All depends what you pay per ton. Also takes a bit different handling than a wood-fire.
I suspect most deaths from coal burning are from CO poisoning, whereas deaths related to wood-heat are from wood-fires. That's not based on any stats - just my own experience.
One pound of wood yields 7800 BTUs of heat. One pound of soft coal around 8800 BTUs. One pound of hard coal around 12,700 BTUs.
A full cord of dry soft maple weighs 3000 lbs. and yields around 19,000,000 BTUs of heat.
A full cord of dry red oak weighs 3700 lbs. and yields around 24,000,000 BTUs of heat.
A full cord of dry hickory weighs 4300 lbs. and yields around 28,000,000 BTUs of heat.
In my area, a full cord of firewood right now costs around $220.
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Today's Featured Article - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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