I recently discovered some heaters based on "bio fuel" (ethanol).
Many products seem to be decorative and often present a modern design.
Some ethanol burners can be used in empty fireplaces and can deliver some moderate heating power.
It seems also that the emissions are very low, and there's usually no need for using a chimney.
Do you think that a solution based on ethanol can be used as a main heating source for a flat?