Lennox GWB9-IH Gas-Fired Water Boilers

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Lennox GWB9-IH high efficiency, 90% AFUE, gas fired boiler works with traditional radiator systems to provide precise heating comfort.

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Smart with energy use

With an efficiency rating of up to 90% AFUE, Lennox GWB9-IH Gas-Fired Water Boilers allows you to stay comfortable during even the coldest weather, without worrying about energy costs.

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 GWB9-IH Gas-Fired Water Boilers.

Save per year*
5-year savings 10-year savings 15-year savings
$3,341 $6,682 $10,023
*based on national average

Lennox GWB9-IH Gas-Fired Water Boilers – Flexible installation means you have options

The GWB9-IH is designed to integrate easily into a traditional radiator system. Its lightweight and compact design allows flexible installation inside your home. Fuel flexibility lets you use either natural or LP gas as a heat source.

Tested and proven for dependable performance
Every unit is fire-tested and inspected prior to shipping to ensure the highest possible degree of operating reliability. So you can take comfort knowing the boiler will deliver dependable performance, season after season.

Comforting warmth, right when you want it
The cast-aluminum heat exchanger in the GWB9-IH transfers heat three times faster than conventional cast-iron heat exchangers. So you enjoy rapid warmth when you need it.

ENERGY STAR qualified
When you choose ENERGY STAR qualified heating and cooling products like Lennox GWB9-IH boiler, you know you’re making a smart choice that can significantly reduce your monthly utility costs. Lennox offers a wide variety of home heating and cooling products that have earned the ENERGY STAR® label. Each of these products has been designed to deliver year-round energy savings, along with other comfort-enhancing benefits, such as more even temperatures, better humidity control and consistent airflow. If you install a new ENERGY STAR® heating or cooling system, you may qualify for local utility rebates and other energy incentives​.

Lennox GWB9-IH Gas-Fired Water Boilers Warranty

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



Energy Efficiency

Up to 90% AFUE

ENERGY STAR® Certified