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Shower and tub-shower combination valves shall be either balanced pressure, thermostatic or combination mixing valves that conform to the requirements of ASSE 1017 or CSA CAN/CSA-B 125. Such valves shall be equipped with handle position stops that are field adjusted in accordance with the manufacturer's instructions to a maximum hot water setting of 120°F (495°C).
Exception: Balanced pressure, thermostatic or combination mixing valves shall not be required for showers and tub-shower combinations in multiple showers supplied with a single tempered water supply, provided the hot water supply for such showers is controlled by an approved master thermostatic mixing valve adjusted in accordance with the manufacturer's instructions to a maximum hot water setting of 120°F (495°C). Such master thermostatic mixing valves shall be sized according to the peak demand of fixtures located downstream of the valve and shall comply with ASSE 1017. The water heater thermostat shall not be used as the temperature-control device for compliance with this section.