OK we live in a 13 year old house with the standard flue built into the cavity for a gas fire.

Can i get an adaptor so i can use the flue as the exhaust for a 4kw wood burner, or would i have to have an external flue fitted?

Hi, I fitted a multifuel stove in feb of this year in my house(65 years old) then a friend asked me to fit one into his 15 year old house and we used an external flue.

First thing, get someone to check your flue.

We thought we’d do the same at our last house, newish house with a fireplace and flue – guy took one look up and said, No. Apparently it might be a hole but its certainly not a flue…

Part J

http://www.planningportal.gov.uk/uploads/br/AD_J_wm.pdf

Class 1 flue only! If it was just for a gas fire itll just be a bog standard copex which ain’t good enough. Do you have a fireplace and is there a chimney up in t roof?

as above .. you need a class 1 flue ( what that looks like is a brick built chimney on the inside, if when looking up its made of cast concrete blocks or you can see a steel corrugated liner its NOT class 1)

According to part j you can use flue blocks.

Yes you can use flue blocks or standard 225 clay liners but they obviously need to be in place now!