A third of the running cost, rebates off the invoice
Heat Pump and Hot Water System Installation
Hot water is typically the largest single energy use in an Australian home after heating. Which means the appliance quietly sitting outside your laundry, that you replace roughly once a decade and never think about, has more influence on your bills than almost anything else you own.
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The short answer
A heat pump hot water system uses roughly one third the electricity of conventional electric storage. In Victoria, stacked incentives from the Victorian Energy Upgrades program and federal STCs commonly total $3,000 or more, applied as a discount directly on the invoice rather than claimed back later. The property must be at least two years old, there is no income test, and a minimum customer contribution of $200 including GST applies. Pivot Trade Services installs Rheem heat pumps across Melbourne’s western suburbs.
A heat pump does not generate heat, it moves it, extracting warmth from outside air and putting it into the tank. That is why it runs on roughly one third the electricity of a conventional electric storage unit heating the same amount of water. Combined with rebates that commonly total $3,000 or more, it is the most straightforward energy upgrade available to most Victorian households.
How the rebate stacking actually works
This is the part that confuses people, so here it is plainly. Two separate incentive schemes can apply to the same heat pump installation, and they are handled differently to each other.
The Victorian Energy Upgrades program (VEU) is not a cash rebate. There is no form you fill in and no waiting for a payment. The discount is calculated based on the modelled energy savings of the specific unit going in, and it is applied directly to your invoice by the accredited provider. Federal STCs work similarly for eligible systems, again discounted at point of sale.
Stacked together, these commonly total $3,000 or more on a heat pump changeover. The exact figure depends on the model installed, the system it replaces and the modelled savings, which is why nobody can quote you a precise rebate figure over the phone without knowing what you have.
Property age
The property must be at least two years old to qualify for VEU. New builds are excluded, since the scheme is designed to upgrade existing stock.
No income test
Unlike the Solar Homes rebate, VEU has no household income cap. Eligibility is about the property and the equipment, not your earnings.
Minimum customer contribution
A minimum of $200 including GST must be paid by the customer. No compliant installation can ever be fully free, and anyone advertising one is not describing the scheme accurately.
Applied to the invoice
You never handle the rebate. You see a reduced price, sign the paperwork we prepare, and the provider claims the certificates.
Running costs and what you actually save
A conventional electric storage system converts electricity to heat at roughly one to one. A heat pump moves ambient heat rather than creating it, which is why it needs around a third of the electricity for the same hot water. That ratio is the entire value proposition, and it holds year round in Melbourne’s climate, with reduced efficiency on the coldest mornings.
The saving is larger again if you pair it with solar. Because a tank stores heat rather than electricity, running the heat pump on a daytime timer turns midday solar you would have exported at under 5 cents into hot water you would otherwise have imported at 30 to 45 cents. It is the cheapest form of energy storage most homes will ever install.
Coming off gas, the calculation depends on your gas tariff, and importantly on whether hot water is the last gas appliance in the house. If it is, disconnecting gas entirely removes the daily supply charge, which is often worth more than the usage difference.
Sizing and selection
Heat pump tanks are sized by household size and usage pattern, not floor area. A household of two with staggered morning showers has different requirements to a family of five all leaving at 8am. Undersizing produces the complaint we hear most about heat pumps: running out of hot water on weekday mornings.
Recovery rate matters as much as tank volume. Heat pumps heat more slowly than gas instantaneous or electric element systems, so the tank has to carry the household through peak demand periods rather than reheating on the fly. We size for the actual morning peak with headroom, not the theoretical daily average.
We fit Rheem heat pumps as our standard. Integrated units combine the tank and compressor in one, which suits most changeovers. Split units separate them, which helps where the old tank location will not take the extra bulk or where noise near a bedroom window is a concern.
Location, noise and condensate
A heat pump has a compressor and a fan, so it makes noise. Not a lot, comparable to an outdoor air conditioning unit, but more than the silent tank it replaces. The old location is not automatically the right new location, especially if it sits under a bedroom window or against a neighbour’s boundary.
It also produces condensate, because extracting heat from air condenses moisture out of it. That needs somewhere to drain. On a lot of older properties in Yarraville, Footscray and Newport there is no convenient drain point at the existing tank position, and that has to be solved rather than ignored.
Clearances matter too. The unit needs airflow around it to work efficiently, so tucking it into a tight side passage between two brick walls will cost you performance for the life of the system.
When a heat pump is not the right answer
We would rather say this than sell you the wrong thing. If your existing hot water service has failed today and you have no hot water, a heat pump changeover involves paperwork, possible relocation work and lead time. Sometimes the honest answer is a like-for-like replacement now.
If the only viable location is deeply shaded, tightly enclosed or hard against a bedroom wall, the trade-off may not be worth it. And for apartments and units with restricted external space and body corporate approval requirements, options are genuinely limited.
