Pellet Stove Fireplace Pellet stove fireplaces are freestanding models, or they can be placed in existing wood burning chimneys which can give new life to aging drafty fireplaces. They work by using a thermostat to gauge the room temperature and then feed pellets into the fire at the appropriate rate. https://www.fireplacesandstove.com/products/castle-serenity-pellet-stove-with-smart-control