Have just ordered a PE Summit Wood Insert on Friday. The order won't be placed until Monday or Tuesday when the dealer said he would get back to me. So I have a little time to possibly make some changes to that order if necessary. But there are other issues before delivery. I'm in an appx 2500 sq ft (1900 downstairs, 600 up) cape cod style house very open plan in Bucks Cty PA area and have had a small Century (SBA) wood insert (1.5 cu ft firebox) for the past two seasons. It has significantly reduced the propane boiler use and cost of fuel. And it gave me a chance to see what's involved in heating with wood. But this size insert just can't really heat the house in cold weather. And it's been a lot of work trying to get as much heat out of it as possible. The insert is in the fireplace in the living room in the center of the house so it should be in a position to heat the house well. When I installed the Century I also installed a 6" flex SS liner 20' kit (chimney is a little less than that and almost all of it is inside the house except for a few feet above the roofline-- so I opted not to insulate.) If I were doing it again I would insulate. The important questions I have now concern the PE Summit I ordered: 1. The install manual has a procedure for setting up for combustion air. What I make of this is, as delivered, it is set up to use outside air (from an ashpit) -- not an option for me, and if using inside room air-- which I have to do-- you are supposed to make an adjustment and remove a part. It seems that it shouldn't make a difference whether you remove that part to use room air, so I'm wondering if removing that box is really necessary or if anyone has experience having done that. I'd rather not remove it, unless it's going to negatively effect the installation in some way I'm not realizing. 2. Not sure my expectations are realistic but what I'm expecting from the Summit is much longer burn times and more heat output to the point I won't have to add much other heat. Also, not having to constantly tend to it to be comfortable--letting fires just burn out without having to constantly replenish them. But maybe I'm expecting too much. My concern is that it isn't going to provide enough heat for the far rooms. 3. Attaching the liner to the insert. Though the Summit will fit (according to specs), the fireplace is only 23.75" high to lintel. It looks like fitting the appliance connector into the flue collar may be difficult. I had a real problem with the Century partly because of the sloped back and having to bend the liner into 45 degrees and getting it into position. After wards I realized if I could have reached up through the stove through the flue collar and drawn down the liner it would have been much easier. Now I see that Regency and Osburn offer kits for that where there is a bolt fitted through the diameter of the connector and left in place. You just reach up through the collar and grab the bolt shaft and pull the connector (attached to the liner) down into the collar. (See installation manual for regency 3100 p.7 or Osburn 2400 p.16 for pictures of those parts). It doesn't appear PE offers that. Am wondering if there would be a problem if I were to not use a kit but just to drill two holes in the SS appliance connector and run a bolt with washers and nut through them -- to be able to pull the liner into position and leave that bolt in place. My concern is that there may be flue gas leakage around those holes -- might not be completely airtight. Not sure whether that should be a concern and/or is there a remedy. The dealer has agreed to deliver the unit and place it on my hearth. I'm planning on installing myself and figure I should be able to slide it in place myself. The dealer (who is new to PE) didn't offer an appliance connector since PE doesn't provide one. He seemed to have the idea you just connect the collar to the liner. Based on my reading of the install instructions, a connector is necessary. But I'm planning on reusing the one from my Century. 4. Question about the embossed regular sized surround. I was never able to actually see it other than the picture, and my concern is that it might end up not looking good. The thing is I might end up not even using it. I could possibly get away without using the surround, but then I don't have the unit in front of me so can't see all of the issues there may be. I think that's about it. My main concerns are the combustion air setup, and what to do about the flue connector, and overall that I'm not out of line with the Summit Insert.