Gas-Fired Water Boilers Provide Years of Efficient Heat.

Gas-fired water boilers offer comfortable, even heat with little to no noise. What’s better is their excellent energy efficiency. At ACS Inc in Metro Atlanta, many of the Lennox® gas-fired water boilers we offer are ENERGY STAR® qualified.

Read more about the details of our high-efficiency boilers.

GWM-IE Boiler

This gas-modulating condensing water boiler is ENERGY STAR® qualified and 40% more efficient than conventional boilers. As a matter of fact, it boasts a 95% AFUE rating.* To maximize fuel savings, it uses an electronic ignition control that turns on the burner to meet your household demand to make sure it uses only the energy it needs to keep your family cozy.

  • Reliable, self-cleaning, stainless steel heat exchanger changes waste energy into usable heat
  • Sealed combustion reduces noise
  • To meet your comfort needs, the modulating capacity allows the burner to fire as low as 20% of capacity
  • Stainless steel mesh burner resists corrosion and oxidation
  • CPVC flue condensate collector is corrosion-resistant and removes the use of metal in the venting area.
  • 15-year limited warranty on heat exchanger, 10-year limited warranty on remaining covered components
GWM-IE Boiler
Efficiency Rating (AFUE): up to 95
Energy Star badge

GWB9-IH Boiler

The GWB9-IH boiler effortlessly integrates with a traditional radiator system and is ENERGY STAR qualified with an AFUE rating of 90%.* Its cast-aluminum heat exchanger moves heat quickly—as much as three times faster than a conventional cast-iron exchanger.

  • Durable, heavy-gauge steel cabinet with baked-on paint finish
  • Small design for installation flexibility
  • Sealed combustion minimizes noise
  • Electronic ignition monitors water temperature and ignites the burner only when it is needed
  • Burns natural gas or convertible to LP gas
  • 15-year limited warranty on heat exchanger, 10-year limited warranty on remaining covered components
GWB9-IH Boiler
Efficiency Rating (AFUE): up to 90
Energy Star badge

GWB8-IE Boiler

Far more efficient than an older boiler, the GWB8 boiler boasts an 84.4% efficiency rating*—plus, it works with conventional radiator systems.

  • Electronic ignition oversees water temperature and turns on the burner only when needed
  • Thick fiberglass insulation minimizes off-cycle heat and energy loss
  • Cast-iron heat exchanger and titanium burners designed for years of durability
  • Available in six different sizes for ultimate installation flexibility
  • Burns natural gas or convertible to LP gas
  • 20-year limited warranty on heat exchanger, 1-year limited warranty on remaining covered parts
GWB8-IE Boiler
Efficiency Rating (AFUE): up to 84.4

GWB8-E Boiler

Built with a long-lasting cast-iron heat exchanger and durable stainless steel burners, this standard-efficiency boiler can perform year after year.

  • Electronic ignition oversees water temperature and turns on the burner only when needed
  • Thick fiberglass insulation minimizes off-cycle heat and energy loss
  • Compatible with traditional radiator systems
  • Comes in nine different sizes for installation anywhere in your home
  • Burns natural gas or can convert to LP gas
  • 20-year limited warranty on heat exchanger, 1-year limited warranty on remaining covered parts
GWB8-E Boiler
Efficiency Rating (AFUE): up to 83.9

Give us a call at 770-939-7500 or schedule an appointment online so our team at ACS Inc in Metro Atlanta can help you find the right boiler for you, or ensure your existing boiler is running as it should.