Multifuel Stove

[skyplus]

How important is vermiculite around a flexible flue? I am not getting great heat from my stove, and I wonder if the absence of vermiculite could be the reason?


Any advice appreciated. Thank you all in advance

[Buenchico]

I'm out of my depth here but this looks like it might be relevant:
http://www.stovefittersmanual.co.uk/articles/should-i-insulate-my-chimney-flue-liner/