A Versatile Gas-Fired Steam Boiler For Your Unique Home. If you need a new gas-fired steam boiler (or for an expert to repair your existing steam boiler) in the Carlsbadcommunity, Banister's Heating & Air Conditioning Services is here to help. We offer the Lennox® GSB8-E, which comes with a vast array of benefits. GSB8-E BoilerThis steam boiler is superior to 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 controls water temperature and turns on the burner only when there is demand Vent damper bolsters 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 convert to LP gas Will work 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 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 Banister's Heating & Air Conditioning Services in Carlsbad is ready to serve you with a new high efficiency boiler! Call us at 575-446-3948 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.