A Versatile Gas-Fired Steam Boiler For Your Unique Home. If you need a new gas-fired steam boiler (or for someone to repair your existing steam boiler) in the the Main Line community, O'Brien Heating & Air Conditioning is here for you. We have the Lennox® GSB8-E, which boasts a vast array of benefits. GSB8-E BoilerThis steam boiler rises above its competition with an 82.7% AFUE rating* and exceptional components like a cast-iron heat exchanger and titanium burners. For years of comfortable heat, look to the GSB8-E. Electronic ignition monitors water temperature and ignites the burner only when there is demand Vent damper boosts efficiency by closing automatically when the boiler turns off Thick fiberglass insulation helps minimize off-cycle heat and energy loss Burns natural gas or convertible to LP gas Compatible with traditional radiator and underfloor heating systems Electronic low water cut-off Hefty 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 O'Brien Heating & Air Conditioning in the Main Line is is here to help you with a new high efficiency boiler! Call us at 610-257-7035 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.