I have a farmer buddy that heats his uninsulated farmhouse and a Quonset shop and his milk house water with a keystoker. He is in Caroline near Ithaca and if you wanted to see it I can arrange it. Seems to me if you went with a refurbed efm 700 or maybe 900 you couldn't go far wrong. Sees like Ive seen a few advertised here for reasonable money.... So the answer to your question is yes you could and should(imo) wood sucks the life outa ya and if your burning one of those outdoor units your screwing yourself and that's not an opinion!
Buy a stoker and put up a small building w/ coal storage right where your current wood burning contraption is and you'll be on easy street
Pm me if you want to see my buddies operation.