What's Included in the Price
- Supply and delivery of the hot water unit (storage tank or heat pump)
- Dedicated electrical circuit from switchboard, wired to AS/NZS 3000:2018 Wiring Rules, including circuit breaker with RCD protection and isolating switch within 1.25 metres of the unit
- Cable run sized to AS/NZS 3008 (2.5mm² TPS for standard 10A heaters, 4mm² for 20A heat pump circuits)
- Plumbing connection for hot and cold supply, pressure relief valve, and drainage
- Tempering valve to cap delivery temperature at 50°C at bathroom fixtures
- Removal and disposal of the old system
- Commissioning, thermostat calibration, and safety checks
What Affects the Cost
- System type. Heat pumps extract heat from ambient air and work well in Melbourne's climate down to around 5°C. Modern CO2 refrigerant models (Reclaim Energy, Sanden Eco Plus) perform down to -7°C. Heat pumps cost more upfront but use 60–70% less energy than resistive storage tanks.
- Tank capacity. Melbourne's cold winter inlet water temperatures (around 10°C) mean the system works harder than in Brisbane or Perth. Sizing up from 250L to 315L avoids running out during back-to-back showers. A Rheem AmbiHeat 270L suits 3–4 people; the Sanden Eco Plus 315L handles larger households.
- Existing circuit. Replacing a like-for-like unit on an existing dedicated circuit is the cheapest scenario, typically just reconnection and testing ($200–$400 in electrical costs).
- Switchboard upgrade. Older weatherboard homes in inner suburbs often have original ceramic fuse boards that need full replacement before a new hot water circuit can be added. Budget $800–$2,500 for the board upgrade alone.
- Placement. External installations need weather protection. Garages and laundries are common locations in Melbourne. Heat pumps produce 40–55 dB (similar to a quiet air conditioner) and need clearance from bedroom windows and boundary fences.
- VEU + Solar Homes rebates. Victoria offers the most generous rebate stacking in Australia. VEU certificates from accredited providers plus the Solar Homes hot water rebate (up to $1,400 for eligible Australian-made units from mid-2025) plus federal STCs can reduce a heat pump installation by $2,000–$3,400.
A like-for-like storage tank replacement on an existing dedicated circuit in a home with ground-level access sits toward $1,150. Switching to a heat pump in a pre-war cottage that needs a full switchboard replacement, new circuit, and careful placement away from neighbours pushes toward $2,850.
A failed hot water system in a Melbourne winter is genuinely urgent. After-hours and weekend callouts carry premium rates. If the system is producing lukewarm water rather than none at all, scheduling during business hours keeps the cost down.
Melbourne-Specific Considerations
Melbourne's climate makes system choice consequential. Winter mornings regularly drop below 5°C, which increases both energy consumption (the system works harder to heat cold inlet water) and peak demand. A correctly sized system prevents the late-afternoon "no hot water" problem in households of three or more. Premium CO2 heat pumps like the Reclaim Energy and Sanden Eco Plus maintain higher COPs at low ambient temperatures, making them a better fit for Melbourne winters than budget R134a models.
Victoria's gas ban adds urgency to the heat pump decision. From March 2027, failed gas hot water systems in existing homes must be replaced with an electric alternative. If your current gas system is nearing end-of-life (8+ years for gas storage), planning the electrical work now, while rebates are strong, avoids a rushed replacement later.
Victorian terraces and Edwardian cottages in Carlton, Fitzroy, and Richmond typically have the hot water system in a rear lean-to or against an external wall, with tight spaces and limited ventilation. These properties often have original ceramic fuse boards that need full replacement before a new hot water circuit can be added. The combination of switchboard upgrade plus new circuit plus limited placement options pushes these homes toward the top of the range.
Outer suburban homes from the 1970s–90s in Ringwood, Glen Waverley, and Frankston usually have the unit in the garage or on an external slab beside the laundry. These are simpler to work with, and many already have a dedicated off-peak circuit in place, keeping the electrical portion of the job straightforward.
Melbourne's electricity distribution is split across multiple networks. CitiPower covers the CBD and inner suburbs, Powercor covers the west, United Energy covers the south-east, and Jemena and AusNet cover other areas. Your electrician needs to know which distributor services your property, as controlled load tariff availability and metering requirements vary between networks.
Hiring a Licensed Electrician in VIC
All electrical work in Victoria must be performed by a licensed electrician registered with Energy Safe Victoria (ESV). ESV specifically notes that hot water system electrical connections are prescribed electrical work requiring a Certificate of Electrical Safety.
Worth checking:
- Current ESV registration (not just an expired licence)
- They will lodge a Certificate of Electrical Safety (CoES) within 30 days of completing the work
- Public liability insurance coverage
- Familiarity with your electricity distributor's connection and metering requirements
- Experience with the specific heat pump brand you have chosen
A thorough installer will inspect your switchboard before quoting. The dedicated circuit and switchboard capacity check is the difference between an accurate quote and a surprise surcharge on the day.
How We Calculate
Estimates are based on current licensed Electrician rates in metropolitan Melbourne, typical equipment costs, and standard installation complexity. All prices include GST. Ranges reflect the difference between a straightforward replacement on an existing circuit and a new installation requiring switchboard upgrades or system type change. VEU and Solar Homes rebates are not deducted from the displayed range.