I was looking at fireplace inserts like the Quadrafire,and Lopi but I am also now very interested in the Bellfire fireplace. I know that this is not an insert but I am told (by the salesman) that it is a very high heat output efficient fireplace design. I am willing to sacrafice some heat output but still want some supplemental heating. Also, what about the heat lost at night with an open damper? Any comments will be helpful, thanks to all.