I fired the EKO up this morning, kicked it into gasification mode and went inside to take a shower. When I was ready to leave for work, it was smoking. So kicked the burning wood around in the firebox, threw in a few more chunks, closed the bypass damper and got both nozzles lit off really good. Still smoking a little, though. I'm guessing that there is a little creosote built up on the bypass damper which is not allowing it to close all the way, with the result that a little smoke is leaking up through the chimney. It can't be coming from the gasification chamber, which was full of flame when I checked it. My dealer said that for the first couple weeks of operation, this kind of thing happens. He said I might have to scrape the damper off to get a good seat. For reasons I don't completely understand, these kind of creosote issues disappear after the boiler has run a number of times, he says. I'm guessing it has something to do with the metal curing or breaking in, or whatever. I know that if you overfire the boiler or try to operate it with the damper open, you can warp the damper, probably with similar results. I've never come close to overfiring this boiler because I've never put enough wood in the firebox to generate that much heat and I've never seen the water temp over 82. So I'm guessing it's either the creosote I mentioned earlier, or an air adjustment (cold this morning) or maybe just one of those days. Does this theory make any sense? Anybody with a similar experience? Which leads me to my second question, which is: Do you get steam coming out of the chimney in very cold weather? I wouldn't think so with dry wood, but I don't know.