The control of water temperature for the source of supply should be controlled by asse 1017 listed mixing valves.
Thermostatic control valve water heater.
Commonly used in washdown applications these systems include a temperature regulating valve with an internal check valve and vacuum breaker to prevent backflow two ball valves for manual control of the water supply a dial thermometer that displays the outlet temperature and a hose rack for storage.
Also commonly referred to as anti scalding valves our tmvs accurately control the temperature of hot water at the source of heat water heater to deliver point of use showers sinks lavatories bath tubs etc water at safe controlled temperatures regulate water distribution and flow and provide sanitary anti scald protection.
While your water heater can be set to 140 f to protect against bacterial contamination the water coming out of your shower head can always be 100 f a maximum output temperature is set on the valve.
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Cmi inc thermostatic mixing valve with push connections 3 4 x 3 4 inch pex for hot water heater water control shower temperature regulator 64 99 64.
The advantage with thermostatic valves is the direct control over output temperature.
These valves can also be used for re circulation systems to maintain domestic hot water supply temperatures at levels temperatures above 55c 131f that prevent the growth of harmful bacteria such as legionella.
Turn the water heater thermostat control to the pilot position.