Hi Grovenburg
Let me apologize for Guido. He has a real pet peeve about using the "F" word on this site (facecord), and he's not usually polite about it when he brings it up.
When you hear other homeowners talk about how much wood they burn for indoor wood burning stoves, etc., they like to talk in facecords because they burn smaller amounts. They're probably referring to facecords in terms of 1/3 of a full cord, but the fact is it's not really a precise measurement - even though I'm willing to bet that 99% of the people who use the word think of it in terms of 1/3 of a cord. For example, when I bought our house in March (outdoor wood burner came with it), the homeowner said "you'll burn about a facecord a week". Who knows what he meant by that since most of the pieces going in the furnace are longer than 16inches, but I assumed he was referring to 1/3 of a full cord, give or take. I've layed up 16 full cords for this year hoping I don't go through all of it so I don't have to start from scratch all over again next spring. Based on what I saw for the few weeks I ran mine last Spring, my assumption is that 1/3 of a cord per week should do it, a little less early in the season, a little more during deep winter. Mine is a Mahoning, just a straight burner, heats a 4 car garage and supplements a gas boiler in a 2600 square foot farmhouse.