3 Things You Should Know About TMVs

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This important piece of plumbing is most likely protecting you already, without you even knowing. Not sure why you need a Thermostatic Mixing Valve (TMV) or why it’s important? Below we’ll discuss 3 things you should know about TMVs.

What Is A Thermostatic Mixing Valve?

A TMV is a plumbing device that blends hot and cold water together to supply your building with a constant reliable hot water temperature from the hot water tap. This device works not only to keep the flow of hot water constant but also safe. The delivered temperature of the water is usually set by the licensed mechanical plumbing professional completing the installation or maintenance.

A TMV has a thermal-sensitive component which contracts and expands in response to fluctuations in the temperature of incoming cold and hot water maintaining the safe delivery temperature set by the plumber.

Why Do You Need A TMV?

A TMV is important to have as it maintains safe water temperature standards, which help to avoid potential burns, scalding or even thermal shock. This is important in both the home and commercial buildings as it is an occupational safety issue.

Australian plumbing standards dictate that hot water systems with storage tanks must be kept at a temperature of 60°C or more, preventing the growth of Legionella and other harmful bacteria in the stored water. However, you wouldn’t want 60°C water delivered directly out of your tap as this is dangerous and could result in an injury. This is where a TMV device comes in to help.

The TMV regulates the temperature by combining hot water with cold water to maintain a constant, safe output of water. A tempering valve (different from a TMV) functions in a similar way.

It’s important to have thermostatic mixing valve testing conducted regularly so that you know your device is working effectively and meets government regulations. The Victorian Building Authority states that only specific TMV licensed plumbing professionals can complete repairs, alterations, maintenance and testing on a TMV device.

Do I Need A TMV Or A Tempering Valve?

Now that you know the importance of regulating water temperature, let’s discuss whether you need a TMV or a tempering valve. 

A tempering valve is typically installed in smaller scale standard domestic water heating situations. The tempering valve combines the 60°C+ water from the hot water storage tank with cold water to lower the temperature to a far safer 50°C before it reaches the tap fixtures. This significantly reduces the risk of burns or scalding.

A TMV responds quicker to pressure and temperature variations than a tempering valve. It is usually fitted in instances where there is a demand for more accurate control of the water temperature, as well as in larger commercial applications such as hospitals, schools, shopping centre bathrooms, hotels and other large facilities with sanitary fixtures for personal hygiene.

Your licensed commercial plumbing professional will be able to tell you which device your plumbing situation requires.

At Banjo Nominees, we provide a range of industrial TMV testing and plumbing maintenance services to keep your workplace safe and protect your business from costly shutdowns and damages. Make an enquiry today – call (03) 9397 1111.