Heat Pump Hot Water Rebates in SA: What You Can Actually Claim

The 3 schemes, and how they stack

People search for the heat pump rebate as though it is a single thing. It is not. There are 3 separate programs operating at 3 different levels of government, run on completely different mechanisms, and they can be claimed together on the same installation.

The structural point: none of these is a payment to you. Each is a discount arriving via the installer, which is why the installed price you are quoted is the only number that means anything. Quotes that both say "after incentives" can differ widely on the same unit, and the incentive is rarely what differs.

Site work moves the installed price more than the schemes do, and it is invisible until someone looks. A dedicated electrical circuit, a compliant drain to a legal discharge point, relocating the unit because the old position has no airflow, a long carry down a narrow side passage, or a switchboard upgrade all add real work. Marc looks at all of it on site, and the price is discussed before the work starts.

REPS: how it really works

The Retailer Energy Productivity Scheme is a South Australian government scheme, and it is not a grant program. It places an energy-saving obligation on energy retailers, and the retailers meet that obligation by funding accredited providers to deliver efficiency upgrades in homes and small businesses. Your heat pump installation creates a measurable energy saving, that saving is credited to a retailer, and in exchange the cost of the upgrade to you is reduced.

The practical consequence is that you never see a REPS payment, and there is no form for you to lodge afterwards. If you are told to install first and claim later, that is a misreading of the scheme.

• The value depends on the gas status of the property. A property that stays connected to natural gas attracts a materially smaller discount than a property with no gas connection, or one where the gas is disconnected on the same day as the installation.
• The value also varies with the activity, the climate zone and the specific model installed.
• A once-off site fee applies per site, and it is small. It exists to fund the scheme administration.
• Eligibility depends on what is being replaced, not just on what is being installed. Swapping an external continuous flow gas unit or an ageing electric-boosted solar system is a common eligible activity.
• The scheme entered a new phase for 2026 with revised targets and more targeting toward priority group households, so confirm current eligibility rather than relying on an article from last year, including this one.

STCs: the discount that is not called a rebate

Small-scale technology certificates come from the federal Small-scale Renewable Energy Scheme, administered by the Clean Energy Regulator, and they are the same mechanism that sits behind the price of rooftop solar. An eligible heat pump displaces electricity that would otherwise have been generated, and the system earns certificates for the displacement it is deemed to deliver over its lifetime.

• The number of certificates depends on the specific model, which must be listed on the Clean Energy Regulator register of solar water heaters and air source heat pumps. An unregistered model earns nothing.
• The number also depends on the climate zone. Adelaide sits in Zone 4.
• The value of each certificate floats with the market, so what the certificates are worth moves month to month without anything changing at your end.
• The householder assigns the right to create the certificates to the installer, and the installer deducts an equivalent amount from the price. That is why STCs almost never appear on a quote as a separate line.

Ask for the STC deduction to be itemised on the quote, so you can see the installed price, the deduction and the net figure separately. A bundled number cannot be compared against another bundled number.

Council top-ups

Some South Australian councils run sustainability incentive schemes that include hot water upgrades, and where they exist they sit on top of REPS and STCs rather than replacing them. The City of Adelaide has run the most substantial of these, with a component for replacing an electric resistance system with a heat pump.

Treat all of them as address-specific and time-limited. Council programs open and close with budget cycles, most run on a first-come allocation, and eligibility usually turns on the rateable property address rather than on who lives there. A neighbouring suburb 2 streets away can sit in a different council area with no scheme at all.

Check directly with your own council before counting a council top-up in your budget, and check the claim order. Some schemes require the application to be approved before the work is carried out, and an installation done first is simply not eligible no matter how good the case is.

The traps that quietly kill a claim

• Buying the unit yourself. Certificates and REPS credits are created and assigned as part of an accredited installation. A heat pump bought online and installed afterwards generally cannot be retro-claimed, and the saving on the box is smaller than the incentives forfeited.
• Splitting the gas disconnection to another day. That is the difference between the low and the high REPS band, and it is the most expensive scheduling decision in this whole process.
• An unregistered model. If the unit is not on the Clean Energy Regulator register, it earns no STCs at all. Low-cost imports are where this bites.
• No compliant drain or no suitable power supply. A heat pump needs a drain to a legal discharge point and a power supply on the right circuit. A site that fails on either can be made to work, but that work needs to be priced before the day.
• No workable position. A unit needs clear airflow around it. A boxed-in side passage or a location where the discharge air blows straight back at the intake will fail on assessment or perform badly afterwards.
• Rental properties. The decision, the paperwork and the eligibility sit with the property owner. A tenant cannot claim a scheme against someone else's asset.
• Assuming last year figures. Scheme values, bands and eligibility criteria all change, and the 2026 REPS phase changed its targeting. Confirm the current position before committing.

When a heat pump is the wrong choice, incentives or not

A heat pump is an excellent system in most Adelaide homes. There are situations where it is not, and a discount does not change any of them.

• Low hot water demand. A 1 or 2 person household already on a controlled load electric tariff is not spending a great deal on hot water in the first place, so the saving is modest and even a heavily discounted heat pump can take 7 to 10 years to pay back. The incentives do not fix a weak case, they just shorten a long one.
• Noise, which is the most underestimated problem. A compressor runs for 2 to 4 hours at a stretch, and on the narrow allotments through Goodwood, Unley, Millswood and Hyde Park the only available position is frequently a side passage a metre and a half from a neighbour bedroom window. Check the sound power rating and walk the site before ordering. Neighbour disputes cost more than the saving.
• No outdoor space at all. Apartments, courtyard homes and terrace-style infill often have nowhere the unit can breathe. Continuous flow gas or an electric storage unit in the existing cupboard remains the practical answer.
• Adelaide Hills winters. At Stirling, Crafers, Bridgewater and Upper Sturt, winter mornings sit near or below zero, and a heat pump spends more time in defrost and on element boost. It still beats resistive heating, but the real coefficient of performance sits below the flat-suburb figure and payback stretches accordingly. Size it for the site, not the brochure.
• A working unit that is only a few years old. Scrapping a functioning system to chase an incentive rarely produces the cheapest decade, because the replacement clock restarts and the schemes will still exist when the current unit genuinely reaches its end.
• A switchboard that needs upgrading. That work lands entirely outside the incentives and can consume several years of savings on its own.

The right time to buy a heat pump in South Australia is when your existing system is at the end of its life, your site suits one, and the incentives bring the net price into range. When that lines up, a heat pump is the cheapest hot water a household can run short of self-consumed solar.

Marc is a licensed plumber and gas fitter with 20 years of experience, and he will look at the position, the drain, the power and the neighbours before recommending anything. If your site does not suit a heat pump, you will be told that. He texts an arrival time before setting off, and the price is discussed before the work starts.

Questions we get asked

References

• Government of South Australia, Department for Energy and Mining: energy saving rebates
• Clean Energy Regulator: Small-scale Renewable Energy Scheme
• energy.gov.au (Australian Government): hot water systems