The next system will be able to hold 56 pounds grain with 25 gallon volumes in all three keggles should I want to have a one large stout brew day hence the high wattages posted. Granted if doing a 5 gallon batch the heating will be rather quick also but then each keggle will have two 5.5KW elements, I can heat up with only 5.5KW for slow or 11KW then switch and maintain temps with one 5.5KW element using the BCS 460 controller. I'm allowing myself these options plus not having those long heating times i've read on this forum over the years.
With a 60 amp dedicated brewing breaker, 2/4 SOOW cord on down to 12/3 in storage in 200' lengths feeding the elements or brewery system isn't a problem, slow heating times are to me, been there. I learned from past brew rig building mistakes on my part following advice and opinions hence going with my own wants, desires and needs.