I purchased two F1150s Woodstoves--one for my 480 sqft cabin, the other for a 400 sqft bunkie. I did so based on their specifications--specifically the assertion that the burn time was "up to 8 hours," and that the stove was appropriate for "600-1,200 sqft." I found that even using properly 2 year seasoned dry hardwood, neither of the above were accurate... My chimney is not excessively high, I have short ceilings and lots of insulation. The wood is good quality. Despite this, the maximum burn time, damper fully closed, was 4.5 hours--beyond this I would have to start a new fire. In addition, the stove was insufficient as the sole source of heat. Thankfully my retailer--was very supportive, while Regency themselves took no responsibility, and offered no assistance--to correct a problem entirely created by their specifications. I might add that the Regency sales rep. told me that he "would not have sold me the F1150s, but instead would have sold me the F2450." This is basically admitting that the specifications provide are misleading. When I discussed this with him, he was unpleasant and attempted to blame me... So, make sure you have a good retailer--since Regency themselves are not going to back their product nor take any responsibility. Also, do not buy this stove if it is your only source of heat. I have had Regency stoves for years, and they fit a good price point.... Just a warning about the F1150, and their customer support.