We have had this Jotul Oslo for 2 winters and are constantly having draft issues. We have dry wood (tested for moisture). Outside is very much colder than inside. I have tried all the advice given to no avail. Sometimes it works fine for weeks and then all the sudden we lose the draft. We have an old house so negative pressure is not the problem. Could the problem be that the Oslo has 6" stovepipe venting out the top with an almost 90 degree elbow then it increases to an 8" pipe through the wall and 8" outside steel chimney? The 8" worked great with our old Vermont Casting. I don't know if my stove is defective.