Heat pump hot water in Melbourne

Victoria's electrification rules apply to every gas hot water system in an existing Melbourne home when it is replaced. If you are in Melbourne, the practical questions are what to do when the gas unit dies, how to get every discount, and which model copes with a Melbourne winter.

Do heat pumps work in a Melbourne winter?

Yes, with the right model. At Olympic Park the July mean minimum is 7.6°C, and the older long-term record at the Melbourne Regional Office station averaged 6.0°C (BoM). That is close to the 5°C line below which energy.gov.au says not all models are designed to work. The CER puts the CBD (3000 to 3115) in heat pump zone 4, and some outer Melbourne postcodes in zone 5 (CER postcode zones).

The Victorian Government's buyers guide suggests looking for products "that can operate in colder conditions without the use of a booster element", insulating all water pipes, and considering frost protection (VEU buyers guide). See cold climates for what to look for on a spec sheet.

What changes for Melbourne homes in 2027?

From 1 March 2027, existing homes can't install a new mains gas hot water system. If a gas system breaks and can't be repaired, or is replaced for any other reason, the replacement must be electric, unless an exemption applies (energy.vic.gov.au). Rentals face a stricter standard. From 1 January 2027, new homes with a building permit issued on or after that date must be all-electric (energy.vic.gov.au). Full detail on the 2027 rule page.

What rebates can Melbourne households get?

• VEU discount: up to $560 replacing gas, $630 replacing electric, through an accredited provider. Private rentals are eligible.
• Solar Homes rebate: up to $1,000, or $1,400 for an eligible locally made product, for owner-occupiers with combined income under $150,000 and a property under $3 million. Solar Victoria showed 684 rebates left in the current release on 2 November 2026 (Solar Victoria).
• Federal STCs at the zone 4 or zone 5 figure for your postcode.

The government puts VEU plus Solar Homes at up to $1,560 off a gas replacement, or $1,960 with a locally made product. See Victorian rebates.

How do I keep running costs down in Melbourne?

Victoria's Midday Power Saver has offered no-cost electricity from 11am to 2pm since 1 October 2026, up to 24 kWh a day, for households with a smart meter who sign up. The government estimates savings of $149 to $428 a year depending on how much use households shift, and names electric water heaters as a load to move into the window. Prices outside the window may be higher on that offer (energy.vic.gov.au). The government says replacing gas hot water with a heat pump saves up to about $400 a year. For a Melbourne winter, heating at midday also means heating in the warmest part of the day.

Where should a heat pump go on a Melbourne block?

Victoria's Building and Plumbing Commission says heat pumps must go in well-ventilated areas, typically outdoors, away from bedrooms and where they won't disturb neighbours (BPC). EPA Victoria's residential noise rules put hot water systems and heat pumps in the group that must not be heard in a neighbour's habitable room before 7am or after 10pm on weekdays, or before 9am or after 10pm on weekends and public holidays (EPA Victoria). On tight inner-suburban blocks, that makes daytime timers and careful siting important. See the noise guide.

Who can install it in Melbourne?

A BPC-licensed plumber with water supply accreditation, plus refrigeration accreditation for a split system with refrigerant pipework, and a licensed electrician for electrical work. Removing a gas heater counts as gasfitting. The plumber issues a compliance certificate above the monetary threshold. Use the installer checklist.