Last year i had a VC Encore installed in my home. They installed it with a 6" pipe going into an old unlined chimney(the installers put a 6" liner down the chimney). We've been through one winter and the stove worked great. No issues at all and the cat/non-cat option worked well. For a VC Encore to be able to be burned with the doors open and the screen in place it calls for an 8" pipe. I asked my installers if we could do this, since my wife and I want to be able to use it as a fireplace sometimes. They said that the chimney was too narrow to try to put an 8' liner in. However, they said perhaps i should look into getting the chimney covered with thermocrete and directly venting the stove into the chimney. I've read on several sites that this is ok and others say its not. Looking for some feedback. We want to convert to the 8" pipe so we can burn with the doors open.