Gas fireplaces, including inserts, can be direct-vent or ventless. Direct-vent systems are usually more expensive and less energy-efficient since heat escapes up the chimney.

A typical vented gas fireplace can be fueled by either natural gas or propane (some models run dual fuel) with two vents that run to the outside of your home.

Q. I have a built-in, direct-vent propane fireplace in my living room. The unit was installed nine years ago, and almost immediately, we experienced soot buildup on the glass screen and around the ...

How often do direct-vent propane fireplaces have problems like this? If we decide to replace the unit, our insurance company will have an inspector on site to see whether there is an obvious ...