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Imagine getting a steamy hot shower after a long and tiring day. Is there any better way to rejuvenate your mind and body?

Well, certainly not! After work, a hot shower offers numerous benefits, from muscle relaxation to easing stress. However, a faulty thermostatic mixing valve can ruin your experience and leave you with serious injuries.

As you can imagine, a malfunctioning thermostatic mixing valve fails to blend and regulate hot and cold water, which results in a sudden increase or decrease in water temperature. Many Australians face severe scalding and shock injuries every year in their bathrooms.

So, if you don’t want to face such issues while taking a much-deserved hot shower, we highly suggest testing your thermostatic mixing valve regularly. This article will tell you everything you need to know about thermostatic mixing valve testing.

Now, without further ado, let’s begin!

What Is A Thermostatic Mixing Valve?

Also known as TMV, a thermostatic mixing valve is a unique plumbing valve that mixes cold and hot water to control the temperature of hot water outlets to safe levels. They are widely used in homes, healthcare facilities and schools to protect individuals by minimising the risk of scalding from boiling water from wash-hand basins, baths and showers.

These specially designed plumbing valves allow cold and water and carefully blend them using an internal thermal component. This ensures they can deliver a mixed water stream at a pre-set temperature, usually between 39 degrees Celsius and 43 degrees Celsius.

Commercial Thermostatic Mixing Valve

The Dangers Of A Drastic Change In Water Temperature

Drastic and sudden changes in water temperature while taking a shower can cause harm to your body. Believe it or not, it can even send you to a hospital. When the thermostatic mixing valve in your plumbing system is not optimal, it fails to regulate the water temperature.

As a result, it can become too cold or too hot while you are showering. And truth be told, it is not a desirable state of affairs.

When The Water Is Too Cold

When cold water suddenly pours down on you while showering, it could result in a thermal shock, causing you to jump back to escape the extreme water temperature instantly. It might make you slip and fall over, resulting in bodily injuries.

When The Water Is Too Hot

Boiling water pouring down your body can cause burns, damaging your skin. Note that young children and the elderly are more prone to third-degree burns.

Thermostatic Mixing Valve: Installation and Testing

If you don’t want your water to have such adverse effects, installing a tmv valve is the only option. Fortunately, both commercial and residential properties in Australia are installing these devices to ensure the safety of their users.

Remember that installing a thermostatic mixing valve is just the first step. To ensure that it functions appropriately, periodic checks of the valve’s operation are an absolute must.

What Should Be The Frequency Of The Testing?

There’s no clear answer, as different plumbing contractors offer different testing periods. However, as a rule of thumb, these periodic checks should be done at least once a year.

If you install it for the first time, the plumbing specialists should conduct a great service test after 7-8 weeks. Depending on the results obtained from the check, more tests are run. Below, we have listed some possible outcomes and the appropriate action plan.

As soon as noticeable variations in the water temperature are detected, it would be best if you made the necessary adjustments to the temperature as quickly as possible. It is recommended to conduct the next test after 21 weeks from the previous test date. Moreover, if you notice a minor variation in the temperature of the water, you need to make the necessary adjustments again if the temperature has changed a little. Following this, the test should be conducted after 28 weeks, after which it should be repeated.

Suppose the mixed water temperature is not significantly affected by any changes in the temperature of the mixed water. In that case, there is no need to adjust the thermostatic mixing valve’s water temperature. It is also possible to conduct the next test after 28 weeks from the first one.

Consequently, it is important to keep in mind that fluctuations in the water temperatures detected during the checks could also be a result of unstabilised water supply conditions, which is important to keep in mind. Undoubtedly, it is imperative to get an audit of the water supplies to achieve this goal.

What Is The Testing Procedure Of Thermostatic Mixing Valve

More often than not, the testing procedure depends on the kind of thermostatic mixing valve installed. However, some basic steps need to be followed regardless. First, you need to check the temperature of the blended water.

Then detach the cold water supply from the thermostatic mixing valve. After that, wait five seconds and check if the water temperature is under 39 degrees Celsius. If you don’t notice any considerable changes, the thermostatic mixing valve is working correctly.

However, if you notice any change exceeding 2 degrees Celsius, the valve isn’t working and needs to be tested by professionals as soon as possible.

Signs Of A Faulty Thermostatic Mixing Valve

It is important to be aware of the following signs if you suspect that a thermostatic mixing valve is malfunctioning, apart from extreme water temperatures:

Testing Water Tempreture Bathroom

1. Leaks Or Drips

One of the most common signs of a faulty thermostatic mixing valve is leaks or drips from the valve itself. If you notice water pooling on the floor, it might indicate a corrosion or sealing problem. Be sure to call a professional and qualified plumber and get it fixed immediately; otherwise, it may cause water damage.

2. Inconsistent Water Flow

Another significant sign of a malfunctioning thermostatic mixing valve is inconsistent water flow. For instance, if you notice water pouring most of the time slowly, it could be because your TMV has issues. Maybe it has not been installed correctly or started to rust, hindering the water flow.

Frequently Asked Questions (FAQs)

In this section, we have tried answering several frequently asked questions about thermostatic mixing valves. Hopefully, all your doubts will get cleared once you go through this.

1. How to adjust the temperature supply of a thermostatic mixing valve?

To adjust the temperature supply of a thermostatic mixing valve, you need to remove the cap on the top of the valve. Then use a close-fitting spanner to change it. To decrease the temperature, turn clockwise and to increase the temperature, turn anti-clockwise.

2. Is a tempering valve the same as a thermostatic mixing valve?

No, both are entirely different items. Tempering valves are temperature-activated and adjustable, which means they alter hot water flow to ensure that the water is not too hot on reaching the tap. They work by mixing cold and hot water systems to deliver it to your tap at the right temperature.

On the other hand, thermostatic mixing valves work by blending cold and hot water to attain a particular temperature, and then the water is supplied through various outlets. With TMVs, the temperature is generally pre-set by a plumbing specialist. The inside component senses the thermal activity and accordingly arranges cold and hot water levels.

3. What are the significant differences between a tempering valve and a thermostatic mixing valve?

Some of the significant differences between a tempering valve and a thermostatic mixing valve are as follows:

  • Thermostatic mixing valves respond to pressure fluctuations better and quicker than tempering valves.
  • TMVs require more servicing than tempering valves
  • Thermostatic mixing valves last longer
  • TMVs are more expensive

The Importance Of TMV Testing

With that, we have finally reached the end of this article. We hope by now you know pretty much everything about the importance and testing procedure of thermostatic mixing valves.

Before we sign off, here’s our last word of advice: We highly recommend hiring a reputable plumbing specialist to deal with issues with your plumbing system. This is because they are well-versed with all the necessary know-how and equipped with the right tools and resources to conduct the tests effectively. If you are in Perth, contact our reliable plumbers.

On that note, it’s a wrap. Until next time, take care!


Ashley Woolf

Ashley Woolf

Find them on their website: Woolf Plumbing & Gas, Facebook and LinkedIn.

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