A leaking hot water system is urgent if water is spraying, flowing beyond control, very hot, near electrical equipment or accompanied by gas odour. Keep people away from pooled water, wet electrical parts and hot discharge. Call 000 from a safe place for fire, explosion, uncontrolled gas release or another immediate threat to life or property. If there is no immediate danger, identify the apparent water source without touching or opening the system and arrange prompt assessment.
Check the danger before approaching the unit
Do not assume the first step is to reach the switchboard or a valve. The safe response depends on the hazard and the type of heater.
- Shock or tingle: follow the Queensland Electrical Safety Office shock and tingle advice: stay clear of the appliance, taps, metal fittings, switchboard and meter box, warn others and contact the electricity distributor immediately. A licensed electrician may also be required.
- Gas odour: follow the Queensland Government gas safety directions. Do not use a flame or operate electrical switches or devices. Move away and contact the gas supplier or a licensed gasfitter from a safe location. Call 000 for fire, explosion or an uncontrolled release.
- Hot or spraying water: keep clear of the unit and its discharge point. Turning off a supply does not instantly cool stored water or remove pressure.
- Water near live equipment: do not cross the wet area to reach a control. The separate guide to water leaks affecting electrics explains the electrical safety boundary.
Move belongings or contain water only if you can do it without entering the hazard area or touching hot, wet, gas or electrical equipment.
Is the water normal discharge or a fault?
Water near a heater does not always come through the tank wall. It may be leaving a pressure and temperature relief drain, a condensate drain, a safe tray, a visible connection or nearby pipework. Some storage heaters release a small amount through their relief drain during heating, and some heat-pump or high-efficiency gas systems produce condensate in normal operation.
The exact heater manual matters because the expected pattern and drain arrangement vary by model. Manufacturer guidance, including the Dux troubleshooting guide, distinguishes possible normal relief discharge or condensate from larger or persistent water release. A continuous relief flow, spraying, an overflowing safe tray, water from the cylinder body or fittings, or pooling that cannot be explained by the normal drain path needs a licensed assessment. The hot water relief valve guide covers the difference between expected discharge and signs of a problem.
Never plug, cap or obstruct a relief outlet. It is a safety device and its water can be hot. Do not remove covers, tighten connections, release pressure or try to drain the cylinder.
What can you safely do?
From a dry position, note whether the water is dripping, flowing or spraying and whether it appears only while the heater is operating. Read the make, model and system type without removing a cover. Photograph the apparent source from a safe distance and note when the leak began and whether its pattern changes.
Use only the shutdown instructions for that exact model. Electric, gas, solar, heat-pump, storage and continuous-flow systems do not share one safe isolation sequence. Operate a control only when the manufacturer directs a householder to use it, it is clearly identified, and it can be reached without crossing water or contacting hot or wet equipment. If any of those conditions are missing, wait for the appropriate licensed trade.
Do not reset the system after water has reached electrical or gas components. If the heater has also stopped working, the guide to safe hot water observations explains what can be recorded without opening the unit.
Who should attend?
The QBCC regulated-work guidance confirms that regulated plumbing work needs an appropriately licensed plumber or drainer. A licensed plumber can identify whether the water is coming from the heater, relief assembly, valves or connected pipework and carry out the work within licence scope. Gas-side faults require an appropriately licensed gasfitter. Wet wiring, electrical controls, a shock or a tingle require the electricity distributor or a licensed electrician, depending on the fault. A manufacturer service agent may be needed for model-specific diagnostics or warranty procedures.
Once immediate gas, electrical and scald hazards are controlled, book hot water system repairs for continuous discharge, tank or fitting leakage, an overflowing safe tray or unexplained pooling around the unit.