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Buderus & CREOSOTE!

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Buderus18
Buderus18 Member Posts: 2
I recently had a Buderus Logano wood burning furnace piped into my oil fired hot water baseboard system. The good news is that it heats my 2400 sq. ft. 3 zone house no problem, supplying plenty of hot water. The bad news is the liquid creosote that has totally glazed the firebox! I’m burning now with smaller fire consisting of dry, less than 13% moisture, small split wood at 160 - 180F. Does anyone have experience they can share?

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  • DZoro
    DZoro Member Posts: 1,048
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    Slow burn, small air leakage, low water temp, low chimney temp, wet wood= disaster.
    Need to eliminate all of the above to have successful burn.

  • hot_rod
    hot_rod Member Posts: 22,258
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    Long, hot burns are the best and most efficient way to burn cordwood boilers.

    But that doesnt match the load very well most of the season, if the boiler is sized to cover design day conditions.

    A thermometer on the flue will help see that it is burning hot. A temperature gauge on the return piping, keeping that above 130F when it is up and running.

    buffer tanks are generally always needed to keep a cordwood boiler operating in it's sweet spot.

    There will always be some creosote formation in the fire box especially around the door, the coldest spots in the firebox, for example.

    Check the flue, have it brushed if necessary. A chimney fire will put the fear of God in you :wink:

    Some additional reading for you.
    https://www.caleffi.com/sites/default/files/file/idronics_10.pdf
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • GBart
    GBart Member Posts: 746
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    It's in the manual which I posted and was removed. The factory lays out all the particulars to prevent and limit creosote.