Heat Pump Costs: Start With the Full Quote
Heat pump hot water quotes can cover very different work. Start with the model, installation scope and any confirmed discounts, then compare the final amount you would pay. The published examples below are useful reference points; your home's system, access, plumbing and electrical work need their own quote.
Compare the same scope
Check the model, installation work and exclusions.
Confirm the discount
Ask which incentives apply and what remains payable.
Look beyond purchase
Consider your hot water routine, running costs and support.
Published Installation Examples and What They Include
These offers were checked on 14 October 2026. They show why the model, existing system and installation scope matter; they are advertised examples, not national averages or prices offered by The Wombat.
| Publisher and package | Published amount | Installation scope |
|---|---|---|
| Chill'd Industries: iStore 180L | $2,700 incl GST, after STC discount | Single-storey, like-for-like replacement of an existing heat pump, in the same position, with suitable existing power and no new footing or structural work. |
| Chill'd Industries: iStore 270L | $3,200 incl GST, after STC discount | The same published like-for-like conditions apply. Extra work needs a separate quotation. |
| Positive Energy: Perth iStore 270L | From $4,390 incl GST, after federal STC discount | Unit and standard installation at the existing hot water location. Relocation or removal of an old roof system is quoted separately. The published price assumes a 2026 installation. |
Chill’d Industries: service region lists south-east Queensland and northern NSW as its service region; Positive Energy's example is for Perth. Confirm your address and the full package conditions with the publisher. Chill'd also sets requirements for the existing power connection; your installer must assess suitability. Both publishers show the STC discount already applied, so do not deduct it again.
For your own quote, ask for the exact model, supply and installation, removal of the old system, any plumbing or electrical changes, site/base work, discounts, tax treatment and exclusions. Compare the final amount payable for the same work.
Check Rebates Before You Commit
Programme checks below are dated 14 October 2026. A discount or rebate is separate from the installed price, and not every customer, model or job qualifies.
| Programme or location | Official starting point | What to check |
|---|---|---|
| Federal STCs | Clean Energy Regulator: water heaters and heat pumps | Eligible air-source heat pumps can earn certificates. Assigning the rights to an agent can provide a purchase discount; eligibility and the certificate value used by the agent need checking. |
| Victoria | Solar Victoria: hot water rebate and Victoria: hot water system discounts | Solar Homes can cover 50% of the product price after other discounts, capped at $1,000 or $1,400 for eligible locally made products. Household, property, product and retailer rules apply. VEU discounts have their own requirements. |
| New South Wales | NSW: hot water upgrade incentive | The Energy Savings Scheme provides an upfront quote discount for eligible upgrades. The amount depends on the existing heater, chosen system, provider and installation; ask for the discount and remaining cost in writing. |
| South Australia | South Australia: energy saving rebates | REPS includes water-heating activities. Offers vary between providers; confirm the eligible activity, any discount and the amount you would pay. |
Ask which discounts are already in the quote, who handles the paperwork and whether approval is needed before purchase or installation. Follow the current programme process, including any emergency-replacement arrangements. For other locations, start with the relevant government and retailer guidance; this table is not a complete national inventory.
Compare Running Costs for Your Household
A heat pump can use less energy than a conventional electric resistance water heater. Your bill still depends on hot water use, the model, climate, controls and energy plan. Australian Government: hot water systems provides an overview of the system types.
Ask for a running-cost comparison that explains:
- The expected energy use and the conditions used to estimate it.
- Your electricity tariff, heating schedule and any demand or separate supply charges.
- How cold-weather boosting could affect energy use.
- How existing solar and timer settings would work with the proposed model.
- Which gas charges would remain if you keep gas for other appliances.
Use your own bills and a documented estimate rather than a fixed annual saving. If comparing payback, include the upfront difference, ongoing care and the assumptions over the chosen period. Australian Energy Regulator: electricity tariffs explains tariff structures; a cheaper time window alone does not establish the lowest whole bill.
