Lennox GWM-IE High Efficiency Home Boiler

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The GWM IE boiler offers efficiency ratings of up to 95% and can maintain a precise temperature without constant on and off cycling and operational noise.

SKU: GWM-IE Categories: ,
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Steam heat from the efficiency experts

Lennox GWM-IE High Efficiency Home Boiler offers an efficiency of up to 95% AFUE, meaning it converts up to 95% of its fuel into useable heat. Fuel flexibility lets you use either natural or LP gas as a heat source.

Heating Savings

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 GWM-IE Boiler.

Save per year*
5-year savings 10-year savings 15-year savings
$3,693 $7,386 $11,079
*based on national average

Lennox GWM-IE High Efficiency Home Boiler – Smart design, smarter comfort

Inside the heat exchanger shell of the GWM-IE, specially designed helical tubes optimize condensing, allowing near-complete recovery of useable heat from the fuel source.

Technology with the power to save you money
The modulating capability of the GWM-IE allows the burner to fire at different levels of heat, down to 20% of its full capacity. So your comfort and energy use are always kept in perfect balance.

Quietly innovative
Continuous modulation allows the GWM-IE to maintain a precise temperature without constantly cycling between on and off. This not only reduces operating sound levels, but it also increases reliability.

ENERGY STAR qualified
With an efficiency of up to 95% AFUE, the GWM-IE boiler can mean several hundred dollars per year in energy savings.This product has been designated as one of the Most Efficient ENERGY STAR certified products in 2018. Products that are recognized as the Most Efficient of ENERGY STAR in 2018 prevent greenhouse gas emissions by meeting rigorous energy efficiency performance levels set by the U.S. Environmental Protection Agency.

Lennox GWM-IE High Efficiency Home Boiler Warranty

15-Year Limited Warranty on Heat Exchanger; 10-Year Limited Warranty on covered components.

Additional information



Energy Efficiency

Up to 95% AFUE

ENERGY STAR® Certified