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coolant will boil between 223 and 235 depending on ratio to water and system pressure. The coolant will boil more readily at lower pressures ie the cap fails or a hose fails. My car will peak at 198 which I think is where the fan cuts in. I think mine draws up to 30 to 40 amps easily a couple of horse power.
The bigest risk is the moment of cooling system failure and the amount of time you have to get things shutdown. The hotter you run the less time you have to react.
If you are running at 230 and the cap or hose fails it is nearly guaranteed that your coolant will boil adjacent to the cylinder wall causing damage.
my personal limit would be the moment that the radiator fan cuts in. A warmer engine saves fuel, but a radiator fan will burn fuel....
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