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A fireplace hearth is a fireproof flooring material that extends out from the base of the fireplace and into the room. Hearths can be made of brick, ceramic, marble, limestone, and more. A hearth serves the purpose of decreasing the fire risk in the area directly around the fireplace. If flying embers hit carpet or wood, they’ll spark and create a fire. But if they hit something like tile or granite, they’ll simply go out.

There are several ways to determine if your chimney or fireplace damper is open or closed. A simple method is to check for airflow by placing your hand near the fireplace opening; if you feel a draft or hear wind whistling, the damper is open. An open damper might also make the room feel cooler, similar to the outdoor temperature, or cause your HVAC system to work harder than usual. For a more definitive test, you can try a visual inspection, although it may be difficult to see. Alternatively, you can light a small piece of paper and observe the smoke; if it is drawn up the chimney, the damper is open. Always use the damper handle to adjust its position.

A liter of bioethanol costs $11 and burns for around four hours, making it cost around $2.75 per hour to keep your bioethanol fireplace running. For comparison, natural gas costs around $0.50 per hour, and propane costs around $1.60 per hour. 

How much it costs you to run your bioethanol fireplace largely depends on how often you use it. Hypothetically speaking, if you run your fireplace for four hours a week year-round, you’ll go through one liter of biofuel per week or about $570 per year to run the fireplace.

The primary disadvantage of a ventless fireplace is that it doesn’t have an exterior venting system. This means that the byproducts from combustion are emitted into your home, which raises some safety concerns. In addition, ventless gas fireplaces produce moisture as they burn—and if there’s no ventilation, you could end up with a mold problem.