Ok so the Fireview was hooked up on Monday of this week and seasoned by Wednesday. Had my first secondary burn late Wednesday. I really like the stove but am not getting the heat out of it that I expected. The stove is in a room that is approximately 380 sq ft. Walls are 2 by 4 construction with fibreglas bats, windows were all replaced last year. Ceiling is plaster but the insulation above it should be beefed up at some point. Floor is a slab and about a foot above grade. The chimney was originally a mid 60s vintage exterior and then in the late 70s a greenhouse (kept at about 55) was added that covers about 3/4 s of the exterior mass of the brickwork. As such it's not really an interior or an exterior flue - somewhere in the middle. To set up the stove I put a 6 inch liner full height of the flue and I am getting good draft. The liner is not insulated at this point - the wrap would not work in the tile size and the thoughts of mixing the cement based product and pouring it down the flue in mid January did not hold a lot of appeal, so there is just the stainless cap on the top. Stovetop thermometer shows a pretty consistent 350/400 which seems to be in the recommended range. This stove was originally purchased for a different house but that's a long story, it sat for several years before I decided to take the plunge and install it in this one. A major reason I dawdled so long was fear it would blast me out of this room it is in.That is not happening. The only problem I can see with the install is that I do not have a blocker plate at the old damper or a filled/insulated flue. The stove sits very close to the firebox of the old fireplace so my thought is that I am losing a tremendous amount of heat up the flue. The only solution I can see at this point is to do something to stop the flow of air up the chimney. Rather than permanently filling it with the lightweight concrete mix made for that purpose I'm wondering about putting some Roxul into the space above the old damper and then working some into the top below the exterior cap? I've read that Roxul is rated for 2100 degrees .. is this a good solution to the problem I'm having? Adding a blocker plate at the damper would likely do something to solve this but the insulation seems a better approach to me. Beyond the current issue of dealing wiht the cement fill in the flue in the dead of winter I'm also hesitant to go that route because I'm not certain if I will be staying in this house that many years. If I sell, the Woodstock would be coming with me and filling the flue sort of eliminates the use/selling point of it as a fireplace. Thoughts? Other suggestions?