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An expansion tank shall be installed on all water heaters where the water main pressure is greater than ------- psig.

a. 125
b. 120
c. 80
d. 100

Answer :

Final Answer:

An expansion tank shall be installed on all water heaters where the water main pressure is greater than 80 psig.

Correct option: c) 80

Explanation:

The correct option is c) 80. An expansion tank is necessary to accommodate the expansion of water within a closed plumbing system, especially when the water main pressure exceeds a certain threshold. When the water main pressure surpasses 80 pounds per square inch gauge (psig), there's a higher risk of excessive pressure buildup within the water heater and plumbing system. This can lead to various issues such as water hammer, leaks, or damage to the water heater. Therefore, to prevent these problems and ensure the safe and efficient operation of the water heater, an expansion tank must be installed when the water main pressure exceeds 80 psig.

Options a) 125, b) 120, and d) 100 are incorrect as they either overestimate or underestimate the threshold pressure at which an expansion tank is required. Adhering to the recommended pressure threshold for installation of an expansion tank helps maintain the integrity and functionality of the plumbing system, reducing the risk of damage and ensuring optimal performance of the water heater. Thus, the correct option is c) 80.

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