Electric to Heat Pump Hot Water: Is It Worth Upgrading?
Electric to Heat Pump Hot Water: Is It Worth Upgrading?
In most suitable homes, yes. Replacing standard electric storage with a heat pump is one of the strongest hot-water efficiency upgrades to compare first.
Both systems store hot water in a tank, so an existing electric-storage site can often provide a practical starting point. The big difference is how the water is heated: a standard electric element turns electricity directly into heat, while a heat pump uses electricity to move heat from the surrounding air into the tank. That can dramatically reduce the electricity needed for the same job.
Should I Change to a Heat Pump?
This is a preliminary guide. Final suitability still depends on the exact unit, location, electrical supply, plumbing, drainage, noise requirements and household demand.
1 What electric hot water do you have now?
2 What is the current tank location like?
3 Do you have rooftop solar PV?
Guide only. Heat-pump location, airflow, condensate drainage, compressor noise, electrical supply, tariff arrangements, tank size, recovery and local installation requirements must be checked for the selected model.
Can You Replace Electric Storage With a Heat Pump?
Yes. A conventional electric storage system can usually be replaced with a suitably sized heat-pump hot-water system where the site has enough space, airflow, drainage and acceptable noise separation. Because both are storage systems, the existing tank location, hot and cold water services and drainage can often give the conversion a useful head start.
Why a Heat Pump Is Usually the Better Upgrade From Standard Electric
Conventional electric storage is simple and proven, but it creates heat directly with an electric element. A heat pump uses a refrigeration cycle to collect heat from the surrounding air and transfer it into the stored water, so it can deliver the same hot-water service with much less electrical energy.
Much Lower Energy Use
Australian Government guidance says heat-pump water heaters use about 30% of the energy of a conventional electric hot-water system. Actual household savings still depend on the model, climate, tariff, usage and operating schedule.
Excellent With Solar PV
A heat pump can be scheduled to heat during strong daytime solar production, using far less electricity than a resistance element for the same stored-hot-water task.
Potential STC Discount
Eligible air-source heat-pump models can create Small-scale Technology Certificates when the exact system and completed installation meet current scheme requirements.
Familiar Storage Format
You still have a stored reserve of hot water. The upgrade changes the heating technology rather than forcing the home into an entirely different delivery style.
Existing Site Can Help
The old electric cylinder has already established a hot-water location with water services and often drainage nearby, subject to the selected heat pump's dimensions and clearances.
Better Long-Term Fit
Where the home is moving toward rooftop solar, batteries or broader electrification, a heat pump generally makes better use of limited household electricity than a large resistance-heating load.
Electric vs Heat Pump: Current Installed Today Starting Prices
Compare the full pathway rather than appliance price alone. A standard electric unit can be cheaper upfront, while a heat pump normally costs more to buy but uses substantially less electricity in normal operation and may have an STC pathway on eligible models.
The lower-upfront pathway and still a practical choice where a heat-pump site is genuinely unsuitable or the purchase budget is the overriding constraint.
Current Installed Today collection starting price. Product and installation inclusions vary by item, location and selected options.
Higher initial purchase cost is balanced by far lower energy use, strong solar-PV compatibility and potential certificate or state incentive pathways where eligibility applies.
Current Installed Today collection starting price. Final value depends on the exact model, order type, installation scope and any eligible incentive pathway.
Standard Electric vs Heat Pump Hot Water
| Consideration | Standard Electric Storage | Heat Pump Hot Water |
|---|---|---|
| How it heats | Resistance element converts electricity directly into heat | Refrigeration cycle transfers heat from surrounding air into the water |
| Energy use | Higher electrical demand for the same heating task | Strong advantage Around 30% of conventional electric hot-water energy use under Australian Government guidance |
| Upfront purchase cost | Usually lower | Usually higher before eligible incentives |
| Long-term running cost | Can be reduced by off-peak tariffs or solar scheduling, but still resistance heating | Usually stronger Lower energy requirement gives the heat pump a major efficiency advantage |
| Solar PV use | Can be timer controlled or diverted to daytime solar, but the element still needs roughly one unit of electricity for one unit of heat delivered into the water | Highly recommended Daytime operation can combine low electrical demand with household solar generation |
| STCs | No hot-water STCs for a conventional resistance-electric replacement | Eligible listed air-source heat pumps may qualify when scheme requirements are met |
| Noise | Very quiet heating element | Compressor and fan operate while heating |
| Airflow requirement | Minimal | Needs suitable airflow and manufacturer clearances |
| Existing tank site | Usually straightforward like-for-like | Often reusable in principle if dimensions, airflow, noise, drainage and services suit |
| Our preference if both suit | Choose mainly for lower upfront cost or site constraints | Heat pump is the recommended long-term upgrade in most suitable homes |
Your Existing Electric Tank Site Can Make the Upgrade Easier
An electric-storage home already has the basic ingredients of a stored-hot-water installation. That does not make every heat pump a direct drop-in replacement, but it can reduce how much needs to change compared with converting from a completely different technology.
