You can adjust the flames, and they don't waste heat the way the older models did by trapping it inside, or the way wood-burning fireplaces do by letting most of it escape out the chimney or flue. Contemporary fireplaces demonstrations that something pretty can be completely practical. And convenient. There are no ashes or dead embers to clean out regularly, and there is no need to be able to light a fire with newspaper. If you already have a wood burner, you can get a new gas insert to convert that old fireplace into a better fireplace.
A fireplace glass door is installed on a fireplace to keep the room warm longer when the flames die down. Whether a wood burning fireplace or a gas burning fireplace, heat radiated into the room escapes through the chimney. One does not notice this while the fire is burning brightly, because of the heat from the flames that radiates into the room. However, when the fire starts to die down, the hearth becomes cold quickly as the heat escapes through the fireplace opening. To stop this from happening, a fireplace glass doors blocks the opening, keeping the warm air from leaving the room.