Why is the circulating pump positioned on the return leg of hot water ring main in Hot water system?

The circulating pump is positioned on the return leg of a hot water ring main to ensure efficient flow and consistent temperature throughout the system. By drawing cooler water from the return line, the pump helps maintain a continuous loop, preventing stagnation and ensuring that hot water is readily available at the outlets. This positioning also reduces the risk of overheating in the supply line and promotes optimal energy use by allowing the system to circulate heated water effectively.