That is the current, smallest Willburt stoker model, the S30. They have a cut sheet of it available for download on their website.
I will say that I am absolutely sick and green with envy.
That is a $4300 stoker new from Willburt. You STOLE that thing.
I have information from Willburt I could send you on the proper installation of the stoker into a boiler to properly burn bituminous coal. Willburt would also just send it to you directly. Call them and ask for Dan.
I've been hoping to score something like that as I live in the heart of stoker coal country. If you decide you don't want it, I'll make it worth your while!