Pellet Stoves Inserts - Convert Your Drafty Fireplace Into an Efficient Heating Source Pellet stoves can be placed in your existing fireplace or as a free-standing heating source. They are made of compressed pellets derived from wood byproducts, such as sawdust and can be extremely efficient. They are also "green" https://www.fireplacesandstove.com/products/pelpro-pp70-high-efficiency-pellet-stove-42-500-btu