PlumberUpdated September 2026

How Much Does Hot Water System Replacement Cost in Australia?

At a Glance

Sydney guide range

$1,500–$4,600per job

Mid point $2,600 per job

Sydney/NSW · Built 1990–2010 · Other factors typical · Not a personalised quote

Median reported amount $2,000 · Based on 31 reports · Report years: 2018–2026

Location

Property age

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Hot water system replacement in Australia typically costs $1,500–$4,600 per job, depending on the system type and installation complexity. A like-for-like electric storage swap sits at the lower end. Upgrading to a heat pump or solar system, or switching fuel types, pushes toward the upper range. Federal STCs and eligible state discounts can reduce heat pump costs; the amount depends on your state, existing system and eligibility.

Pricing by City

Hot Water System guide ranges, per job, for five major cities, using the same state and territory adjustments. Select a city to open its guide.

Ranges use each city’s state or territory adjustment to the Sydney baseline, rounded to the nearest $50. They are not quotes.

What's Included

A standard replacement quote covers removal and disposal of the old unit, supply of the new system, installation labour, and plumbing connections compliant with AS/NZS 3500:2025 Plumbing and Drainage (updated April 2025, mandatory from October 2025). The price includes a tempering valve to meet AS 3498 requirements (hot water must be stored at 60°C minimum to prevent Legionella, but delivered below 50°C at bathroom fixtures), pressure/temperature relief valve, and a compliance certificate. If switching fuel types (e.g. gas to heat pump), expect additional costs for electrical work, gas disconnection, and potentially a new circuit.

What Homeowners Reported Paying

Price reports shared by Australian homeowners.

Community price reports

Homeowner-reported amounts, with badges showing whether each was paid, quoted or unspecified.

Median reported amount: $2,000
Middle 50% of reported amounts (25th–75th percentile): $1,750 – $3,000

Based on 31 reports · Report years: 2018–2026

Individual community price reports. Reference information only.
Year & location	Scope of work	Reported amount
2026VIC	Rheem 26L 50C gas continuous flow; remove solar storage system; cap panels; alter pipework; valves; supply and install	$4,300Quoted
2026Australia	Rheem Everhot 80L storage tank; remove existing tank and replace	$3,000Quoted
2026NSW	new hot water system; supply and installation	$3,212Quoted
2026VIC	full hot water system replacement; tight laundry access; electrician additional	$4,200Quoted
2026WA	50L electric storage replacement; installed	$1,500Reported paid
2026WA	50L electric storage replacement; installed	$2,000Quoted
2026Australia	replace 50L tank with 120L Reece system	$3,300Quoted
2026WA	50L wall-mounted electric like-for-like replacement	$2,200Quoted
2026Australia	250L external storage replacement; full replacement and installation	$1,790Reported paid
2026Australia	hot water system replacement	$4,000Reported paid
2025WA	Like-for-like hydropower unit replacement	$1,200Price type unknown
2025Australia	Replacement of hydropower unit (1k unit + 300 labor)	$1,300Price type unknown
2025WA	Rinnai electric storage system; gas storage to electric storage conversion; quote	$2,200Quoted
2025Australia	hot water system replacement; delivered and installed; old unit removed	$1,200Reported paid
2025QLD	outdoor gas storage replacement; supply and install	$2,400Reported paid
2025NSW	Rinnai 315L storage system; supplied and installed; old tank removal	$2,000Reported paid
2025Australia	Therman 250L storage replacement; relocated from laundry to outdoors; no electrical work	$2,200Reported paid
2025VIC	hot water system replacement; supply and install	$1,600Reported paid
2025Australia	Rinnai Infinity 26L gas continuous flow with controller; supply and install quote	$1,900Quoted
2025Australia	replace a gas storage hot water tank like for like	$2,100Quoted
2025Australia	replace a gas storage tank with a continuous flow gas unit	$3,000Quoted
2024Australia	50L electric storage hot water tank replacement in a unit/apartment; billed during working hours	$4,800Reported paid
2023QLD	Replace hot water system	$1,500Price type unknown
2023Australia	supply and install a Rheem or Rinnai continuous flow gas unit replacing a Bosch	$1,800Quoted
2023Australia	swap a Rinnai for a basic Bosch P10 continuous flow unit (LPG)	$1,700Reported paid
2022Australia	replace a failed solar/electric system with gas hot water including running gas lines through the roof space	$3,000Reported paid
2020Australia	supply and install a Rinnai B26 continuous flow unit replacing an old storage system	$2,000Reported paid
2019Australia	replace an old gas storage tank with a Rinnai Infinity 20 continuous flow unit with controller (not a straightforward install)	$1,900Reported paid
2018Australia	Vulcan storage hot water system supplied and installed	$1,700Quoted
—SA	continuous flow hot water system replacement	$8,000Quoted
—SA	continuous flow hot water supply and fit incl power point	$1,770Quoted

Sparky collects public homeowner reports from forums such as Reddit, Whirlpool, OzBargain and PropertyChat, review sites such as ProductReview, and a few direct submissions. We read each source thread before adding a report but do not verify the underlying transaction. Reports include amounts paid, quotes received and amounts with an unknown price type; the statistics combine these types. GST treatment is usually unknown, and inclusions vary. Amounts are in Australian dollars and are not adjusted for inflation. The statistics describe this collection only. Compare scope, location and year before using them as a reference.