For most detached homes in the western suburbs, though, a heat pump is the right call, and the combination of a third of the running cost and rebates over $3,000 makes it an easy recommendation.
Electric storage and conventional systems
We still install and replace conventional electric storage systems where a heat pump does not suit the property or the timeframe. The same rules apply: correct sizing, a compliant circuit back to the switchboard, tempering valve compliance, and a Certificate of Electrical Safety at completion.
If you are replacing like for like, it is still worth checking whether your circuit and switchboard are in a condition to take a new unit. Old hot water circuits are frequently the oldest wiring in the house, and a changeover is the natural moment to correct that.
| Item | Detail |
|---|---|
| Running cost versus electric storage | Roughly one third the electricity |
| Typical stacked incentives | Commonly $3,000 or more |
| VEU property requirement | At least two years old |
| VEU income test | None |
| Minimum customer contribution | $200 including GST |
| How the discount is applied | Directly off the invoice, not claimed back |
| Best paired with | Solar plus a daytime heating timer |
The rebate value varies by model and by the system being replaced, so we confirm the exact figure on quote rather than estimating by phone.
What we check before quoting a changeover
- 1Age of the property, since VEU requires at least two years.
- 2What is being replaced: gas storage, gas instantaneous, or electric storage.
- 3Whether the existing location suits a heat pump for noise, airflow and clearance.
- 4Whether there is a viable condensate drain point nearby.
- 5Household size and morning peak demand, which sets tank size.
- 6Condition of the existing circuit and switchboard capacity.
- 7Whether hot water is the last gas appliance, which changes the economics.
How the job runs
- 01
Eligibility and system check
We confirm the property meets the two year requirement, identify what is being replaced, and establish which incentives apply and what they are worth on your job.
- 02
Site and location assessment
We look at clearances, noise exposure to bedrooms and neighbours, condensate drainage and the existing circuit before recommending an integrated or split unit.
- 03
Changeover
Old unit decommissioned and removed, new unit positioned and mounted, plumbing and condensate connected, electrical circuit checked or upgraded, tempering valve fitted.
- 04
Commissioning and paperwork
System commissioned, timer set to run in daylight if you have solar, Certificate of Electrical Safety issued, and the rebate paperwork lodged with the discount already reflected on your invoice.
Everything under heat pumps & hot water
Recent work
Heat Pumps & Hot Water Systems we have done around Melbourne's west
Same footprint, roughly a third of the running cost 
Airflow clearance matters more than most people expect
Photographs from our own jobs. No two switchboards, roofs or run lengths are the same, which is why we quote in writing after seeing yours.
Licensed and accredited work by a local team. Read about Pivot Trade Services or see recent jobs across the western suburbs.
Answers
Frequently asked questions
Yes. Heat pumps extract heat from ambient air well below zero, and Melbourne rarely gets close to their operating limits. Efficiency does drop on the coldest mornings, and units include an electric element for extreme conditions or rapid recovery. Across a full Victorian year the roughly one third running cost figure holds.
It is a condition of the Victorian Energy Upgrades program. Regardless of how large the calculated discount is, the customer must pay at least $200 including GST toward the installation. It exists to prevent zero-cost offers that lead to poor installations. Any advertisement offering a completely free compliant heat pump is misrepresenting the scheme.
Most straightforward changeovers are completed in a day. It takes longer if the unit needs relocating, if a condensate drain has to be run, if the existing circuit needs replacing, or if the old system is in an awkward position. We identify all of that at quote stage so the day itself is predictable.
Not exclusively, but you can get most of the way there. Setting the heating cycle to run in the middle of the day means it uses solar you would otherwise export for a few cents. On overcast days it draws from the grid. The tank acts as thermal storage, which is why this works so well without a battery.
It has a compressor and fan, so it produces noise comparable to an outdoor air conditioning unit while running, and it is silent the rest of the time. It is noticeably louder than the tank it replaces. Location choice solves this in almost every case, which is why we do not automatically reuse the old position.
Tell us when you call. A heat pump changeover involves rebate paperwork and sometimes relocation work, so it is not always the fastest option when you have no hot water today. We will be straight with you about timing and, if a like-for-like replacement is the sensible immediate answer, we will say so.
If hot water is your last gas appliance, it is usually worth it, because you stop paying the daily supply charge as well as the usage. If you still have gas cooking or gas ducted heating, keep the connection for now and revisit it when those appliances reach end of life. Abolishment is a separate process with its own cost.
Expect a service life broadly similar to other hot water systems, with the compressor being the component that determines it. Manufacturer warranties differ between the tank and the heat pump components, so read both. Keeping airflow clear around the unit and the condensate drain unblocked are the two things that most affect longevity.
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