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Some have a wax insert that contract and expands in response to the water temperatures. Other more modern valves have thermostats that read and respond to temperatures.

But when it comes to a pressure-balancing mixing valve, there is a major setback in the way it adjusts your water temperature.

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One touch to the right and you’re blasted with cold water. One tap to the left and scalding hot water has you hugging the shower wall.

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Thermostatic mixing valves typically offer two handles: one to control the water flow (pressure) of water and one to control the water temperature.

Pressure-balancing valves don’t directly control the temperature of your shower water. In fact, they can’t even sense the temperature. Think of them as simply adjusting the ratio of cold to hot water pressure.

So, if you have a single-control lever, your morning shower routine likely starts with a time-consuming, lever-fidgeting guessing game to find a comfortable ratio of cold to hot water.

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For example, in the picture below, the movement of the lever simply changes the ratio of hot to cold water. There is no measurement of temperature, just a mechanical balancing act of hot water mixed with cold water.

Note: The one drawback of a thermostatic mixing valve is price. They are more expensive than pressure-balancing valves because they offer more advanced features.

And that makes for dangerous scalding temperatures. But it also creates a huge temperature range for you to navigate and makes it difficult to find the “perfect” shower temperature.

This valve works similarly to a pressure-balancing valve in that it blends hot and cold water but it actually senses the temperature of the water and controls it directly for more precise shower temperatures.

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A mixing valve is installed into your shower faucet and blends hot and cold water together to deliver comfortable showering temperatures.

Basically, the hot water coming out of your showerhead has the potential to get as hot as the water stored in your water heater if the lever is pushed as far left as possible.

While pressure-balancing valves can set a maximum temperature limit, this is basically just a mechanical “stopper” that stops your lever from rotating at a certain point.

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We’ll discuss the differences between the two and why switching to a thermostatic mixing valve gives you better control over your shower temperature.

Because you have a faucet dedicated to just water temperature, you can find the “sweet spot” and leave the lever in this position from shower to shower. Just adjust the water flow lever and voila: the perfect shower temperature, every time.