If the breaker is tripping, it's either a weak breaker or the hot water heater is pulling to many amps. Put a meter in the line and see how many amps it is pulling. That will tell you if it is the breaker or the heater.
The following 1 user Likes Sans Peur's post:1 user Likes Sans Peur's post Donaldjames (11-28-2020)