Plumber Red Seal · Question
A plumber is installing a potable water expansion tank in a closed-loop domestic hot water system. What is the primary function of this expansion tank?
Expansion tanks are crucial in closed-loop systems to absorb the increased volume of water as it heats up, preventing dangerously high pressures. They do not in
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Question: A plumber is installing a potable water expansion tank in a closed-loop domestic hot water system. What is the primary function of this expansion tank?
Answer options: ✅ To prevent excessive pressure build-up due to thermal expansion of water.
- To increase the overall volume of hot water available in the system.
- To filter sediment from the hot water supply.
- To reduce the operating temperature of the water heater.
Correct answer: To prevent excessive pressure build-up due to thermal expansion of water.
Explanation: Expansion tanks are crucial in closed-loop systems to absorb the increased volume of water as it heats up, preventing dangerously high pressures. They do not increase hot water volume, filter water, or reduce heater temperature.
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