Pellet Stoves Inserts - Convert Your Drafty Fireplace Into an Efficient Heating Source Pellet stoves can be installed within your fireplace as a stand-alone heating source. They are highly efficient and use compressed pellets made of wood byproducts, such as sawdust. They are also "green" as they use renewable wood https://www.fireplacesandstove.com/categories/pellet-stoves