Lennox GSB8-E Gas-Fired Steam Boiler

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Lennox GSB8-E gas fired steam boiler is constructed of cast iron and titanium for durability. Easily integrates with traditional radiator systems.

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Worry-free performance

Lennox GSB8-E Gas-Fired Steam Boiler offers an efficiency of up to 82.7% AFUE, meaning it can deliver significant energy savings, compared to an older boiler. That means you can relax comfortably about your energy use.

Heating Savings

60 AFUE VS. 82.7 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 GSB8-E Gas-Fired Steam Boiler.

Save per year*
5-year savings 10-year savings 15-year savings
$2,689 $5,378 $8,067
*based on national average

Lennox GSB8-E Gas-Fired Steam Boiler – Efficient in every possible way

  • An electronic ignition allows the GSB8-E to turn on only when heat is needed.
  • An automatic vent damper closes when the GSB8-E shuts off, preventing wasted heat.
  • Layers of thick fiberglass insulation minimize heat loss and on-off cycling.

Durable, dependable comfort
Long life and reliable operation are part of the GSB8-E’s design. That’s why it uses a cast-iron heat exchanger, titanium burners and an automatic low-water cutoff switch.

Versatility that’s always a perfect fit
The GSB8-E works with your home’s existing radiator or under-floor heating system, and is available in 7 different sizes for a perfect fit nearly anywhere in your home.

Choose your fuel source 
The GSB8-E can use either LP gas or natural gas safely and efficiently. So you can choose whichever fuel is most cost-effective in your area.

Lennox GSB8-E Gas-Fired Steam Boiler Warranty

12-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.



Energy Efficiency

Up to 82.7% AFUE

ENERGY STAR® Certified