I am looking for something to replace my old heat n glo. Insert is not allowed in this model. I hope to find something that will fit without the need to modify the front of the fireplace. I can pull it out from the back wall of course looking for something efficient that can actually heat a room. Also would be nice to find something that can use the existing chimney or just have a liner installed. I think I will need it to heat about a 2000 sq foot area. I thought this would be an easy project but I was very wrong.