Traditional wood burning is the original technology of fireplaces. It uses a passive draw system to remove combustion from the home. Tempered air from the home is used to supply the fire with oxygen. The heat of the fire rises through the vertical flue and creates a lift similar to hot air rising in the atmosphere. This pulls the various particles of combustion, through the flue system and out of the home. Manufactured wood burning fireplaces utilize a metal double-wall, air-cooled flue system.
High efficiency wood burning fireplaces have increased in popularity in recent years due to technological advancements in product and consumer demand for a secondary efficient heating source. There are two aspects that create a higher efficiency wood burning product:
1) Pull the majority of the combustion air from outside the house.
2) Control the combustion air flow in order to extend the burn time of the wood.
High efficiency wood burning fireplaces utilize either "Class A" insulated piping or a double-walled, air-cooled flue system.