Plumber Red Seal · Question
Which of the following describes the primary function of a thermal expansion tank in a closed hydronic heating system?
A thermal expansion tank is designed to accommodate the expansion of water when it is heated in a closed system, thereby preventing excessive pressure buildup a
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Question: Which of the following describes the primary function of a thermal expansion tank in a closed hydronic heating system?
Answer options: ✅ To absorb the increase in water volume as it heats up, maintaining stable system pressure.
- To provide a continuous supply of fresh water to the system.
- To filter impurities from the circulating system water.
- To prevent backflow into the potable water supply.
Correct answer: To absorb the increase in water volume as it heats up, maintaining stable system pressure.
Explanation: A thermal expansion tank is designed to accommodate the expansion of water when it is heated in a closed system, thereby preventing excessive pressure buildup and maintaining system stability. It does not supply fresh water, filter impurities, or prevent backflow; those are functions of other components like automatic fill valves, strainers, and backflow preventers, respectively.
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