"The Natural Philosopher" wrote in message
...

I burn lots of coniferous stuff. builidng wopod scraps, douglas fir, scots
pine, odd bits of spruce. once dry its not the worst spitter in the world
by a long chalk. Willow and polar just as bad if not worse.

Yes - I have had trouble with polar as well.
Not a lot of heat comes out in my experience (:-(

Regards
Pete (:-)