Not every change means the whole system is failing, but repeated or worsening symptoms should not be ignored.
Hot water runs out sooner
A noticeable reduction in available hot water can point to a thermostat, element, burner, sediment or capacity issue. First consider whether household demand has changed.
Water is no longer consistently hot
Fluctuating temperature or slow recovery can indicate a control, heating or system-performance problem. Describe when the change occurs and whether every hot tap is affected.
Moisture or corrosion appears around the unit
Water around valves or connections may be repairable. Rust, tank corrosion or water escaping from the cylinder itself can be more serious. Do not touch hot pipework or electrical components.
New noises or discoloured water
Popping, rumbling or banging may relate to sediment, pressure or components. Rust-coloured hot water can indicate corrosion or another water-quality issue requiring investigation.
The system needs repeated repairs
When faults recur, compare the cost and likely benefit of another repair against replacement. Ask what the repair is expected to achieve and whether other ageing components remain.
Gas smells, smoke, sparking, exposed wiring or significant flooding need urgent professional attention. Keep people away and contact the appropriate emergency or licensed service.
Record useful details
Photograph the unit and label from a safe distance. Note the suburb, symptoms, approximate system age, when the issue began and whether the problem affects all outlets.