A Versatile Gas-Fired Steam Boiler For Your Unique Home. When you’re shopping for a new gas-fired steam boiler (or for an expert to repair your current steam boiler) in the Florissant neighborhood, B & B Heating & Cooling is here for you. We sell the Lennox® GSB8-E, which features a long list of benefits. GSB8-E BoilerThis steam boiler outshines its competition with an 82.7% AFUE rating* and noteworthy components like a cast-iron heat exchanger and titanium burners. For years of comfortable heat, consider the GSB8-E. Electronic ignition monitors water temperature and turns on the burner only when needed Vent damper bolsters efficiency by closing automatically when the boiler is off Thick fiberglass insulation minimizes off-cycle heat and energy loss Burns natural gas or can be converted to LP gas Works with traditional radiator and underfloor heating systems Electronic low water cut-off Big steam chest and multiple supply connections reduce noise Available in seven different sizes to fit your home’s particular 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 B & B Heating & Cooling in Florissant is is here to help you with a new high efficiency boiler! Call us at 314-838-9800 or set up 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.