I'm having my F3CB installed this coming Thursday and wanted to know if there have been any mechanical changes made in the past few years to this stove. Additionally, is there a sticker on the stove that will tell me what year the stove was made? I would like to get a new staove but realize that the store might have stoves left over from last year ...... I don't want to make a big deal "insisting" for a 2009 model unless I am certain that improvments to the stove have been made.