• 85% AFUE efficiency • Inducer fan and gas valve modulate for operation between 33% and 100% of capacity for fuel economy • Chimney or Horizontal Vent • Advanced Controls - Digital Display with temperature indication, diagnostics and status symbols showing: Heating mode, Burner On and Burner Modulation Level • Durable Lightweight One Piece Steel Jacket • 10-Year Limited Copper Heat Exchanger Warranty • 2-Year Limited Parts Warranty