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 burn compressed pellets made from wood byproducts, such as sawdust and can be extremely efficient. They are also "green" since https://www.fireplacesandstove.com/products/cleveland-iron-works-mini-wifi-pellet-stove