Hot & Cold Water Services
Existing water connections are already located at the hot-water site, although pipe positions can need alteration to suit the new unit.
Tank Base
The existing foundation may be useful if it is level, sound, correctly sized and suitable for the selected heat pump and its loaded weight.
Drainage
Existing relief-valve drainage may help, but a heat pump can also produce condensate that needs to be discharged appropriately.
Electrical Supply
There is already power at or near the hot-water location, but the existing circuit, protection, tariff control and connection method still need to suit the chosen heat pump.
Service Access
A heat pump needs room for installation and future servicing, including access to the compressor, fan, controls and water connections.
Airflow & Noise
This is the main new consideration. A location that was fine for a silent electric cylinder may need more clearance or a different position for a heat pump.
Can a Heat Pump Use the Existing Electric Hot Water Circuit?
Sometimes, but it should not be assumed. The existing circuit is useful because power is already present at the hot-water site, yet the electrician still needs to confirm that the circuit, isolation, protection, cable size and tariff arrangement are suitable for the selected heat pump.
Existing Dedicated Circuit
Many electric storage systems already have a dedicated hot-water circuit. That can simplify the conversion where it meets the new system's requirements.
Off-Peak / Controlled Load
The old system may be controlled by a tariff relay or off-peak supply. The new heat pump's preferred operating schedule may be different, especially when solar PV is available during the day.
Isolator & Protection
Current electrical requirements and the manufacturer's instructions determine the final isolation and protective-device arrangement.
Already Have Solar PV? We Would Strongly Favour the Heat Pump
Rooftop solar makes the electric-to-heat-pump upgrade especially compelling because the heat pump can run during daylight while requiring far less electricity than a conventional resistance element.
Standard Electric + Timer
Moving a conventional electric tank into the solar-production window can reduce grid imports, but the element is still a high-demand resistance heater whenever it runs.
Electric + Solar Diverter
A Catch Power-style diverter or similar control can feed surplus PV into a resistance element, but it does not change the fundamental efficiency of the element itself.
Heat Pump + Daytime Solar
The heat pump needs much less electricity to move heat into the water, so a smaller slice of daytime PV can perform the same hot-water task and leave more solar available for the rest of the home.
If both options fit the site, we would generally choose heat pump over retaining standard electric storage with a timer or diverter. Solar control can improve when a resistance tank uses electricity, but it does not remove the resistance-heating efficiency disadvantage. During poor solar weather, evenings or periods when PV production is already being used elsewhere, the heat pump's lower electrical demand becomes even more valuable.
Can an Electric-to-Heat-Pump Upgrade Qualify for STCs or Rebates?
Eligible air-source heat-pump water heaters can create federal Small-scale Technology Certificates when the exact model is on the current register and the completed installation satisfies the scheme requirements. Some states and territories may also have additional efficiency or household-support programs.
Eligible Heat Pumps Can Receive STCs
The exact certificate entitlement depends on the approved model, installation date and geographic zone. The product and installation must meet the current scheme rules.
Extra Support Can Vary
Some jurisdictions offer additional heat-pump upgrade discounts, rebates or finance, while others rely mainly on federal STCs. Eligibility can depend on the property, existing system, postcode, household and provider.
The Product Alone Does Not Complete the Claim
If you buy supply only, confirm the STC or state-program pathway with your installer or accredited provider before installation. Product eligibility does not automatically mean every order or installation qualifies.
