Hi everyone. First post on this forum. I tried looking around a bit but could not find any threads that answered my questions. Hope someone here can help. I have a defiant 1910 that I bought new in December of 2000. I have used it every year but I don't run it full time. Instead I just fire it up when it gets really cold so perhaps 1 - 2 cords a season. It's always worked fine and I have replaced some of the gaskets over the years. However I have never opened up the catalytic converter box or done any major maintenance. I have had the flue cleaned every other year and the general feedback from the chimney sweep is that the flue is pretty clean. I am lucky enough to have a good source for red oak and I usually season it for several months myself so the fuel source is pretty clean. Anyway I am wondering if it's time to really go through the unit and replace parts or maybe even get a new one? I read that these can be pretty expensive to maintain. Are parts still available? I'm really open to suggestions including replacing the whole unit. What do you think? Thanks for any feedback.