GAS LOG OPTIONS: Vented or Unvented?


There are many valid reasons to choose a gas log set for your fireplace. You might not want the hassle of wood, but long for that little extra ambiance that a fireplace offers. You might want supplemental heat for evening gatherings, but the chimney isn’t usable. Whatever the reason you’re choosing a gas log set, you will need to choose between a vented set or vent-free set.


This is a popular option if you’re converting from wood to gas and the chimney is in good shape. With a vented gas log set you get a very realistic, yellow flame, which is why it’s a popular option. However, with this flame, comes soot and carbon which is released into the chimney. Your certified chimney sweep is able to insure your family’s safety when they install the log set. They will make sure the chimney liner is the correct material, as well as an appropriate size. Installation of a new appliance such as a vented gas log set requires a chimney inspection. This is because of the soot and carbon released by the fireplace. So, you will also need to schedule regular chimney sweeps and inspections to keep your chimney working safely and efficiently.

Many new homeowners would like a fireplace, but maybe there wasn’t one built when the home was constructed. This is a common reason to choose a gas log set. However, without a chimney, you cannot vent it.



Unvented gas log sets make a fireplace possible without a chimney. Homeowners often choose an unvented gas log set if the chimney is unavailable due to disrepair. Also, if they simply want to avoid the hassle of maintaining the chimney.

Because it’s unvented, these gas log sets function differently. For instance, the flame itself is different, which is the first thing most people notice. The flame is blue, which is a result of the way the appliance burns. They actually burn hotter, and cleaner than the vented, or “yellow flame” log sets, and are popular for this reason. Many homeowners overlook the somewhat unrealistic flame because of the fire’s high efficiency and hassle-free maintenance. While you still need to have your appliance serviced by a certified professional, the maintenance will not include a chimney sweep or inspection. In fact, the unvented gas log sets will never require chimney maintenance. They don’t even require an existing fireplace with a chimney. They can be installed in a separate firebox cabinet approved for installation without a chimney. This versatility adds to their popularity. However, because the gasses are not vented out through a chimney, they require certain additional safety measures that vented units do not have.



You’re best option is the one that is right for your home and family. If you think someday you’ll convert back to wood you can choose the vented gas log set, and continue with chimney maintenance while enjoying the realistic yellow flame. If you don’t mind the blue flame, though, but would like a more efficient burn, the unvented log set is probably right for you.

A chimney professional can answer all of your gas log questions today. Anderson’s Coal Energy offers consultation, sales, installation, and maintenance of the best products in the industry. You can contact Anderson’s today at 717-975-3526 to request an appointment.

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