iStore Heat Pump Hot Water: What It Costs and How the VIC and NSW Rebates Work
Hot water is quietly one of the biggest line items on an Australian power bill, and it's also one of the easiest to fix. Here's what an iStore heat pump actually costs once the Victorian and NSW rebates are applied, and what's worth checking before you commit.
Why Hot Water Is Worth a Second Look
Hot water is one of the biggest single energy users in an Australian home. Government sources put it at somewhere between 15 and 30 percent of household energy use, which makes it one of the few upgrades that can meaningfully move the needle on a power bill. If your current system is an old electric tank or running on gas, a heat pump is generally the biggest efficiency gain available, because it pulls heat from the surrounding air rather than generating it directly.
There's also a deadline worth knowing about if you're on gas: from 1 March 2027, existing Victorian homes will need to replace a gas hot water system with an efficient electric alternative, like a heat pump, once it reaches the end of its working life. It's not a reason to replace a perfectly good system early, but it's worth factoring in if yours is already on its way out.
iStore is the heat pump brand our team installs, and it's a well-regarded one. In the 2026 Installer's Choice Awards run by SolarQuotes, iStore was the clear favourite among Australian solar and hot water installers surveyed, picked by 63% of respondents, nearly two in three. That's a strong signal from people who install these units for a living, not just marketing.
What Actually Affects the Cost
There's no single number for what a heat pump hot water system costs, because it depends on your household and your existing setup. The main factors are:
Tank size: iStore's range covers a 180L unit, generally suited to one to three people, and a 270L unit for larger households.
What you're replacing: swapping an existing electric tank for a heat pump is usually the more straightforward job. Moving off gas, or installing where there's no existing hot water system, can involve more electrical or plumbing work.
Access and installation complexity: where the unit goes, ventilation requirements, and whether your switchboard needs any changes.
Because of that variation, the only reliable way to know your actual cost is a tailored quote for your property. What we can be specific about is how much the rebates below typically reduce the upfront investment by, and how the Victorian and NSW schemes differ.
How the Rebates Work: Victoria
Victoria stacks three incentives on top of each other:
Federal Small-scale Technology Certificates (STCs): eligible heat pumps earn STCs, which your installer converts into an upfront point of sale discount. As a guide, CBR's current estimate for an iStore system is around $500, though the exact value moves with the certificate market and your specific climate zone.
Victorian Energy Upgrades (VEU): a further discount is often available when you're replacing an inefficient electric or gas system, applied by a VEU-accredited retailer or installer.
Solar Victoria Hot Water Rebate: a rebate of up to $1,000 is available for eligible householders. Combined, the VEU and Solar Homes rebate alone can reduce the upfront cost by up to $1,400 for a system like iStore, before STCs are even factored in.
To qualify for the Solar Victoria rebate, you need to be an owner-occupier of a property valued under $3 million, your household's combined income needs to be $150,000 or under (this cap dropped from $210,000 on 1 July 2026), the system you're replacing needs to be at least three years old, and the rebate isn't available for new builds.
One clarification worth making: there's a separate, larger Victorian Energy Upgrades activity aimed at commercial and industrial heat pump systems (minimum 700 litre tanks), which had significant eligibility changes take effect from 31 March 2026. That's a different mechanism to the residential hot water discount above, and doesn't apply to a household-sized unit like the iStore 180L or 270L, worth knowing if you've seen the two mentioned together.
How the Rebates Work: NSW
NSW takes a simpler approach. There's no household income test for the main incentive, which is a genuine point of difference from Victoria.
Federal STCs apply the same way as in Victoria, as an upfront discount calculated by your installer.
NSW Energy Savings Scheme (ESS): administered by IPART, this provides a further upfront discount that shows up directly on your installation quote. It isn't a rebate you claim separately, it's built into the price your installer gives you.
Some NSW households can also spread the remaining balance through the NSW Home Energy Saver interest-free loan, which covers eligible heat pump upgrades up to $15,000 over a term of up to 10 years with no interest.
Common Misconceptions
“It needs a new dedicated electrical circuit.” Not necessarily. Depending on the model, some heat pump hot water systems can run on an existing circuit, while others need one dedicated to the unit.
The bottom line: your switchboard, your model, and your homes setup all factor in, which is exactly why an on-site assessment beats a general rule.
“The rebates work the same everywhere.” They don't. Victoria's Solar Homes rebate is means-tested and tied to a specific eligible-product list; NSW's ESS discount isn't income-tested and is applied differently, at the point of quote rather than as a separate claim.
“Any old hot water system qualifies.” In Victoria, the system you're replacing generally needs to be at least three years old, and new builds aren't eligible for the Solar Homes hot water rebate. It's worth checking eligibility before assuming a rebate applies.
Getting More Value If You Already Have Solar
Most heat pumps, including the iStore range, let you set a timer so the unit runs during the middle of the day rather than overnight. If you've already got solar, lining that window up with when your panels are generating means more of your hot water is effectively heated using power you're already producing, rather than power you're buying. Our team can help set this up as part of your installation.
Is It Worth It?
For a household replacing an old, inefficient electric tank, especially one that already has solar, a heat pump is one of the more straightforward efficiency upgrades available. It uses meaningfully less energy to do the same job, and between the federal, state and (in NSW) upfront ESS incentives, the gap between the sticker price and what you actually pay is usually substantial.
For a full picture of how the numbers stack up for your household, our team can walk you through eligibility and current incentive values as part of our Rebates & Incentives guide, alongside a quote for your property.
Next Steps
If your hot water system is ageing, running on gas, or just costing more than it should, it's worth finding out what a heat pump would look like for your household. Our team is NETCC accredited and we can talk you through current eligibility and rebate settings for your specific circumstances. We don't promise a specific saving figure upfront, because it genuinely depends on your household, but we're happy to work through the numbers with you. Get in touch to find out more.