i think i have read 100's of forums on this subject and still no clear answer. i just ordered a MM211 and i have a craftsman storm responder' it runs a steady 5500 W and surges to like 8000 or so. i think this will run the 211 just fine' might be lacking a little heat on the 240 setting ???? the welding supply store told me it will run it just fine but after reading some of these forums i have some doubts now. i'm building a shop with it so there is no power besides generator. will be using 3'' pipe and 6'' cee purlin. any comments or suggestions would be much appreciated. thanks