We’ve got a 7kW burner going right now. Some of our walls are stupidly thin - wattle and daub only a few inches thick, quite a bit of single layer of brick, lots of draughty windows, some bits made of witchert.
wattle and daub
There's your problem, you're living in a Viking longhouse. I recommend upgrading to something post 1700.
@Sumo started
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We’ve got a 7kW burner going right now. Some of our walls are stupidly thin - wattle and daub only a few inches thick, quite a bit of single layer of brick, lots of draughty windows, some bits made of witchert.