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Why does the shower water temperature fluctuate when the toilet is flushed?

April 26, 2017fluctuate flushed shower temperature toilet water

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Why does the shower water temperature fluctuate when the toilet is flushed?

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Usually this is caused by one of two things: old pipes or pipe design. When there is more demand to the cold water system, you lose regulation of the temperature and pressure. Today’s plumbing code requires a pressure differential valve for the shower.