Need to know if your home requires a tempering valve in Victoria? We explain when the device is mandatory, how it keeps hot water safe at about 50°C at outlets, and why storage tanks stay at 60°C to reduce Legionella risk. Call us any time on 1800 571 216 — we’re OnCall Emergency Plumbers in Melbourne and available 24/7 for emergency repairs, compliant installs and practical advice.
We outline where the valve sits near the hot water unit and how a thermostatic element blends hot and cold water to hold outlet temperature within about ±3°C. Installation and adjustment must be done by a licensed plumber under the Plumbing Code of Australia, and most new or replacement hot water systems need one, with a few continuous flow exceptions.
Our team focuses on fast, affordable service using trusted brands so your system meets legal and safety standards.
Key Takeaways
- Most new or replacement hot water units in Victoria require a tempering valve; some continuous flow units are exempt.
- The device mixes hot and cold water to deliver about 50°C at taps, while tanks store water at 60°C+ to lower bacteria risk.
- Only a licensed plumber can install or adjust the device to meet the Plumbing Code of Australia.
- We offer 24/7 Melbourne services for installs, emergency hot water faults and compliant testing.
- Look for inconsistent outlet temperatures or leaks as signs the valve needs servicing or replacement.
Stay safe and compliant with regulated hot water temperatures in Victoria
We explain how regulated hot water temperatures protect households from scalding while keeping storage tanks hot enough to control harmful bacteria.
Hot water storage must be kept at a minimum of 60°C to reduce Legionella risk, while outlets are tempered to about 50°C to reduce scalding. This balance between tank setpoints and outlet safe temperature is vital for any hot water system in a home or business.
Most new or replacement water systems require a tempering valve under the Plumbing Code of Australia. Only a licensed plumber can install and set these devices so the water supply meets code and duty-of-care obligations.
We assess installations, confirm setpoints, and recommend extra measures where sites need higher protection. Call us 24/7 on 1800 571 216 for rapid service if your water temperature fluctuates or your system stops delivering consistent hot water.
- We check tempering valve settings and hot water system compliance.
- We advise on routine checks to keep temperatures safe and hygienic.
- We provide fast repairs across Melbourne to restore compliant temperatures.
What a tempering valve does and why your hot water system needs one
A thermostatic mixing element senses outlet heat and adjusts the hot and cold feed so taps stay close to a target temperature.
How hot and cold water are blended for a safe temperature
The thermostatic mechanism expands or contracts with heat. This motion moves an internal piston to mix hot and cold water. The result is a steady outlet that aims for about 50°C despite pressure or flow changes.
Why storage tanks heat to 60°C but outlets are capped at about 50°C
Storage heaters are kept at 60°C or higher to reduce bacterial growth in the tank. At taps we deliver a lower, safe temperature to prevent scalding. This dual approach protects health while keeping users safe.
Where tempering valves sit in water systems and typical accuracy
The unit is usually fitted close to the water heater to give fast, stable mixing. Typical accuracy is about ±3°C. We fit isolating and pressure-control fittings where needed to protect performance.
- We calibrate the mixing valve to a safe outlet and verify taps throughout the property.
- Keep filters and strainers clean to avoid debris damaging the thermostatic element.
- Call us on 1800 571 216 for expert installation and 24/7 support.
| Feature | Purpose | Typical Range |
|---|---|---|
| Thermostatic mixing | Blend hot and cold for safety | ~50°C at outlets |
| Storage setpoint | Limit bacteria in tank | ≥60°C |
| Accuracy | Maintain steady output | ±3°C |
| Installation location | Near water heater | Within 1–2 metres of outlet |
Victorian safety rules: when a tempering valve is required
Local rules require most new and replacement hot water installations to limit tap temperatures to around 50°C. This protects occupants from scalding while allowing storage tanks to remain hot enough to control bacteria.
Plumbing Code requirements and safe temperature limits
The Plumbing Code of Australia requires a mixing device on most new or replacement hot water systems so outlets stay at about 50°C. Storage must be set at or above 60°C to reduce bacterial risks in the tank.
Exceptions for some continuous flow water heaters
Certain continuous flow water heaters that are factory-set to 50°C may not need an additional tempering valve. We assess the specific water heater and confirm whether extra mixing is necessary for compliance.
