[my 2 cents]
I was in the same situation as you 3 years ago. I bought a Harman Magnum Stoker to heat my house. It's a well insulated RR and the stove is in the unfinished basement with no insulation in ceiling. ~1100 sq ft upstairs and 800 sq ft downstairs.
I found my basement was a SAUNA and my upstairs was barely warm. I cut a couple of vents in and ran ductwork from the stove to the 2 vents. This helped a lot, but I'm still not happy. LSFARM mentioned that I need to cut a return vent at the opposite end of the house and run that return duct into the inlet on distribution blower on the stove. I never did it b/c I decided I need a stoker boiler instead.
I also have a hot water coil installed in my stoker and I do get some hot water from it as well.
Long story short, after reading on this forum I realized I should have bought a Stoker boiler instead of a stoker stove. This way my house will be heated and my domestic water will all come from coal.
NO OIL BILL!!!!
I will be installing a boiler this summer and selling my Magnum stoker.
I will be selling my Magnum stoker this summer if you still decide to go with the stoker stove