Sophisticated and Efficient Fireplace Inserts. For a quick and easy rehabilitation of your existing fireplace, a gas, electric, 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, 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.