Contemporary gas burning fireplace inserts serve an important purpose. The best gas fireplace inserts can fit right into the space of your old masonry wood burning fireplace. This is great news for homeowners with a masonry chimney. It is an excellent remedy for rejuvenating any room and can easily take the place of your unit utilizing a masonry chimney. Kozy Heat has contemporary inserts and traditional gas log inserts for existing fireplaces, which allow you the option of also venting a gas fireplace through an existing chimney.