[quote="NEPAForum Admin That's not anthracite though, there's a huge difference. Depending on the quality of the soft coal you purchased anthracite could be as much as double the BTU's per ton.
I haven't found a source to support that. The source below also shows the various btu's of anthracite which also can be lower than soft coal.
This link is broken, either the page no longer exists or there is some other issue like a typo.