Sophisticated and Efficient Fireplace Inserts. For a quick and easy rehabilitation of your existing fireplace, a gas, electric, gel fuel, pellet or wood burning insert adds sophisticated ambiance and energy efficiency to your home without disrupting your existing hearth and mantel. Easily convert your ancient, idling wood fireplace with a safe and efficient gas, electric, gel fuel, pellet or wood burning insert. With a number of available trim options and sizes you can sit back and enjoy a view of blazing logs while updating your home with radiant or circulating inserts in lengthened glass and zero clearance designs.