How Hot Is Tap Water in Australia? (Safe Temps + Standards)

Short answer: In Australia, storage hot water must be kept at least 60C to control Legionella, but bathroom taps are limited to a safe maximum of 50C in homes (45C in childcare, hospitals and aged care). Kitchen and laundry taps are typically allowed to be hotter. If youre wondering how hot is tap water in Australia, thats the balance  hot in the tank, safe at the outlet.

The Australian rules for hot water temperatures

The requirements come from the Plumbing Code of Australia and AS/NZS 3500.4 (Heated water services). In practice, that means:

• Storage temperature: Water in a storage heater (electric, gas, solar, heat pump) must be kept at 760C or higher to inhibit Legionella bacteria.
• Bathroom outlets (domestic): Showers, baths and hand basins must be tempered to 50C maximum.
• High-risk buildings: Max 45C for childcare, schools for young children, hospitals, and aged care.
• Kitchen and laundry: Not required to be tempered by the standard. Many homes deliver hotter water (often 55 60C+) at these taps.
• Continuous flow (instantaneous) heaters: No storage means no 60C storage rule, but delivery limits still apply to bathrooms. Many units are factory set around 50 55C and can be adjusted by a licensed plumber or via controllers.

To meet these limits in homes with a storage tank, plumbers fit a tempering valve at the heater to blend hot and cold so your bathrooms get 50C max, while the tank itself stays 60C+.

Why 60C in the tank but 50C at the tap?

Legionella control: The bacteria that cause Legionnaires disease thrive in warm, stagnant water between ~20 50C. Keeping stored water at 60C or running periodic boost cycles to 60C (common in solar and some heat pump systems) suppresses them. Thats why turning a storage tank down to 50C is unsafe.

Scald safety: At 60C, serious burns can occur in under 5 seconds; at 55C, under a minute; around 50C, several minutes. Limiting bathrooms to 50C greatly reduces the risk, especially for children and older people with thinner skin.

Comfortable temperatures for showers and baths

• Showers: Most adults prefer 37 41C. Hotter than 43C can feel uncomfortably hot and dry your skin.
• Baths for kids: Aim for about 37C (body temperature). Always test with your elbow or a bath thermometer first.
• Hand washing: Warm water is fine; temperature matters less than using soap and washing time.

How to check your tap temperature

You dont need special equipment  a simple cooking or fridge thermometer works.

1. Pick the bathroom basin tap (thats the one legally required to be 50C max in homes).
2. Run the hot tap on full for 60 120 seconds to stabilise.
3. Hold the thermometer in the stream (or in a cup you fill) until the reading stops changing.
4. Record the peak temperature. Repeat at the shower and kitchen for comparison.

What you should see: Bathrooms usually sit just under 50C. Kitchens can be higher (often 55 60C+) unless youve had them tempered as well.

Too hot or too cold? A practical fix-it checklist

Start with the most likely causes first. For anything involving gas, electrical covers, or sealed components, use a licensed plumber/gasfitter.

Water too hot at bathroom taps (over 50C)

• Tempering valve slipped or failed: The small mixing valve near the water heater can drift or seize. Ask a plumber to test/adjust; many recommend annual checks and replacement every 5 8 years.
• Continuous flow set too high: If you have an instantaneous unit with controllers, check the setpoint. Set to 50C for bathrooms. Some units allow a higher kitchen setpoint via a second controller or bypass.
• Incorrect plumbing of mixers: Renovations can bypass tempering to a basin by mistake. A plumber can trace and correct the pipework.

Water too cool or fluctuating in bathrooms

• Tempering valve clogged with scale: Common with hard water. Cleaning or replacing the valve usually fixes lukewarm or pulsing temps.
• Solar/heat pump not boosting to 60C: Check the controller is scheduling a regular anti-legionella or booster cycle. If unsure, a plumber can verify.
• Continuous flow minimum-flow issue: Some shower heads are so efficient that flow drops below the heaters ignition threshold. Try a higher-flow setting or have the unit serviced.
• Thermostat/element fault (storage): Electric tanks with a failing element or thermostat will run cool. Dont open the cover yourself; call a licensed electrician/plumber.

Kitchen/laundry too hot

• Add tempering or a TMV to those outlets: Not mandatory in homes, but a plumber can temper the kitchen to ~55C for usability while keeping the tank at 60C+.
• Use mixer technique: Run some cold first, then dial in hot. Never put hands directly under a newly opened hot tap.

Tempering valves vs thermostatic mixing valves (TMVs)

• Tempering valve: A mechanical mixer fitted at most homes to cap bathroom temps at 50C. Reliable and economical, but not as precise at very low flows.
• Thermostatic mixing valve (TMV): Required in care and medical settings (45C max). More accurate and reacts faster to fluctuations. In regulated facilities they must be tested regularly by a licensed plumber with TMV accreditation.

If your home needs tighter control (e.g., for vulnerable occupants), ask a plumber whether upgrading to a TMV at bathroom groups makes sense.

Special cases: solar, heat pumps, and continuous flow

• Solar hot water: Tanks can exceed 60C on sunny days. Thats fine (and efficient), provided bathroom outlets are tempered to 50C. Many systems run scheduled boosts to ensure pasteurisation during cloudy periods.
• Heat pump: Some models heat to 55C daily and run periodic boosts to 60C. Verify the anti-legionella cycle is enabled.
• Continuous flow (gas or electric instantaneous): You set the delivery temperature. 50C is a safe whole-of-home setpoint for families; if you want hotter water at the kitchen, ask about dual controllers or a kitchen bypass while keeping bathrooms at 50C.

Rentals and compliance

Rental properties must comply with current plumbing safety standards. That means bathroom outlets should be tempered to 50C and hot water systems must be installed and maintained by licensed trades. If you measure significantly above 50C at a bathroom tap, report it to your property manager and request a licensed plumber to inspect the tempering valve and system.

Safety habits that matter

• Test bath water with your elbow or a bath thermometer before children get in.
• Open cold first, then add hot; close hot first when turning off.
• Fit anti-scald devices on bath taps if you care for young children or older adults.
• Have your water heater and tempering valve serviced regularly (check, clean, and replace valves as needed).

Bottom line: Store hot, deliver safe. Keep storage at or above 60C to protect against bacteria, make sure bathrooms are tempered to 50C (45C in care settings), and tune kitchens for practicality. If your readings dont match, a licensed plumber can quickly bring your system back into line.