Do You Need the Same Tank Size as Your Old Electric System?
Not automatically. Tank litres matter, but so do recovery rate, household usage, operating schedule, climate and when the system is allowed to reheat. A heat pump should be sized as a complete hot-water system rather than matched to the old cylinder by litres alone.
Household Size
More occupants and larger peak-use periods increase the stored volume and recovery performance required.
Bathrooms & Peak Demand
Back-to-back showers, large baths and simultaneous hot-water use can be more important than average daily consumption.
Recovery Window
A system deliberately scheduled around solar PV needs enough storage and recovery to carry the household through the periods when it is not heating.
Climate
Heat-pump performance can vary with ambient conditions, so climate suitability and the selected model's operating range matter.
Backup Element
Some heat pumps include electric boosting for high demand, low ambient conditions or recovery support. How it is controlled affects energy use.
Future Household Changes
Consider growing families, renovations, extra bathrooms or changes in occupancy before selecting the smallest possible unit.
Heat Pump Noise, Airflow & Location: The Main Reasons to Check the Site Properly
The strongest argument for staying with standard electric is usually not efficiency — it is site suitability. Heat pumps have a compressor and fan, so a location that worked perfectly for a silent electric tank can need more thought.
Bedroom Windows
Avoid treating a published sound figure as the whole answer. Distance, reflections, operating times and bedroom placement all affect how noticeable the unit can be.
Close Boundaries
Tight side access between homes can amplify or redirect compressor and fan noise. A different position or quieter model may be the better solution.
Enclosed Areas
Heat pumps need access to a useful volume of air and must meet the manufacturer's clearance requirements. A small sealed cupboard that suited an electric tank may not suit a heat pump.
Condensate
Moisture removed from the air during operation needs a sensible discharge path in addition to the hot-water system's normal relief drainage.
Cold Air Discharge
The unit rejects cooler air while heating water, so the discharge direction can matter in small courtyards, covered areas or frequently used outdoor spaces.
Service Clearance
Leave practical access around the heat-pump components. A system that can be installed but cannot be serviced comfortably is not a good long-term location.
When We Would Highly Recommend Heat Pump Over Another Electric Tank
If several of the conditions below apply, the case for remaining with conventional electric gets difficult to justify on long-term energy use alone.
You Already Have Solar PV
This is one of the strongest combinations. Schedule efficient water heating into the daytime solar window and reduce the electrical load required to store a full tank of hot water.
Your Existing Tank Is Outside
An open external position with reasonable separation from bedrooms and neighbours often solves the biggest heat-pump siting concerns from the start.
The Old Unit Is Already Being Replaced
You are already paying for a new hot-water system and installation work, so this is the natural point to compare the higher-efficiency technology rather than locking in another long electric-storage cycle.
You Use a Lot of Hot Water
The more energy the household spends heating water, the more valuable efficiency can become, provided the heat pump is correctly sized for peak demand.
You Plan to Add Solar or a Battery
Lower hot-water electrical demand leaves more generation and stored energy available for other household loads.
You Expect to Stay in the Property
A longer ownership horizon gives the lower operating-energy requirement more time to offset the higher initial purchase price.
When Staying With Standard Electric Can Still Make Sense
Heat pump is our preferred upgrade when the site suits, but conventional electric storage still has legitimate use cases. The key is to choose it for a real constraint rather than simply because it matches the old unit.
Lowest Upfront Cost Is Critical
A conventional electric tank can have a much lower purchase price, which can matter for urgent replacements or tightly constrained budgets.
No Suitable Heat-Pump Location
A genuinely enclosed site, difficult airflow conditions or unacceptable compressor-noise risk can make another electric tank the more practical choice.
Very Low Hot-Water Demand
Where household usage is extremely low, the absolute dollar saving from higher efficiency can be smaller, so upfront-cost recovery may take longer.
Supply Only vs Supplied & Installed
Installed Today lets you compare heat-pump products online, with supply-only ordering across suitable Australian metro delivery areas and supplied-and-installed options where available in eligible Brisbane and Gold Coast service areas.
You Arrange the Licensed Installer
Best when you already have a suitable plumber and electrician or installer pathway arranged. Confirm the exact unit, site requirements, electrical work and any STC or state-program claim process before installation.
