Get a 220 volt Mig and GET A BOTTLE, even a Small bottle.
You'll be Much Happier.
A small Lincoln Electric Weld Pak 180 should do Nicely for restorations of Soda Machines.
Get a Name Brand, down the road you want to be able to get parts if needed.
Either the Lincoln or the Miller 220V mig machines are the way to go. I wouldn't even waste my time with anything less. You will not be able to get parts and consumables for the HF brand stuff. They are much cheaper, but you get what you pay for. I have the Miller 180 and it is awesome. After using shield gas, you will never want the flux wire again either.