Jun 9, 2026

Replacing Gas Hot Water With Electric Heat Pump Australia 2026: The Installer's Guide

Gas connections are being phased out in new residential builds across multiple Australian states. Existing gas appliances — particularly gas hot water systems — are increasingly being replaced with electric alternatives as households electrify and as gas prices continue rising faster than electricity prices in many markets.

For electricians and solar installers, gas-to-electric hot water conversion is a significant and growing work category. The average installed value of a gas-to-electric heat pump switchover is $2,500–$5,500 before rebates — and in many cases, state and federal rebates reduce the customer’s out-of-pocket cost enough to make the job an easy sell.

This guide covers the technical requirements for gas-to-electric heat pump conversion, the common installation challenges, how to sell the switch, and the rebate landscape in 2026.

Why Customers Are Switching From Gas Hot Water

The combination of financial and regulatory drivers is creating genuine pull demand for gas-to-electric conversion — customers are coming to you, not just the other way around:

Gas price increases: Wholesale and retail gas prices have risen significantly in Australia since 2022. For households on gas hot water, this has translated directly into higher energy bills. Heat pump hot water on solar generation can reduce hot water costs by 60–90%.

State government gas phase-outs: Victoria has banned gas connections in new residential buildings from 1 January 2024. The ACT has similar rules in place. Other states are tracking toward similar positions. Households in these states that are renovating or replacing gas appliances are increasingly choosing not to re-connect gas.

Solar integration opportunity: A customer with an existing solar PV system who replaces gas hot water with a heat pump effectively gains a large daytime thermal battery — the hot water tank stores solar energy in the form of heat. This makes solar more valuable and is a compelling proposition for solar-installed households.

State rebates: Several states offer specific rebates for gas-to-electric hot water conversion (see below), making the financial case even stronger.

Technical Requirements for Gas-to-Electric Conversion

Electrical Supply — The Critical First Assessment

Gas hot water systems typically have no dedicated electrical supply to the unit location (some instantaneous gas systems have a small control circuit, but not a power circuit for a heat pump). Converting to electric heat pump requires installing a new dedicated circuit from the switchboard to the heat pump location.

Circuit requirement: Most residential heat pumps require a dedicated 10A–15A single-phase circuit. Some larger units with a backup electric element above 3.6kW require 20A. Confirm with the manufacturer’s installation manual.

Switchboard assessment: Before quoting, assess:

Spare circuit breaker positions (or whether a new sub-board is required)
Existing main fuse/switch capacity for the additional load
Switchboard compliance — modifying a non-compliant switchboard may trigger obligations to upgrade it in some states

Document your switchboard assessment as part of every gas-to-electric quote. A job that looks straightforward at the front door can become significantly more complex if the switchboard is a 1970s rewirable fuse board in a tight location.

Cable Run Complexity

Gas hot water units are often located in positions chosen for gas pipe access — small external cupboards, side of house, or roof spaces. These locations frequently involve long cable runs from the switchboard, tight wall cavities, or conduit through areas with limited access.

The cable run for a heat pump installation is often the most labour-intensive and variable-cost part of the job. Site-visit pricing for gas-to-electric conversions is strongly recommended — quoting blind from customer descriptions of the property layout is a recipe for margin loss.

Location of the Heat Pump

Heat pump hot water systems need:

Adequate air volume — minimum 10–15m³ of surrounding space (check manufacturer specification). Small external cupboards built for gas units often don’t meet this requirement.
Ambient temperature above 5–10°C — heat pumps lose efficiency at very low ambient temperatures. External installation is generally preferred for year-round performance; internal installation in unconditioned spaces (garages, utility rooms) can work in most Australian climates.
Drainage — heat pumps produce condensate that must drain away. The existing location may or may not have suitable drainage.

In practice, many gas-to-electric conversions require the heat pump unit to be relocated from the existing hot water position. Budget relocation costs into your quote — and ensure your plumbing partner is briefed on the new location requirements.

Plumbing Requirements

Gas-to-electric hot water conversion involves significant plumbing work:

Disconnection and capping of the gas supply (gas plumber required)
Removal of the existing gas unit
Installation of the new heat pump tank
Connection of cold water inlet, hot water outlet, pressure relief valve, and expansion vessel
Condensate drainage connection

Coordinate with a licensed plumber. In most jurisdictions, a gasfitter must disconnect and cap the gas supply — this is not electrical work. Your plumbing partner’s schedule is often the bottleneck for gas-to-electric conversion jobs; build their lead time into your booking process.

