A hot water system needs regular checks for leaks, corrosion, obstructions and unusual operation, plus servicing at the intervals specified by its manufacturer. Storage systems may require relief-valve testing, sediment assessment and sacrificial anode replacement; continuous-flow, heat-pump and solar systems have different service requirements.
Safe checks for householders
You can safely:
- Look for water beneath the unit, damp fittings, rust, staining or damaged exposed pipework.
- Listen for new or unusual noises.
- Keep the appliance accessible and clear of stored items.
- Ensure ventilation openings and flues are not obstructed, without removing covers or adjusting components.
- Check the manual and service records to see when maintenance is due.
Do not dismantle fittings or work on plumbing, gas, electrical or internal components. Hot water systems contain pressurised, potentially scalding water and may involve gas or mains electricity.
Maintenance requiring a professional
| Task | What it involves |
|---|---|
| Relief-valve check | The temperature and pressure relief valve protects a storage tank from excessive temperature or pressure. Operate its easing lever only if the manufacturer instructs you to and the discharge cannot scald anyone; otherwise, use a licensed plumber. |
| Sediment assessment | A plumber can determine whether the storage tank needs flushing. Do not drain or flush a hot water tank yourself. |
| Sacrificial anode inspection | Many enamel-lined storage tanks use an anode to protect the tank from corrosion. Inspection and replacement timing depend on the model. |
| Continuous-flow servicing | Model-specific servicing may cover filters, burners, heat exchangers and safety controls. This requires a suitably qualified technician. |
| Heat-pump or solar servicing | These systems have additional electrical, refrigeration or roof-mounted components that require appropriately qualified tradespeople. Do not access roof-mounted equipment yourself. |
A small amount of relief-valve discharge during heating can be normal for some storage systems. Continuous discharge, substantial leaking or dangerously hot discharge needs prompt professional assessment. Keep people away from the outlet.
If you smell gas, avoid flames and electrical switches, leave the area and contact the gas emergency service or a licensed gasfitter. Do not touch wet electrical equipment or surrounding water. Call 000 if there is immediate danger.
How often is maintenance needed?
Follow the manual for the exact model because there is no universal service interval.
- Regularly: Check for leaks, corrosion, damage, obstructions and abnormal operation.
- As manufacturer-directed: Test an accessible relief valve only where the manual permits and you can avoid the hot discharge safely.
- At the specified service interval: Arrange professional servicing and any applicable anode or sediment assessment.
- Earlier: Seek an assessment if the system is leaking, operating abnormally or has an unknown service history.
Keep the manual, warranty information and service records available. If servicing is due or you find deterioration, our Sydney plumbing team can inspect the system and confirm the maintenance required.