What comes to sub zero Celsius operation, there is no waterfree
"black magic" available.
Effective charcoal gasification needs its water to produce hydrogen and wood has it “inboards” already, without freezing problems.
Thats the starting point. “Charcoal water” you have to keep in the house and fill up for each and every trip if you do not have a warm garage.
With wood, it’s the opposite; draining at close-down. (and intermittently)
When you plan a winter woodgas system, a “royal” thought is to keep in mind the heating–cooling–heating which is unevitable to avoid freezing and plugging.
That is: You cannot go out from the gasifier in an uninterrupted chain, always
further and further away from the gasifier with each added component!
No, you have to come back for reheating more or less to keep the components either just warm or (for called upon) real re-heating for the cleaning process!
That takes good planning, as each (cleaning) component needs to be easily emptied from soot.
This means, that a gasifier cannot be crammed alone in a norrow corner; service availability to do the daily emptyings of soot and condense has to be a “clean hand” job as far as possible.
Proud and happy driver!