A Versatile Gas-Fired Steam Boiler For Your Unique Home. WM J Kraus & Son in Keokuk has an excellent gas-fired steam boiler to keep your home snug and comfortable year after year. The Lennox® GSB8-E comes with remarkable benefits. Our experts are happy to install yours, or help you maintain your existing steam boiler. GSB8-E BoilerSetting it apart from other standard-efficiency boilers, this boiler earned an 82.7% AFUE* and features a cast-iron heat exchanger and titanium burners. The GSB8-E will deliver cozy, comfortable warmth heating season after heating season. Electronic ignition controls water temperature and turns on the burner only when needed Vent damper boosts efficiency by closing automatically when the boiler turns off Thick fiberglass insulation minimizes 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 Big 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 Call WM J Kraus & Son at 319-524-3714 for all your boiler-related needs in the Keokuk area. Or, set up 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.