You probably could have gotten away with a smaller amperage. As mentioned, you won't be running all the electric equipment at the same time. Heating element pulls max of about 35 amps, and there's no voltage spike on startup with a resistor. Then again I did my calculation with 240vac, not 220. Electrically it's all interchangeable lingo, but obviously it can fluctuate value.
BUT... Having all that extra amperage allows for a lot of future expansion of any toy you want to add (brewing or otherwise).