HELP! Tenant calling with Surging Hot Water in the Shower problem?
Many shower faucets have a pressure balancing unit or similar that will
compensate for a difference in water pressure (flushing toilet)that
moves inside the valve. If it is failing it may not move the way it
should, causing it to not move at all to the change in pressure, or may
stick and overcompensate, stick and overcompensate in the other direction.
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