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

Avatar for R.A. Mechanical, Inc.
R.A. Mechanical, Inc.
4.7(
363
)
Tankless Water Heater - Install

Serving Naperville, IL and surrounding areas

Approved

Super Service Award Winner

In business since 2016

Free estimates

Emergency services offered

"Tankless water heater went on the fritz last Monday. Submitted HomeAdvisor request for quote and Rob called almost immediately. Took some pictures of the old unit and plumbing and had an all in reasonable estimate. They came out next morning (to the city no less) and installed new unit in a few hours, explained everything and tested and was within estimate. Very knowledgeable and professional. Have great hot water on demand. Wife is very happy as our old Eternal tankless struggled ever since we moved in 3 years ago. Very happy with the recommended Navien and installation from RA."
Misc
Misc
Misc
Misc
Misc

+63

Response time5 hrs
380 neighbors recently requested a quote
Recommended by88%of homeowners
Avatar for Aqua Knight Plumbing Co.
Aqua Knight Plumbing Co.
5.0(
16
)
Tankless Water Heater - Install

Serving Naperville, IL and surrounding areas

Approved

In business since 2023

Free estimates

Emergency services offered

With 24 years of experience we are dedicated to providing our clients with the very best in service, installation, and repairs for all phases of your plumbing needs. We specialize in a variety of residential and commercial services from water heater installations, sewer main installations, sump pump installations, repairs and so much more! We take pride in the attention to detail put into each of the projects \nwere involved with. Were known for our quality work and the integrity of our business. We look forward to building long-term relationships with our clients, and guarantee your satisfaction. \n \nAll Work Is Warrantied - Inquire Within \n \nMilitary Veteran and First Responders Discounts Available - Inquire Within \n \nDeposits May Be Required - Inquire Within \n \nAccepts Cash, Checks & Major Credit Cards \n \nFinancing Options Are Available - Inquire Within \n \n24/7 Emergency Services Available \n \naquaknightplumbing.com

New Sump Pit
Outside Clean Out
Outside Clean Out
March 2026
July Clog Log

+171

5 neighbors recently requested a quote
Recommended by31%of homeowners
Avatar for All Affordable Plumbing Inc
All Affordable Plumbing Inc
4.9(
178
)
Tankless Water Heater - Install

Serving Naperville, IL and surrounding areas

Approved

Super Service Award Winner

In business since 2006

Emergency services offered

Warranties offered

"Alfonzo arrived on time and was extremely polite and professional. Him and I looked at the work I wanted completed together. He gave me two options. A more in detailed option and a less detailed option. Both prices were within the quoted amount. We went with the more detailed approach because of where we wanted our garage heater placed. Alfonzo was here for three hours. He had a lot of cuts to do to make this work. The outcome is awesome. Looks great in the garage and in my basement. He even took off his shoes every time he came in my home and carried them to the basement to finish his work. I would highly recommend!!!"
Pipe was completely packed! Drain cleaning was not going to do the  job here!
Master Bath - Chicago
Geberit wall mounted toilet carrier installed. Wall mounted faucet installed. Hall Bath.
You can see the crud inside the pipe accumulated over 60+ years!
Old Broken Clay pipe just outside the foundation wall.

+41

Response time11 hrs
Recommended by96%of homeowners
Avatar for Plumb It Best LLC
Plumb It Best LLC
4.8(
254
)
Tankless Water Heater - Install

Serving Naperville, IL and surrounding areas

Approved

In business since 2009

Free estimates

Emergency services offered

"After buying a water heater at Menards and getting it home, I called Plumb-it Inc about 1:30 p.m on a Monday. I think it was Scott who answered (no recorder!) and he said he could have 2 guys out to our house within 45 minutes to install it. The job went so smooth. They did arrive within 45 minutes. The 2 guys were very knowledgeable about installing a heater. They were efficient, quiet, polite and cleaned up afterwards. They also took the old heater and the box the new heater came in. What more could we ask for? They did everything we expected."
Drain Cleaning
New Sump drain
Closet Bathroom
Response time1 day
Response rate93%
1 neighbors recently requested a quote
Avatar for Copper Sky Plumbing
Copper Sky Plumbing
4.8(
55
)
Tankless Water Heater - Install

Serving Naperville, IL and surrounding areas

Approved

Super Service Award Winner

In business since 2012

Free estimates

Emergency services offered

"It was very easy to schedule this work. The crew was friendly and efficient. I expected to clean up afterwards, but they did a great job of that too. The pricing is reasonable and I highly recommend Copper Sky Plumbing!"
Electric to Gas
Original bathtub before
Demolition has begun
Shower walls are removed, bathtub is sawed in half for removal.
Ready to begin installation of new shower.

+39

Response time11 hrs
Response rate100%
1 neighbors recently requested a quote
Avatar for Four Seasons Heating & Air Conditioning
Four Seasons Heating & Air Conditioning
4.3(
3,298
)
Tankless Water Heater - Install

Serving Naperville, IL and surrounding areas

Approved (Corporate)

In business since 1971

Free estimates

Emergency services offered

"It couldn’t have gone better! Carl was experienced, knowledgeable and friendly. Plus, he smelled gas which is why he replaced the valve on my water heater. It was a great visit!"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Response time9 hrs
44 neighbors recently requested a quote
Recommended by86%of homeowners
Avatar for DLA Sewer & Drain
DLA Sewer & Drain
5.0(
26
)
Tankless Water Heater - Install

Serving Naperville, IL and surrounding areas

Approved

Emergency services offered

Customers say: True professional

"Talk about above and beyond. Dorian texted me immediately and FaceTimed to instruct how to shut off the gas and water line at 8 o’clock at night. He was at my door before 8 the next morning ready to work. He had the water heater replaced and the area cleaned up before I heard from another plumber. The work was excellent and he was the most cost effective. 10/10 would use again and recommend to anyone needing his services."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+5

Response time7 hrs
Response rate100%
Recommended by61%of homeowners
Avatar for DRF Trusted Property Solutions
DRF Trusted Property Solutions
3.4(
85
)
Tankless Water Heater - Install

Serving Naperville, IL and surrounding areas

Approved

In business since 1985

Free estimates

Emergency services offered

"They gave me several choices for the water heater where other companies only carried one or at least did not offer others. I also appreciated the fact that they gave me a quote over the phone. They were knowledgeable about their craft and expedited the installation once I had made a decision. I also liked that I could buy the toilet myself and they quoted just the installation so I did not have to pay the mark up for the hardscape. I am changing all of my plumbing needs to this company."
 Lawn sprinkler systems provide water savings
 DRF provides same-day water heater installation
Tankless water heaters save up to 30% in energy
 DRF uses PVC for durability and efficiency
 DRF has 24-hour emergency water heater service

+18

Recommended by68%of homeowners
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