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Where installed, demand recirculation water systems shall have controls that start the pump upon receiving a signal from the action of a user of a fixture or appliance, sensing the presence of a user of a fixture or sensing the flow of hot or tempered water to a fixture fitting or appliance.

Related Code Sections

R403.5.2 [RE] Residential Energy Efficiency, Demand Recirculation Systems
through a cold water supply pipe shall be a demand recirculation water system. Pumps shall have controls that comply with both of the following: The ...