With gas prices rising and government rebates making heat pumps more accessible, this is the hot water decision most Australian homeowners are wrestling with right now. Heat pumps cost more upfront but dramatically less to run. Gas is cheaper to install but running costs are climbing fast. Here's the full picture.

$2,500–$4,500
Heat pump — supply & install
$900–$2,000
Gas storage — supply & install
$400–$1,400
Government rebates available (varies by state)

Heat Pump Hot Water Cost

A heat pump water heater works like a reverse air conditioner — it extracts heat from the air to heat water, using just 25–33% of the electricity of a conventional electric system.

System / CapacityInstalled CostAfter Rebates (est.)
270L (1–3 people)$2,500–$3,200$1,800–$2,500
315L (3–5 people)$3,000–$3,800$2,200–$3,000
400L (5+ people)$3,500–$4,500$2,500–$3,500
Rebates vary by stateVIC, NSW, QLD, SA and WA all have active rebates for heat pump hot water as of April 2026. Check the federal energy rebates portal for your state's current offer — amounts change frequently.

Gas Hot Water Cost

Gas storage and instant (continuous flow) systems remain cheaper to purchase and install, but running costs have risen significantly with gas price increases since 2022.

System TypeInstalled CostAnnual Running Cost
Gas storage (135L)$900–$1,500$400–$700
Gas instant / continuous flow$1,200–$2,000$350–$600
Heat pump (for comparison)$2,500–$4,500$150–$300

10-Year Total Cost of Ownership

This is where heat pumps decisively win. For a family of 4 in Sydney:

Gas storage
~$7,200 over 10 yrs
Gas instant
~$6,500 over 10 yrs
Heat pump
~$4,800 over 10 yrs

Based on $1,400 install saving for gas vs heat pump, $500/yr gas vs $200/yr heat pump running costs.

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Which Should You Choose?

Choose a heat pump if…You have solar panels (run the heat pump during the day on solar), want to lower your bills long-term, your home has space for the outdoor unit, and you qualify for a state rebate.
Choose gas if…You already have a gas connection and your new system is a like-for-like replacement, you're renting out the property, or the upfront cost difference is a genuine barrier.
Think twice before new gasIf you don't currently have a gas connection, connecting one costs $1,500–$3,500 on top of the system price. At that total cost, a heat pump almost always wins on lifetime value.

Frequently Asked Questions

Can a heat pump work in cold climates like Canberra or Hobart?

Yes — modern heat pump hot water systems operate efficiently down to around -5°C. In very cold climates the efficiency drops slightly (from ~3.5x to ~2.5x) but they still run at 250% efficiency vs 100% for a gas system. Look for models rated to -7°C.

How long does a heat pump hot water system last?

10–15 years for most brands. Rheem, Sanden, and Reclaim Energy are consistently rated highest for Australian conditions. The compressor is the component most likely to fail — budget $400–$800 for a replacement compressor after 10 years.

Is a gas instant system better than storage?

Instant (continuous flow) gas heats water on demand and wastes nothing on standby heat loss, making it 15–20% more efficient than gas storage. If you're staying with gas, instant is generally the better choice for a family of 3+.

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