Lennox GWB8-E Gas-Fired Water Boiler

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The Lennox GWB8-E Gas-Fired Water Boiler delivers reliable heating performance and maximizes efficiency by turning the burner on only when needed.

SKU: GWB8-E Categories: ,
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Efficiency all winter long

Lennox GWB8-E Gas-Fired Water Boiler offers an efficiency of up to 83.9% AFUE, meaning it can deliver significant energy savings compared to an older boiler. That means you can enjoy a comfortably warm home all throughout the winter, without worrying about energy use.

Heating Savings

60 AFUE VS. 83.9 AFUE
Heating can account for about half of a home’s total utility bill. By upgrading to a high-efficiency system, you can cut your energy costs while keeping your family perfectly comfortable. See how much money could be saving with a GWB8-E Gas-Fired Water Boiler.

Save per year*
5-year savings 10-year savings 15-year savings
$2,777 $5,554 $8,331
*based on national average

Lennox GWB8-E Gas-Fired Water Boiler – Smart design means reliable operation

  • An electronic ignition allows the GWB8-E to turn on only when heat is needed.
  • An automatic vent damper closes when the GWB8-E shuts off, preventing wasted heat.
  • Layers of thick fiberglass insulation minimize heat loss and on-off cycling.
  • Factory-installed switch protects against potentially dangerous low-water conditions.

Flexibility is a standard feature
To make it a perfect fit anywhere in your home, the GWB8-E is available in 9 different sizes. It also integrates seamlessly into your home’s existing radiator system, and can use either natural or LP gas.

Built to perform, and built to last
The heat exchanger at the heart of the GWB8-E is also designed for lasting durability, over a range of water flow rates. Burners are made of stainless steel for greater resistance to corrosion and oxidation.

Lennox GWB8-E Gas-Fired Water Boiler Warranty

20-Year Limited Warranty on Heat Exchanger; 5-Year Limited Warranty on covered components. This product may be eligible for 10-Year Limited Warranty coverage with product registration.

Additional information



Energy Efficiency

Up to 83.9% AFUE

ENERGY STAR® Certified