iStore heat pumps
Top ratings from Product Review
iStore heat pumps have achieved top scores from Product Review for four years running. Currently, they score 4.8 out of 5 stars.
iStore heat pumps extract thermal energy from the air and use it to heat water. Thus, unlike traditional electric hot water systems which use electricity to directly heat water – a very energy-intensive process – iStore and other heat pumps are highly cost-effective. iStore heat pumps :
- Draw on premium Australian engineering skills to capture energy in the air to generate environmentally friendly hot water throughout the wet areas of your home
- Are designed for Australian conditions
- Consume 75% – 85% less energy than conventional hot water systems.
- External wrap around heating coil provides maximum thermal energy transfer.
- Operate down to minus 5°C, making them ideal for cold climates
- Use an active defrost function maintains operation in cold climates automatically
- Feature a single piece design for ease of installation
- Are ideal to operate with rooftop solar PV systems
The efficiency of iStore heat pumps means that your hot water heating bill will be very low, especially if you have a rooftop solar system. Over a number of years, your iStore heat pump will pay for itself. You can slash your hot water electricity bill by around 60% compared to a traditional electric hot water system.
This cost-saving is achieved by the advanced heat pump technology used in iStore heat pumps. All of the energy used to heat water comes from the surrounding air. It just takes a small amount of electricity to run the fan and the heat pump mechanism.
Electricity-based renewable hot water systems are the way of the future, and they are rapidly slashing the cost of household water heating. Find out more here.
Premium efficiency and performance
Offering premium efficiency and performance, the iStore 180 litre Air to Energy heat pump is the perfect choice for smaller homes that want the best in hot water all year round, while the iStore 270 litre heat pump neatly matches the needs of households of 3-5 people.
- iStore’s premium Australian engineering captures energy in the air to generate environmentally friendly hot water to multiple taps in your home – 24×7 x 365
- The iStore uses advanced technology to store 4 kW of heat energy for every 1 kW of power consumed
- The iStore consumes 75% – 85% less energy than conventional hot water systems
- External wrap around heating coil provides maximum thermal energy transfer
- The iStore offsets 2.9 tonnes of CO2 per-annum on an Australian average home
- All-in-one integral unit, the iStore is easy and quick to install.
Water heating cost comparison
Heating hot water for your home accounts for up to a quarter of your electricity costs for the average Australian household.
The iStore reduces hot water heating consumption by two thirds from conventional electric or gas storage systems, while reducing CO2 emissions by 2.9 tonnes.
Installing an iStore could save you up to $1,000* per year on your energy bills.

Low weekly running costs
Heating hot water for your home accounts for up to a quarter of your electricity costs for the average Australian household.
The iStore reduces hot water heating consumption by two thirds from conventional electric or gas storage systems, while reducing CO2 emissions by 2.9 tonnes.

Here’s how it works
- A fan draws in air, containing heat energy, across the evaporator
- The evaporator turns the liquid refrigerant into a gas
- The compressor pressurises the refrigerant into a hot gas
- The hot gas inside the condenser coil heats the water inside the coil-wrapped tank
- The refrigerant reverts back to a liquid after heating the water and continues to the evaporator for the process to start again
Product specifications 180 litre iStore
| Heating capacity | kW | 3 |
| Water tank capacity | L | 180 L |
| Power input | kW | 0.58 |
| Running current | A | 2.5 |
| Power supply | 240V | ~/50H z |
| Rated outlet water temp. | °C | 60 |
| Air volume | m³ / h | 700 |
| Noise @ 1 m | dB (A) | 46.6 |
| Water inlet / outlet size | BSB / mm | 20 |
| Back up element | kW | 1.5 |
| IP Rating | X4 |
| Height | 1956 mm |
