A Versatile Gas-Fired Steam Boiler For Your Unique Home. If you need a new gas-fired steam boiler (or for the right company to fix your home’s steam boiler) in the Manassas area, Twin Air LLC is here to help. 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 season after season of comfortable heat, look to the GSB8-E. Electronic ignition oversees water temperature and ignites 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 be converted to LP gas Will work with traditional radiator and underfloor heating systems Electronic low water cut-off Large steam chest and multiple supply connections help eliminate noise Available in seven different sizes to fit your home’s individual 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 Twin Air LLC in Manassas is always ready to help you with a new high efficiency boiler! Call us at 703-666-8907 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.