Why does the hot water in the shower last for only one minutes?

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When our water recirulator is running, the hot water in the shower only lasts a minute before it turns cold. If I turn off the tap for minute and then turn it on again, I get hot water again for a short bit and then it turns cold. I don’t have this issue on any of the other faucets or showers. Without the recirculator pump running, we barely get hot water anywhere on the top floor of the house.


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