The Rebate Landscape for Gas-to-Electric Conversion

Gas-to-electric hot water conversion attracts multiple layers of rebates and incentives. Understanding all of them — and presenting them clearly to the customer — is a key sales skill.

Federal: Small-scale Technology Certificates (STCs)

Heat pump hot water systems are eligible for STCs under the “solar water heater” category of the SRES. The number of STCs generated depends on:

System capacity (litres)
Climate zone (1–5, with zone 1 tropical regions generating the most STCs)
Installation date

Typical STC value for a residential heat pump hot water installation: $400–$1,200 depending on system size and location.

STCs are typically assigned to the retailer/installer at point of sale in exchange for an upfront discount to the customer — the same mechanism used for solar PV. For the full STC creation and assignment process, see our STC claim process guide.

Victoria: Solar Homes Program Hot Water Rebate

Solar Victoria’s Solar Homes Program includes a rebate for eligible heat pump hot water systems. The rebate amount and current eligibility criteria are available at solarvictoria.vic.gov.au. The same registration requirements apply as for the solar and battery rebates — see the Solar Victoria rebate guide for installer registration details.

NSW: Energy Savings Scheme (ESS)

The NSW Energy Savings Scheme creates financial value for high-efficiency heat pump hot water installations through Energy Savings Certificates (ESCs). ESC creation requires accreditation under the ESS. For electricians doing volume HPHW work in NSW, ESS accreditation is worth pursuing — the certificate value can significantly offset the customer’s cost, making sales easier.

QLD, SA, WA

State government rebate programs for heat pump hot water exist in various forms across remaining states. Check current availability directly with the relevant state government agency — programs have changed in frequency and value in recent years.

Combining Rebates

Multiple incentives can often stack on a single installation. A typical SA installation combining STCs + SA state rebate + the HBS loan (where a battery is also being added) can represent $2,000–$4,000+ in combined customer savings. Presenting the full stacked incentive picture to the customer is a legitimate and powerful sales tool.

How to Sell Gas-to-Electric Hot Water Conversion

The most effective approach for gas-to-electric conversion differs depending on whether the customer already has solar:

For existing solar customers:

“Your solar system is generating clean energy every day that you’re currently not using to heat your hot water. Your gas hot water is costing you [estimate based on typical usage] per year and that cost is going up. A heat pump running on your solar generation would bring that to almost nothing. With the STC rebate and the [state rebate if applicable], the typical out-of-pocket is around $[X]. Most customers see a payback in 3–5 years even without factoring in gas price increases. Worth looking at the numbers for your property?”

For non-solar customers:

The conversation works differently — HPHW becomes the entry point for the broader whole-home energy conversation, and adding solar to power the heat pump is a natural next step. See our guide on how to get more solar leads in Australia for how to use HPHW as a lead-in to solar sales.

For customers with failing gas units:

An ageing gas hot water system that’s failing is a replacement decision, not a discretionary one. These customers are in a decision window and are the most responsive to a gas-to-electric conversion conversation. Build a systematic follow-up process for customers whose gas systems are approaching end-of-life — your job management system can flag this based on install date recorded at a previous job.

Pricing Gas-to-Electric Heat Pump Conversion

Component	Typical Range
Heat pump system (supply)	$1,200–$3,500
Electrical installation (circuit, switchboard work)	$400–$1,500
Plumbing installation (partner)	$400–$900
Cable run (variable by property)	$200–$1,500+
STC discount (applied at sale)	($400)–($1,200)
State rebate (where applicable)	($300)–($1,000+)
Typical customer out-of-pocket	$1,500–$4,500

Site visit pricing is strongly recommended. The cable run variability alone can swing a job by $800–$1,500 — and gas-to-electric conversions frequently surface switchboard work that wasn’t visible in the initial phone enquiry.

Track every gas-to-electric job through a proper workflow — STC lodgement, state rebate documentation, and the plumbing partner coordination all need to be tracked against the same job record. The hidden admin cost calculator shows what happens to margin when this coordination happens on spreadsheets and phone calls rather than in a job management system.

Got a question about gas-to-electric conversion compliance or rebates? Ask Tradie Brain AI free → Instant answers on HPHW rebates, STC eligibility, state schemes, and electrical compliance requirements. No login required.