Well in your location, with a lot of family muscle to help, a wood boiler may be the best for you..
The idea of tossing large quatities of wood into a large firebox, and let it smolder and cook at low temps, coating the inside of the boiler with creosote.. just makes me shudder... But I suppose if you have lots of free wood, and I mean LOTS of wood, and can get the family to participate in the yearly process of cutting, splitting, stacking, then the daily process of unstacking, and loading the firebox... I'ts this process that is so much work, that makes most people love coal...
You are not going to get too many more OWB -bashing stories on here,, there aren't that many folks who had OWBs... I can think of less than 6 members that are former OWB owners..
Here is a thread that is developing: Anybody Using Hawken or Global Hydronics HE-4000?
He has an OWB, maybe he can pass on some info??
Take a look at the inside of his OWB,, all that black goop is unburnt wood, gassified, then liquified.. insulating the inside of the boiler.. Not good..