Personally I would not buy a boat without some sort of central heating. As a leisure boater I have to leave my boat
several weeks a time, and when I can get back to it a few times during the winter, I do want to be able to just switch the
heating on to get the chill off the air. I've usually got lots of little jobs to do, and don't want to be faffing around
with logs, coal, paper etc to get a fire going, and then having to clean it all out again a few hours later.
It could be very different for a liveaboard though, who is generally always there to maintain a decent fire permanently.
So maybe not too much of a problem selling without c/h, but might rreduce your market somewhat.
Anyway, best of luck with your plans.
Brian