Pellet Stoves Inserts - Convert Your Drafty Fireplace Into an Efficient Heating Source Pellet stoves are freestanding heat sources or fireplace inserts that fit inside your fireplace. They are made of compressed pellets derived from wood byproducts like sawdust and can be highly efficient. They are also "green" as they https://www.fireplacesandstove.com/categories/pellet-stoves