On Mon, 20 Mar 2017 18:34:01 +0000, Chris Hogg wrote:


Solid-fuel ones are best fueled with anthracite, as you say.
Anthracite is a very low-ash coal, almost pure carbon
https://en.wikipedia.org/wiki/Anthracite . It may also be called
'steam coal', as it was extensively used in steam locomotives

Steam coal is softer than anthracite and a little less in calorific
value, often regarded as the next grade down. Our coal merchant still
stocks some as well as anthracite as there are quite a large number
of Traction engine and Steam roller owners around here.

G.Harman