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.
Thermostatic control valve water heater.
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Water heater problems that may be caused by the gas control valve include a faulty hot water heater thermostat faulty gas valve pilot light that won t light and tripped heat limiter here s what you need to know about replacing your water heater s gas control valve.
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.
The advantage with thermostatic valves is the direct control over output temperature.
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.
The control of water temperature for the source of supply should be controlled by asse 1017 listed mixing valves.
Turn off the shutoff valve at the cold water line that attaches at the top of the tank.