Why installation and adjustments must be done by a licensed plumber
Only a licensed plumber may perform the installation and calibration to meet code. Correct placement near the water heater, plus isolating and pressure-limiting valves, keeps the mixing device reliable and adjustable.
- We ensure code-compliant installation and provide documentation for rentals or commercial checks.
- Failing to comply risks safety, insurance coverage and tenancy obligations.
- Contact us for licensed plumbing, fast installation and full system verification on 1800 571 216.
| Requirement | Purpose | Typical setpoint |
|---|---|---|
| Outlet mixing | Prevent scalding | ~50°C |
| Storage setpoint | Limit bacteria | ≥60°C |
| Licensed installation | Legal compliance | Plumber required |
When you need a tempering valve: common household and business triggers
Major upgrades, replacements or renovations often create the need for a compliant mixing device. We assess each project and advise whether a new unit is required to meet safety rules and tenancy obligations.
Upgrading or replacing hot water systems, renovations and extensions
Replacing a storage heater almost always triggers a legal requirement for a compliant mixing device that delivers about 50°C at outlets.
Renovations and extensions are a practical time to fit or replace the unit with minimal disruption and to integrate other hot water system upgrades.
Homes with children or elderly residents, rentals and compliance checks
We strongly recommend mixers for homes with young children or elderly occupants to reduce scald risk. Landlords and property managers must include checks during periodic rental inspections.
- Choose capacity and configuration for multiple bathrooms and high-demand fixtures.
- Consider water quality, pressure and cold water supply when sizing the device.
- Pre-set continuous flow units may meet limits without a separate fitting in some cases.
We help households, landlords and businesses across Melbourne stay compliant and safe. Call us 24/7 on 1800 571 216 for fast installations, replacement and testing.
Spotting trouble: signs your water tempering valve needs service or replacement
Early detection keeps your hot water system safe and avoids costly downtime. We recommend quick checks when outlets act up so issues are fixed before they worsen.
Inconsistent temperature, reduced flow or visible leaks
Common symptoms include fluctuating outlet temperatures, slow flow and drips or hissing from the unit body or connections.
Mineral build-up, debris or worn internals often make the mixing unit drift from its setpoint or stick when blending hot and cold water.
Recommended maintenance intervals and expected lifespan
We advise routine maintenance about every two years to avoid surprises and keep outlet temperature within the safe band.
With scheduled checks and good water quality, a well-maintained tempering valve can last around 10 to 15 years before replacement becomes sensible.
- When to repair vs replace: repair small leaks or recalibrate if internals look good; replace if corrosion, heavy sediment or repeated faults occur.
- Our diagnostics: outlet temperature verification, inlet pressure balance and cold water isolation tests to pinpoint faults quickly.
- Prevention: fit strainers or filtration to reduce premature wear and extend component life.
| Check | Why it matters | Action |
|---|---|---|
| Fluctuating temperature | Risk of scalding or cold shocks | Call for diagnostics |
| Reduced flow | Blockage or worn parts | Service or clean |
| Leaks or noise | Failing seals or internals | Repair or replacement |
We provide 24/7 diagnostics, servicing and affordable replacement using quality parts from trusted brands. For urgent help in Melbourne, call 1800 571 216.
Tempering valve vs thermostatic mixing valve: which mixing valve suits your needs?
Choosing the correct mixing device affects safety, bacterial control and daily performance in your property.
We compare standard tempering valve options with thermostatic mixing valves so you can decide which fits your hot water setup. Tempering valves give reliable general-purpose outlet temperatures of around 50°C. They suit most homes and rental properties.
Key differences between tempering and thermostatic mixing valves
Thermostatic mixing valves deliver tighter control and faster response. They are ideal for aged care, clinics and schools where precise setpoints and protection for vulnerable users matter.
Managing harmful bacteria risks while maintaining safe temperatures
We keep storage setpoints at 60°C or higher to limit harmful bacteria such as Legionella, while outlet mixing keeps taps safe. Licensed installation is required so systems meet code and documented compliance.
Hot water efficiency, pressure considerations and system performance
Layout, pressure balance and fixture mix influence which device performs best. We assess your plumbing, cold water supply and usage to recommend upgrades, recirculation changes or larger units for consistent delivery.
- When to pick a TMV: precision settings, healthcare and vulnerable occupants.
- When standard mixing works: most family homes and simple hot water systems.
