What's Included
A typical electric hot water installation covers:
- Supply and delivery of the hot water unit (storage tank or heat pump)
- Dedicated electrical circuit from the switchboard with its own circuit breaker and RCD protection, wired to AS/NZS 3000:2018 Wiring Rules. Section 4.8.2 requires a dedicated isolating switch within 1.25 metres of the unit, accessible without tools.
- Cable run sized to AS/NZS 3008, typically 2.5mm² TPS for standard 10A storage heaters or 4mm² for higher-draw heat pumps on 20A circuits
- Plumbing connection for hot and cold supply lines, pressure relief valve, and drainage
- Tempering valve as required by AS 3498 to cap delivery temperature at 50°C at bathroom fixtures
- Removal and disposal of the old unit
- Commissioning and testing of heating elements, thermostat calibration, and relief valve operation
Not typically included: switchboard upgrades (if no spare circuit breakers), relocating the unit to a new position, upgrading supply pipework from the meter, or controlled load meter changes.
Types of Hot Water Electrical Work
The scope of electrical work varies significantly depending on whether you are replacing, upgrading, or adding a new system.
| Work Type | Typical Electrical Scope | Indicative Electrical Cost |
|---|---|---|
| Like-for-like tank replacement | Reconnect existing circuit, test, replace isolating switch if needed | $200–$400 |
| New dedicated circuit | Run cable from switchboard, install circuit breaker (20A RCBO, $26–$50), isolating switch, connect unit | $400–$800 |
| Controlled load / off-peak setup | Meter reconfiguration via distributor, contactor relay, timer wiring | $150–$350 (plus distributor fees) |
| Heat pump circuit (new) | Dedicated 15A or 20A circuit, RCD protection, isolating switch, commissioning | $400–$900 |
| Timer or smart controller | DIN-mount timer in switchboard ($100–$200 for device) or smart relay for solar diversion | $200–$500 installed |
| Solar diverter installation | Catch Power Green Catch ($900–$1,100 for device), CT clamp on mains, wiring to element circuit | $1,200–$1,600 installed |
| Switchboard upgrade | Full board replacement to accommodate new circuit | $800–$2,500 (see switchboard upgrade costs) |
Heat Pump Brands and Electrical Requirements
Not all heat pumps draw the same power. The electrical circuit your electrician installs depends on the unit you choose.
| Brand / Model | Tank Size | Max Draw | Circuit Required | Notable Feature |
|---|---|---|---|---|
| iStore 270L | 270L | ~6A (runs on 10A socket) | Standard 10A GPO or dedicated circuit | Plug-in design can save $500–$1,500 in wiring costs |
| Rheem AmbiHeat 270L | 270L | ~10A | Dedicated 15A circuit | Glass-lined tank made in Sydney, Japanese compressor |
| Reclaim Energy CO2 | 270–315L | ~6A (compressor unit) | Dedicated circuit, split system (outdoor unit + indoor tank) | CO2 (R744) refrigerant, works to -7°C, up to 10-year compressor warranty |
| Sanden Eco Plus | 250–315L | ~5A | Dedicated circuit, split system | COP up to 5.0, performs well in cold climates |
| Rheem AmbiPower 270L | 270L | ~10A | Dedicated 15A circuit | R290 (propane) refrigerant, higher efficiency than R134a models |
The iStore 270L is notable because it runs on a standard 10A power point rather than requiring a hardwired dedicated circuit. For homes where running a new cable from the switchboard is expensive (long cable runs, difficult access), this can save $500–$1,500 in electrical costs. Your electrician should still verify the existing circuit has adequate capacity and RCD protection.
What Affects the Cost
- System type. Heat pumps cost more upfront than resistive storage tanks but use 60–70% less energy. Government rebates in NSW, Victoria, and SA can close most of the price gap. The iStore 270L's plug-in design can eliminate dedicated circuit costs entirely.
- Tank capacity. A 1–2 person household needs 160–250L, while a family of 4+ typically requires 315–400L. Larger tanks cost more to buy, deliver, and install.
- Switchboard capacity. Older boards without a spare circuit breaker need an upgrade before installation. Common in pre-2000 homes across all cities. An RCBO for the new circuit costs $26–$50 for the device alone (Clipsal Resi MAX at $26–$33, Hager ADC at $32–$39).
- Existing wiring. Replacing a like-for-like unit on an existing dedicated circuit is the cheapest scenario. New installations or system type changes often need new cabling from the switchboard, typically 2.5mm² or 4mm² TPS depending on the load.
- Controlled load tariff changes. Switching from an off-peak storage tank to a heat pump on continuous supply requires meter reconfiguration through your energy distributor. This can involve a contactor relay change and distributor fees.
