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Can a hot water circulation pump causing whining noises in the plumbing system?

April 26, 2017causing circulation hot noises plumbing pump system water whining

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Can a hot water circulation pump causing whining noises in the plumbing system?

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I recently installed a hot water circulation pump and now get occasional whininf noise in the pipes, usually when flushing the toilets. There is also a expansion tank on the system and I have PEX supply lines.