Pellet Stoves Inserts - Convert Your Drafty Fireplace Into an Efficient Heating Source Pellet stoves can be free-standing heat sources, or fireplace inserts that are installed inside your fireplace. They can be extremely efficient and can burn compressed pellets made of wood byproducts, such as sawdust. They are also "green" https://www.fireplacesandstove.com/categories/stoves