Green Plumbing

Answer: D - Joint leakage is not a historical problem with recirculating hot water systems. Such systems have led to wasted energy due to continuous heating and movement of hot water through the pipes. They have also contributed to pipe corrosion, particularly at angles in the pipes, courtesy of their higher flow velocities; smaller pumps and minimizing angles can help. The small motors on some hot water recirculation pumps often create insufficient head pressure, and thus affect flow rate.