A hot water heat pump costs around $250 to $450 a year to run, compared with $1,000 to $1,300 for a standard electric storage system. Most households recover the upfront cost through STCs, state rebates and running cost savings within three to six years.
A heat pump hot water system works like a fridge running backwards. Instead of pumping heat out of a cabinet, it pulls heat out of the surrounding air and uses it to warm the water in your tank. A small compressor and refrigerant cycle do the work, so the unit only needs enough electricity to move heat around, not to generate it from scratch.
That’s why heat pumps use 60 to 70% less electricity than a standard electric storage system for the same amount of hot water. A resistive element heats water the hard way, by converting electricity directly into heat, watt for watt. A heat pump multiplies every watt of electricity it draws into three, four, sometimes five or more watts of heat.
That multiplier is called the Coefficient of Performance, or COP. It’s not a fixed number. Budget units running on R134a refrigerant typically sit around COP 3 to 3.5. Better mid-range systems get closer to 4. Premium CO2 refrigerant systems, like those from Reclaim Energy and Panasonic’s newer range, can push past COP 5.
Higher COP means more heat generated per dollar of electricity. But that number isn’t fixed either; it’s usually quoted at a standard test temperature, and real-world performance shifts with the weather. The same unit will run at a better COP in Cairns than on a cold Canberra morning.
For a typical household of four on a 270 to 315 litre system, a heat pump costs roughly $250 to $450 a year to run on grid electricity. A standard electric storage system doing the same job costs $1,000 to $1,300 a year on a flat tariff. This is based on a household of four using around 200 litres of hot water a day (the standard 50L-per-person benchmark), a heat pump running at COP 3.5, and the AER’s 2026–27 Default Market Offer rate for Sydney/Newcastle/Central Coast (Ausgrid, 33.14c/kWh).
That’s a saving of $600 to $850 a year, just from swapping the technology and changing nothing else about how the household uses hot water.
| System | Annual Running Cost |
| Heat pump (household of 4, 270–315L) | $250 – $450 |
| Electric storage (household of 4, flat tariff) | $1,000 – $1,300 |
| Annual saving | $600 – $850 |
This comparison assumes a flat electricity tariff. If your electric storage system is already running on an off-peak controlled load rate, the gap narrows. Off-peak electricity is some of the cheapest power available, so an old electric tank on a good off-peak plan won’t cost anywhere near $1,000 a year to run. Check your actual tariff before assuming the full saving applies to you.
Fully installed, including the unit and licensed installation, a heat pump hot water system typically costs $3,500 to $5,500 in Australia, depending on the brand, tank size and the complexity of your installation, and that’s before any rebates come off the price.
It’s a higher upfront cost than a standard electric tank, which usually installs for $800 to $1,500. That gap is the single biggest reason people hesitate on heat pumps, and it’s a fair concern if you only look at the price tag.
| System | Installed Cost (Supply + Install) |
| Electric storage | $800 – $1,500 |
| Heat pump | $3,500 – $5,500 |
Say you’re replacing an old electric storage system with a mid-range heat pump. Supply and install comes to $4,200. Your installer applies the STC rebate at the point of sale, worth somewhere between $600 and $1,500 depending on your location and system size. Let’s use $900 as a realistic midpoint, with a net cost after the federal rebate of $3,300.
Your annual savings on running costs, going from an electric tank to a heat pump, sit around $600 to $850 a year. Using $700: $3,300 divided by $700 is 4.7 years.
That’s the payback period, and it’s the calculation to run for your own situation. Change any of the three inputs- install cost, rebate value, or annual savings- and the number moves. Larger households with higher hot water demand tend to pay it back faster because the annual dollar savings are bigger. Smaller households on off-peak tariffs tend to take longer, sometimes beyond the range above, because their existing electricity costs are already low.
As a rule of thumb, most Australian households land somewhere between three and six years. The system itself typically lasts 10 to 15 years, so even at the slower end of that range, you’re getting close to a decade of pure savings afterwards.
Not every household gets the same result. The households that see the fastest payback and the biggest annual saving tend to share three things:
If your household is small, already on an off-peak controlled load tariff, and your current electric tank is only a few years old, the savings will still be real, but it will take longer to show up in your pocket. It’s still usually worth doing before the tank fails anyway, since emergency replacements rarely get you the best price or the best system for your home.
Yes, but the type of heat pump matters more in colder climates than anywhere else in Australia.
