How is a vent-free appliance different than vented products?
All vented gas and solid-fuel fireplaces lose some or most of their useable heat straight up the chimney or vent. For example, vented gas logs installed in a wood burning fireplace typically burn 30,000 to 60,000 Btus/hour, and the fireplace damper must be totally open, resulting in most of the heat escaping up the chimney. Depending on the design chosen, a vent-free gas log in the same fireplace would burn only 26,000 to 40,000 Btus/hour, and virtually all of the heat produced would be delivered into the living space. Therefore, the savings in fuel costs with a vent-free gas log are tremendous, and the resulting comfort from the fireplace is dramatically increased versus a vented appliance or burning wood.
