🔥Why Tempering Valves Are the Unsung Heroes of Your Hot Water System

Mar 25

Have you ever turned on the tap and nearly burned your hand — or stood under a shower that couldn’t make up its mind between scalding hot and freezing cold? That’s where the humble tempering valve steps in.

You may not know it, but if you live in Melton, Brookfield, Kurunjang, or anywhere across Melbourne’s west, this little device might be quietly protecting you and your family every single day.

🚿 What Is a Tempering Valve?

A tempering valve is a small device connected to your hot water system. Its job? Mix hot water with cold to make sure the water coming out of your bathroom taps, showers, and bathtubs doesn’t exceed a safe temperature — usually 50°C in most homes.

It’s basically a smart thermostat for your hot water. Set and forget.

🛡️ Why Is It So Important?

Scalds happen fast: Water at 60°C can cause third-degree burns in just 1 second.
Kids and elderly are most at risk: Their skin is thinner and more sensitive.
Australian law requires it: In new homes and during hot water unit replacements, tempering valves are mandatory.

They don’t just keep you safe — they help you stay compliant with plumbing regulations like AS/NZS 3500.4:2021.

🔧 How Does It Work?

Think of a tempering valve as the traffic cop at the intersection of hot and cold water. It:

Receives hot water from your system
(often over 60°C)
Adds just the right amount of cold water
Sends out "tempered" water at a safe, steady 50°C

No more guessing games. No more risky showers.

📏 Where Are Tempering Valves Required?

In Australia, tempering valves are legally required for:

Bathrooms (for personal hygiene use)
New builds
Hot water system replacements
Extensions or renovations that involve plumbing

Not required for kitchens or laundries, where hotter water is often needed for cleaning.

⏳ How Long Do They Last?

Tempering valves are tough, but not immortal.

✅ Average lifespan: 5–8 years
🧼 Regular maintenance = longer life
⚠️ Signs it may need replacing:
- Water fluctuates between hot and cold
- Water is too cold despite a working HWS
- Pressure is unusually low

🧠 Fun Fact: They Also Help Fight Bacteria

Some bacteria (like Legionella) thrive in lukewarm water. By allowing your hot water system to store water at 60°C while still delivering safe 50°C water to outlets, tempering valves help reduce bacterial risk without compromising safety.

💸 Are They Expensive?

Not really. A new valve plus installation typically costs $250–$450. A small price for peace of mind, safety, and compliance.

✅ The Bottom Line

If your hot water system doesn’t have a tempering valve, or it’s more than a few years old, it might be time to get one checked or replaced.

It’s one of those things you never think about — until something goes wrong.

📞 Need Help with Your Tempering Valve in Melton or Surrounds?

At Fox Plumbing & Drainage, we install and service tempering valves across Melton, Brookfield, Harkness, Kurunjang, Melton West, and beyond.

👉 Call Peter on 0405 900 418 for a quick inspection or replacement.
We’ll make sure your hot water stays safe, steady, and up to code.

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