Pellet Stoves Inserts - Convert Your Drafty Fireplace Into an Efficient Heating Source Pellet stoves are either free-standing heat sources or fireplace inserts that install in your existing fireplace. They are made of compressed pellets derived from wood byproducts such as sawdust and can be highly efficient. They are also https://www.fireplacesandstove.com/categories/pellet-stoves/2