Just remember, ash content is determined under laboratory conditions. An idling stoker is not the lab, and it is possible to have high quality coal that doesn't behave well in a stoker that isn't being worked. I have had ultra hard coal that burned fantastic in the heating season, but when the boiler was just loafing along I got a lot of partially burned coal in the ashes and the fire tried to out if the timer wasn't set just right.
tsb wrote:I think kimmels is mostly southern range coal. It will burn with lots of flame and heat.
Yes, and that has been my experience as well. Coal from the Western side of the Southern Field seems to have a little higher volatile content...starts easy, burns hot & thoroughly. My EFM has held a fire for 12 hours without Kimmel's rice when I forgot to turn the power back on after an adjustment.