When we bought our 1910 colonial, one feature in our 15'x30' living room that was quite unique was the beautiful fireplace mantle. A couple of cold nights, and fires later, we found that the original fireplace although beautiful was completely inefficient. We tried one of those cast iron Fireback/grate assemblies which did improve performance, but we always had to be on top to experience any warmth. I then looked at a store that had a Vermont Castings Winter Warm Large insert. We negotiated the last floor model and four guys with hernias later, it was installed (this is a large and very heavy unit). Performance on this item is phenomenal- when a full blast fire is roaring, it is almost unbearable to be in that room, and it does a great job heating the second floor. Although I may not have been overly impressed with the installers, the product has been first rate (5 years so far). Including pics of the unit in the room and a closeup.