Hot Water Systems Australia — 2026 Comparison & Costs
Hot water is the biggest single energy cost in most Australian homes — about 21% of household energy use. Here's how every system compares in 2026.
Hot water system comparison (4-person home)
| System | Install cost | Annual running | After rebates |
|---|---|---|---|
| Heat pump | $3,000–$5,500 | $100–$300 | $1,000–$2,500 |
| Solar (electric boost) | $3,500–$6,000 | $150–$400 | $1,500–$3,500 |
| Gas instantaneous | $1,400–$3,200 | $350–$700 | no rebates |
| Gas storage | $1,200–$2,800 | $400–$800 | no rebates |
| Electric storage (off-peak) | $900–$2,200 | $400–$700 | no rebates |
| Electric storage (peak) | $900–$2,200 | $700–$1,300 | no rebates |
Running costs assume 200 L/day hot water demand and 2026 average tariffs. Add ~$300/year supply charges if installing gas just for hot water.
Pick a heat pump if…
- • You have rooftop solar PV
- • You want the lowest running cost
- • You're going all-electric
- • Outdoor install space is available
Pick solar hot water if…
- • North-facing unshaded roof
- • No existing PV system
- • Long-term hold (15+ years)
- • Warm climate (QLD/NSW/WA)
Get quotes from local installers
Compare hot water installers in your area — heat pump, solar, and conventional — all rebate-eligible.
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