US Stove 1800 Sq. Ft. EPA Certified Wood Burning Fireplace Insert. 2200i. Fireplace Inserts. The US Stove Company 2200i from US Stove is an air tight fireplace insert that will greatly improve the efficiency of your fireplace. With a heavy cast iron door with a cool touch stainless handle, and an air washed ceramic glass surrounded by a cast iron door that allows a magnificent view of the burning fire, it will be a beautiful addition to your existing hearth. It comes with the Hearth Surround to fully enclose the existing fireplace, and is equipped with a spring loaded automatic adjustment to make installation a breeze.