Hey Mark, i’ve been given some 5″ flue, so ideally i’ll be using that although most stuff over 8kw seems to be 6″. 🙄
Really its a case of the bigger the better as the stove will be in the kitchen which is about 27′ x 14′, there is a door then into the lounge which sides onto the kitchen giving an area of about 28′ x 28’ish. I’m hoping to heat the whole area.
Hearth wise i’ve got a 3″ thick 30″ x 36″ slate slab 😀