What Is a Thermostatic Mixing Valve?
A Thermostatic Mixing Valve is a temperature-control device that blends hot and cold water before water reaches a fixture. The valve senses the mixed water temperature and adjusts the flow when conditions change. This helps a water heater supply hot water while the tap receives a steadier, controlled temperature.
Quick Facts About Thermostatic Mixing Valve
Category
Water temperature control valve
Used for
Blending hot and cold water
Common confusion
Different from a pressure balancing valve
Also called
TMV, Thermostatic tempering valve
Often discussed with
Water Heater Installation
Key Takeaways About Thermostatic Mixing Valve
- It responds to changes in water temperature.
- The valve serves fixtures supplied by a water heater.
- It isn't the same as a pressure balancing valve.
How Thermostatic Mixing Valve Works
A Thermostatic Mixing Valve combines hot water from the heater with cold water from the supply. A sensing element responds to the mixed water temperature. The element changes the hot and cold water flow as the temperature shifts.
Related glossary terms: Pressure Balancing Valve, Expansion Tank, Pressure Reducing Valve.
The valve's outlet supplies tempered water to a fixture or a group of fixtures. A setting controls the target temperature, while the valve keeps adjusting the blend during use. A pressure balancing valve reacts mainly to pressure changes, so it serves a different purpose.
During water heater installation, the valve connects to the hot and cold water lines. The installer checks the connections, the direction of flow, and the outlet temperature. These checks help confirm that the valve works with the water heater and connected piping.
Expert Note
When we install a water heater, we check whether a thermostatic mixing valve fits the system design. We inspect the hot and cold connections, confirm the flow direction, and check the mixed-water outlet. Our team also looks for signs that the valve needs cleaning or adjustment.
Thermostatic Mixing Valve in Practice: A Real-World Example
During a water heater installation, a thermostatic mixing valve may connect the heater's hot outlet with the home's cold supply. The mixed outlet then sends controlled-temperature water toward the fixtures.
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Related Terms
Pressure Balancing Valve
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Expansion Tank
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Pressure Reducing Valve
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