What a heat pump hot water system really costs

Typical ranges (mid-2026)

• Budget systems: from around $2,000–$3,000 installed before incentives — heavily discounted packages in VIC/NSW can advertise far lower after scheme discounts.
• Mid-range and premium systems (quieter, longer warranties, better cold-weather performance): $3,500–$6,500 installed before incentives.
• After incentives: in Victoria the stack commonly removes $1,500+ before STCs; Queensland takes $800–$1,000 off; SA up to ~$850 ex GST going all-electric; WA gets STCs only.

What moves your quote

• Relocation and pipework: replacing like-for-like in the same spot is cheapest; moving the unit or switching from gas adds plumbing and possibly electrical work.
• Switching from gas: may need a new power circuit and (in SA especially) consider disconnecting gas entirely — it raises the rebate and removes the daily gas supply charge.
• The unit itself: cheap units can be noisier and slower in cold snaps; premium units cost more upfront but usually carry longer warranties.
• Where you live: dense installer competition in the capitals keeps prices tighter than regional areas.

Running costs, honestly

A heat pump uses roughly 70–75% less energy than an electric storage system for the same hot water. Against gas the savings depend on your tariffs — and if you have solar PV, running the heat pump on a daytime timer effectively heats your water with your own sunshine, which is the best economics available.

How to not overpay

• Get at least three quotes — the spread on identical units is routinely $1,000+.
• Ask every quote to itemise: unit, installation, and each rebate or discount on separate lines.
• Confirm the installer is a licensed plumber and accredited for your state's scheme — no accreditation, no rebate.
• Ask about noise ratings and warranty length, not just price — the cheapest unit is often the one you'll replace first.