Posted by jdemaris on December 20, 2009 at 19:01:27 from (67.142.130.11):
In Reply to: OT : Creosote posted by Southtowns27 on December 20, 2009 at 18:16:01:
Interesting problem. I've got two wood furnaces going all the time. One heats my house and the other by workshop and barn. Both have superinsulated Canadian stainless pipe. I don't know how much difference that makes, but the Canadian specs are better then the USA specs. Much higher burnout ratings and much more insulation, so the pipes stay hotter. I had trouble buying it here in NY.
I always get that thick, rock-hard creosote layer on my single wall pipes down low that connect the furnaces to the the stainless - but never in the stainless itself. I have to break it out with a pry-bar or screwdriver.
How often do you let your chimneys run real hot? That might be the difference. Since mine are run in turned-down mode a lot, I make sure I overfire them at least once a week. When I do, often the main chimney starts to ignite (the creosote inside it), so I've got to be careful and damper it down when it does, and keep it in control. I'll add though, that my system is virutally fire proof. I wouldn't do the overfire in a questionable chimney. It is also the reason why so many chimney fires start on Christmas. People chuck their wrapping fire in the furnace or stove, and it flashes so hot, the creosote in the chimney catches fire.
There's no getting around the fact that old-style furnaces like your Clayton, or my Woodchuck and Thermocontrol 500 are only efficient when being run with a hot fire, and are going to soot up when run with dampers near closed. You have to compensate somehow.
I'm also wondering about your wood. If all your wood hardwood and it all well dried? I had some bad creosote problems years back when I burned red oak that only seasoned one summer (here it needs two summers). Also, soft conifers like pine, spruce, and hemlock will also gum it up.
I have my doubts that a chimney sweep is going to help with rock-hard creosote. But who knows? Explain your problem and ask before you pay someone to make the trip to your home.
The old timers used to run their fires red hot once every day. Some even threw accelerant in there to make it flash. And, that was with crappy chimneys.
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