I've been looking at stoves. I stayed with a friend on the continent - much colder winters than here (although similar to our cold spells!) and was impressed at how little fuel they added to the stove over the course of an evening. Something like 4 -5 logs. My own open fire would use fire-log, coal, briquettes. Anyway, yes sticking out is better but dunno how much difference it makes. I think 8 kw is normal, but they say if you get a bigger one, you can heat the house with it by leaving doors open. I'm just hesitating at the initial cost to tear out the present fireplace and buy stove and re-do the fireplace and put up a new flue......any comments or suggestions welcome!