lsayre wrote:
I wonder why and how Harmony coal got to be all the rage, as it is very red ash.
Because it burns well especially if you don't push the temps too high, having said that I've seen some people I've delivered too in the past with some pretty nasty clinkers as in softball size that were getting their coal "down south".
Just to add in general the white ash is going to have less ash content but you have to be careful it doesn't get too low because then you get into the territory it starts being problematic in stokers and not burning...