How Much Does It Cost to Replace a Hot Water System in Melbourne in 2026?

Hot water replacement is one of those purchases where the quoted price varies by thousands depending on the unit, the location, and whether your installer is rebate-approved. Here is an honest 2026 Melbourne breakdown so you know whether a quote is fair before you sign.

Typical price ranges (supplied and installed, GST included)

Electric storage 250L-315L: $1,500 to $2,500.

Gas storage 135L-170L: $1,800 to $3,000.

Gas continuous flow (16-26L/min): $2,200 to $3,800.

Heat pump (270L-300L, rebate-eligible): $1,800 to $3,500 after Victorian Energy Upgrades and STC discounts; $4,500 to $6,500 without.

Solar hot water (split system, gas-boosted): $4,500 to $7,500.

What drives the variation

The unit itself. A 26L/min continuous flow Rinnai costs more than a 16L/min. A Reclaim CO2 heat pump costs more than a Rheem entry-level model.

Location of the existing unit. Tight side-access, second-storey balconies, or units inside cupboards cost more to swap out.

Gas vs electric changeover. Going from gas to heat pump usually adds $400 to $900 because new wiring, isolation switch, and possibly tempering valve upgrades are needed.

Compliance upgrades. If the existing install does not meet current AS/NZS 3500, a tempering valve, pressure-limiting valve, or seismic strapping may be required at change-over.

Distance to mains. Long pipe runs or replacement copper lines add labour.

After-hours work. Emergency same-day replacements run 30-60% above standard rates.

Rebates and what they actually mean

The Victorian Energy Upgrades program (energy.vic.gov.au) currently offers $1,000-$3,000 off heat pumps when installed by an Accredited Provider. Federal Small-scale Technology Certificates add a further several hundred dollars depending on zone and unit. Both are usually applied as upfront discounts by the installer, not as cash-back. Sustainability Victoria (sustainability.vic.gov.au) keeps the eligibility list current.

What a fair quote should include

Unit, supply and install, GST.

Removal and disposal of the old unit.

Isolation valves, tempering valve, and any AS/NZS 3500 compliance items.

VBA Certificate of Compliance (vba.vic.gov.au).

Manufacturer warranty registration.

If any of those are missing or marked as extra, ask why.

FAQ

Is a $999 heat pump install too good to be true?

Usually yes. After STCs and Victorian rebates, the floor for a properly compliant install (tempering valve, isolation, COC) is around $1,800.

Do I need three quotes?

Two is usually enough if both itemise the same scope and one is from a licensed local plumber. Look at scope, not just the bottom line.

Will a heat pump work in winter in Melbourne?

Yes. Modern heat pumps function down to -5C, which Melbourne winters comfortably stay above.

What is the cheapest option overall?

With rebates, a heat pump is now usually the cheapest total-cost-of-ownership choice for a 1-4 person household in Melbourne.

Phone Newton Plumbing - +61 414 951 362. Licence #107733.

Internal links: hot water Burwood, hot water Blackburn, hot water Box Hill, hot water Glen Waverley.

External links: energy.vic.gov.au, sustainability.vic.gov.au, vba.vic.gov.au, accc.gov.au.