What is a Tempering Valve?

Got a new hot water unit?

You must consider installing a tempering valve for your hot water system for the safety of your family and friends this also ensures the delivered water temperature complies with Australian Standard AS3500.4.2 Clause 1.6.

Plumbing Part

How does a tempering valve work?

A tempering valve blends hot water with cold water to ensure constant, safe shower and bath outlet temperatures, preventing scalding.

How would it help you?

The Plumbing Code of Australia (PCA) has two conflicting requirements.

Prevent the growth of Legionella bacteria, the cause of Legionnaires’ disease, it is a strict requirement that any stored hot water be kept at minimum temperature of 60°C.

The same Code requires that the delivery temperature of hot water for personal hygiene purposes is not to exceed 50°C and in some institutes e.g. facilities for young, aged, sick or disabled persons, the maximum delivery temperature is 45°C for safety purposes.

In order to meet both of these requirements a tempering valve needs to be installed, The hot water tank maintains the 60°C strict requirement to prevent bacterial growth while the tempering valve with a temperature sensitive element allows cold water to flow with the hot water through the pipes delivering constant hot water temperature to your kitchen and shower taps.

With this mechanism and design it maintains a constant outlet temperature, reducing the risk of bacterial infection and accidental scalding.

Tempering Valves Types:

Blue Cap Tempering Valve – most commonly used for electric water heaters

Green Cap Tempering Valve – recommended for gas hot water systems

Orange Cap Tempering Valve – best for solar hot water and heat pump hot water systems

Black Cap Tempering Valve – recommended for large capacity systems

If unsure which valve best suits your unit, simply ask us for advice and we can discuss this matter with you.

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