Hours: We are open 24/7

2183 West Terra Lane, O'fallon, MO 63366

(314) 513-0385

How can we help?

With skilled installation, upkeep, and repair of your hot water heater, Reliable Heating and Cooling satisfies your goals for lower costs, greater efficiency, and long-term reliability.  Our certified technicians match your specific requirements to the ideal product and provide effective service.  We deliver an ample supply of clean, hot water to consumers across O Fallon, MO & surrounding communities.

Your Source for Water Heater Installations

Proper sizing and quality products are essential to the performance of your water heater.  Reliable Heating and Cooling optimizes efficiency and longevity of your system, by accurately calculating the size and demand of your household.  Whether you’re interested in traditional tank-style units or a tankless water heater, our experienced professionals recommend options that maximize the value of your purchase, and provide quick, tidy, and accurate installation.

Considering a tankless water heater?  We’d be happy to explain the advantages and help you determine if this innovative solution is right for you.  While these systems cost a bit more initially, you can easily recover the investment through longer service life and minimized monthly costs.  There’s no standby energy waste.  No waiting for water to heat up and no running short of hot water.  And you’ll free up a great deal of space.

Call Reliable Heating and Cooling for water heater repairs, service, and installations!
O Fallon, Saint Peters, Lake Saint Louis, Wentzville, and Saint Charles, MO

Minor problems with the operation of your water heater don’t necessarily signal the end. The trained specialists from Reliable Heating and Cooling can diagnose your system and perform cost-effective repairs.  We answer your hot water demands with solutions that hold up to constant use year after year.  For emergency situations, our fleet of service trucks are always available to provide skilled assistance, 24 hours a day, 365 days a year, and are outfitted with a full range of quality replacement parts.  For new installation, replacement, maintenance, or trustworthy repair, Reliable Heating and Cooling delivers prompt, professional, and affordable service across O Fallon, Saint Peters, Lake Saint Louis, Wentzville, and Saint Charles, MO.

Water Heater Service in O Fallon, MO | Water Heater Repair Saint Peters, MO

Water Heaters, Water Heater Replacement, Hot Water Heaters, Water Heater Repair & Water Heater Installation O Fallon, MO, Saint Peters, MO, Lake Saint Louis, MO, Wentzville, MO & Saint Charles, MO

Water Heater Maintenance in O Fallon, MO | Water Heater Replacement Saint Peters, MO

Water Heater MaintenanceWater Heater Service ∴ Lake Saint Louis, MO ∴ Saint Charles, MO ∴ Wentzville, MO

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Customer Reviews
What our customers are saying

I had a system malfunction on Sunday evening December 12, 2022 on my Carrier Infinity ICS purchased in 2008.I am a first time caller to Reliable. Marty called me back and had his Tech dispatched at 8 AM the next day. The unit had failed and was dangerous to use. He had a new system by the next morning. They installed it and I was completely satisfied with their service and response time. I overwhelmingly recommend Reliable and will be using them from now on.


Have been with them for more than 10 years. They provide exceptional service…from the time they call to remind you about setting an appointment to the actual service day. Derek (and all their other technicians) are knowledgeable, professional, prompt, and open to listening to questions and pay attention to details. Never had a problem with anything. Thank you for a job well done. Good pricing.

Seema Chouhan

Had a small gas leak for a property I was helping a friend sell and we found out late last night. We reached out to Reliable H&C and Derrick was over first thing in the morning. He was friendly, professional and knowledgeable. He answered my questions with a smile. Derrick was a rock star. Will absolutely call him again. Bravo

Connor Kapp

Reliable has installed and maintained our last 2 furnaces and AC. Our experience with them has been great. Just yesterday we had an issue with our AC. I talked to Marty and he said he’d have someone out the next day. They even were able to accommodate us with an afternoon call. Derrick arrived promptly on time and had us up and going again in 15 minutes (bad capacitor on the condenser unit fan motor). With the prediction of high 90 temps, we were so thankful to have AC working again.

Keith Scherer

We had a emergency water leak problem with our AC unit in the basement of our recently purchased condo. Called Reliable and Derrick was there within a couple of hours. He was polite, knowledgeable, and friendly. Derrick quickly found the problem and repaired it. He also checked the system overall, pointed our some concerns and answered all my questions. I can’t say enough about how satisfied we were with Derrick and Reliable Heating & Cooling! We would definitely recommend them!!! Thanks again!!!!

Terry Mills

We have used Reliable Heating and cooling for all of our heating and cooling needs. We needed some water heater work and Ralph came out and took care of it right away. Ralph was very professional and knowledgeable. He got the job done very quickly and everything is working great! I always recommend Reliable to family and friends. They truly are Reliable!

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