I am looking to replace my Hearthstone Heritage stove with a more modern one. The Heritage has always suffered from door latch problems and is no longer airtight - can't control burns. I have settled on either the Jotul F3 CB or the Oslo 500. My house is overly insulated and tight with about 1500 Sq Ft to be heated - two story. We typically keep the bedrooms at 60 and the downstairs about 67. The Heritage has a rear vent into 24 inches single wall into a 30 foot Class A pipe running up an outside chase. There is no vertical rise in the 24 inch horizontal stove pipe and the stove drafts very nice. My question is this: 1. Would the F3 CB heat this size house? With the Heritage, if I get the first floor temp to 67 at night, put in a couple of splits so there is just a few coals in the morning, the first floor temperature only drops about 5 degrees overnight when it is about 25 degrees outside. Also, the advantage of the F3 CB with the short leg kit, it would be a direct replacement for the Heritage meaning I could probably have a about 1/2 inch vertical rise in the horizontal run. 2. If I decide to go with the Oslo 500 with the short leg kit, then my stove would be about 2 inches higher than the wall thimble, meaning I would have a 2 inch negative vertical rise. To compensate for this, I would probably get a heat shield and reduce my horizontal run to under 18 inches, use an outside air kit, use double wall stove pipe, but the smoke is still going to travel down 2 inches before connecting into the wall. Since I have a 30 foot vertical pipe and get good draft now with the Heritage, do you think I could still maintain a good draft with the Oslo 500 based on my less than ideal installation schema? My only other option would be to move the wall exit up a foot, but really would like to try and use the existing connection.