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

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

Serving Cortland, 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
365 neighbors recently requested a quote
Recommended by88%of homeowners
Avatar for Four Seasons Heating & Air Conditioning
Four Seasons Heating & Air Conditioning
4.3(
3,298
)
Tankless Water Heater - Install

Serving Cortland, 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 WORX PLUMBING LLC
WORX PLUMBING LLC
5.0(
5
)
Tankless Water Heater - Install

Serving Cortland, IL and surrounding areas

In business since 2025

Free estimates

Credit card accepted

WORX PLUMBING LLC is dedicated to providing our customers with the best quality and \ncraftsmanship. We are here to build relationships with our customers and communities and to provide our employees with a great place to work. We look forward to working with you!

Logo
Well Water Filtration
Well Water Filtration
Avatar for R & G Heating and Cooling
R & G Heating and Cooling
5.0(
6
)
Tankless Water Heater - Install

Serving Cortland, IL and surrounding areas

In business since 2022

Free estimates

Credit card accepted

"Marco from R & G did an excellent job replacing the water heater at my rental property. I have called him many times for a variety of services at different locations. He is very professional, and I recommend him to anyone looking for HVAC services."
Recommended by100%of homeowners
Avatar for Windy City Rooter Inc
Windy City Rooter Inc
4.2(
73
)
Tankless Water Heater - Install

Serving Cortland, IL and surrounding areas

In business since 2001

Free estimates

Emergency services offered

"They did a fantastic job. They showed up on time and were very professional throughout the whole process. I was concerned about the project because it was a big job but they reassured me along the way and I saw first hand how efficiently and professionally coordinated the whole process. I have not had any water leaks so they successfully solved the problem!!! I would highly recommend them."
Western Springs - Leak Repair in Foundation
Western Springs - Leak Repair in Foundation
Western Springs - Leak Repair in Foundation
Recommended by94%of homeowners
Showing 1-10 of 19

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