creosote grease

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kurthood

Member
Jan 27, 2011
24
southern NH
hello fellow pellet admirers,


Did a solid cleaning on the stove today, Harman P61A, and noticed something very different than last year. I had quite a buildup of what I believe to be creosote. But it was more like a thin sheen, and very greasey. It coated mainly the lower half of the stove, on the wall behind the ash pan and around the burnpot. I also cleaned out the vent pipe on the outside of the house, which is about a 6' vertical rise with a jet cap on the top for the candy cane look. Removed the jet cap and the T cleanout on the bottom and reemed an old rag down the run with a pole. The rag came out pretty greasey as well and it literally looked like black grease residue, and wasnt really ashy.

How much creosote do you guys typically see after a season? Is it normal? Seeing it all in the vent work got me concerned about fires combusting in the pipe, and causing a chimney fire or an out of control fire in the stove itself with all the creosote burning off of the sides. Does this stuff just typically burn off after a ripping fire? That would be my guess. I ran the stove fairly soft last winter because it was moved to a new location and the house heated up super quick. Maybe just give it a nice hot burn every now and again to burn off all that nastiness? Interested to hear any experiences you guys may have had or insight. I was also burning a different pellet than last year. Burned Maine Woods 2 years ago and burned Geneva's last year. All pellets are not created equal and im guessing variances in the pellet could have something to do with it as well.
 
I've been burning my P61 for 4 years and I've never seen anything like that.
 
I have seen it in my P68. I burned a lot on low this winter due to new insulation and a very warm winter. I was told that it's the warming and cooling that does it, and if I ran it on stove temp for at least 6-8 hours a week, it would be OK. I'm not going to worry about it. I think the hot summer air loosens it up and that's why it appears greasy rather than more solid. Mine came off like butter when I cleaned it in June after a hot spell.
 
My Harman pellet furnace has the same situation. Like what was said previously probably too much low burn. Mine is in the bottom of the fire box and has not bothered anything so I have not bothered with it. When I do the one ton cleaning I just scrape the bad spots. It is thin and has not built up to any thickness.
 
I have seen it in my P68. I burned a lot on low this winter due to new insulation and a very warm winter. I was told that it's the warming and cooling that does it, and if I ran it on stove temp for at least 6-8 hours a week, it would be OK. I'm not going to worry about it. I think the hot summer air loosens it up and that's why it appears greasy rather than more solid. Mine came off like butter when I cleaned it in June after a hot spell.
it is the byproduct of smoke from long idling shut downs.
 
Check your gaskets. The only time my Harman produced creosote is because I had air leaking in from around the ash pan door and the burn pot door (I have a PB105).

I bought some of the thin gasket material that had adhesive on it on the opposite side of the existing gaskets and my creosote issue went away.
 
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It sounds llike the same stuff that I found in my P-38 , almost backed up to my hopper . I burn a lot at low (idle) setting.
 
I agree with the soft butter texture. most of the junk just cleaned off with a paper towel.
well it seems though that a re-occuring theme is the low heat burning for extended periods. I imagine if the stove gets cranking for an hour+ every once and again that grease will burn right off. Although its not ideal to have it in the first place, I'm glad im not the only one that has seen this crap in the stove.
 
Hey guys and gals...if you have this in your stove understand that running the stove on high for an hour or two will make it dry up. Secondly, you all might want to look into setting your idle draft as shown in the installation guide. Too much air during idle leads to smoke which leads to this problem. Likewise, not enough air in the burn pot at any time will also do this...that is a gasket issue. Door, glass, hopper or burn pot would be the culprit. On occasion, the holes for the igniter wires, a loose fitting or improperly aligned fines collection box and/or seal around the auger bearing may also lead to this but is rare, as air the air that leaks in these places heads on up to the burn pot anyway.
 
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