Mar 3, 2016 ... The gross average heat value of a cord of dry hard wood (4 ft. x 8 ft. x 16 in.) is
estimated at 2,700 kWh. The efficiency of wood heating devices varies greatly (
from 40% to 70%); the efficiency of a standard slow-burning wood stove is about
55%. That means that combustion of a complete cord of wood would ...
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