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HJ, That's exactly what I thought, but the plumber said the check valves are fine. Also, in addition to the check valves, there are shut off valves on both sides of the pump on the return line. Closing those valves should prevent any backflow, but it didn't make a difference. Any ideas...

HJ/Gary, Thanks for your replies, but I think I may have been a bit unclear. There is a return line from the kitchen and the hot water works fine when the recirculation pump is turned ON. My question was why just a few faucets take an extremely long time (5-7 minutes) for hot water when the...

Hello, We have dual water heaters (parallel) in the basement with a separate hot water return line and a recirculation pump. When the pump is on, there is instant hot water and everything works fine. When the pump is off, there is an acceptable delay of 30-60 seconds on most faucets in the...