Typical lifespans
| System | Typical life |
|---|---|
| Electric storage | 8 to 12 years |
| Gas storage | 8 to 12 years |
| Heat pump | 10 to 15 years |
| Gas continuous flow | 15 to 20 years |
| Solar | 15 to 20 years |
How to tell how old yours is
Check the compliance label on the side of the unit. It shows the manufacture date, or a serial number the manufacturer can date for you.
Signs it's near the end
- Water leaking from the tank body or pooling underneath.
- Rust on the casing or rusty hot water.
- Rumbling or popping noises from sediment.
- Repeated repairs in the last year or two.
What shortens a system's life here
Salt air near the beach corrodes outdoor valves and casings. Rainwater and bore water use up the anode faster. High water pressure strains the tank and valves.
How to make it last longer
Follow your owner's manual. Many manufacturers recommend easing the relief valve every six months and an anode check around five years (sooner on tank water). If your water pressure is high, a pressure limiting valve helps. See hot water servicing.
If yours is past its typical life, read repair or replace before spending money on a major repair.
Common questions
How long does an electric hot water system last?
Usually 8 to 12 years. Anode and relief valve maintenance helps it reach the upper end of that range.
Should I replace my hot water system before it fails?
If it's past its typical lifespan, planning a replacement avoids a cold-shower emergency and gives you time to compare options like a heat pump.
Sources and further reading
- Business Queensland: hot water systems (temperature control devices on new and replacement systems)
- QBCC: Form 4 notifiable work (installing, replacing or removing a water heater)
- Clean Energy Regulator: solar water heaters and air source heat pumps (STC eligibility)
- Residential Tenancies Authority: emergency and routine repairs