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

Avatar for N. H. Ross, Inc.
N. H. Ross, Inc.
4.7(
190
)
Tankless Water Heater - Install

Serving Riverhead, NY and surrounding areas

Approved

In business since 1976

Credit card accepted

Customers say: True professional

"Paul showed up at 8 as promised.. inspected the job an Attic Fan install & remove old unit . Did everything as he explained was needed & finished with everything completed 100% by 2 pm ! Great service hire this company they are totally professional"
Tankless
5 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Mayjac Plumbing, Inc.
Mayjac Plumbing, Inc.
4.6(
15
)
Tankless Water Heater - Install

Serving Riverhead, NY and surrounding areas

Approved

In business since 2015

Small jobs welcome

Offers commercial services

"For years I have wanted to update my very old and inefficient American Standard cast iron boiler. I was very fortunate to find Mr Joe Burriesci the owner of Mayjac Plumbing who took the time to evaluate the best options, since the old boiler handled two apartments. We collectively decided to go with two Navien Combi Condensing Boilers, but the best part of the entire process was how meticulous the installation was done. From start to finish Mayjac Plumbing kept every promise and timeline made. I highly recommend Mayjac Plumbing..."
Before Installations
After installations
Whole House PVC Piping 7
Whole House PVC Piping 6
Whole House PVC Piping 5

+16

Response time10 hrs
2 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for South Shore Plumbing and Heating, Inc.
South Shore Plumbing and Heating, Inc.
4.8(
114
)
Tankless Water Heater - Install

Serving Riverhead, NY and surrounding areas

In business since 2016

Free estimates

Credit card accepted

"South Shore Plumbing & Heating were true professionals. They came, wrote up the estimate and installed the tankless hot water system. They went over the device with us and answered all our questions. I will recommend them to family and friends."
west hampton alpine
sunrise
Laars Combi
Peerless oil boiler
Peerless oil boiler 2

+7

Response time9 hrs
Recommended by99%of homeowners
Avatar for APV Mechanical Inc
APV Mechanical Inc
4.8(
89
)
Tankless Water Heater - Install

Serving Riverhead, NY and surrounding areas

In business since 2005

Free estimates

Credit card accepted

"John was right on time, knew his business, did the install in a timely fashion, and the price quoted over the phone was the price we paid. Very happy with the work performed and would recommend and use again."
Additional Photos
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+2

Recommended by91%of homeowners
Avatar for Braido Heating & AC
Braido Heating & AC
5.0(
25
)
Tankless Water Heater - Install

Serving Riverhead, NY and surrounding areas

In business since 1978

Emergency services offered

Credit card accepted

"Repairman, Andrew, came and located the problem. The ignitor had burned out, so the burners would not light. Andrew did not have the part in his truck but was able to fit in a used part from another furnace to give me heat until he got the other part. I got a call the next day and scheduled a time to put in the exact part. Again, repairman was within the stated time window. Heat working well."
Additional Photos
Additional Photos
Recommended by100%of homeowners
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