Gas-Fired Water Boilers Provide Years of Efficient Heat.

Gas-fired water boilers provided comfortable, even heat very little noise. What’s even better is their exceptional energy efficiency. At Oak Grove Heating & Air Conditioning in Hattiesburg, most all of the Lennox® gas-fired water boilers we sell are ENERGY STAR® qualified.

Explore the features of our high-efficiency boilers.

GWM-IE Boiler

This ENERGY STAR® qualified, gas-modulating condensing water boiler is 40% more efficient than conventional boilers. As a matter of fact, it boasts a 95% AFUE rating.* To boost fuel savings, it features an electronic ignition control that turns on the burner to coordinate with your household demand to ensure it uses only the energy it needs to keep you warm.

  • Durable, self-cleaning, stainless steel heat exchanger changes waste energy into usable heat
  • Sealed combustion keeps noise at a minimum
  • Modulating capability perfectly meets your comfort needs by allowing the burner to fire at as low as 20% of its capacity
  • Stainless steel mesh burner resists corrosion and oxidation
  • CPVC flue condensate collector is corrosion-resistant and erases 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.

  • Enduring, heavy-gauge steel cabinet with baked-on paint finish
  • Small design for flexible installation options
  • Sealed combustion minimizes noise
  • Electronic ignition monitors water temperature and turns on the burner only when it is needed
  • Burns natural gas or can be converted 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 older radiator systems.

  • Electronic ignition controls water temperature and lights the burner only when needed
  • Thick fiberglass insulation significantly reduces off-cycle heat and energy loss
  • Cast-iron heat exchanger and titanium burners constructed for years of reliable use
  • Offered in six different sizes for ultimate installation flexibility
  • 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-IE Boiler
Efficiency Rating (AFUE): up to 84.4

GWB8-E Boiler

This standard-efficiency boiler can perform for years to come with its long-lasting cast-iron heat exchanger and durable stainless steel burners.

  • Electronic ignition controls water temperature and lights the burner only when needed
  • Thick fiberglass insulation greatly reduces off-cycle heat and energy loss
  • Will work with traditional radiator systems
  • Available in nine different sizes for installation anywhere in your home
  • Burns natural gas or convertible 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 601-268-3486 or schedule an appointment online so our experts at Oak Grove Heating & Air Conditioning in Hattiesburg can help you find the right boiler for you, or ensure your existing boiler is running as it should.