Standard integrated units, where the compressor sits on top of the tank, generally operate efficiently down to around 5°C ambient temperature. Below that, efficiency drops off because there’s simply less heat in the air to extract. Split-system units, with the compressor mounted separately outdoors, extend usable operation down to around -5°C, and premium CO2 refrigerant models hold their performance better again in sustained cold.
Sydney, Brisbane, Perth and Adelaide rarely see mornings cold enough to trouble even a basic integrated unit. But if you’re in alpine Victoria, the ACT, or southern Tasmania, a split-system or CO2 model is the right call, not a standard integrated unit. Ask your installer to confirm the operating range on the specific model they’re quoting, since it varies by manufacturer and refrigerant type.
Every eligible heat pump installation in Australia qualifies for federal Small-scale Technology Certificates, or STCs. Your installer applies these as an upfront discount at the point of sale, worth roughly $600 to $1,500 depending on your climate zone and the size of the system. You don’t need to do anything to claim it yourself when it’s a supply-and-install job; your installer handles the paperwork.
On top of that, some states run their own programs:
Victoria offers a hot water rebate through Solar Victoria, worth up to $1,000 for an eligible heat pump, rising to $1,400 if you choose a locally made product. From 1 July 2026, the combined household income cap to qualify dropped to $150,000 a year, so it’s worth checking your eligibility before assuming this applies. (Source: Clean Energy Regulator, 2026 deeming period; Solar Victoria, solar.vic.gov.au, May 2026)”
NSW runs the Household Energy Saving Upgrades program under the Energy Savings Scheme, which can be stacked with the federal STC. Recent rule changes introduced a minimum customer contribution, so it’s no longer a free upgrade, and you’ll need an ESS-accredited installer to access it.
Queensland doesn’t currently run a dedicated state-wide heat pump hot water rebate. Federal STCs still apply regardless of which state you’re in, and it’s worth asking your energy retailer or local council whether any one-off offers are running, since these can appear and disappear without much notice.
| Rebate | Value | Applies To |
| Federal STC | $600 – $1,500 | All of Australia |
| Victoria (Solar Victoria hot water rebate) | Up to $1,000 (up to $1,400 for locally made) | VIC, income capped at $150,000 from 1 July 2026 |
| NSW (Household Energy Saving Upgrades / ESS) | Up to $640 (electric-to-heat pump), up to $330 (gas-to-heat pump) — stackable with STC, minimum customer contribution applies | NSW, ESS-accredited installer required |
| Queensland | No dedicated state rebate currently. This can change with little notice, so ask us to confirm current QLD funding when you get your quote. | QLD households rely on federal STC only |
Rebate values shift over time as certificate prices move and government programs get updated, so treat the figures above as a guide and confirm the current numbers with your installer before you commit.
Add up the install cost, ten years of running costs, and the rebate savings, and the gap between a heat pump and electric storage gets hard to ignore.
Over a 10-year period, a heat pump typically costs around $6,800 all-in; that’s the installed price after rebates plus a decade of running costs. Over the same period, a standard electric storage system costs closer to $13,000, made up almost entirely of running costs rather than the upfront price.
| Heat Pump | Electric Storage | |
| Installed cost (after rebates) | ~$3,300 | $800 – $1,500 |
| Running cost × 10 years | ~$3,500 | ~$11,500 |
| 10-year total | ~$6,800 | ~$13,000 |
| Saving vs electric over 10 years | ~$6,200 |
Based on a typical installation; your figures will vary depending on system size, location and tariff.
That’s a saving of roughly $6,200 over ten years for a system that costs a similar amount, or even less, to run once it’s installed. The electric tank might be cheaper on day one, but it’s the more expensive option by year three, and the gap only grows from there.
For most households replacing an electric storage system, yes. The combination of a three- to six-year payback period and $600 to $850 in annual savings makes a heat pump the cheaper option over the system’s working life, even accounting for the higher price tag upfront.
It’s a less clear-cut case if you’re in a small household already on a cheap off-peak tariff, since the existing running cost is already low and the savings will take longer to show up. It’s also not the right fit for apartments without outdoor installation space, or for rental properties where the tenant, not the owner, benefits from lower bills.
For everyone else, particularly larger households on a flat tariff running an ageing electric tank, a heat pump is the system that pays for the switch and then keeps paying you back for the next decade.
Ready to see what a heat pump would cost for your home? Get in touch with our team for a same-day quote, and we’ll factor in your current system, your household size, and any rebates you’re eligible for.