Pellet Stove Fireplace Pellet stove fireplaces are offered as freestanding models or installed into existing chimneys that burn wood to give new life to old, drafty fireplaces. They operate by using a thermostat to measure the temperature of the room and feed pellets into the fire at the right rate. https://www.fireplacesandstove.com/products/pelpro-pp70-high-efficiency-pellet-stove-42-500-btu