The Chatham pellet insert offers all the best features that cast Iron has to offer. Solid, timeless construction with detailed patterns and curves. Hudson River Stove Works has incorporated a large cast iron heat exchanger to maximize heat output. The door opens to allow you to enjoy your fire to the fullest and a whisper quiet fan is a standard feature.Cast iron Construction Easy to use controls Modern Surround PanelBTU Range: 50000 Depth: 11 Efficiency %: 85 Fuel Type: Pellet Heating Capacity (sq. ft.): 2200 Height: 21.5 Hopper Capacity (lbs.): 45 Maximum Burn Time (hrs.): 30 Venting (in.): 3 or 4 Width: 21