System Types and What They Cost

System Type	Installed Cost	Running Cost/Year	Lifespan	Example Brands
Electric storage	~$1,200–$3,000	$600–$1,500	10–15 years	Rheem Optima, Rinnai Hotflo
Gas continuous flow	~$1,400–$2,500	$400–$700	15–20 years	Rinnai Infinity 26, Rheem Metro 26
Heat pump	~$3,000–$6,500 (before rebates), ~$1,500–$4,000 (after rebates)	$200–$450	10–15 years	iStore 270L, Rheem AmbiHeat, Reclaim Energy, Sanden Eco
Solar hot water	~$3,000–$8,000	$150–$300	20+ years (panels), 10–15 years (tank)	Flat plate (electric boost), Evacuated tube (gas boost)

Electric storage is the budget option. A 250L unit suits 3–4 people (~$1,300–$2,800 installed). Simple installation, no gas connection needed, but the highest running costs. Off-peak tariffs reduce running costs by 30–40% but the tank only heats overnight, so large households may run out by evening.

Gas continuous flow units are compact wall-mounted systems that provide unlimited hot water. The Rinnai Infinity 26 (suits 1–2 bathrooms) runs ~$1,500–$1,900 installed. Note: under Victoria's regulations made in December 2025, from 1 March 2027 a mains gas hot water system in an existing home cannot be replaced with another mains gas unit unless an exemption applies, such as insufficient space, a central apartment system or a required switchboard or network upgrade. Repairs remain allowed, and bottled LPG is not covered. The Opposition has pledged to repeal the rule if it wins the 28 November 2026 state election, so check the rules before booking.

Heat pump systems work like a reverse-cycle air conditioner for water. The iStore 270L is the most popular mid-range unit (~$2,200–$3,000 after STCs). Rheem AmbiHeat runs ~$3,000–$4,000. Premium CO2 refrigerant models (Reclaim Energy, Sanden Eco) run $5,000–$6,500 but perform better in cold climates. The noise level (35–55 dB, comparable to a fridge) is worth considering for placement near bedrooms or boundaries. See our heat pump hot water costs for installation prices and rebate details.

Solar hot water flat plate collectors with electric boost start at ~$3,000. Evacuated tube systems with gas boost run $5,000–$8,000+. Requires a suitable north-facing roof section with minimal shading. Performs best in Brisbane, Perth, and regional QLD/WA.

Government Rebates: STCs and State Programs

Federal STCs (Small-scale Technology Certificates) apply to heat pumps and solar hot water. A typical heat pump earns about 13–18 STCs in 2026, worth roughly $450–$700 as a point-of-sale discount. Your installer assigns the STCs to a registered agent and passes the value on to you as a lower price. The number of STCs available falls each January, and the scheme ends after 2030.

State rebate programs stack on top of STCs:

VIC: Victorian Energy Upgrades (VEU) discounts are around $560 when replacing gas with a heat pump or $630 when replacing electric, applied at point of sale by accredited providers and varying with certificate prices. The Solar Victoria rebate offers $1,000, or $1,400 for an eligible locally made unit, capped at 50% of the price after other discounts. Under the eligibility rules from 1 July 2026, you must be an owner-occupier with combined household taxable income under $150,000, a property valued under $3m and an existing system at least three years old; one hot water or battery rebate is available per address. From 31 March 2025, all VEU-installed products must include a 5-year warranty. The state government says combined Solar Homes and VEU savings can reach $2,030 for a locally made system. Adding STCs brings the maximum total discount to about $2,700.
NSW: Energy Savings Scheme (ESS) discounts are up to $640 when replacing an old electric water heater with a heat pump, or up to $330 when replacing gas, according to the NSW Government. Participating installers apply the discount at point of sale; combined with STCs, it can reach about $1,340. Incentives for installing new gas appliances ended on 30 June 2026; replacing gas hot water with a heat pump still qualifies.
SA: Under the Retailer Energy Productivity Scheme (REPS), energy retailers set the discount; the government publishes no fixed dollar amount. Discounts are typically larger for homes without a gas connection, and availability varies by retailer. REPS2 runs from 1 January 2026 to 31 December 2030. Check the offer and availability with your retailer before booking. Note: activities generally permitted only once per address.
QLD: Federal STCs only. State rebates have closed.
WA: Federal STCs only. No state-specific program currently. A typical heat pump's federal STC discount is about $450–$700 in 2026.

