John, You can use the point of use mixing valve with a small heater set to 140F as long as the hot water supply coming to the fixture is also set to an elevated temperature. The point of use valve is designed to mix the hot water temperature down at the fixture. If the main central hot water heater temperature is not elevated once that water gets to the mixing valve the valve will drop the temperature.
John, You can use the point of use mixing valve with a small heater set to 140F as long as the hot water supply coming to the fixture is also set to an elevated temperature. The point of use valve is designed to mix the hot water temperature down at the fixture. If the main central hot water heater temperature is not elevated once that water gets to the mixing valve the valve will drop the temperature.