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Pellet Stove Inserts Pellet stove inserts are designed to fit into existing fireplaces and improve the efficiency of heating in your home. They use compressed sawdust made from recycled wood byproducts in order to create warm fire. Certain models have hoppers with large capacities, which reduce refilling needs. Other features include bay windows for viewing the fire and air washing systems to keep the glass clear. AGP Pellet Stoves AGP pellet stove inserts fit into fireplaces with drafty walls