Top-rated water heater repair or service pros.

Get matched with top water heater repair or service pros in O Fallon, MO

Enter your zip and get matched with up to 3 pros

Matching on HomeAdvisor

Share some details icon
Share some details about your home project.
Match with local pros icon
Within moments, match with highly-rated local pros.
Compare quotes icon
Compare quotes and choose the best pro for the job.

Find Water heater repair or service pros in O Fallon

Avatar for Super Handy Man, LLC
Super Handy Man, LLC
4.9(
116
)

Serving O Fallon, MO and surrounding areas

Approved

In business since 1999

Free estimates

Emergency services offered

"Don was wonderful. He responded to my request quickly and gave me a fair estimate. He was incredibly professional, on time, and went above and beyond in pointing out suggestions to improve the functioning of my house and save money. He is the first handyman I've hired that didn't try to up-sell me or beat around the bush with pricing. Excellent service that I can't recommend highly enough. Definitely saved the number for anything else that may come up around the house!"
Response time5 hrs
Response rate87%
26 neighbors recently requested a quote
Avatar for Anton's Plumbing, Heating/Cooling & Energy Experts
Anton's Plumbing, Heating/Cooling & Energy Experts
4.8(
460
)

Serving O Fallon, MO and surrounding areas

Approved (Corporate)

Super Service Award Winner

In business since 1979

Free estimates

Emergency services offered

"Craig and Ethan did a nice job replacing a drain pipe today damaged by a water main break and causing a leak into the basement . They were knowledgeable, neat, and efficient. A very good hvac company provides relysbke plumbing service too!"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+18

Response time1 day
Response rate86%
15 neighbors recently requested a quote
Avatar for Hosack Plumbing Heating & Cooling
Hosack Plumbing Heating & Cooling
4.9(
320
)

Serving O Fallon, MO and surrounding areas

Approved

In business since 2009

Warranties offered

Credit card accepted

"I want to thank Hosack Plumbing, and Kent, for getting my situation cleaned up quickly and professionally. My water heater install is perfect, my water pressure spot on thanks to the new PRV, and is ready for inspection. Kent was thorough, professional, and very clean. He noticed my mask when I answered the door and wore a kn95 mask the whole time. The life coaching advice was an added bonus. Kent's work was great and I'm very pleased with the service provided."
.
.
.
.
.

+2

Response time6 days
10 neighbors recently requested a quote
Recommended by93%of homeowners
Avatar for Dunn Plumbing, Heating and Air Conditioning / Dunn One Hour Heating and Air Cond
Dunn Plumbing, Heating and Air Conditioning / Dunn One Hour Heating and Air Cond
4.8(
249
)

Serving O Fallon, MO and surrounding areas

Approved

In business since 2003

Free estimates

Emergency services offered

"This was a complex retrofit tankless water heater installation and out of 30+ companies called and solicited for this project, Brett and Dunn's HVAC was the only company to 1) entertain performing the installation correctly (gas line sizing and calculations), 2) had prior experiencing working with tankless heaters, and 3) took the time to work with me on a long list of specifications. These are bulletproof systems if the installation is done correctly and Dunn/Brett took the time to ensure the install was on point and everything went smoothly. They also installed a softener and filtration system. Everything went well from bid to install and I highly recommend Brett and Dunn's - will use again as I could not be more pleased!"
Additional Photos
Response time2 days
24 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Ambassador Plumbing L.L.C
Ambassador Plumbing L.L.C
5.0(
36
)

Serving O Fallon, MO and surrounding areas

Approved

In business since 2019

Free estimates

Emergency services offered

"Received a prompt response when contacted to set up a time. Timothy showed up on time, completed repairs, and we have had no issues with any of his work. Did a great job at a competitive price. I would definitely use him again or recommend him!"
Response time1 day
Response rate99%
Recommended by100%of homeowners
Avatar for Go Time Plumbing Services
Go Time Plumbing Services
4.9(
40
)

Serving O Fallon, 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 rate94%
134 neighbors recently requested a quote
Avatar for Collective Enterprise
Collective Enterprise
5.0(
14
)

Serving O Fallon, MO and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Free estimates

Emergency services offered

"Mr Sam did a wonderful job removing a bad water heater and installed a new one. He also reconfigured my plumbing under the kitchen sink and installed a new sink and faucet. He was on time, polite, patient with my son who asked a million questions, and left a tidy workspace when finished. I am excited to hire him again for my many other projects that are needing done. I highly recommend this company. "
Response time2 days
Response rate92%
1 neighbors recently requested a quote
Showing 1-10 of 14
FAQs for water heater repair or service projects in O Fallon, 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 O Fallon, 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.