Answer :
Final answer:
The temperature and pressure relief valve is the ultimate protective safety device installed on every water heater.
Explanation:
The ultimate protective safety device that is installed on every water heater is the temperature and pressure relief valve. This valve is designed to release excess pressure and prevent an explosion in the event that the temperature or pressure inside the water heater becomes too high. It is an important safety feature that ensures the safe operation of water heaters.
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