Storage stays at 60°C, bathrooms get 50°C, and both rules matter
The two numbers confuse people because they pull in opposite directions. Water stored below about 60°C creates conditions where Legionella bacteria can multiply, so storage systems must hold at least 60°C. But 60°C water scalds skin in seconds, so the water delivered to fixtures used for personal hygiene, your bathroom basins, showers and baths, must arrive at no more than 50°C. The device that reconciles the two is the tempering valve, which blends cold water into the hot line so the tank stays hot enough to be safe from bacteria while your shower cannot get hot enough to cause serious burns.
Queensland's required temperatures at a glance
| Location or system | Required temperature | Why |
|---|---|---|
| Storage tank | 60°C minimum | Controls Legionella growth in stored water |
| Bathroom taps, showers, baths | 50°C maximum delivery | Scald protection, achieved via tempering valve |
| Early childhood, aged care, healthcare facilities | 45°C maximum delivery | Higher-risk users, thermostatic mixing valves |
| Kitchen and laundry taps | May receive full temperature | Not sanitary fixtures, appliances often want hotter water |
| Continuous flow units in many homes | Often preset to 50°C delivery | Some units temper internally, no storage volume |
Scalding is fast at higher temperatures, which is the point of 50°C
At 60°C, hot water can cause a serious burn to adult skin in around a second. At 50°C that time stretches to several minutes, which is enough for a child or an older person to pull away or be helped. Children and the elderly have thinner skin and slower reactions, which is why the delivery cap exists and why facilities caring for them are held to 45°C. This is not a nanny rule. Scald injuries from domestic hot water still put Queenslanders in hospital, and the tempering valve is the cheap, passive device that prevents most of them.
Turning the thermostat down to save money is the wrong lever
Every winter someone suggests dropping the tank thermostat to 50°C to cut bills. On a storage system, do not. You save a little standby heat and in exchange you park your stored water in the Legionella comfort zone. If running costs are the problem, the honest answers are a tempering valve check, better system sizing, moving to off-peak electric operation, or a more efficient system such as a heat pump, which runs $2,500 to $4,500 installed after rebates on the Gold Coast as of 2026. Continuous flow gas units are the exception to the storage rule, they hold no stored volume, which is why they can legitimately deliver at lower setpoints.
Older homes often have no tempering valve at all
Tempering valves became standard practice in the late 1990s and are required when a hot water system is installed or replaced. The result is a generation of older Gold Coast homes running untempered 60°C or hotter water straight to the bathroom. We find them every month, usually when we are on site for something else. If your hot tap water is painful within a second or two, get it checked. Tempering valves also wear out, typically after 5 to 8 years the internal element drifts and delivery temperatures creep up or fall so low your shower goes lukewarm. Replacement or adjustment is quoted on inspection.
Adjusting all this is licensed work in Queensland
Setting a tempering valve, replacing one, or working on the heated water service is plumbing work that must be done by a licensed plumber under Queensland law. The thermostat behind an electric tank's cover plate also sits next to mains wiring, which is its own reason not to open it yourself. We are QBCC licensed (licence 15243081), we test the actual delivery temperature at your taps with a thermometer rather than guessing, and we leave the system both compliant and comfortable.
If your hot water feels scalding, lukewarm, or you simply do not know whether a tempering valve exists in your home, call Hills Plumbing & Gas on 0472 657 042. Fixed price quoted before any work, honest ETA given on the call, Gold Coast wide. Start at our hot water systems page.
Sources: Queensland Plumbing and Drainage Act 2018 and Plumbing and Drainage Regulation 2019; AS/NZS 3500.4 (heated water services); Queensland Development Code MP 4.1 requirements for heated water temperature control.