I never realised it was so technical. I live in the country, and we have a Clearview log burner, it’s about 5 years old now I guess, and in common with all our neighbors I think, we buy wood in bulk from the local farmer after he’s kept it in his barn for a year and chopped it up, then put it in the log store outside. In the autumn I move enough for that winter into the garage (only because I’m too lazy to go outside in the winter).
My log burner hasn’t got an adjustable grate, but it’s got two air controls on the base and on the door. It seems very efficient to me, I use about three fills of wood if it’s on for the whole day, it’s a lot cheaper than keeping the central heating on, and keeps the whole house warm, in fact too warm in the lounge so I keep the door open.
I’ve never given this any thought before, but based on what those of you who in the know are saying about the environment, are all log burners a bad thing, I really do hope not?