Napoleon Stoves Heater and wall furnace rated 35,000 BTU's and 78% steady state maximum efficiency Shipped Natural Gas, Liquid Propane requires Conversion Kit to LP "Yellow Dancing Flame?" burner system Heat and flame adjustable Compact, easily accessible and user-friendly controls Equipped with 100% safety shut off feature for your peace of mind Heat transferring, high heat ceramic glass Clear, 230 sq. inches of viewing area - 19 1/4" 21 1/4" President's Limited Lifetime Warranty Note: Stove requires Decorative Cast Front (not included, see Related Items); Click here for NECESSARY Pipe Venting