Anthracite is recommended, but the Harman Mark stoves do a good job with bituminous coal as well as with wood
I've been wondering about going strictly wood when it gets cool instead of COLD (I've got about 3 cords from an old maple that needs to burn sometime..) Harman forbids anything other than coal (except when lighting). But they also forbid MPDs and we know some folks have those attached to them.
Obviously Harman likes the CYA approach, they're big on 'forbiding'. So my post goes toward the discussion of why not wood? If it is well seasoned, the brick-lined burn chamber looks like it wood be fine for wood (though my Mk1 would mean small logs). Is there mainly a concern if you burn wood for a while, and then switch back to coal could cause creosote fire issues? Just curious on peoples experince burning wood in these appliances. Thanks, Trey