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Pellet Stoves Inserts - Convert Your Drafty Fireplace Into an Efficient Heating Source Pellet stoves can be installed in your existing fireplace or as a stand-alone heating source. They can be highly efficient and use compressed pellets made from wood byproducts like sawdust. They are also "green" since they utilize renewable wood products and emit less carbon dioxide than gas. However, there are some things to consider before purchasing one. It's cheaper Pellet stoves are more efficient tha