Compare the Exact Models and Local Support
Put the proposed models side by side with their written specifications and installed quotes. This gives you a clearer comparison of what will suit your home and what you would pay.
- Exact model and whether the unit and tank are integrated or separate.
- Storage capacity and recovery performance under the stated conditions.
- Performance in your local temperatures and any booster operation.
- Noise information, measurement conditions and proposed placement.
- Timer, solar or control features that work with your existing setup.
- Tank, heat-pump, parts and labour warranty terms, plus local service support.
Use the manufacturer's current documents for the model being quoted. For example, STIEBEL ELTRON: WWK model information provides model-specific information and an operation/installation/warranty download. It does not establish a ranking of every brand. Ask the installer to explain any price difference in equipment, scope or support.
Size the System Around Your Hot Water Routine
Tell the installer about the dwelling and your busiest hot water periods. Solar Victoria: sizing your hot water system explains why household needs and the manufacturer's recommendations matter.
- People using hot water now and any expected change.
- Back-to-back showers, baths and multiple bathrooms.
- Morning and evening demand, including regular guests.
- Appliances that actually use the home's hot water supply.
- Any intended solar or timed heating schedule.
Ask the installer to explain the proposed model's storage and recovery assumptions for your busiest period. Tank litres alone do not guarantee the amount of usable hot water throughout the day. Avoid choosing a model only from a generic people-to-litres table or a most-popular claim.
Agree the Installation Scope Before Booking
A written installation proposal should explain the work for your property, who will do it and how long you may be without hot water.
- Arrange assessment of the proposed location, access, base, airflow, noise, plumbing and power supply.
- Confirm the licensed trades carrying out the plumbing, electrical work and any gas disconnection, plus any necessary permissions.
- Itemise removal of the old system, including roof access or relocation if relevant.
- Agree the installation schedule, interruptions and when the system should be ready for use.
- Keep the operating instructions, warranty terms and required completion documents at handover.
Leave circuit selection, safety devices, water-temperature controls and refrigeration/plumbing work to the appropriately licensed trades following the manufacturer's instructions. Solar Victoria: planning heat pump hot water explains the main planning considerations. Check relevant licences and insurance before hiring.
Check the Model and Location for Your Climate
Ask how the proposed model performs in your local winter conditions, how it recovers after heavy use and whether a booster changes the expected energy use. Read the manufacturer's application range for the exact model.
Placement also affects airflow, noise, access and servicing. Ask the installer to explain the proposed location and clearances, including the effect on nearby bedrooms and neighbours.
Solar Victoria: planning heat pump hot water covers cold-weather boosting, timers and noise. Discuss solar or timed operation alongside your hot water needs and tariff. A general climate label or brand name does not establish the best setup for a particular home.
Plan for Care, Warranty and Service
Ask for the operating and care instructions for the exact model before choosing. Confirm what you can safely do yourself, what needs a qualified service technician and any servicing or water-quality conditions in the warranty.
- What is covered for the tank, heat-pump unit, other parts and labour?
- Who handles a service or warranty enquiry locally?
- What routine care and professional servicing does this model require?
- What call-out, labour or other costs could remain yours?
- What support and parts are available if a fault occurs?
Solar Victoria: hot water warranties explains why warranty conditions and local support matter. Keep the installation and service records. For a fault, ask for a diagnosis and written repair or replacement options rather than using a generic age or repair-price rule. Refrigerant, electrical and plumbing work should stay with the appropriately qualified trades.
Sources and Checks
These sources were checked on 14 October 2026. Publisher prices and their conditions are linked in the examples table; programme links are in the rebate table. Confirm current offers and model documents before committing.
- Australian Government: hot water systems
- Clean Energy Regulator: water heaters and heat pumps
- Solar Victoria: sizing your hot water system
- Solar Victoria: planning heat pump hot water
- Solar Victoria: hot water warranties
- STIEBEL ELTRON: WWK model information
- Australian Energy Regulator: electricity tariffs
