More than 20 years ago we bought an insert for the fireplace, from Sears, called a heat exchanger. It had an electric fan that set on the hearth and blew air through a series of pipes, that served as the grate, then warm air out into the room. We're now looking for another of this type. I don't remember it being very expensive at the time. Sears no longer carries them and I'm not having any luck when doing a search, or checking with local fireplace and hardward stores. Does anyone know if these are still being made today and where they can be purchased?