- Timer or solar diverter. A DIN-mount timer in the switchboard ($100–$200) lets you schedule heating during off-peak hours or solar generation. A dedicated solar diverter like the Catch Power Green Catch ($900–$1,100) diverts surplus rooftop solar to the hot water element, reducing running costs to near zero on sunny days.
- Access and relocation. Moving the unit to a different position adds plumbing runs, electrical cable, and potentially drainage work. Roof-mounted tanks, tight laundries, and apartment plant rooms increase labour time.
A straightforward like-for-like tank replacement on an existing dedicated circuit, with ground-level access, sits toward $1,200. Switching from gas to heat pump in an older property that needs a switchboard upgrade, new dedicated circuit, and full system replacement pushes toward $3,000.
Hot water system failures are often urgent, leaving the household without hot water. After-hours, weekend, and emergency callouts carry premium rates compared to scheduled business-hours work. If the system is still producing some hot water, booking during business hours saves money.
When You Need Hot Water Electrical Work
Several common scenarios trigger electrical work on hot water systems:
- Replacing a failed storage tank on an existing circuit (simplest, reconnect and test)
- Switching from gas to electric (new dedicated circuit from switchboard, gas disconnection by licensed gasfitter)
- Upgrading to a heat pump (may need new circuit if existing off-peak circuit is incompatible)
- Adding a timer or solar diverter to reduce running costs on an existing system
- Off-peak tariff setup (contactor relay and meter reconfiguration through your distributor)
- New build or renovation (circuit installed as part of broader electrical fit-out)
- Switchboard upgrade triggered by the hot water installation (no spare ways, no RCD protection, or ceramic fuses)
Government Rebates and Incentives
Heat pump hot water systems qualify for the same federal and state rebate programs as the plumbing-side installation. These rebates reduce the combined cost of the system and its electrical work.
Federal STCs (Small-scale Technology Certificates) apply to heat pumps and solar hot water. A typical heat pump generates 20–30 STCs worth $700–$1,200 total, applied as a point-of-sale deduction by your installer. STCs are assigned to a registered agent who handles the paperwork; you receive the value as a lower upfront price.
State programs stack on top of STCs:
- VIC: Victorian Energy Upgrades (VEU) provides up to ~$1,000 off through accredited providers. The Solar Victoria hot water rebate adds up to $1,000 (or $1,400 for eligible Australian-made units from mid-2025). Eligibility: owner-occupier, combined household income under $210,000/year, existing system 3+ years old. VEU discounts are applied at point of sale by accredited providers. Combined with STCs, a heat pump in Victoria can cost as little as $1,500–$2,500.
- NSW: Energy Savings Scheme (ESS) provides $400–$670 when replacing electric storage with a heat pump, or $190–$300 when replacing gas. Applied as a point-of-sale discount through participating installers. Gas-related ESS activities end 30 June 2026.
- SA: Retailer Energy Productivity Scheme (REPS) provides $1,000–$1,300 if not connected to gas (or disconnecting gas same day), or $300–$450 if connected to gas. Discounts are delivered through participating energy retailers. REPS Phase 2 runs 2026–2030. Note: activities generally permitted only once per address.
- QLD and WA: Federal STCs only (typically $700–$1,200). No state-specific hot water programs currently active.
City and Regional Price Comparison
City-level differences: Sydney (NSW) sets the baseline. Melbourne and Brisbane track within 5% of Sydney pricing, driven by similar labour markets and equipment supply chains. Perth and Adelaide run 10–15% higher due to smaller trade pools and higher equipment transport costs. State rebate programs (detailed above) shift the effective cost significantly, particularly in Victoria where combined discounts can reduce a heat pump installation by $2,000–$3,400.
Suburb and regional-level differences: Within any city, the main cost variables are property age, switchboard condition, and access. Inner-city homes in suburbs like Marrickville (Sydney), Fitzroy (Melbourne), or Prospect (Adelaide) typically have older switchboards with ceramic fuses or rewirable fuse wire, meaning a board upgrade adds to the installation cost. New-build estates in outer suburbs like Oran Park (Sydney), Tarneit (Melbourne), or Springfield (Brisbane) usually have modern boards with spare capacity, keeping the job straightforward. Elevated Queenslander homes in Brisbane's inner suburbs provide easy sub-floor access for plumbing connections, while apartment buildings across all cities add complexity through strata approvals, restricted work hours, and shared plant rooms.
How We Calculate
Estimates are based on current licensed Electrician rates adjusted for each state, typical equipment costs from major Australian suppliers, and standard installation complexity. All prices include GST. Ranges reflect the difference between a straightforward like-for-like replacement and a new installation requiring switchboard work or system type change. State rebates are not deducted from displayed ranges.