A Versatile Gas-Fired Steam Boiler For Your Unique Home. Twin Air LLC in Manassas has an excellent gas-fired steam boiler to keep your home cozy and comfortable year after year. The Lennox® GSB8-E comes with exceptional benefits. Our team is ready to install yours, or help you repair your current steam boiler. GSB8-E BoilerThis boiler is superior to other standard-efficiency boilers with it’s 82.7% AFUE* rating, cast-iron heat exchanger and titanium burners. The GSB8-E will provide cozy, comfortable warmth for many, many years. Electronic ignition controls water temperature and turns on the burner only when needed Vent damper bolsters efficiency by closing automatically when the boiler shuts off Thick fiberglass insulation reduces 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 Large steam chest and multiple supply connections reduce 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 Contact Twin Air LLC at 703-754-1062 for all your boiler-related needs in the Manassas area. Or, create an appointment with our online scheduler. We look forward to serving you! *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.