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

Avatar for H L Bowman
H L Bowman
4.6(
429
)
Tankless Water Heater - Install

Serving Riverside, CT and surrounding areas

Approved (Corporate)

In business since 1946

Free estimates

Emergency services offered

"They were very fast to respond to my call and were able to send someone within two hours. The replacement of the hot water heater went well. For the water pipes they use copper crimp fittings instead of soldering so it will be interesting to see how that holds up over the years. My only concern is how they ran the gas line. They use Gastite CSST which is fine, but the CSST is run so it goes downward then back up and then downward again before it enters black pipe that has a moisture trap. It seems to me that if there is any moisture it will end up in the CSST instead of the trap. In addition, there is a pretty good bend in the CSST right before it goes into the trap section. Also, Teflon tape was used on the all the joints instead of joint compound. I think I will get someone from a different company to come in and take a look at it."
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+6

485 neighbors recently requested a quote
Recommended by86%of homeowners
Avatar for Aldos plumbing
Aldos plumbing
5.0(
35
)
Tankless Water Heater - Install

Serving Riverside, CT and surrounding areas

Approved

Free estimates

Emergency services offered

Small jobs welcome

"When we realized our water heater was leaking, Aldo's was fast both to respond to the inquiry and to get us a replacement; within 36 hours, we were back to having hot water with a new tankless setup. Pricing was within the range we expected and the team was very communicative; I'd hire Aldo's plumbing again!"
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+41

1 neighbors recently requested a quote
Recommended by44%of homeowners
Avatar for Cassidy Plumbing and Heating, Inc
Cassidy Plumbing and Heating, Inc
4.5(
31
)
Tankless Water Heater - Install

Serving Riverside, CT and surrounding areas

Approved

Super Service Award Winner

In business since 1992

Emergency services offered

Warranties offered

"Anji recommended four plumbers. Cassidy was the first to respond on Friday afternoon. One other plumber responded but I could not understand his heavy accent, and he asked me if I wanted him to replace the whole burner assembly. That made no sense to me and I questioned him about it. Suddenly he became "too busy" and hung up the phone. Another plumber didn't respond until Monday morning. Too late. The fourth plumber never responded at all. Cassidy asked if it was an emergency or could wait until Monday. I said Monday. and asked what time? I did not get an answer on Friday. Around 8:30P I called and got an answering service which told me that I wouldn't get a response until Monday because their office closed at 8:00P. I had asked about what time on Monday before 6:00P George arrived Monday morning. He was friendly. He knew what he was doing. He replaced the thermocouple. All work was done neatly and professionally. We have hot water again. I'd use Cassidy again."
Heating System
Heating System
Plumbing
The Team
Navien Water Heater

+3

Response time2 days
Response rate100%
8 neighbors recently requested a quote
Avatar for Comfort Masters
Comfort Masters
4.5(
134
)
Tankless Water Heater - Install

Serving Riverside, CT and surrounding areas

Approved

In business since 2002

Free estimates

Emergency services offered

"Comfort Masters did an excellent and very thorough job installing a new hot water heater and repairing some old plumbing disasters in our new home! Chris was polite and professional, I recommend Comfort Masters without hesitation. Very reasonable pricing as well."
Beautiful shower upgrade
Rain Shower
Soaking Tub
Shower Upgrade
Shower Updgrade

+7

Response time6 hrs
3 neighbors recently requested a quote
Recommended by85%of homeowners
Avatar for First String Plumbing, Heating & Cooling
First String Plumbing, Heating & Cooling
5.0(
10
)
Tankless Water Heater - Install

Serving Riverside, CT and surrounding areas

Approved

In business since 1983

Free estimates

Emergency services offered

First String Plumbing, Heating & Cooling is built on over four decades of hands-on, master-level experience paired with modern equipment, straightforward pricing and a commitment to serving our neighbors near and far.\n\nWe believe every homeowner in Connecticut and New York deserves a team they can count on whenever they need help. When the lights are at their brightest and all eyes are on us, we will always do what is right and that commitment never fades.

Tankless Water Heater
Water Pipe Repair
Water Pipe Repair
Water Heater Install
15 neighbors recently requested a quote
Avatar for Benjamin Franklin Plumbing of Danbury
Benjamin Franklin Plumbing of Danbury
4.4(
7
)
Tankless Water Heater - Install

Serving Riverside, CT and surrounding areas

Approved

In business since 2025

Free estimates

Credit card accepted

We take pride in serving the vibrant community of Danbury, and we understand the unique plumbing challenges that homeowners in this area may face. Whether it's addressing hard water issues prevalent in the region, performing sewer line inspections to prevent root intrusions, or offering eco-friendly plumbing solutions, our expertise is tailored to the specific needs of Danbury residents.\n\nTrust Benjamin Franklin Plumbing of Danbury to safeguard your pipes and preserve the integrity of your plumbing system. With our unwavering dedication to quality, reliability, and customer satisfaction, you can feel confident that your home is in capable hands.

Gallery
Gallery
52 neighbors recently requested a quote
Avatar for Sila Heating, Cooling and Plumbing
Sila Heating, Cooling and Plumbing
4.5(
896
)
Tankless Water Heater - Install

Serving Riverside, CT and surrounding areas

In business since 1989

Free estimates

Emergency services offered

"SILA called to offer their annual heating inspection services given that I was a prior customer. The gentlemen they sent, Ivan, was very knowledgeable and thorough. He went over and above, and spent a lot of time explaining the parts of my boiler to me and likely failure points, gave some recommendations on my aging indirect water tank, and even answered a few questions I had regarding thermostat wiring. He was very patient, and left everything clean and exactly the same was as he had found it. He wore a mask, covered his shoes, and was very respectful. I've used SILA for my annual inspection every year the past five or so years."
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+20

Response time10 hrs
Response rate100%
3 neighbors recently requested a quote
P.D.Q. Plumbing & Heating, LLC
4.6(
68
)
Tankless Water Heater - Install

Serving Riverside, CT and surrounding areas

In business since 1988

Free estimates

Emergency services offered

"I am so pleased with the excellent service and how nice Paul and Jan were. Their price was excellent for my 50 gallon electric heater. Their promptness the next morning was super and the job was done quickly! I highly recommend P.D.Q. and would use them again for both plumbing and heating. So kind too! EC"
 Priceline Building
 Priceline Building
 Going up
Working up high
Recommended by100%of homeowners
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