iStore 270L Heat Pump
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The iStore 270L is an advanced hot water system designed to deliver a consistent and efficient supply of hot water, powered by solar energy. Leveraging innovative air-to-energy technology, the iStore functions not only as a water heater but also as a cost-effective alternative to traditional battery storage, maximising the use of excess PV energy.
Key Benefits:
Optimises solar energy usage by storing excess power as hot water
Significantly reduces electricity bills
Lowers household carbon emissions
Enhances property value
Eligible for various Federal and State Government incentives
Efficient Battery Alternative
Instead of feeding surplus solar power back to the grid or into costly batteries, the iStore 270L channels unused PV energy into heating water for daily use. This process increases the overall efficiency of your solar system while delivering substantial savings, making it a smart and sustainable energy solution for any home.
Model number: PASHW015-270-FL02-R290
How the iStore System Works
The iStore 270L uses advanced air-to-energy heat pump technology to efficiently convert ambient air into hot water. Here’s how the process works:
Air Intake – A fan draws in ambient air containing heat energy and directs it across the evaporator coil.
Heat Absorption – The evaporator transforms the liquid refrigerant into a gas by absorbing heat from the air.
Compression – The compressor increases the pressure and temperature of the gas, creating a hot refrigerant.
Heat Transfer – The hot gas flows through the condenser coil, transferring heat to the water in the coil-wrapped tank.
Cycle Reset – After heating the water, the refrigerant condenses back into a liquid and returns to the evaporator, ready to repeat the cycle.
Temperature Control – This process continues until the target water temperature is reached.
Automatic Restart – When hot water is drawn from the tank and the temperature drops below 45°C, the system automatically restarts the cycle to maintain supply.
Key Benefits of the iStore 270L
Economical Operation
Features four intelligent operating modes, including:
Hybrid Mode – Ideal for times of increased hot water demand, such as when guests are visiting
Vacation Mode – Maintains efficiency while you're away
Efficient Thermal Transfer
Designed with an external wrap-around heating coil to ensure maximum heat transfer and faster water heating.
Quick & Simple Installation
Engineered for easy setup, reducing time and complexity during installation.
Low Energy Consumption
Consumes just approximately 1000W per hour during operation.
Average run cycle: 3–4 hours per day
Total daily energy usage: 3,000–4,000 watts
Significant Cost & Energy Savings
Hot water typically accounts for up to 30% of a household’s energy use
The iStore can help cut carbon emissions by up to 4 tonnes annually, reducing both your energy bills and environmental impact.
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F.A.Q
Frequently Asked Questions
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How does a heat pump hot water (HPHW) system work?
The Sanden Eco® Plus heat pump hot water (HPHW) system operates like a refrigerator in reverse. It contains a fan that forces air through an evaporator that contains a refrigerant. The heat in the ambient air passes through the evaporator (note: even air below 0 º C contains heat energy) and is absorbed by a natural refrigerant, R744 (aka CO2), which is ozone friendly and does not significantly contribute to global warming compared with most other refrigerants (older style refrigerants have thousands of times more global warming impact for the same amount of gas, when compared with CO2).
The warm gaseous refrigerant is circulated in the system via a compressor. As it passes through the compressor, its pressure rises, as does its temperature. This hot refrigerant then passes through a heat exchanger to heat the water, which is finally pumped to the storage tank.
iStore 270L – Smart, Efficient Hot Water Storage
Economical & Adaptive Operation
Equipped with four intelligent operating modes, the iStore adapts to varying household needs.
Hybrid Mode is ideal during periods of high demand, such as when guests are present.
Vacation Mode maintains efficiency when the home is unoccupied.
Durable, High-Performance Design
Built for longevity, the iStore features an all-copper external wrap-around heating coil and dual anodes, ensuring superior thermal transfer and enhanced system lifespan.
Quick Installation
Engineered for ease of installation, the iStore enables faster setup, reducing installation time and cost.
Highly Energy Efficient
During the air-to-energy heating cycle, the system operates at approximately 500 W per hour, providing efficient water heating with minimal power consumption.
Significant Energy & Emissions Savings
Hot water heating can represent up to 30% of total household energy use in Australia.
The iStore helps reduce CO₂ emissions by up to 2.9 tonnes annually, contributing to a lower carbon footprint and reduced energy bills.
Market-Leading Performance
With a Coefficient of Performance (COP) of 4.37 at 20°C ambient temperature (heating from 15°C to 60°C), the iStore 270L delivers 4.37 kW of heating output for every 1 kW of electricity consumed, highlighting its exceptional energy efficiency.
