It's also possible the temperature thermostat is set too high for the amount of time/quantity it's used causing it to overheat too much and open the relief value often. That is too much water being released for normal operation.
I've rarely tested the valve and I've had many over the years and can't even remember having an overflow problem. I've only changed the valve when a new hot water is installed and came with one. I used to have rental houses also that I did all the servicing on. Maybe just lucky.
As Opus stated, nothing to replacing them unless they're soldered in place to the copper pipe. Home Depot and Lowes can show you how.
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