Or whatever you want to call them. I was at a loss to explain the smoke I was getting out of my EKO 60, especially first thing in the morning when firing it up. After everything gets going good (i.e., nothing but flames in the gasification chamber and temps climbing) I was still getting a fair amount of smoke out the stack. Given the absense of smoke in the gasification, chamber, I really couldn't figure out what was going on. It would smoke for about an hour, and then burn clean for the rest of the day, no matter what I threw at it. So that was a big mystery. I tried fooling around with the air controls. Managed to get the flame to burn even hotter, but still getting smoke. These things are supposed to burn clean; I've seen mine do it many times. I thought maybe the bypass damper was slightly open, allowing smoke to bypass the nozzles. Turned out not to be the case. I believe what is happening is that at night when I've filled the firebox up and gone to bed, the boiler satisfies the heat demand at times and goes into extended idle periods. When this happens the blowers shut off, but the exhaust still exits through the heat exchanger tubes. In the process, it deposits creosote in the tubes. The next time you fire it up good--usually the next morning--fire shoots into the tubes and burns off the creosote. Since there's no nozzle to burn off the smoke, it exits the old fashioned way, out the stack. This problem can be avoided with hot water storage, I believe, since with an adequate buffer, you can fire the boiler hard and get the heat you want out of it without ever letting it idle. It takes a little practice, but I think it will be relatively easy to time and allocate wood loading to maintain tank temp while keeping the boiler working most efficiently. This is particuarly true with a big boiler like I have, since it's harder to balance output to demand when you don't have storage, especially in relatively mild weather. I've also tried throttling it back by blocking off one of the two nozzles with a firebrick, and that works also works pretty well. So while it's true that you can idle a gasifier, you do see greater emissions (both during idle and later, as noted) and consequently lower efficiency. What's the solution? Stop fooling around on the computer, Eric, and get the damn tank and hx finished!