What is a tempering valve?
Maintaining hot water safety using a simple and uncomplicated device.
If you have recently had a new hot water system installed, or the current one repaired or replaced, it's likely that the plumber made a reference to the "tempering valve." As homeowners, our main concern is simply ensuring we can enjoy refreshing hot showers and have access to hot water whenever we need it. That's why we tend to leave any further technical aspects to the plumber. But for homeowners who have a curious disposition and want to know what a tempering valve is and why we need it, here is a brief explanation.
What is a tempering valve?
A tempering valve will ensure that the water that comes out of your tap is safe and at the right temperature to eliminate the risks of burns, for you, your family, and any visitors. They are crucial safety devices for maintaining water safety and preventing accidents. Tempering valves have a temperature-sensitive element that focuses on adjusting the mix of hot/cold water depending on two factors:
- One - The desired setting of the tempering valve
- Two - The temperature of any incoming water flow.
What does a tempering valve do?
The primary function of a tempering valve is to blend hot water and cold water to achieve a desired and safe outlet temperature. It helps prevent scalding or burning by controlling the temperature of the water that comes out of faucets or showerheads. The valve is typically installed at the point where hot water is distributed, such as the water heater outlet or the supply line leading to specific fixtures. There are three main components: a hot water inlet, a cold water inlet, and a mixed water outlet. Inside the valve, there is a thermostatic element or a temperature-sensitive mechanism that adjusts the flow of hot and cold water based on the set temperature. When the water temperature exceeds the desired level, the valve reduces the flow of hot water and increases the proportion of cold water, thus lowering the outlet temperature. Similarly, if the water is too cold, the valve adjusts the mix to raise the temperature.
What is the standard temperature setting for a tempering valve?
According to Queensland legislation, hot water is to be heated to a minimum of 60° C to prevent the growth of bacteria such as Legionella. A tempering valve ensures that hot water flows from taps at a maximum temperature of 50° C. It's important to note that the specific design and operation of tempering valves may vary slightly, but their general purpose remains consistent: to regulate water temperature and provide a safe and comfortable water supply.
What is the difference between a TMV and a Tempering Valve?
Now you have an idea of what a tempering valve is and why they are so important, let's briefly touch on Thermostatic Mixing Valves ( TMV) which are used for the same reason as a tempering valve but in different situations. It's easy to be a little confused about these 2 devices and in what situation either is needed. They both mix hot and cold water together to achieve a specific water temperature, however, thermostatic mixing valves are required by law in the following locations, due to the possibility of high-risk people being present such as the elderly, sick, or children.
- Hospitals.
- Schools.
- Aged care facilities.
- Nursing homes.
- Childcare facilities and afterschool care.
- Respite centers.
- Hotels.
- Shopping center bathroom facilities.
Should you have any questions or need assistance with a hot water system contact Leak Free Plumbing Solutions on 0422 392 447 and speak to one of our licenced plumbers or complete our quick online booking form today.
Reference
https://www.hpw.qld.gov.au/__data/assets/pdf_file/0021/11379/installing-temperature-control-devices.pdf