A Versatile Gas-Fired Steam Boiler For Your Unique Home. Rapids Sheet Metal Works Inc in Wisconsin Rapids has the ideal gas-fired steam boiler to keep your home warm and comfortable for years to come. The Lennox® GSB8-E provides remarkable benefits. Our friendly staff is ready to install yours, or help you fix your current steam boiler. GSB8-E BoilerA cast-iron heat exchanger, titanium burners, and an 82.7% AFUE* rating set this steam boiler apart from other standard-efficiency gas-fired steam boilers. The GSB8-E will deliver cozy, comfortable warmth for years to come. Electronic ignition monitors water temperature and lights the burner only when needed Vent damper boosts efficiency by closing automatically when the boiler is off Thick fiberglass insulation helps minimize off-cycle heat and energy loss Burns natural gas or can convert to LP gas Compatible with traditional radiator and underfloor heating systems Electronic low water cut-off Big steam chest and multiple supply connections help eliminate noise Available in seven different sizes to fit your home’s unique needs 12-year limited warranty on heat exchanger, 1-year limited warranty on remaining covered parts Efficiency Rating (AFUE): up to 82.7 Product Brochure Contact Us to Learn More Contact Rapids Sheet Metal Works Inc at 715-421-5555 for all your boiler-related needs in the Wisconsin Rapids area. Or, create an appointment with our online scheduler. We look forward to serving you! *Annual Fuel Utilization Efficiency (AFUE) measures how efficient the appliance is in converting its fuel’s energy into heat over the course of a year.