What components are included in thermal protection for a water system?

Thermal protection in a water system is crucial for maintaining safety and efficiency. The correct components involved include an expansion tank and a pressure relief valve. The expansion tank plays a critical role by accommodating the increase in water volume that occurs when water is heated, thereby preventing excessive pressure buildup in the system. Without this component, high pressure could lead to leaks or even rupture.

Similarly, the pressure relief valve is essential for safety. It is designed to release pressure from the system when it exceeds a predetermined limit. This helps to prevent damage to the water heater or other parts of the system due to overpressure conditions.

Together, these components work to manage the thermal dynamics of the system, ensuring that pressure and temperature stay within safe operating limits, which is vital for both preventing physical damage and ensuring the safety of the users. Other options may include desirable components for a water system, but they do not specifically pertain to thermal protection.