It would help a lot to know what kind of boiler you have. There are huge differences between brands and the efficiency of different models.
I rarely measure my wood in cords, however I know thats more common in the north, around here we go by the truck load lol.
Last year I heated 22-2300 sq ft on 9 full truck loads of wood and about 1500 lb of coal. Coal was experimental.
I just got my CB 6048 running a week ago. Seems to be doing a really good job so far, but it is not cold yet. I will be heating about 2500sqft of house plus my DHW, 1000sqft of house to 88F, as well as the 25K gal pool inside it. I think the pool water uses about 500K BTUs/day based off the propane heater usage last year.
I plan to run the furnace from Oct thru April/May to support the pool water/room mainly. By then it should be warm enough to use solar supplemented with a little propane/electric.
Any idea on how much wood that would take? I was thinking 10 cords, or about a cord a month. Pipes are all insulated and my climate is fair. It rarely gets below 0F, typically hangs in aroung the 20s for the winter season.