I'm in the process of buying a couple of multifuel burners for our two
downstairs rooms and need to work out what heat output I should be looking
for (in KW).

The main problem is getting a reasonable u-Value for wattle and daub. Once
you've got that, the calculation is simple. Anyone like to suggest one? To
me, it sounds like it would insulate better than brick.

Also, is the room draughty? Presumably small windows? Are they well fitting?
How many outside walls in each room?

Christian.