Which of the following best describes the function of an auto bypass valve in a hot water system?

The function of an auto bypass valve in a hot water system primarily involves allowing for the expansion and contraction of water. As hot water is heated, it expands, which can increase the pressure within pipes. The auto bypass valve is designed to respond to these changes in pressure automatically, providing a pathway for water to flow back into the system, thereby accommodating the expansion without causing undue stress or damage to the system.

In scenarios where water cools, it contracts, and the valve continues to play a vital role by ensuring that pressure levels remain balanced within the hot water system. This prevents potential issues such as pipe bursts or leaks that could occur from excessive pressure buildup. The design and functionality of an auto bypass valve are crucial for maintaining the overall integrity and efficiency of a hot water system, particularly in managing the impacts of thermal expansion.