- Our offer: we assess your property and provide a clear recommendation, compliance checks and a quote. Speak with OnCall Emergency Plumbers on 1800 571 216.
| Feature | Tempering valve | Thermostatic mixing valve |
|---|---|---|
| Accuracy | Good (~±3°C) | Higher precision |
| Best use | General homes, rentals | Healthcare, aged care, schools |
| Maintenance | Periodic service | Regular testing and calibration |
OnCall Emergency Plumbers: Melbourne experts in installation, maintenance and emergency repairs
When hot water stops, we prioritise rapid diagnosis and on-the-spot repairs to get your system running again.
Our team offers 24/7 emergency plumbing with skilled technicians who handle general plumbing, blocked drains, burst pipes and leak fixes across Melbourne. We focus on fast, safe outcomes and clear communication.
24/7 emergency plumbing with rapid response for hot water supply issues
We arrive prepared with stocked vehicles to complete most repairs and replacement parts on the first visit. Licensed plumbers must install and adjust mixing devices, so we always perform installs to code.
- Emergency repairs: restore hot water and water supply, often within the hour.
- Installation & maintenance: new installations, calibration, routine servicing and system replacement options.
- Options & finance: flexible choices to suit budgets, without compromising safety or compliance.
- Commercial & strata: responsive support, documentation and ongoing service plans.
We use reputable brands and offer transparent pricing. Call us any time on 1800 571 216 for immediate help or to book a scheduled service.
| Service | Typical response | Outcome |
|---|---|---|
| Emergency hot water repair | Within the hour in metro areas | Restore supply, temporary fixes or full repair |
| Installation & replacement | Quoted same day | Code-compliant fit and calibration |
| Planned maintenance | Scheduled visits | Extended system life and compliance |
Quality materials, trusted brands and flexible service options
We source durable parts from trusted manufacturers so your hot water systems last longer and need fewer call-outs. Our focus is on compliant installation, reliable performance and clear choices for customers.
We work with recognised brands and follow Australian standards to keep your water supply safe and the installation durable.
Partnering with reputable brands to ensure durable, compliant installations
We specify and fit compliant components close to the heater with isolating and pressure-control fittings. This practice improves lifespan and reduces the risk of leaks or drift in temperature after install.
Affordable services, finance-friendly options and clear replacement choices
We offer clear replacement options, warranty details and a practical range of parts to minimise downtime. Flexible finance plans help spread costs so safety and compliance are not delayed.
- We specify and install compliant valves and components from trusted brands to maximise reliability and lifespan.
- We present clear replacement options so you understand cost, performance and warranty coverage.
- We tailor solutions to your property’s hot water demand, fixture mix and water supply characteristics.
- We offer flexible, finance-friendly arrangements to help spread upfront costs while ensuring safety.
- We verify temperatures at multiple outlets after installation to confirm compliance and comfort.
- We support both residential and commercial water systems with scalable installation and servicing plans.
Contact us on 1800 571 216 for a clear quote, expert advice on mixing valves and a practical plan that suits your budget and needs.
Conclusion
We recommend a clear plan: licensed installation, routine checks and fast response to protect your hot water supply and occupants.
Safe outlet temperatures of about 50°C and storage at 60°C or higher are achieved with approved mixing solutions fitted by a licensed plumber. Regular servicing every two years helps the mixing device last 10–15 years and keeps setpoints accurate.
We offer 24/7 emergency support and same-day attendance in many cases, often restoring service within hour. Choose from practical options and finance plans and rely on our expert team and trusted brands for durable, compliant outcomes.
Call us on 1800 571 216 for advice, inspection or urgent assistance with any hot water system concern.
FAQ
What are the safety rules and when do we need a mixing device for hot water systems in Victoria?
In Victoria, regulations require hot water outlets to be limited to safe temperatures to reduce scald risk. When a storage water heater supplies taps, we fit a mixing device to blend hot and cold water so outlets deliver around 50°C. Licensed plumbers must install and commission these devices to meet the Plumbing Code and local health requirements.
How do we stay safe and compliant with regulated hot water temperatures?
We ensure compliance by setting the heater to the recommended higher temperature for bacterial control, then fitting a certified mixing unit to reduce outlet temperatures. Regular testing, clear labelling of service points and keeping maintenance records help demonstrate compliance during inspections or rental checks.
What does a mixing device do and why does my hot water system need one?
