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Pellet stoves are used as heat sources for homes. They work by burning biomass pallets, which might be composed of wood, sawdust, or food waste. The pellets are stored in the stove's hopper until the stove is ignited, at which point some are released into the stove's firebox to burn for heat. Unlike most fireplaces, pellet stoves have a thermostat that adjusts the temperature by releasing more or fewer pellets, depending on how warm you want to make your living space.

Not all gas fireplaces need a chimney. If you install a ventless gas fireplace, it will release low levels of combustion byproducts back into your living space (instead of pushing them outside through a chimney or vent). Ventless fireplaces burn fuel efficiently, so the emissions are minimal—but they could bother people with allergies or respiratory issues.

Removing a chimney is difficult. You may need to take it out brick by brick from inside the walls. If it’s part of the load bearing structure of the home, removing it becomes even more difficult. Chimney removal cost can range from $1,000 to $10,000, depending on the complexity of the job, and whether or not it’s load bearing. For this reason, many people will choose to remove the fireplace and seal the chimney at the bottom and top. You could remove the visible exterior section of the chimney at the roofline before sealing it, too.

The damper, located just above the firebox, can open or close the chimney flue. The damper should remain closed unless there’s a fire burning in the fireplace. Closing the damper prevents energy loss through the chimney and cold air from seeping into the home during the winter. Opening the damper helps maintain airflow when there is a fire and prevents smoke and gases from venting into the house.