Joe T has a point...it is his opinion that the NEC requires a 120v laundry circuit, even if the unit is 240v.
I agree with his reading of the code...I'm not sure I'd apply it. Heck, I recently saw some apartments that had added stack washer/dryer units to the kitchens...darned if I can sort out all the code issues that brings up!
As for the load calculations....as I see it, you'll have to do the square foot calc, and then add the known load of the appliance.
