"I called All Weather to give me a quote for replacing my gas boiler. They set up a time for their salesperson to come over and give me a quote. The appointment was only a few days later and a man named Joe showed up on time. He spent some time with me, I told him I was looking for a new boiler and a new hot water heater, but I wanted to see what options I have (since I was debating going to a tankless water heater). He told me going indirect hot water tank is the best option and they always use this brand that's the "best one out there". Even though he may have been right, he didn't tend to my questions or concerns very well. I felt like he was getting annoyed that I had questions and eventually I just let him run the show just to get him out of my house faster. Especially when he gave me a quote of $8600, it was much higher than I was anticipating. One thing I really didn't like was when he said I'd have to get a permit since I live in an incorporated village, which would be an extra $500, meanwhile I already had another plumber tell me a permits only $200. So I went with another company. So even though I can't rate All Weather on their work quality, I didn't get a good feeling from their salesperson."
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+13

Response time3 days
7 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for Advanced Professional Management, LLC
Advanced Professional Management, LLC
4.2(
939
)
Tankless Water Heater - Install

Serving Mahwah, NJ and surrounding areas

Approved

In business since 1999

Emergency services offered

Warranties offered

"Outstanding service, start to finish. Professional, courteous, constant communication. Isha from the home office was in constant contact - phone, two email confirmations, and texts. She called to ask if the service could start a bit earlier, which was fine with me. Alex arrived promptly, put on shoe booties before entering the house (not necessary here but a nice touch). Alex was outstanding. Young fellow with many years experience, and it showed. He explained each part of the task as he went through it, and answered my many questions related to other potential work I brought up. Getting the anodes out of the water heaters - first time replaced - was a bear. He explained he had to get another socket wrench to loosen the anodes - the ones he had did not fit properly. No charge for that time, which though I expected, has not always been the case in my past experiences. Anodes were locked in tight, and took a while to loosen. Doing one water heater at a time, they finally came out, encased in calcium deposit. He then screwed in the replacement anodes and locked them in. Alex completed all the work, put everything back together including the fans on top of the units, tested, and re-tested. Continuing to explain each step. He took pictures of the work for the invoice, ran me through the details again. Everything done on his tablet computer; I received an immediate email receipt. Excellent work with knowledge behind it. I have an external faucet which needs repair, and may be looking for a whole-house water softener. When time comes to replace the water heaters, Advanced Pro will be at top of my list."
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+33

Response time11 hrs
Response rate100%
8 neighbors recently requested a quote
Avatar for Drip Home Services
Drip Home Services
4.9(
7
)
Tankless Water Heater - Install

Serving Mahwah, NJ and surrounding areas

Approved

In business since 2016

Free estimates

"Dr. Drip Plumbing team did an amazing job at my mom's house in nanuet where they were able to find a leak in the basement, which was a challenging overall job. They had to jackhammer the flooring in order to find a massive crack in a very old pipe and they were able to replace it while also fixing a leaking toilet. Very satisfied with their work and would highly recommend them to anybody. Looking for a great experience for the plumber"
Full bathroom remodel
Full bathroom remodel
Sewer repair
Shower valve replacement
13 neighbors recently requested a quote
Avatar for NJ PLUMBING AND HEATING GUYS LLC
NJ PLUMBING AND HEATING GUYS LLC
4.1(
16
)
Tankless Water Heater - Install

Serving Mahwah, NJ and surrounding areas

Approved

In business since 2025

Free estimates

Emergency services offered

"Travis and Elvis were very professional on the phone. Travis provided detailed information and answered all of my questions to better help me understand between options when I was choosing a new water heater for my home. Travis provided me with a free estimate and stayed within the price range we agreed to when completing the job. The water heater was installed in a timely manner. I also received a follow up phone call to check how the water heater was working and if I had any questions which I appreciated. I would definitely recommend hiring this company and plan to use them again in the future."
30 neighbors recently requested a quote
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