Is that the ID of the tiles? If so, look at the Duraliner system. One option is preinsulated in oval.Here is a pic of the chimney. I would like to insulate, I'm just not sure it'll be possible. On the plus side, 1. this stove will not be run that often, and 2. I'm going to improve the chimney relative to what the prior stove was running on. If I can figure out how to insulate it though, I will. Just not sure how it's possible with the dimensions of the clay tiles (11" X 6.5").
Not an issue with this stove. It is a steel stove at heart.I'll definitely be careful with the stove temps.