Pellet Stoves Inserts - Convert Your Drafty Fireplace Into an Efficient Heating Source Pellet stoves can be placed in your existing fireplace or as a stand-alone heating source. They can be highly efficient and burn compressed pellets made from wood byproducts, such as sawdust. They are also considered "green" because https://www.fireplacesandstove.com/categories/pellet-stoves/2