Q&A Winterwarm is puffing

QandA Posted By QandA, Oct 5, 2001 at 2:20 PM

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  1. QandA

    New Member 2.
    Staff Member

    Nov 27, 2012

    hi there,i have a v.c. winterwarm,approx eight years old,i burn oak > that is usually aged two years,this year i have started experiencing > lots of backpuffing.the chimney pipe is clean,could this mean my cat > is going bad ? or what ?the backpuffing takes place mostly at > night,when we put on a log for the night and damp down the stove and > turn off the fan. > please help me out if possible,your site is outstanding...thanks jim >


    You actually solved the problem yourself-------------2 year old oak is "infamous" for creating the backpuffing scenario.

    Overly dry wood, like yours, tends to give off its smoke & gases all at once, versus gradually like wood that has more moisture. At the same time, you'll get a hot fire from this fuel which causes the WW's thermostat flap to close. So now, you have a condition where you have a firebox full of gases, and poor air flow. Eventually, you'll have air entering and mixing with the now super-heated smoke & gases--------poof!!! You have secondary ignition taking place where only primary combustion typically occurs.

    Solution: Use or mix in wood that's less seasoned----wood that has more moisture. And, don't close the t-stat too much. Play around until you find the right combination, but you're wood is usually the source of aggravation.

    Also: Be sure that the combustor is free of ash accumulation.
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