On 11/03/2021 20:21, newshound wrote:
because damp wood steals heat by sending water vapour up the chimney

Yeah, but drying damp wood in your house also steals the heat...

(today cursing my log supplier. I stacked them in the garage, I thought
they were a bit damp. Today I moved them to the new log store, and found
that the ply wall of the garage was mouldy. The meter says it is 23%
moisture )

Andy