What's up guys? First of all, thanks to all who input on this great forum, I've learned so much. I'm a first-time wood burner, and I just fired up my New Yorker WC 130 this week. I've read similar problems in a few other threads, but didn't wanna thread-jack so I figured I'd start my own, with my specifics. Here's my set up. WC 130 tied into my existing oil furnace with a coil in my ductwork. Chimney is well-insulated steel, 20 foot tall overall, 15 foot above from where the boiler ties into the chimney. Chimney seems to draft well, but I have no way to measure it accurately. Barometric damper (recommended by manufacturer and my dad, a lifetime wood guy) Damper adjusted to open with a good gust of wind, doesn't open under normal conditions. Fan control aquastat is set at 170. I've been burning only oak, seasoned for at least a year. Boiler burns well, doesn't overtemp or anything, idles a lot so far, its been about 40 in the daytime, 30 at night all week (New Jersey) Problem is twofold, and I'd guess related??? Chimney temp at the back of the boiler averages 100-150 degrees at idle, 250 with the blower on. (LeonMSPT noted the low temps with his WC90 also) I'm getting quite a bit of creosote inside the boiler around the door, and inside the chimney, which I saw by looking thru the barometric damper. Since I'm a newbie, I'm not sure how much is too much, but for only burning for 3 days, this sure looks like too much. So what does everyone think? Is it just too warm to be burning? Is my chimney too short? I read that I should be operating with stack temps in the 250 range, is that all the time or just when the blowers on? If it's all the time, how do I raise my stack temps? Any and all advice would be appreciated, thanks a million!