VentedVented gas logs are the most popular type of gas logs. They must be installed with a chimney, which limits the heating efficiency. Vented gas logs most resemble a realistic wood fire, more than vent-free logs, and are very flexible which means logs can be repositioned.
Vent-Free (Ventless)Vent-Free gas logs do not require a chimney to be installed in your home. They are very efficient as a primary heat source, because vent-free logs produce high heat! All are equipped with an ODS (Oxygen Depletion Sensor) while special permits may apply. Vent-free gas logs must be laid out in a specific arrangment so that the flame does not come in direct contact with the logs, so you can not reposition your logs.
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