When shopping for gas logs, you'll be asked to choose whether you want vented or vent-free logs. This decision comes down to several factors including looks vs. efficiency, local building codes and placement of the fireplace.

With vented logs, you'll enjoy a large, realistic-looking flame that operates with an open chimney flue, or damper. These logs, which simulate a wood-burning fire, are more decorative than they are efficient as a heat source because much of the generated heat goes up the chimney.

Vent-free logs, which operate with the chimney flue closed, will not give you that roaring fire effect -the flame is not as realistic or as high as you'll find with vented logs. But, vent-free logs are an efficient heat source because 100% of the heat generated stays in your home. You'll often see vent-free logs referred to as "vent-free heaters" because that is essentially what they are. They consist of U-shaped burners with cement logs stacked on top of the heating element. Most sets have a thermostatic control that helps maintain a consistent room temperature. Vent-free heaters add moisture to the air, so it's important to install them in a room with proper ventilation to avoid formation of mildew.

Before installing any gas log system, check your local and state codes. In some localities, vent-free heaters are not permitted. Vent-free heaters are nor permitted in bedrooms, bathrooms or recreational vehicles, and must be installed in an area where curtains, furniture, clothing or other flammable objects are at least 36 inches away from the perimeter of the heater. Vent-free heater installation also is not recommended in high traffic, windy or drafty areas.

Vent-Free
Vented