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Pellet Stove Inserts Pellet stove inserts can be inserted into existing fireplaces to boost the efficiency of your home's heating. They use compressed sawdust made from recycled wood byproducts in order to create warm fire. Certain models come with large hoppers, which can help reduce the need for refills. Other features include bay-windows for watching the fire, and air wash systems that keep glass in good condition. AGP Pellet Stoves AGP pellet stove inserts can be fitted into fireplaces that are drafty