Why do closed hydronic systems include pressure-relief valves, expansion tanks, and temperature- and pressure-limiting devices?

A. Because freezing must be prevented and antifreeze may not be added
B. Because water expands and contracts as its temperature changes
C. Because building codes require certain controls on every system
D. Because the copper piping used in the system requires these measures

Closed hydronic systems incorporate pressure-relief valves, expansion tanks, and temperature- and pressure-limiting devices mainly because water expands and contracts as it heats and cools. These components are essential to manage pressure and maintain system safety. Therefore, the most accurate answer is option B. ;

Answered by GinnyAnswer | 2025-07-07

Closed hydronic systems include pressure-relief valves, expansion tanks, and temperature- and pressure-limiting devices mainly because water expands and contracts as its temperature changes. This expansion and contraction can create pressure fluctuations that these components help manage, ensuring the safety and efficiency of the system. Hence, the most suitable answer is option B.
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Answered by Anonymous | 2025-07-15