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High efficiency, modulating gas-fired condensing combination water boiler

GCWB95 Boiler
Price Guide
Efficiency Rating (AFUE)
up to 95
Energy Star®
View Full Product Specifications

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The pinnacle of efficiency

At 95% AFUE, this natural gas combination boiler is remarkably efficient
and 2021 ENERGY-STAR® Most Efficient. So that perfectly warm air and an endless
stream of hot water comes with minimal energy waste.

Learn more about Lennox awards for innovative initiatives in product design.

The pinnacle of efficiency
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Real-time comfort

Faster heating times deliver both home heating and hot water on demand.
You can run the dishwasher, do a load of laundry, and take a shower without running out of hot water.

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Perfectly pinpointed adjustments

Self commissioning allows this combination boiler to make its own adjustments during installation for immediate comfort that’s perfectly tuned to your home.

Ratings & Reviews

See what other customers are saying about
GCWB95 Boiler

5 Stars 5/5
December 17, 2023

5 Stars 5/5

True to core product

May 26, 2023

Descent product that was purchased by me last year and i'm so happy with this

Green check mark

Yes, I recommend this product.

Gary David


Age: 35 to 44

Gender: Male

Reason for Replacement: New home purchase

Warranty Satisfaction:
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  • 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.
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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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