Gas vs Electric vs Heat Pump vs Solar: Choosing a System
Choosing a hot water system is a four-way contest where every contender wins somewhere — which is why "what's the best hot water system?" has no honest one-word answer, only an honest one-question answer: best for whose house? Here's the full comparison, then straight recommendations by situation, so you can stop reading and start showering.
The Contenders, Compared
| Electric storage | Gas | Heat pump | Solar + booster | |
|---|---|---|---|---|
| Installed cost | $1,200–$2,200 | $1,400–$3,000 | $2,500–$5,500 before rebates | $4,000–$7,000+ |
| Running cost | Highest | Medium | Low (≈⅓ of electric) | Lowest |
| Lifespan | 8–12 yrs | 8–12 / 15–20 yrs | 10–15 yrs | 15–20 yrs |
| Rebates | None | None | Strong (VEU + STCs) | Strong |
| Recovery speed | Slow | Fast / instant | Slower | Weather + booster |
Electric Storage: The Honest Baseline
Cheap to buy, simple, reliable — and the most expensive system on the page to run at full grid prices. Its two redemptions: off-peak tariffs (big tank, overnight heating, decent economics) and solar PV with a timer, which turns midday sun into hot water. Buy it when budget is absolute, the household is small, or as a like-for-like landlord swap where minimal fuss wins — but read the heat pump case first, because rebates have narrowed the gap to the point where buying resistive electric in Victoria needs a reason.
Gas: Fast Recovery, Fading Economics
Gas continuous-flow remains the recovery-speed champion — endless hot water, compact box, 15–20 year life — and gas storage is a fine workhorse. The headwinds are structural: gas prices have trended up, daily supply charges make small-usage gas homes question the connection entirely, and new gas connections face increasing policy friction in Victoria. Buy gas when you're already a committed gas household with high simultaneous demand (big family, multiple bathrooms), or when replacement speed and footprint rule. Think twice if hot water is the only thing keeping a gas meter on the wall — the supply charge alone can exceed a heat pump's entire running cost.
Heat Pump: The Default Answer in 2026
Roughly a third the running cost of electric storage, heavily rebated in Victoria (see the rebate guide), gas-free, and solar-PV synergistic. The caveats are placement noise, winter efficiency dips (solved by buying a climate-rated unit), and a quality spread that punishes bargain hunting. For most Geelong homes replacing an electric tank, this is the recommendation — the full pros-and-cons treatment is in our heat pump guide.
Solar Hot Water: Champion Runner, Premium Ticket
Roof-mounted solar thermal delivers the lowest running costs and long lifespans, with rebate support easing the entry price. But it competes against a subtle rival: solar PV + heat pump often achieves similar economics with more flexibility (PV electricity can run anything, not just water). Solar thermal suits high-usage households with good north roof space and a long ownership horizon; the PV + heat pump combination suits nearly everyone else asking the same question.
Recommendations by Situation
- Replacing a dead electric tank in Geelong: heat pump, rebated. This is the layup.
- Gas household, two+ bathrooms, teenagers: gas continuous flow — recovery speed is your bottleneck.
- Have (or getting) solar PV: heat pump on a daytime timer; your panels become your water heater.
- Tight budget, small household, rental swap: electric storage on off-peak — but price the rebated heat pump before signing; the gap may be smaller than the running-cost difference.
- Leaving gas entirely: heat pump closes the loop.
- High usage, great north roof, staying 15+ years: solar thermal earns its premium.
Whatever You Choose: Three Universals
Size for the household you have (undersizing is the eternal regret — sizing tables in the cost guide); insist on licensed installation with a compliance certificate; and if your current system is 10+ years old, decide before it fails — every option on this page is cheaper chosen calmly than chosen in a towel at emergency rates.
The Question Behind the Question
When people ask "which system is best," they're usually really asking "which decision won't I regret?" The regret patterns are predictable: undersized tanks (regretted daily), bargain no-name heat pumps (regretted at year four), gas connections kept alive for one appliance (regretted quarterly, on the bill), and emergency purchases (regretted immediately, at after-hours rates). Every one of those is avoided by deciding early, sizing up, and buying quality from a licensed installer with the rebates itemised. The technology choice matters less than the buying process — get the process right and all four systems on this page will serve you honourably.
And a final Geelong-specific footnote: coastal and Bellarine homes should factor salt exposure into outdoor unit placement regardless of type — sheltered positioning and marine-grade fittings add years, a lesson every seaside gutter has already taught its owner.
Still Torn Between Two Systems?
Describe your household and current setup — get a straight recommendation with real installed prices (rebates itemised) instead of a brochure. Same-day replacement across Geelong when the decision has been made for you.
📞 Call 0491 570 006FAQs
What is the best hot water system in Australia?
There's no universal winner: heat pumps are the best value for most homes replacing electric storage (especially with Victorian rebates), gas continuous-flow wins for large simultaneous demand, and solar suits high-usage long-term owners.
Is gas or electric hot water cheaper to run?
Gas has traditionally beaten full-tariff electric storage, but heat pumps now undercut both — roughly a third of electric storage's running cost. Gas economics also suffer if hot water is the only appliance justifying the daily supply charge.
Should I replace gas hot water with electric?
If electric means a heat pump, often yes — especially if you're considering leaving gas entirely, where removing the daily supply charge adds to the savings. Like-for-like resistive electric is rarely the right swap from gas.
Is solar hot water worth it compared to solar panels plus a heat pump?
Solar thermal has the lowest running costs, but PV plus a heat pump often matches the economics with more flexibility, since PV electricity is not limited to heating water.
Related guides: Heat pump hot water guide · Victorian rebates · Hot water system costs