Most important is that stove & flue joints are sealed. Air goes in to feed the fire but the fumes all go up the flue. Dunno if the op is still reading this but thats the basics. There seem to be plenty of suitable wood burners available for a reasonable price. Traveller/showman's 'vans from the days of yore usually had solid fuel stoves fitted.
A lot of canal boats have solid fuel stoves fitted. Have a wander down your nearest towpath and see how they do it.
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I lived on a 70 foot Narrowboat for several years and through 2 winters when the canal froze hard enough to slide the coal bags from one side of the cut to another.
I fitted a little Torgem fire with a back boiler. The flue was a cast iron 1 Piece beastie, very heavy..
That little heater, with a 3 inch water pipe running from it to the far end of the boat and back with a small header tank heated the entire boat, mostly on logs we pulled out of the lock overflow. We would light it on coal to get the heat up quick then it would just run on wood all day, usually with a large pot of Ox Tail soup bubbling away. I always suspected that the majority of the heat came off the chimney which was blisteringly hot.
I have only 2 weeks ago fitted a Gas bottle wood burner bought from Ebay in my garage to keep me warm when I'm pootling around in it. Using wood it got from -1 to +20 in just over an hour.
I would suggest that, if the OP had a decent fresh air inlet to the unit there wouldnt be a problem. The big problem as I see it would be that it would get just too hot. People dont realise just how much heat these small woodburners will throw out.
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