Pellet Stoves Inserts - Convert Your Drafty Fireplace Into an Efficient Heating Source Pellet stoves are free-standing heat sources or fireplace inserts that install in your existing fireplace. They burn compressed pellets made from wood byproducts such as sawdust and can be highly efficient. They are also considered "green" because https://www.fireplacesandstove.com/products/comfortbilt-hp22-wood-pellet-stove-with-55lb-hopper