A Versatile Gas-Fired Steam Boiler For Your Unique Home. When you’re shopping for a new gas-fired steam boiler (or for someone to repair your home’s steam boiler) in the Wisconsin Rapids community, Rapids Sheet Metal Works Inc is here for you. We sell the Lennox® GSB8-E, which boasts a diverse menu of benefits. GSB8-E BoilerThis steam boiler rises above its competition with an 82.7% AFUE rating* and notable components like a cast-iron heat exchanger and titanium burners. For season after season of comfortable heat, look at the GSB8-E. Electronic ignition controls water temperature and turns on the burner only when it needs to Vent damper bolsters efficiency by closing automatically when the boiler turns off Thick fiberglass insulation reduces 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 work to 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 Rapids Sheet Metal Works Inc in Wisconsin Rapids is ready to serve you with a new high efficiency boiler! Call us at 715-421-5555 or create an appointment online. *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.