Multi-Position 80% AFUE Gas Furnace Features Include: Four-Position Furnace: Upflow, Horizontal Right, Horizontal Left, Downflow Electric Control Center Adjustable Heating Air Temperature Rise, Led Diagnostics and Self Test Feature Hot Surface Ignition (HSI) WFMR - Furnaces Are Approved For Use with Natural Gas or Propane Gas with Conversion Kit. WFML - Approved For Use In Low Nox Air Quality Management Districts. Limited Warranty* 1 Year Unit Replacement Limited Warranty 20 Year Heat Exchanger Limited Warranty * 5 Year Parts (With An Additional 5 Years If Properly Registered) Limited Warranty To The original Purchaser Only For Owner-Occupied Dwellings - See Warranty Certificate For Details.