A Versatile Gas-Fired Steam Boiler For Your Unique Home. If you’re looking for a new gas-fired steam boiler (or for an expert to fix your current steam boiler) in the Ballwin community, Holiday Heating & Air Conditioning is ready to help. We sell the Lennox® GSB8-E, which features a diverse menu of benefits. GSB8-E BoilerThis steam boiler outshines its competition with an 82.7% AFUE rating* and notable 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 it needs to Vent damper increases efficiency by closing automatically when the boiler is 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 Hefty steam chest and multiple supply connections work to eliminate 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 Holiday Heating & Air Conditioning in Ballwin is is here to help you with a new high efficiency boiler! Call us at 636-391-7377 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.