Heat Pump Hot Water Rebates & STCs Explained
Eligible heat pump hot water systems can attract federal Small-scale Technology Certificates, and some states offer additional incentives. The important part is separating the schemes: the model, installation date, postcode, existing system and installation process can all affect what you actually receive.
Enter the 10-year STC figure shown in the CER register for the exact model and zone.
What Are STCs?
Small-scale Technology Certificates are created under the Australian Government's Small-scale Renewable Energy Scheme. Eligible air-source heat pump water heaters can earn certificates after installation. Each STC represents one megawatt-hour of eligible renewable electricity generated, stored or displaced under the scheme's rules.
Most householders do not create and sell the certificates themselves. Instead, they assign the right to create them to a registered agent in exchange for an upfront discount. That is why STCs often appear on a quote as a deduction from the installed price even though they are technically certificates rather than a fixed cash rebate.
The number of eligible certificates is set by scheme rules, but the dollar value you receive can vary with certificate value, agent arrangements and administration. Compare the final installed price rather than assuming every provider will apply the same dollar discount.
What Has to Be Eligible?
Buying a product advertised as a heat pump does not automatically create an STC entitlement.
The exact air-source heat pump model must be on the Clean Energy Regulator's register for the relevant installation period.
Air-source heat pumps must have a storage capacity no greater than 425 litres for eligibility under this pathway.
The system must be installed in accordance with the registered configuration and applicable licensing requirements.
Eligibility is determined after installation, and certificate creation must occur within the scheme's required timeframe.
Why the Number of STCs Falls Each Year
The Small-scale Renewable Energy Scheme is scheduled to end in 2030, so the deeming period for heat pumps and solar water heaters reduces as the scheme approaches its end.
| Installation Year | Deeming Multiplier | Example Using 30 Register STCs | What Happens |
|---|---|---|---|
| 2026 | 0.5 | 15 STCs | Half of the 10-year register figure, rounded down where required. |
| 2027 | 0.4 | 12 STCs | The available certificate count reduces again. |
| 2028 | 0.3 | 9 STCs | Three-tenths of the 10-year register figure. |
| 2029 | 0.2 | 6 STCs | Only two years of the remaining deeming period. |
| 2030 | 0.1 | 3 STCs | Final scheduled year of the current scheme. |
Why Two Heat Pumps Can Receive Different STCs
The certificate count is not based on retail price or tank size alone.
The Clean Energy Regulator register lists certificate entitlements for individual approved models. Similar-looking products can have different certificate counts.
The register uses different heat-pump and solar-water-heater zones because expected displaced energy varies with location.
The same registered model installed in a later year can create fewer certificates because the scheme is moving toward 2030.
STCs and state installation incentives are tied to an eligible installed system and the relevant scheme process. If you are buying a heat pump from HWO for your own installer to fit, confirm the exact model, installer participation, documentation and who will claim or assign the certificates before installation. Do not assume a supply-only purchase by itself creates a rebate entitlement.
Federal STCs and State Incentives Are Different
Some installations may be able to access more than one incentive, but each scheme has its own eligibility and process.
Available nationally for eligible installed systems under the federal SRES. The entitlement varies by exact model, zone and installation year.
NSW currently offers an Energy Savings Scheme discount for eligible heat-pump upgrades. The published indicative maximum is up to $640 when replacing electric hot water and up to $330 when replacing gas, with actual discounts varying by installation and provider.
Eligible Victorian households can currently access up to $1,000 for eligible hot-water products, or up to $1,400 for eligible locally made products, subject to Solar Victoria's current household, product and retailer requirements.
Do Not Assume There Is No Other Support
Programs can open, close or change during the life of this page, and local councils or energy programs can sometimes add further support.
| Location | Federal STCs | State / Local Support | Best Check Before Purchase |
|---|---|---|---|
| QLD | Potentially available for eligible installations. | Programs can vary over time and by customer type. | Check energy.gov.au and current Queensland programs. |
| NSW | Potentially available. | Energy Savings Scheme hot-water discounts are currently available; selected postcodes may have additional limited offers. | Check NSW Climate and Energy Action before work starts. |
| VIC | Potentially available. | Solar Homes hot-water rebates and other Victorian efficiency incentives may apply to eligible installations. | Check Solar Victoria and current VEU requirements. |
| ACT / SA / WA / TAS / NT | Potentially available. | State, territory and local programs can change. | Use the Australian Government rebate finder and relevant local energy authority. |
Some programs require an approved provider, nomination paperwork, eligible existing equipment or approval before payment or installation. Waiting until after the job can make an otherwise suitable upgrade ineligible.
From Product Choice to Discount
The exact paperwork varies, but the key principle is to establish eligibility before assuming the quoted discount is yours.
Confirm the product is currently listed on the Clean Energy Regulator register and note the applicable zone certificate count.
Confirm the installer and any registered or accredited certificate provider can meet the relevant federal and state scheme requirements.
Some incentives require nomination, assignment, declarations, photos or other evidence before or immediately around installation.
The installed configuration needs to match the scheme requirements and exact product listing.
Most consumers assign the right to create STCs to a registered agent in exchange for a discount rather than trading certificates themselves.
Retain the invoice, compliance documentation, product details and any incentive paperwork supplied with the installation.
What Can Cause Incentive Problems?
The cheapest advertised rebate figure is not useful if the installation cannot actually satisfy the scheme.
Model names in the CER register can differ from the retail marketing name. Verify the exact registered model rather than matching the brand only.
Some state incentives need forms or approval before installation or payment. Do not assume they can be backdated.
An eligible product alone does not guarantee a state discount if the installer or certificate provider is not part of the required scheme.
Choose the Right Heat Pump Before Chasing the Rebate
An incentive should improve the price of a suitable system — it should not be the reason to install the wrong size or product.
Work out the storage and recovery requirements before selecting an incentive-eligible model.
Compare efficiency, recovery, noise, controls, climate and warranty after sizing is clear.
Browse current HWO models and confirm incentive eligibility for the exact product and installation path.
Common STC & Rebate Questions
Current general guidance as at October 2026. Government programs and eligibility can change, so verify before purchase or installation.
