Over the last few years we have burned Kimmel's anthracite 90% of the time because of the price and distance to pick up (eight miles)
. The ash content has always been high with a red iron color. The good heat output and quick response to a draft change has been much the same over this time.
The Three Jotul 507s that we are heating with on average, in the cold temps, take about 75-80 cranks of the shaker handle to shake the stove- three times a day with the Red Ash Kimmel's.
Now with the light gray/tan ash Kimmel's, the coal and bags are much cleaner with much fewer fines.
The ash content is almost half of the red ash Kimmels. Our Jotuls only need about 45-50 cranks to shake down.
We may be able to shake only twice a day at this point.
With the gray/tan ash, the heat output is good but the coal needs a bit more draft air and is slower to respond to a draft change. Also the burn time has gone up about three hours per load....
Has anyone else seen this with Kimmel's??