Full Flow Plumbing & Drainage

tempering valve vs tmv

Tempering Valve vs TMV

When installing or maintaining hot water systems, it’s essential to understand the differences between a tempering valve vs TMV. Both plumbing fittings help to achieve a safe and consistent water temperature by mixing hot and cold water. However, key distinctions make them more suitable for certain settings.

One notable difference between a tempering valve vs TMV is their accuracy in maintaining the desired water temperature. Tempering valves are accurate to around 3°C +/-. Thermostatic mixing valves (TMV) can maintain a much tighter range, keeping the water to 1°C +/-.

The increased accuracy in thermostatic mixing valves allows them to respond faster to changes in incoming water temperature, making them a better choice for environments requiring precise temperature control.

Another consideration is the cost and lifespan of these two valve types. Generally, tempering valves are more affordable than TMVs, making them a popular choice for homeowners. TMVs tend to last longer than tempering valves, making them a more cost-effective solution in the long run, especially for commercial applications. The choice between a tempering valve vs TMV depends on the specific requirements and priorities of a given hot water system.

Tempering Valve vs TMV – What is the Difference?

To provide a safe and comfortable water experience, we use tempering valves and thermostatic mixing valves (TMVs) for our hot water systems. Both types of valves serve the primary purpose of blending hot and cold water to achieve a desired temperature.

Here are the key differences of a tempering valve vs TMV:

  • Tempering valves offer a temperature accuracy of around 3°C +/-, while TMVs boast a finer precision, deviating by only 1°C +/-.
  • TMVs can react quickly to fluctuations in incoming water temperature, making them ideal for settings demanding precise temperature control.
  • While tempering valves tend to be more budget-friendly, making them a preferred choice for residential setups, TMVs are recognised for their longevity, often making them a more cost-efficient solution for long-term commercial applications.

A popular choice for electric, gas, and solar water systems, tempering valves blend stored hot water with cold to achieve an approximate temperature of 50°C. This safeguards users from abrupt temperature spikes and potential bacterial threats. Their accuracy margin has a 3°C variance.

TMVs stand out for their advanced temperature control. They have a specific thermal element that promptly adjusts to temperature variations, maintaining water temperature within a precise range of 1°C. TMVs typically have an extended operational life due to their repairability and heightened accuracy.

Installation and Servicing

As licensed plumbers, we adhere to Australian Standards when installing and servicing thermostatic mixing valves (TMVs) and tempering valves.

A certified plumber is essential for TMV and tempering valve installation and service. This ensures the work is carried out according to the relevant plumbing codes and guidelines. Our team of plumbers is well-equipped with the necessary qualifications and skills to handle these tasks with professionalism.

Though TMVs cost more initially than tempering valves, their accuracy and speed may justify the costs, especially for businesses. Regular TMV servicing involves comprehensive assessments, leak and corrosion inspections, and temperature verifications. Any necessary repairs are transparently discussed before commencement.

Tempering valves are often replaced rather than serviced or repaired, although they are economically priced.

Specific Uses of Hot Water Mixing Valves

In various establishments, tempering valves and TMVs play a vital role in ensuring water temperature safety for users.

  • Elderly Care and Medical Facilities: Precise water temperature is essential. TMVs, with their superior accuracy and responsiveness, are often the preferred choice, minimising risks of scalding and bacterial contamination.
  • Educational and Child Care Facilities: While both valve types can be implemented, TMVs are generally favoured for their reliability and extended lifespan.
  • Residential Settings: Tempering valves are generally adequate for standard household applications, combining safety and affordability.

Guidelines set required water temperature for different situations. In healthcare and aged care facilities, early childhood centres, and schools, temperatures should not exceed 45°C.

In homes, tempering valves can be a cost-effective solution for maintaining safe water temperatures, especially in showers. While they may not provide the same accuracy as TMVs, their performance is sufficient for general household use, ensuring the comfort and safety of occupants.

Australian Standards and Regulations

In Australia, certain standards ensure hot water system safety. These include the AS4032.3.2022 (Valves for the control of heated water supply temperatures). These Australian Standards protect users from scalding and other hazards associated with hot water systems.

The Australian standard requires TMV testing annually and thermostats and O-ring replacement every five years. This is important for solar hot water systems, where hot days can heat water more, increasing scalding risks.

Tempering Valve vs TMV Based on Hot Water System Type

When deciding between a tempering valve vs TMV for your hot water system, consider the energy source that your system uses.

  • Gas Systems: Both valves are compatible, but TMVs, with their rapid temperature adjustments, might optimise energy consumption.
  • Electric Systems: The choice depends on needs, but TMVs may offer a performance edge with precise regulation. A tempering valve is popular for residential homes.
  • Solar Systems: Given their eco-friendly nature, solar systems paired with TMVs can optimise temperature consistency.
  • Heat Pumps: These energy-efficient systems, when coupled with TMVs, can maintain optimal water temperatures, enhancing overall performance.


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