Much of the bituminous coal has more btu's/#,but to utilize it you have to be able to
burn the volatiles where a lot of heat is. Many have the misunderstanding that anthracite
has more btu's ,there are some bituminous coals with mid 15,000 btu's/#,there is no
anthracite with this high of heat value.The long chain hydrocarbons have a very high
heat value ie (diesel and gasoline) and they take higher amount of oxygen to release the
internal energy.Some coals also contain a large amount of gases(oxygen & nitrogen)
which reduce the heat value of the fuel. A lot of variations of coal are available and each
is little different in its composition so has its own burning characteristics,many members
on this forum express these in how one fuel burns better in their particular appliance.
Anthracite is more uniform in that it is mostly carbon with few volatiles and not much
else to produce heat.Many of the thousands of volatiles in coal have a much higher heat
value than carbon alone,but burn in a different way so a heating device has to be designed
to burn that type of fuel.