How Long Do Hot Water Systems Last?
- 1 Electric storage: 8-12 years
- 2 Gas storage: 8-12 years
- 3 Gas continuous flow (instantaneous): 15-20 years
- 4 Heat pump: 10-15 years
- 5 Solar hot water: 20+ years (collector panels may last longer than the cylinder)
When to Replace (Not Repair)
If your system is more than 10 years old, it's usually more cost-effective to replace than repair when it fails. A new system will be more efficient, have a full warranty, and not leave you with the same failure point. Get a quote for both repair and replacement — the cost difference is often small for older units.
Government Rebates
Heat pump hot water systems attract rebates via the Small-scale Renewable Energy Scheme (STCs) in every state — this typically reduces the installed cost by $300–$700. State-specific rebates add further discounts: VIC's Hot Water Rebate offers up to $1,000 for heat pump systems. Check energymadeeasy.gov.au for current rebates.
Pro tip: If your old system is gas and you're considering switching to heat pump electric, the savings from removing the gas connection fee ($200-400/year in supply charges) can be significant over time.
Emergency Replacement Considerations
If your system has failed and you have no hot water, a licensed plumber can typically replace a standard gas or electric system within 24 hours using a from-stock unit. Heat pump systems may need 1-2 days for delivery. A specialist solar system takes 1 week to 4 weeks depending on availability and roof work.
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