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High efficiency, gas-fired condensing water boiler

GWB9-IH Boiler
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Efficiency Rating (AFUE)
Energy Star®
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Smart with energy use

With an efficiency rating of 90% AFUE, the GW9-IH boiler allows you to stay comfortable during even the coldest weather, without worrying about energy costs 90% of fuel is converted into usable heat.

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Flexible installation means you have options

The GWB9-IH is designed to integrate easily into a traditional radiator system. Its compact design allows flexible installation inside your home for easy replacement of an older boiler with a higher efficiency model.

Flexible installation means you have options
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Illustration of Tested and proven for<br>
dependable performance

Tested and proven for
dependable performance

Tested and proven for
dependable performance

With a corrosion-resistant cast-aluminum heat exchanger, you can take comfort knowing the boiler will deliver dependable performance, season after season.

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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 exchangers. So you enjoy rapid warmth when you need it.

Comforting warmth, right when you want it

Ratings & Reviews

See what other customers are saying about
GWB9-IH Boiler

5 Stars 5/5
January 18, 2022

5 Stars 5/5
July 13, 2021

5 Stars 5/5
March 29, 2021

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  • Annualized Fuel Utilization Efficiency (AFUE)
    A measure of furnace heating efficiency. The higher the AFUE, the more efficient the furnace.
    Learn More
  • Energy Star®
    ENERGY STAR® is a program of the U.S. Environmental Protection Agency (EPA) designed to help consumers and businesses save money by choosing energy-efficient products and technologies. Heating, ventilation and air-conditioning (HVAC) equipment with the ENERGY STAR® label meets or exceeds federal guidelines for energy-efficient performance.
    Learn More
  • Heat Exchanger
    A heat exchanger is a heating component that is located in the furnace and transfers heat to the surrounding air, which is then pumped throughout the home.
    Learn More
Energy Star

Proper sizing and installation of equipment is critical to achieve optimal performance. Split system air conditioners and heat pumps (excluding ductless systems) must be matched with appropriate coil components to meet ENERGY STAR criteria. Ask your contractor for details or visit

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