Why Your Hot Water Heater Requires a Tempering Valve


Why Your Hot Water Heater Requires a Tempering Valve

When you stop to think about it, many of us take hot water for granted. When we turn on our hot water tap, water at the proper temperature is released almost every time, and when it isn’t, we are irritated. When you turn on the hot tap and cold water comes out of the showerhead, just think about that.

A tempering valve is one of the minor modifications that may help to guarantee that the water in your house is always at the proper temperature. If you’ve never heard of them or aren’t sure how they function, you’re not alone! Continue reading to learn more.

What is a Tempering Valve on a Hot Water Heater

A tempering valve, otherwise known as a hot water mixing valve or a hot water tempering valve, is either a 2-inlet or 3-inlet adjustable mixing valve activated by temperature. It regulates the water temperature released from outlets throughout your home by mixing hot and cold water to achieve a particular temperature.

How Does a Tempering Valve Work?

The tempering valve essentially controls the temperature of the water being supplied to your taps and showers. It does this by using a cartridge with thermostatic control, which regulates the temperature of the water.

When the cartridge is triggered, a portion of the hot water is mixed with cold water in the attached mixing chamber, and the mixed water is then released to the taps. The cartridge can be adjusted to ensure that the mixed water temperature is always at the desired temperature.

What Temperature is a Tempering Valve Normally Set At?

Tempering valves are almost always set never to exceed a temperature of 49 degrees celsius. If you are installing a new tempering valve, this is the standard default setting.

However, if you are replacing an existing valve, it may be set at a higher or lower temperature. It is worth checking the temperature of your hot water, whatever it is at the moment, as this is often the temperature that the tempering valve will be set at.

For example, if you are replacing an old tempering valve and the water comes out of your shower at a higher temperature than 50 degrees, you might want to adjust the temperature accordingly.

Why Your Hot Water Heater Needs a Tempering Valve

The main reason behind installing a tempering valve is to control the temperature of the hot water being released. You can ensure that your family is always safe by controlling the temperature, knowing that the water temperature is not exceeding a certain level.

Sometimes, the water temperature may be set at an incorrect temperature, leading to severe burns or scalding. Another reason is to ensure that the water flowing out of your household outlets conforms with the relevant Australian Standards (A3500).


A tempering valve is a simple but necessary addition to any hot water system.

The tempering valve ensures that hot water is only released at a temperature safe for use. It also helps to control the temperature of the water being used in your home regarding the Australian Standards.

Do you need plumbers in Northern Beaches to help you address your tempering valve concerns? We at Plumd In Plumbing offer professional plumbing services. Contact us today to learn more!

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