Darden Building Materials

A gas log set is a decorative glass appliance that closely looks like a real wood-burning fire. It’s commonly used when renovating or updating an outdated wood-burning fireplace. One thing that makes gas log sets an amazing choice is that they provide more advanced features, such as automatic ignitions, remote controls, and more. Two common varieties readily available in the market are ventless and vented gas log sets. It would, therefore, be best to read this article to know the maintenance and key differences between the two.


Difference between Ventless and Vented Gas Log Sets

Gas fireplaces usually come in two configurations, ventless and vented. The latter generates carbon dioxide emissions, so your fireplace should have a flue or chimney. Ventless models, on the other hand, don’t produce such emissions. Thus, a flue or chimney isn’t necessary for ventless units. The following further highlights the difference between ventless and vented gas log sets:

  • Function

Ventless gas log sets, also called vent free logs or unvented log sets, use liquid propane and natural gas. When this log set is ignited, the flames run through the gaps in the synthetic ceramic fiber logs. This is responsible for giving the illusion of real wood-burning fireplaces.

The vented gas fire log set, on the other hand, is designed to be used in traditional wood-burning fireplaces and considered a mess-free and safe alternative to real wood logs. It features a natural-looking flame presentation and comes with an extensive ember bed.

  • Aesthetics

Since vented gas log sets don’t burn as clean as their ventless counterparts, their flames appear the same as real wood-burning flames. Ventless log sets usually produce blue flames, so some people say they lack a cozy appeal.

  • Heat Output

Vented log sets can keep your room warm. This log set can perfectly heat a small area, but may take a while to heat or warm things up in larger rooms. Ventless log sets can be your best bet if you are seeking to add an efficient and supplemental source of heat to your home. Unlike the vented log set, ventless units don’t require a flue or chimney to operate. Thus, heat is more likely to stay in your home.

  • Cost

Vented gas fireplace log sets are costlier than the ventless log set. It costs around $3,500 – $8,000 to install or remodel the former. Ventless gas fireplaces, on the other hand, can cost around $1,000 – $5,000.


Ventless log sets are easy to maintain since no flues or chimneys accumulating soot will make you worry. However, these gas fireplace log sets must be serviced and cleaned by a service technician at least once a year to prevent dirt, soot, and dust build-up.

Vented log sets have a chimney that requires maintenance. If soot starts discoloring the log set, use a soft-bristled brush or paintbrush to clean the unit. Avoid using a damp cloth as it can damage the finish. It’s also a good idea to have the chimney and fireplace inspected at least once a year. A ventless log set doesn’t require a chimney, but you still need to get the fireplace checked by a service technician to determine problems early.


Choosing between ventless and vented log sets is easier when you know their differences. If you’re undecided, call Darden Building Materials, and we’ll help you choose the best option for your home. We offer vented and ventless gas log sets and other fireplace accessories such as fire bricks, chimney pots, and ash dumps. Contact us to get a free estimate today.