Pride Plumbing was called out to investigate why the customer was not getting enough hot water from her two tankless water heaters. Our tests and inspection determined that the cause of the issue was the bathtub/shower's downspout. It was dumping water out at a very high volume and exceeding the water heaters' ability to keep up. We adjusted the temperatures of the water heaters, and they were able to maintain hot water at 124-127 degrees for 15 minutes from the sprayer head.