Your Hobart dishwasher must be a door type with your usage. You don’t mention the KW or BTU of the booster heater which really matters when you are trying to figure these things out. Also you don’t mention how many meals are served per period. Also the term rise means the difference between incoming water temp and the heaters set point. A 100 degrees rise in temp to accomplish 130 degrees would mean your incoming water temp is below freezing.