| Diameter | 540 mm |
| Height to water inlet | 60 mm |
| Height to water outlet | |
| Hot water condensation | 1240 mm |
| Height to PTR valve. | |
| Height to anode | 1140 mm |
| Net weight | 93 kg |
| Cylinder | 5 years |
| Refrigeration & electrical | 5 years |
| Valves or Accessories | 1 year |
Product specifications 270 litre iStore
| Heating capacity | kW | 3 |
| Water tank capacity | L | 180 L |
| Power input | kW | 0.58 |
| Running current | A | 2.5 |
| Power supply | 240V | ~/50H z |
| Rated outlet water temp. | °C | 60 |
| Air volume | m³ / h | 700 |
| Noise @ 1 m | dB (A) | 46.6 |
| Water inlet / outlet size | BSB / mm | 20 |
| Back up element | kW | 1.5 |
| IP Rating | X4 |
| Height | 1956 mm |
| Diameter | 540 mm |
| Height to water inlet | 60 mm |
| Height to water outlet | |
| Hot water condensation | 1240 mm |
| Height to PTR valve. | |
| Height to anode | 1140 mm |
| Net weight | 93 kg |
| Cylinder | 5 years |
| Refrigeration & electrical | 5 years |
| Valves or Accessories | 1 year |
Instantaneous gas vs heat pump water heater in Sydney, one gas appliance only1
| Hot water system type | Household size and daily hot water usage | Electricity consumption kWh/year | Gas consumption MJ/year | Electricity $/kWh incl. GST | Gas $/MJ incl. GST | Gas supply charge p.a.$ | Total cost |
|---|---|---|---|---|---|---|---|
| Gas instantaneous water heater (5 stars) | Very small – 68 L/day (1 shower/day, dishes handwashed) | 68 | 6360 | 0.27 | 0.0325 | 220 | $445.06 |
| Small – 136 L/day 2-3 showers, dishes handwashed | 68 | 12716 | 0.27 | 0.0325 | 220 | $651.63 | |
| Medium – 200 L/day 3-4 showers, dishes handwashed | 71 | 18700 | 0.27 | 0.0325 | 220 | $846.92 | |
| Efficient heat pump water heater | Very small – 68 L/day (1 shower/day, dishes handwashed) | 444 | – | 0.27 | – | – | $119.88 |
| Small – 136 L/day | 887 | – | 0.27 | – | – | $239.49 | |
| Medium – 200 L/day | 1291 | – | 0.27 | – | – | $348.57 |
1 Data sources are Pitt & Sherry (2012) Running costs and operational performance of residential heat pump water heaters
www.pittsh.com.au/assets/files/CE%20Showcase/Residential_heat_pump_water_heaters.pdf
Energy Consult Pty Ltd (2010), Estimated hot water system running costs in Victoria, prepared for Sustainability Victoria
www.solarthermalworld.org/content/estimated-hot-water-systemrunning-costs-victoria-2010
Alternative Technology Association 2014, Are we still cooking with gas?
http://www.ata.org.au/wp-content/projects/CAP_Gas_Research_Final_Report_251114_v2.0.pdf
AGL Energy Price Fact Sheet 1 Sept 2016; AGL Gas Energy Price Fact Sheet 7 Oct 2016.
Instantaneous gas water heater vs heat pump in Canberra, one gas appliance only1
| Hot water system type | Household size and daily hot water usage | Electricity consumption kWh/year | Gas consumption MJ/year | Electricity $/kWh incl. GST | Gas $/MJ incl. GST | Gas supply charge p.a.$ | Total cost |
|---|---|---|---|---|---|---|---|
| Gas instantaneous water heater (5 stars) | Very small – 68 L/day (1 shower/day, dishes handwashed) | 68 | 7,090 | 0.18 | 0.03 | 252 | $476.94 |
| Small – 136 L/day 2-3 showers, dishes handwashed | 68 | 14,189 | 0.18 | 0.03 | 252 | $689.91 | |
| Medium – 200 L/day 3-4 showers, dishes handwashed | 71 | 20,620 | 0.18 | 0.03 | 252 | $883.38 | |
| Efficient heat pump water heater | Very small – 68 L/day (1 shower/day, dishes handwashed) | 570 | – | 0.18 | – | – | $102.60 |
| Small – 136 L/day | 1,139 | – | 0.18 | – | – | $205.02 | |
| Medium – 200 L/day | 1,772 | – | 0.18 | – | – | $318.96 |
Data sourced from Pitt & Sherry (2012) Running costs and operational performance of residential heat pump water heaters
www.pittsh.com.au/assets/files/CE%20Showcase/Residential_heat_pump_water_heaters.pdf
Energy Consult Pty Ltd (2010), Estimated hot water system running costs in Victoria, prepared for Sustainability Victoria
www.solarthermalworld.org/content/estimated-hot-water-systemrunning-costs-victoria-2010
Alternative Technology Association 2014, Are we still cooking with gas?
http://www.ata.org.au/wp-content/projects/CAP_Gas_Research_Final_Report_251114_v2.0.pdf
AGL Energy Price Fact Sheet 1 Sept 2016; AGL Gas Energy Price Fact Sheet 7 Oct 2016.
