Not really sure why folks are saying 400 sf isn't worth heating with wood, since you already have the pipe in place. Maybe saving lots of money makes sense, but saving only a little does not?
It really depends on whether you like the toasty hot-heat of a wood stove and how cheap you are with the non-wood heat. Personally, I like the feel of wood heat and like to be HOT in the winter and I like to NOT spend money on oil or electricity, so putting in a small stove would be a no-brainer for me (unless the room was super-well-insulated). I'd be on craigslist seeing what's out there... it's not unusual for people to be cheaply selling good-condition smaller stoves like little Jotuls (whether newer or older) in order to upgrade to whole-house heaters.
It really depends on whether you like the toasty hot-heat of a wood stove and how cheap you are with the non-wood heat. Personally, I like the feel of wood heat and like to be HOT in the winter and I like to NOT spend money on oil or electricity, so putting in a small stove would be a no-brainer for me (unless the room was super-well-insulated). I'd be on craigslist seeing what's out there... it's not unusual for people to be cheaply selling good-condition smaller stoves like little Jotuls (whether newer or older) in order to upgrade to whole-house heaters.