Hi there,
First, some historical notes.
There is a captain in Russia, Evgeniy Gvozdev, who made one single-handed circumnavigation in a 5.5 m sail boat – micro class racing boat.
Few years later he built a boat 3.6 m long in his apartment building kitchen, brought her down through the window and circumnavigated single-handed again.
Today, 4 years after his return he plans to go third time on a boat which should be 3m long. The boat now is under design. Going though the Roaring 40es is one of the options.
The question for today is – what type of heating device can be used on a boat this small?
It should not use electricity, should not consume oxygen from the cabin, and, ideally, should not use any
fuel. Granted, it should be tiny.
If you want to know more about captain Gvozdev, here is his website:
://gvozdev.iwt.ru
It is in Russian but I can post some material here in English.
He is now finalizing a book about his adventures. It will be published in Russian some time in the future.
Alexei