We took on a house in the Highlands with a Dunsley Highlander 7. The backboiler heats the water (if given most of the day and a medium sized tree to burn) and the remainder of the heat goes to the living room.
I've had wood burning stoves for years, run a sawmill, burn plenty of wood and process a great deal more. You can give it as much tinder dry firewood and time as you like, it will never reach the temperature zone of best operation (as indicated by the flue thermometer). It barely functions as a room heater, so it is being ripped out next week and replaced with something bigger and far better.