Technical Specifications
Product Specifications | ||
| Heating capacity | 4.0 | kW |
| Water tank capacity | 270 | L |
| Compressor power input | 0.85 | kW |
| Compressor running current | 3.6 | A |
| Power supply | V | 240 |
| Compressor number | 1 | Quantity |
| Compressor | Rotary | Type |
| Rated outlet water temp. | 60 | °C |
| Air volume | 1000 | m³/h |
| Noise - Anechoic Chamber | 47 @ 1m | dB(A) |
| Water inlet / outlet size | 20 | mm |
| Auxilary Electric Booster | 1.0 | kW |
| Rated Power Input | 2.38 | kW |
| Rated Current Input | 9.9 | A |
Dimensions | |
| Height | 2005 mm |
| Diameter | 640 mm |
| Height to water inlet | 99 mm |
| Height to water outlet | 1194 mm |
| Hot water condensation | |
| Height to PTR valve | |
| Height to anode | 1094 mm |
| Net weight | 133kg |
Warranty Information | |
| iStore Glass Lined Tank | 5 years |
| Refrigeration & electrical (controller and sensor leads) | 5 years |
| All other components | 1 year |
Home Owner Maintenance
Temperature and Pressure Relief valve PTV/PTR (all tanks)
The iStore Hot Water system is fitted with an 850kPa PTR Valve, which is located on the side of the cylinder and is essential for its safe operation. It is important that you operate the lever on the PTR valve for a few seconds once every 6 months. It is important you release the lever gently so the valve seat is not damaged.
Expansion Control Valve (ECV) (if applicable)
In some states and local councils, the installation of an Expansion Control Valve (commonly referred to a cold-water expansion valve) is required to be installed. If this valve is fitted, follow the same procedure for PTR valve as explained above.
Condensation line
Regularly inspect the condensation line to ensure water is dripping freely from the line. If the condensate drain is blocked at the discharge end, clear any debris that may have collected in the line. During normal operation, condensation occurs from the transfer of air across the evaporator coil. This process is drawing humidity from the air and creates condensation/water droplets on the coils, which in turn is captured in the fully moulded condensate tray and discharged through the condensate drain line. In locations with humidity greater than 80%, up to 5 litres per day can be expected under normal operating conditions.
Obstructions
Regularly check the no obstructions are interfering with the air in-take or air discharge. If unit is installed near shrubs or trees, keep them trimmed so they do not interfere with air flow.
Recommended iStore Servicing
2 Year Service
The recommended two-yearly service should be carried out by a licensed tradesperson. It is recommended that this service be carried out by your local iStore installer. The service should include the following:
1. Replace the anode (anodes should be replaced more frequently if subjected to hard water conditions, refer table in the warranty exclusions, iStore must be consulted regarding the replacement anode if not a genuine iStore anode). If the TDS is greater than 600PPM, the anode shall be inspected every year and replaced at intervals not greater than every 12 months
5 Year Service
1. Replace the anode (anodes should be replaced more frequently if subjected to hard water conditions, refer table in the warranty exclusions, iStore must be consulted regarding the replacement anode if not a genuine iStore anode). If the TDS is greater than 600PPM, the anode shall be inspected every year and replaced at intervals not greater than every 12 months
2. Replace the pressure & temperature relief valve. (PTR Valve)
3. Flush the water heater
4. Check and clean tempering valve filters and operation
Trouble Shooting
PROBLEM | SOURCE | EXPLANATION |
Water not as hot as previous hot water system | Tempering Valve installed | A tempering valve must be installed on every solar hot water system. Tempering valves will mix water down to 50°C. |
No Power at Screen | Circuit breaker turned off AC Isolator Turned Off Power surge | Check Circuit breaker in meter box Check AC Isolator in on position Contact iStore |
No Hot Water - 1 | Faulty Tempering Valve | Pull PTR lever and check if water is hot. If water is hot, contact a licensed plumber to replace tempering valve. |
No Hot Water – 2 | Off-Peak Tariff | Check screen to see if power is available during your nominated off-peak tariff heating times. Refer to your electricity distributor should power not be available from off-peak supply |
No Hot Water – 3 | Timer not set correctly | Ensure that timer is set to heat to your hot water demands. A secondary heating cycle maybe required if large hot water demand is used twice per day. Refer above instructions for timer settings |
Luke Warm Hot Water - 1 | Tempering Valve | Tempering valve not mixing water correctly. Contact a licensed plumber to inspect / replace the valve |
Luke Warm Hot Water – 2 | Excessive Hot Water load | Unexpected additional hot water load. Plan hot water usage to be staggered, not continuous consumption. Wait for system to re-heat. Increase timer setting if in use. |
Overflow pipe is dripping | Pressure Temperature Relief Valve (PTR) / Expansion Control Valve (ECV) where applicable. | An 850kPa and 99°C PTR valve is used on the iStore water tank, which is located on the side of the water tank and is essential for its safe operation. The PTR valve / ECV valves are designed to allow approx. 3-5% of total tank volume to discharge during heating to cater for hot water expansion |
Water pressure is slightly lower than previous hot water system | Pressure Reduction Valve (PRV) | A pressure reduction valve has been installed to limit the inlet pressure to your new iStore Water Heater. This device regulates the incoming pressure & increases life of the cylinder. This device will also protect your cylinder if the mains pressure is increased by the local water authority. |
