Closed combustion fireplaces, on the other hand, have heating efficiency ranging from 70 to 85 percent, with heat loss ranging from 15 to 30 percent. They consume nearly a third of the wood used in an open fireplace, making them significantly more environmentally friendly and cost-effective. Open fireplaces are inefficient because they burn more wood and produce a lot of ash.

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Exposed fireplaces generate a continuous slide of warm moist air into the fireplace, resulting in approximately a 75 percent energy loss as well as a 25 percent warming effectiveness. Additionally, wood is burned in a contained chamber behind a glass door, preventing sparks and smoke from entering your room. Cleaning is simple because there is little waste and it is done every week. A fire burning within an enclosed chamber is referred to as closed combustion. Sealed combustion fireplaces operate by limiting the volume of air that reaches the firebox. The flame optimizes the utilization of oxygen and wood, resulting in a slower burning process, hence the term slow combustion. As a result, the heat output improves.

Flue pipes are used to extract smoke from closed combustion fireplaces. Installing flue pipes correctly provides an upwards draught, removing smoke from the fireplace and ensuring that it runs efficiently. Primary and secondary air flow controls are standard on most closed combustion fireplaces.

Ventilation nozzles just at top of the building would typically allow oxygen to pass inside a sealed burning fireplace behind a window, creating an air curtain that will sweep smoky and ash aside from the door frame. If the glass becomes stained, clean it with a ceramic glass cleaner. Make sure the wood is well-seasoned. Dry wood is suitable for closed combustion fires. When starting a fire, try to use a combination of hard and softwoods. A nice combination is Sekelbos and Blackwattle.