If you want to stay warm this winter and don’t care if your fireplace looks entirely real, ventless logs should be on your list. These logs are also referred to as vent free, because they burn much less gas than vented logs do. Their false appearance derives from the technology that is included. Basically, there are special burners that will control the amount of gas that is being burned, which in turn keeps carbon monoxide levels down.
They also come equipped with O2 depletion sensors, which work to detect the level of oxygen present. If the oxygen in the detected area drops below a safe level, the gas supply is automatically shut off. The fireplace will stop until the oxygen increases past the safety point. Given that ventless or vent free logs have these systems in place, the amount of gas they burn, and consequently heat they produce, is much lower than vented logs. On the plus side, you don’t need a chimney or flue to run them.
Keep in mind when using ventless logs you need to make sure to control the humidity levels in your home. Both vented and ventless types will generate a significant amount of moisture when burning, but the latter will produce more inside a home as there is nowhere for it to escape. Also, you cannot move these logs. They must be situated in a specific way in order to burn. You must also take care in making sure nothing is directly in front of the fireplace, as they produce a lot of outward heat. Ultimately, if you do not have a chimney or are looking for a way to efficiently heat your home (to an extent), and then ventless logs will work best.