Hello All! I've got a Lopi Revere with a flex. SS liner in a masonry fireplace in a poorly insulated drafty old house of about 3000 sq. ft. With proper fan placement and staying at home all day feeding it wood to the tune of 700-800 degrees it does an O.K. job. A newer addition was put on the house (before I bought it) and a zero clearance piece of junk was installed. I have a Napoleon 1400i just sitting on my porch. I am considering swapping the Lopi out with the Napoleon and installing the Lopi in the ZC. I don't know the anatomy of a ZC or what a ZC's chimney liner is like. The Lopi manual states it can be installed in a ZC but I am confused about the liner. With safety being the big factor here... do ZC's chimney's tolerate less heat? Do I have to remove the liner and install another? Are liner's ever installed inside another liner? The Lopi calls for a 6" liner if the ZC's is 6" can I just hook up to that? Will I get more heat out of the Napoleon over the Lopi if I do the swap only and nothing more? I am also considering selling one of my inserts and installing a gas unit in the ZC. Answers/suggestions, advice/advise please.