useful knowldege

posted December 27, 2010

is always welcome.

Best Made List: Heat Values For Various Woods

As winter marches on and the mercury begins to dip, we turn more frequently to the hearth. One good thing to remember when your building a fire is that your wood selection will effect the amount of heat produced by the fire. As a general rule of thumb the harder the wood the more heat will be produced as it burns. Here are 5 common woods and the number of BTUs (British Thermal Units) produced by the burning of one cord firewood. A cord of firewood is equivalent to a stack 4’ high, by 4’ wide, by 8’ long.

Hickory27,700,000 BTUs
White Oak25,700,000 BTUs
White Ash23,600,000 BTUs
Paper Birch20,300,000 BTUs
White Pine14,300,000 BTUs

It should be noted that these figures are for seasoned firewood. Seasoning is the process of allowing moisture to evaporate from the wood fiber. This takes place over the course of at least a year by letting the wood sit covered outdoors. Unseasoned (or green) firewood will produce only a fraction of the heat that seasoned wood will, since heat energy is expended by evaporating the excess moisture.