Danny, not sure I would test that high a pressure. The coolant pressure won't be as high as your domestic water pressure. You could pressurize the tank with fresh water and test the bypass loop by opening the loop caps if they are capped. If the loop leaks it can be easily repaired. But that doesn't deal with the original issue of a tripping breaker! Perhaps the element is burned or shorted. Maybe the tank is leaking on the thermostat? Lots of things to look at. Good luck, Len
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