On 19 Feb, 17:27, "Mr Sandman"
wrote:
It strikes me that if we could extract more heat from the flue and attach a
fan like one you'd see on a fan assisted boiler, we get even better heat
output where its wanted and not up the chimeny. *Ive not seen anything on
the market that does this...so do you think it'd be worth experimenting
with?

Steve

Don't forget the tars which will condense out of the flue gases and
stick to the liner until such time as they ignite. Burning wood often
results in chimney fires