A gas fireplace insert burns gas and is inserted into an existing masonry fireplace. If you have a masonry fireplace that needs a facelift, an insert is there to fill the gap and rejuvenate your room. This means that it will exclusively take the place of your masonry fireplace, by connecting the insert to the chimney and flue leading outside. Inserts are a low cost option compared to a complete renovation to install a gas fireplace or completely replacing your existing masonry fireplace. This is yet another reason why a gas insert is so versatile. A fashionable choice, inserts can change the ambience of a room from traditional or rustic to contemporary.