I used to go through the same sort of volume at my last cafe and we wen't through a number of machines as the build quality of the boiler especially takes a hammering when you are putting out this many coffees I had an expobar G10 multiple boiler machine which started off making great coffee but clearly wasn't performing so well 12 month later I recommend splitting the workload up between several machines, likewise have a couple of grinders on high rotation to spread the flow / and to keep them from running hot Cheers, ACg