The water leak is located on the third floor in the mechanical room between the two hydronic water heaters on the recirculation pump. On the ground level there is an electrical room with multiple breaker panels. The breaker panel with the label that says house panel is the electrical box that house is the power for that mechanical room. It is labeled circulating pump and is number 25. That breaker also turned the power off to the two water heaters. I confirm that the power was off to the pump before disconnecting the wires. I turned the water off by isolating both sides of the pump. I then cut the pump out and began the fabrication of the new pipe supports and that will suspend the new pump so it doesn’t ride on the other water lines under it. With a supports in place I then ran the new pipe through the supports and hung the new pump. Checked for leaks after turning on the water and then double checked for leaks. After the pump there I installed a bleeding valve to purge the recircul