A mixing device blends scalding hot water from the heater with cold supply water to produce a safer temperature at taps and showers. This protects vulnerable users and keeps the whole system compliant while allowing the heater to run hot enough to control bacteria such as Legionella.
How are hot and cold water blended to achieve a safe temperature?
The unit senses incoming hot and cold pressures and adjusts proportions to keep outlet temperature stable. Proper installation includes checking flow rates and temperature accuracy at a range of taps to ensure the device performs across normal household demand.
Why do storage tanks heat water to about 60°C but outlets are capped near 50°C?
We set tanks at higher temperatures to kill harmful bacteria in the stored water. Mixing devices then reduce the delivered temperature to about 50°C to prevent scalding, balancing safety from bacteria with user protection at fixtures.
Where are mixing devices fitted in a water system and how accurate are they?
We normally install the unit downstream of the hot water cylinder and before the distribution manifold. Certified devices typically hold outlet temperatures within a few degrees of the set point when correctly sized and maintained.
What do Victorian safety rules say about when a mixing unit is required?
The Plumbing Code requires protective mixing at outlets where stored hot water could cause scalding. This includes many residential settings, aged-care facilities and rental properties. Compliance depends on the type of heater and the building’s use.
Are there exceptions for some continuous flow water heaters set at 50°C?
Some instantaneous heaters can be set to deliver water at or below 50°C and may not need an additional mixing unit if the system design and usage meet code requirements. We always verify the specific appliance certification and local regulations before recommending no additional device.
Why must installation and adjustments be done by a licensed plumber?
Licensed plumbers have the training to size, install and commission these units safely and to code. They ensure correct pressure balance, anti-scald settings and durable connections, and provide compliance paperwork that homeowners, landlords or inspectors may need.
When should we fit a mixing device — during upgrades, replacements or renovations?
We install or upgrade mixing units whenever you replace a heater, extend hot water distribution, or change property use (for example, converting to multi‑tenancy). Any work that alters the hot water supply often triggers the need for updated protection to remain compliant.
Do homes with children, elderly residents or rentals need these devices?
Yes. Properties with vulnerable people or rental units face higher risk and stricter compliance expectations. We recommend certified mixing units and regular checks to keep occupants safe and to satisfy tenancy regulations and insurance considerations.
What signs indicate the mixing device needs service or replacement?
Watch for fluctuating outlet temperatures, scalding or overly cold taps, reduced flow, or leaks near the mixing unit. Any sudden change in performance after a hot‑water repair or pressure change warrants inspection by a professional.
How often should the mixing unit be serviced and how long do these devices last?
We advise annual inspections and descaling in hard‑water areas. Typical life expectancy is 8–15 years depending on water quality, usage and maintenance. Prompt repairs extend service life and maintain accurate temperature control.
What’s the difference between a basic tempering device and a thermostatic mixing unit?
Thermostatic mixing devices actively control outlet temperature using a temperature‑sensitive element for more stable results under varying pressures. Simpler units rely on pressure balance and may be less accurate during flow changes. We choose the right option based on system demands and budget.
How do we manage harmful bacteria risks while keeping water safe from scalding?
We set storage temperatures high enough to control bacteria, then use a mixing unit to reduce delivery temperatures. Periodic thermal disinfection, correct insulation and ensuring hot‑water circulation can also reduce bacterial growth without compromising safety.
How do efficiency and pressure affect system performance with a mixing device?
Correct sizing ensures minimal pressure loss and consistent temperatures. Poorly matched units can reduce flow or cause temperature swings. We assess heater output, pipework and household demand to recommend a device that maintains comfort and efficiency.
Do you offer emergency installation and repairs for hot water supply issues in Melbourne?
Yes. We provide 24/7 emergency plumbing and rapid responses for hot water failures, leaks or faults with mixing units. Our team can diagnose problems, carry out temporary fixes and schedule compliant replacements as needed.
What brands and materials do we use for durable, compliant installations?
We partner with reputable manufacturers such as Honeywell, Danfoss and Caleffi and use corrosion‑resistant materials suitable for Australian water conditions. This helps ensure long‑lasting, code‑compliant installations with reliable spare parts support.
Are service and replacement options affordable and do you offer finance?
We provide competitive quotes, transparent pricing and flexible service packages. Finance options or staged replacements are available to spread costs where appropriate. We discuss the best solution for safety, compliance and budget before starting work.