- Product price is for the selected product unless the listing states otherwise.
- Installation, valves, disposal and electrical changes are not automatically included.
- Confirm incentive paperwork before work begins where required.
Available on Eligible Products & Locations
Where an installed option is offered, select the heat pump and work through the installation choices shown for that product. Final suitability depends on location, access, existing services and site requirements.
- Check the product page for the included installation scope.
- Electrical conversion or circuit work may be a separate option.
- Site changes can affect final installed cost.
How an Electric-to-Heat-Pump Conversion Usually Works
The exact scope depends on the existing tank and selected model, but the decision process should be simple: confirm the site, choose the right heat pump, check the electrical setup and then complete the plumbing and commissioning correctly.
Assess the Existing Site
Check tank position, access, airflow, drainage, noise separation, water connections and electrical supply.
Size the Heat Pump
Match storage capacity and recovery to the household rather than automatically copying the old electric tank litres.
Confirm Electrical Requirements
Determine whether the existing circuit and tariff arrangement can be reused or needs to be altered for the selected model.
Install & Commission
Remove the old tank, complete plumbing and electrical work, set controls, confirm operation and complete any eligible certificate pathway.
Electric to Heat Pump Hot Water FAQs
Is it worth replacing electric hot water with a heat pump?
In many suitable homes, yes. Heat-pump water heaters use substantially less electricity than conventional resistance-electric storage. The upgrade is particularly attractive when the existing tank is already due for replacement, the home has rooftop solar PV or the current outdoor location is suitable for a heat pump.
How much electricity does a heat pump use compared with electric storage?
Australian Government guidance says heat-pump water heaters use about 30% of the energy of a conventional electric hot-water system. Actual results vary by model, climate, household usage, water temperature, tariff and operating schedule.
Can a heat pump go where my electric hot water tank is now?
Often, especially when the current tank is outdoors in an open area. The new position still needs to meet the selected heat pump's dimensions, airflow, noise, drainage, electrical and service-clearance requirements.
Can a heat pump use the existing electric hot water circuit?
Sometimes. Existing power at the hot-water site is useful, but the circuit, cable, protective devices, isolator, connection method and tariff control must be checked against the selected heat pump's requirements.
Is a heat pump better than electric hot water if I have solar panels?
Usually, this is one of the strongest heat-pump use cases. Both can be scheduled into the solar-production window, but the heat pump needs far less electricity to heat the same stored water, leaving more rooftop-solar generation available for other household loads.
What about keeping electric storage and adding a solar timer or diverter?
A timer or solar diverter can improve when the electric element runs and may increase solar self-consumption. It does not change the underlying resistance-heating efficiency. Where a heat pump also suits the property, we generally prefer the heat pump because it requires much less electrical energy for the same hot-water task.
Do heat pumps make noise?
Yes. Heat pumps use a compressor and fan while heating, so model selection and location matter. Check the manufacturer's sound data and consider distance from bedroom windows, neighbours, courtyards and reflective walls.
Can a heat pump get STCs when replacing electric hot water?
Eligible air-source heat-pump models can create Small-scale Technology Certificates when the exact system is on the current register and the completed installation meets the scheme requirements. The entitlement varies by model, installation date and location.
Should I choose the same litres as my old electric tank?
Not automatically. Heat-pump sizing should consider household size, peak shower demand, recovery performance, climate, operating schedule and any solar-PV strategy rather than simply copying the old cylinder capacity.
When would standard electric still be the better choice?
Standard electric can still make sense when the lowest possible upfront cost is essential, the property has no practical heat-pump location, compressor noise cannot be managed or site changes would be disproportionate. If the decision is otherwise close, we would normally favour heat pump.
Can I buy a heat pump supply only from Installed Today?
Supply-only ordering is available on suitable products and delivery areas. You should have your licensed installer confirm the model, site, electrical requirements and any incentive claim pathway before installation. Supplied-and-installed options are also available on eligible products and locations.
Replacing an Electric Tank? Compare Heat Pump Before You Buy Another One
If the property has a suitable location, heat pump is the upgrade we would compare first. It keeps the familiar stored-hot-water format while cutting the electricity required for water heating, pairing extremely well with rooftop solar and opening the door to eligible STC or state incentive pathways.
