St. Charles, IL Navien Tankless Water Heaters

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Doc's HVACstarstarstarstar3.8 / 5

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16 Total Reviews /files/docs-logo-300-135.jpg630-965-9444$648 North St Suite 101, Geneva IL

Doc's HVAC has been installing domestic water heating systems for DuPage County, IL homeowners and businesses for almost 20 years. If your existing hot water tank in Chicagoland is more than 8 - 10 years old, or if you starting a new project, a new efficient and reliable Navien® tankless water heater from the Riebe family at Doc's may be you best treatment.

  • If you've been suffering from not having enough water, the best treatment in a new Navien tankless water heater.
  • If your hot water heater is on life support call the Doc.
  • We can install a new system stat, with 24 /7 service available.
  • We will always diagnose your hot water needs, discuss the treatment options with you, and deliver a perfect outcome for water heating system.
NAvien Boilers

Navien Tankless Water Heaters

Gas fired tankless water heaters are more and more popular throughout our service area in DuPage County, Illinois. We are Navien® tankless dealers. Navien® is a technology leader in wall-hung boiler and on demand water heaters. At McGrath Refrigeration Heating & Air Conditioning, we feature these product families:

Navien Boilers


  • Efficiency UEF 0.97
  • Max Input BtuH Range 150.0-240.0
  • # of Models 4
  • ComfortFlow®? No
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Navien Boilers


  • Efficiency UEF 0.95
  • Max Input BtuH Range 180.0-240.0
  • # of Models 3
  • ComfortFlow®? Yes
Schedule Your Estimate
Navien Boilers


  • Efficiency UEF 0.81
  • Max Input BtuH Range 160.0-199.0
  • # of Models 3
  • ComfortFlow®? No
Schedule Your Estimate
Feature Tank Style
Water Heater
Navien Tankless What It Means To You
Efficiency UEF: 0.60 or less Up to 0.97 UEF 1/3 lower operating cost
First Hour Rate Rate 71 Gal. 300 Gal. Much high hot water capacity
Recovery Rate 40 Gal. 300 Gal. Never run out of hot water with tankless
Operating Control Millivolt Control Self Diagnostic Safer and easier to service
Venting Chimney Direct Vent Sealed Combustion Safer and more flexible
Floor Space Required Aprox. 40 Sq. Ft. 0 - Wall Hung Tankless requires no utility space
Equipment Life 8 - 12 Years 20+ Years Better investment
Armstrong Furnace

Tankless Repair

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

Key Navien® Features Include:

  • Ultra condensing UEI efficiencies of up to 0.97 saving hundreds of dollar per year in most applications.
  • Venting:
    • 2" PVC venting up to 75 feet for NPE models
    • 3" x 5" concentric venting for NPN models
  • Stainless Steel heat exchangers resist corrosion better than typical copper
    • Dual stainless steel heat exchanger on NPE models
    • Single stainless steel heat exchanger on NPN models
  • All NPE model Navien® tankless models are EnergyStar Qualified.
  • NaviLink Wi-Fi remote control system gives you optional control anywhere you have internet access
  • They carry a up to a 15 year warranty in residential settings
  • NPE-A models feature ComfortFlow® built-in hot water recirculation. ComfortFlow® features an insulated buffer tank and recirculation pump. This provides virtually instant hot water delivery to your points of use, and sharply reduces potable water waste.
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Tankless Water Heater Repairs

We offer tankless water heater repair service regardless of brand. Our licensed and factory trained service techs have the experience to help. For more information about tankless water heater repair and maintenance click here.

Replacement Tank Style Water Heaters

We offer complete gas or electric tank style water heater installation and repair services. Click here for more information.

If you want to know if a tankless water heater is the right treatment option for your St. Charles, IL area home or business contact the Doc. Our factory trained tankless technicians will evaluate you home and your hot water needs water to help you decide Navien® tankless is right for you.

Home Healthcare Check

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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!
Licensed and Insured:
We are licensed and insured heating and air conditioning contractors.
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!

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