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Top-Rated Water heater repair or service pros in Saint Charles - Updated Nov 2026

Avatar for Dunn Heating Air Conditioning and Plumbing
Dunn Heating Air Conditioning and Plumbing
4.7(
274
)
Water Heater - Repair or Service

Serving Saint Charles, MO and surrounding areas

Approved

In business since 2003

Free estimates

Emergency services offered

"I needed to replace my parents' 40 year old AC Condenser and coil, and replace it with something that worked with the new furnace my father got installed four years prior. They were able to do the work requested, and also offered to redo the furance installation as the previous company installed it right on the basement floor where any backup/water could possibly get into the system. They were very prompt and showed up on time/on schedule. They were very upfront about costs and pricing and there were no last-minute price changes or hidden fees, which I appreciate. Work was done well and they ensured that everything worked before leaving the job site. The gentlemen working were very professional and understanding. I highly recommend them for anyone looking to replace their HVAC or to correct work that was previously poorly done."
Additional Photos
Response time2 days
17 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for MAPLEWOOD PLUMBING
MAPLEWOOD PLUMBING
4.8(
337
)
Water Heater - Repair or Service

Serving Saint Charles, MO and surrounding areas

Approved

In business since 1985

Free estimates

Warranties offered

"The water line for my fridge cracked and it was raining in my basement. They were quick and responsive to coming out and performing the repair. They also said part of a nearby gas pipe was corroded as the leak had been ongoing and recommended replacing it as well. They came out the next morning and performed that repair. Cost was very reasonable for two site visits, labor and materials."
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+7

1 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for Mabudees Property Solutions
Mabudees Property Solutions
5.0(
17
)
Water Heater - Repair or Service

Serving Saint Charles, MO and surrounding areas

Approved

In business since 2023

Free estimates

Credit card accepted

"My pro was Terell, and he was on time, friendly, and professional. He was very knowledgeable about my plumbing situation. After the problem was repaired, I liked how he kept asking if I had questions about any other issues in my house. Great worker!"
Work
Work
Work
Bathroom Shower Remodel
Bathroom Shower Remodel

+7

5 neighbors recently requested a quote
Avatar for Go Time Plumbing Services
Go Time Plumbing Services
4.8(
46
)
Water Heater - Repair or Service

Serving Saint Charles, MO and surrounding areas

Approved

Super Service Award Winner

In business since 2022

Free estimates

Warranties offered

"Wonderful customer service! Came early on a Sunday to look at hot water heater. Replacement installed on Monday in a couple of hours tops. Will definitely be using again for all our future plumbing needs."
Response time6 hrs
Response rate100%
112 neighbors recently requested a quote
Avatar for On Time Experts
On Time Experts
4.8(
104
)
Water Heater - Repair or Service

Serving Saint Charles, MO and surrounding areas

Approved

In business since 2006

Free estimates

Credit card accepted

When your home needs help, count on the team that does Whatever It Takes to make it right. On Time Experts Heating, Air & Plumbing, formerly Hosack Plumbing, Heating & Cooling, now brings together the experience of Hosack and Al-Don. We provide trusted heating, cooling, plumbing, and air and water quality services throughout O’Fallon and the Greater St. Louis area.

Recommended by97%of homeowners
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Showing 1-10 of 100
FAQs for water heater repair or service projects in Saint Charles, MO

Warning signs include fluctuating water temperatures, a pilot light that repeatedly goes out, unusual noises from the tank, or complete heating failure. You might also detect a rotten egg smell, indicating a potential gas leak, or notice water that never reaches the proper temperature. If your water heater is over eight years old and displaying these symptoms, the gas valve is a likely culprit. Professional inspection is recommended, especially if gas odors are present.

Water heater gas valves are not universally interchangeable. Each valve must match your specific water heater's make, model, and specifications. Important compatibility factors include gas type (natural gas vs. propane), BTU rating, connection types, and physical dimensions. Using an incorrect valve can result in poor performance, premature failure, or dangerous gas leaks. Always consult your water heater's documentation or a professional plumber to identify the appropriate replacement valve for your unit.

The Saint Charles, MO homeowners’ guide to water heater repair or services

From average costs to expert advice, get all the answers you need to get your job done.