[sitharus]

Dried wood suitable for burning is around 20% water at most, else it won't burn with much heat. It can go down to around 6% IIRC for kiln-dried wood suitable for construction.

[jjoonathan]

Boiling water costs a helluva lot of energy. Do these engines recover that energy?

[jabl]

How would they work if they didn't?

[jjoonathan]

At low efficiency.