Which component is primarily responsible for maintaining stable water pressure during temperature changes?

The thermal expansion tank plays a crucial role in maintaining stable water pressure during temperature changes, particularly in closed plumbing systems. When water is heated, it expands, and this expansion can lead to increased pressure within the system. If too much pressure builds up, it can cause damage to pipes or fixtures, or trigger pressure relief systems.

The thermal expansion tank absorbs this excess pressure by providing an additional space for the expanding water, effectively maintaining a stable pressure within the system. This prevents potential leaks or failures that could occur due to the elevated pressure.

In contrast, while pressure relief valves are designed to release pressure when it exceeds a certain threshold, they do not actively manage pressure changes due to temperature variations. Circulation pumps help move water through the system but do not directly influence pressure stability. Pressure reducing valves function to limit the maximum pressure in a system but do not specifically address fluctuations caused by thermal expansion.