Although the specific assignments varied over the years, the refrig and water heater may be powered through the same breaker. When you checked the breakers, did you switch this one OFF and then back ON? When a breaker has tripped, simply pushing it back toward ON won't reset it. You must first go to OFF, and then to ON.
I'm assuming that you turned on the water heater's outside switch. This would have no effect on the refrig, of course.
Bill
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