What Affects the Cost

System type. Electric storage is cheapest to install (~$1,200–$3,000). Heat pumps cost more upfront (~$3,000–$6,500) but qualify for rebates and have the lowest running costs. The payback period for upgrading from electric storage to heat pump is typically 3–5 years.
Fuel changeover. Switching from gas to electric heat pump requires both a plumber and an electrician for a new dedicated circuit, with a separate switchboard upgrade at $1,000–$3,600 per job if the existing board needs replacing. Gas disconnection costs ~$150–$300 for meter capping. Full gas abolishment currently costs ~$1,400 but drops to ~$260 from July 2026 under an AER ruling.
Tank location and access. Roof-mounted tanks need structural assessment. Ground-level installs with clear access are simplest. Heat pumps need outdoor placement with adequate airflow. Tight courtyards in inner-city terraces add labour time.
Right-sizing. Rule of thumb: 50 litres per person per day. A 3–4 person household needs a 250–315L electric storage, 270–315L heat pump, or 20–26L/min gas continuous flow. Heat pumps need larger tanks than electric because they heat more slowly.
Anode rod condition. Sacrificial anodes in storage tanks protect against corrosion and need replacing every 3–5 years (~$150–$300). In hard water areas (Perth, parts of Adelaide), anodes corrode faster and may need replacement every 2–3 years. Regular anode maintenance extends tank life by 5+ years.
Strata restrictions. Some buildings limit system types or outdoor unit placement for heat pumps (noise concerns).

A straightforward like-for-like electric storage replacement in a ground-level location with good access sits toward $1,500. A gas-to-heat-pump changeover in an inner-city property with limited outdoor space, switchboard upgrade, and ageing plumbing pushes toward $4,600.

Signs You Need a Replacement

Tank leaking from the body (always replacement, no repair possible)
Unit over 10 years old (8+ for gas storage)
Rusty or discoloured hot water (anode failing, tank corroding internally)
Running out of hot water much faster than before
Frequent pilot light failures on gas systems
Visible corrosion on external fittings or tank body
Repair cost exceeds 30–40% of a new system price

Emergency vs Planned Replacement

Hot water failure is one of the more common plumbing emergencies, particularly in winter. After-hours callouts carry a 50–100% premium over business-hours rates (call-out fee alone can be $200–$700 vs $60–$150). If the system is failing but still producing some hot water, booking during business hours saves money. Under NCC provisions, a temporary electric system (up to 55L) can be used for up to 60 days while a permanent system is sourced.

Like-for-like electric storage and gas continuous flow replacements are most likely available same day (plumbers carry common sizes on vans). Heat pump installations typically take 1–5 days to coordinate due to electrical work and stock availability.

City and Regional Price Comparison

City-level: Sydney (NSW) serves as the baseline at $1,500–$4,600 per job. Melbourne tracks close to Sydney; Victoria's legislated mains gas hot water replacement rule is due to start on 1 March 2027, with exemptions, and the Opposition has pledged to repeal it if it wins the 28 November 2026 state election. Brisbane sits at or slightly below Sydney, with the subtropical climate delivering the best heat pump performance in Australia. Smaller trade pools influence installer availability and quotes in Perth and Adelaide. Adelaide has the highest electricity prices nationally (~$0.44/kWh), making the solar PV + heat pump combination the strongest economic argument of any city.

Suburb and regional level: Within any city, the spread depends on the property. Older inner suburbs with tanks in tight courtyards or on roofs push toward the upper end. Newer estates with modern infrastructure sit closer to $1,500. Properties with galvanised steel pipework connecting to the hot water system will need section replacements. Perth's hard water (121–180+ mg/L) shortens tank lifespan compared to soft-water cities.

How We Calculate

Estimates are based on current trade rates for licensed plumbers in each state, adjusted for regional labour costs and typical material prices. All figures include GST. Ranges reflect the spread between a straightforward like-for-like replacement and a more complex changeover or upgrade installation.

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Frequently Asked Questions

How long does it take to replace a hot water system?

A like-for-like replacement typically takes 2 to 4 hours. Switching fuel types, such as gas to electric heat pump, can take a full day because it involves both a plumber and an electrician, plus new pipework or electrical circuits. If parts need to be ordered, you may be without hot water overnight.

Do I need a plumber or an electrician to replace a hot water system?

You need a licensed plumber for all water connections and a licensed electrician for electrical connections. Gas systems also require a licensed gas fitter. For a like-for-like electric storage replacement, many plumbers handle both the plumbing and electrical components if they hold dual licences. Fuel changeovers always require both trades.

What government rebates are available for hot water system upgrades?

Small-scale Technology Certificates (STCs) under the federal Renewable Energy Target reduce the upfront cost of heat pumps and solar hot water systems. Most states also offer additional rebates or interest-free loans. The combined value varies by system type and location but can reduce heat pump costs by several hundred to over a thousand dollars.

How do I know if my hot water system needs replacing or just repairing?

Signs that replacement is more cost-effective than repair include the unit being over 10 years old, visible rust or corrosion on the tank, water pooling at the base, or recurring pilot light failures on gas systems. A licensed plumber can assess whether a repair is viable, but once a storage tank is leaking from the body, replacement is the only option.

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