Our fireplace inserts are basically fireplaces in a metal box that fit into your existing masonry fireplace to transform it into an efficient source of heat. Traditional open fireplaces can have efficiency ratings as low as 15% and can actually draw the heat out of your home! Our wood burning inserts can achieve efficiency ratings as high as 71% and may be used as a primary heat source in a mid-sized home. And you won't lose the view with our huge, stay-clear glass doors.