St. Charles, IL Tankless Repair

Schedule the Tankless Water Heater Repair You Need

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6 Total Reviews 630-965-9444$902 S Randall Rd, St. Charles IL

For almost two decades, Doc's HVAC has provided award winning tankless water heater repair and maintenance service for DuPage and Kane County, IL residents. If your tankless water heater is causing you pain, call the Doc. In an emergency, we make house calls 24 / 7. We will professionally diagnose the problem, propose proper remedies, and then with your approval, restore your heating system the health.

Doc's HVAC is Here for You

  • 24/7 Emergency Service Available
  • Your Local Tankless Experts
  • Accredited & Highly Reviewed

Re-invented Water Heating:

Our customers agree. Once you own a tankless water heater you'll never settle for an old style tank water heater again. How great is it to never run out of hot water again?

As good as tankless systems are, they are technically advanced. Properly servicing tankless water heaters, regardless of brand, requires extensive training, parts support, and years of experience. Doc's offers emergency service for all modern brands and models of tankless water heaters including Bosch, Navien, Noritz, Rheem, Rinnai and more. Common service issues experienced by tankless water heater owners include:

  • Water quality issues:
    • Scale build-up causing reduced efficiency and capacity
    • Clogged or restricted inlet filters
  • Installation related issues:
    • Intermittent flame failures often caused by improper gas pressures
    • Improper condensation or condensation leakage resulting from improperly supported or pitched venting system
    • Unacceptable wait times for hot water or changes in hot water wait times
    • Variable outlet water temperatures often cased by pressure balance issues caused by pressure balance problems on facets of tube and shower valves
  • Environmental issues:
    • Block or obstructed air inlet or venting cause by recent snowfall or organic debris
  • If you're considering a new tankless water heater we feature industry leading Navien tankless systems. We'll evaluate your water heating needs, and prescribe the perfect tankless solution. Click here for details.

Tankless Water Heater Maintenance


An annual check-up with the Doc is a great way to ensure that your tankless water will live a long and happy life. We offer tankless water heater check-ups for both homes and businesses. A typical tune-up includes complete system inspection, system test operation, inspection and cleaning of the inlet water screen, inspection and flushing of the heat exchanger, a complete vent inspection, and then a final complete run test.

Schedule furnace repair with Doc's HVAC Today

The Old Way: Conventional Gas and Electric Water Heaters


While we love tankless water heaters, hot water tanks are still extremely popular and are the most affordable replacement system. Click here for more information.

Tankless Water Heaters

Tankless Installation

Doc’s can also replace or install a new high-efficiency Navien Tankless Water Heater

Home Healthcare Check

Enjoy Peace-of-Mind by joining our maintenance program

Doc's is Family Owned:
Since 2002, Doc's HVAC has been owned and operated by Mike and Dana Riebe. Doc's is an active member of the St. Charles, IL area community.
Better Business Bureau:
Check out our five star reviews on our local BBB. We are more than proud of our A+ BBB rating!
Voted #1 By Our Customers!:
Voted Best Heating and Air Conditioning in 2020 by readers of the Kane County Chronicle and the St. Charles Daily Herald!
Licensed and Insured:
We are licensed and insured heating and air conditioning contractors.
ArmstrongAir® ComfortTeam Dealers:
We have been recognized as a local Armstrong Air® Comfort Team dealer. This recognizes our long term commitment to training and customer support.

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