Firewood info hope it helps

[Eagle]

The calorific values of almost all woods match each other when oven dried (all the moisture has been driven off). In other words if you take heart or sap wood from oven dried oak, beech, poplar, or even balsa wood the calorific values are very similar on a weight for weight basis.

 

Obviously its not like this when you chuck a log with 20% moisture on the fire, but it helps to explain to customers who say I only want beech or ash or strangely even some think soft wood is the best. We have to sell it on a cubic metre basis, not on weight, so the heavier the cube is the better when it is actually seasoned properly!