For something that can control hot water temperature, tempering valves are quite simple in how they work. They are a three-way mixing valve. One allows hot water in, a second pulls cold water in from the water supply, and the third is the exit for the 50°C water. As the system lets in hot and cold water, it adjusts the temperature before letting out the tempered water.

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It’s worth knowing and noting that there are four main tempering valve types. You can easily identify them by the colour of their caps, and manufacturers design them to work with various hot water system types. These include:

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Cash Acme thermostatic mixers can also be used to blend the flow and return in underfloor hydronic and radiant floor heating systems. They provide a safe, energy efficient and stable temperature in the heating system, preventing heat damage to the building and creating safer underfloor surfaces.

Tempering valves limit the temperature of hot water systems in Australian homes. More specifically, fixtures that use hot water for personal hygiene purposes, for example, the shower.  It only takes half of a second for 70°C  hot water to give a child third-degree burns.

This is why your plumbing system needs to be properly flushed by a plumber before they even begin installing a tempering valve. Regular flushing will also help to prolong the life of your valve as well as other plumbing fixtures!

Domestic homes require a tempering valve. However, businesses that care for children and the elderly, such as child care centres, secondary schools and nursing homes, use a thermostatic mixing valve.

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Thermostaticmixing valve

Whether you need a solution that provides anti-scald protection at the heat source, the point-of-use, or somewhere in between, Cash Acme has the TMV plumbing solution to fit your needs.

Cash Acme is an experienced supplier of thermostatic mixing valves (TMVs), providing an extensive range of devices for residential, commercial, industrial and even hydronic heating applications. Also commonly referred to as anti-scalding valves, our TMVs accurately control the temperature of hot water at the source of heat (water heater) to deliver point-of-use (showers, sinks, lavatories, bath tubs, etc.) water at safe, controlled temperatures, regulate water distribution and flow and provide sanitary anti-scald protection.

Mixing valvefor boiler

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Given that the tempering valve regulation was introduced to avoid scalding from too hot water, you might worry about it failing and hurting your family during daily personal hygiene purposes. As water temperature increases, the contact time required to receive a third-degree burn decreases:

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Only homes that have a storage tank for their hot water need a tempering valve. Homes with tankless continuous flow models don’t need these valves. This is because there is no stored hot water which is prone to Legionella bacteria growth.

If you choose, however, your tempering valve can be set lower than the 50°C maximum! For example, if you’re installing a hot water unit that young children or elderly people will be using, perhaps consider a thermostatic mixer. We’ll be touching on this hot water valve shortly.

Read Hot Water Systems: The Complete Guide to learn more about the best hot water system for your home. Contact Metropolitan Plumbing for your local heated water tempering valve experts.

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Mixing Valvefor sink

If your tempering valve does fail and you notice your water temperature higher than normal, you should contact a professional plumber to fix the problem. Until you’ve solved the problem, be sure to monitor any children when they are using hot water.

We find that a build-up of minerals and other materials is the most common reason for replacing tempering valves for hot water systems. Carried in the hot and cold water that moves through your plumbing, these minerals and other materials accumulate in your pipes and fixtures over time. This accumulation eventually impacts the performance of the hot water mixing valve in your fixture, and in severe cases will stop it from working entirely.

Filters are often recommended to be installed to prevent the build-up from occurring in the first place. An older hot water system and its associated tempering valve are especially prone to rust and build-up and so should be checked more regularly.

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The Plumbing Code of Australia mandates that specialists must set the thermostat of tank-based hot water systems to 60°C or higher to inhibit the growth of harmful bacteria like Legionella. The risk of burns necessitated balancing ‘the requirement for minimising the risk of bacterial infection. As a result of this, the installation of a full hot water tempering valve, which restricts the hot water usage to a maximum of 50°C became a mandated rule.

Mixing valvefor water heater

Did you know that it’s an Australian regulation to have a tempering valve installed? Like most people, you might be wondering, what is a tempering valve? Here’s everything you could ever want to know.

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Before installation even begins, you need to flush the plumbing system to prevent a build-up in the valve. This build-up will not only impact the performance of the tempering valve, but it will potentially void the warranty as well!

Installers typically fit most tempering valves into the hot water system, and they must also install isolating valves, line strainers, and check valves at the cold and hot water inlets. Depending on the water pressure, you might also need to install pressure-reducing valves.

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MasterMixing Valve

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This lower temperature is important for those with more compromised or sensitive skin, such as those in nursing homes. 45°C is a much safer temperature to prevent damage and injury here.

Inside the valve is a thermostatic element. A temperature-sensitive element, submerged in water, responds to changes in water temperature. In response to these changes, the thermostatic element expands and contracts. This motion controls a piston that opens and closes the three inlet and outlet valves. Through piston action, the system selectively mixes hot water with cold water until it reaches 50°C. Only then does it open the outlet valve to deliver hot water to the fixture.

You can adjust your hot water system tempering valve using a knob to any temperature between 35-55°C. However, a licensed plumber must make the adjustments, ensuring they do not exceed 50°C.

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Thankfully, most tempering valves have a thermal shut-off feature. This effectively closes the cold and hot water inlet valves in event of a problem. If this isn’t the case with yours, you will at least be able to notice when your hot water storage system is hotter than usual.

Much like your hot water system, your hot water tempering valve will deteriorate over time. Provided you keep up with your plumbing maintenance, you can expect it to give you a good 5-8 years of safely heated water.

WaterMixing Valve

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When considering a hot water system replacement, it is essential to recognise the critical role of tempering valves. These valves are instrumental in regulating the water temperature to just below the boiling point, ensuring safety and efficiency. The process of hot water system replacements involves the selection of a suitable unit. It also necessitates a thorough understanding of the existing plumbing framework to guarantee a seamless transition. When you hire a skilled service for your hot water system replacement, they will correctly install all components, including tempering valves, and ensure they function at their optimal capacity.

The thermostatic element is accurate within 3°C. This means that the temperature of the hot water emerging from your fixture’s tap will be within plus or minus 3°C of the set temperature.

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A thermostatic mixing valve works by the same mechanism as a tempering valve, but is both more accurate and faster to deliver a safe temperature. Water temperature coming from a tempering valve is accurate within 3°C, while a thermostatic mixing valve, is only out by 1°C! In addition, thermostatic mixing valves must be set no higher than 45°C.

As we attempt to answer the question of “What is a tempering valve?”, it’s important to note that the similar thermostatic mixing valve (or TMV) also exists. Both are designed for mixing hot and cold water to regulate hot water tank temperature. So when it comes to determining whether you need a TMV or tempering valve, it helps to understand the differences between the two and what they do for your hot water supply.

Cash Acme temperature mixing valves are manufactured according to ISO 9001 standard, ASSE / IAPMO / CAS fully certified, and come preset at 120 F to fit standard U.S. and Canadian plumbing codes. Each thermostatic mixing valve is tested for function, safety, and performance before leaving our factory.

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