Heat Pump Hot Water Systems from $2,179
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Heat Pump Hot Water Systems
Compare heat pump hot water systems by tank size, layout, noise, electrical connection, refrigerant, smart controls, recovery and current supply-only price.
Heat pump hot water systems use a refrigeration cycle to collect heat from the surrounding air and transfer it into stored water. They still use electricity to run the compressor and fan, but they can use substantially less electricity than conventional electric-resistance storage under suitable conditions.
Hot Water Outlet carries heat pumps across recognised brands including Rheem, Rinnai, Dux, iStore, Envirosun, Stiebel Eltron and Emerald Energy. This guide covers the broad buying decision: system size, all-in-one versus split, plug-in versus hardwired, noise, smart controls, refrigerant, climate, solar-PV scheduling, STCs, replacement and current prices.
How Does Heat Pump Hot Water Work?
A heat pump water heater works on the same basic refrigeration principle as an air conditioner operating in reverse. A fan draws surrounding air across an evaporator, refrigerant absorbs heat from that air, the compressor raises the refrigerant temperature and a condenser transfers the heat into the stored water.
Because the system is moving existing heat rather than creating all of the heat with an electric element, it can deliver several units of heat to the water for each unit of electricity consumed under suitable conditions. Actual efficiency changes with ambient temperature, water temperature, operating mode and model design.
Evaporator & Fan
Draws energy from the surrounding air. The system needs enough airflow around the evaporator to operate correctly.
Compressor
Raises refrigerant pressure and temperature so heat can be transferred effectively into the hot-water system.
Condenser
Transfers heat from the refrigeration circuit into the stored water through the model’s specific heat-exchange design.
Storage Tank
Stores heated water for showers, sinks, baths and other household use, just like other storage hot-water systems.
All-In-One, Split, Plug-In, Smart & Quiet Heat Pumps
Heat pumps can be grouped by physical layout and by specific features. These categories overlap: for example, an all-in-one system can also be plug-in, WiFi-enabled and designed for low-noise operation.
Tank, compressor, fan and controls combined into one appliance. Common for straightforward residential replacement.
Storage tank and heat-pump unit installed separately, providing more flexibility for tank height and compressor placement.
Selected models connect through a suitable manufacturer-approved plug and outlet rather than a permanent hardwired connection.
Selected systems add WiFi, app control, timers, solar scheduling or reduced-noise operating modes.
What Size Heat Pump Hot Water System Do I Need?
Tank size should be based on actual hot-water use rather than household count alone. A practical demand guide is around 40L per person per day for light use, 50L average, 65L high use and 80L very heavy use. Recovery then determines how quickly the tank can replace the heat that has been used.
A 270L system with strong heat-pump output and effective boost can recover differently from another 270L model. Compare tank capacity, recovery, operating modes and household demand together.
180L, 200L, 250L, 270L, 280L, 300L & Larger Heat Pumps
180L–220L
Compact heat pumps for lower-demand households, smaller families or sites where physical size is important.
250L–280L
A common middle range for family homes, balancing stored capacity with manageable physical size.
300L–320L
Higher-capacity options for larger households, multiple bathrooms, baths or frequent back-to-back showers.
330L–340L+
Large residential storage where genuinely high daily demand or longer scheduled heating gaps justify extra reserve.
Heat Pump vs Electric Storage, Gas & Solar Hot Water
| System type | How it heats water | Main advantages | Main checks |
|---|---|---|---|
| Heat Pump | Moves ambient heat into stored water using a refrigeration cycle. | Lower electricity use than conventional resistance storage in suitable conditions; no roof collectors required. | Airflow, noise, climate performance, recovery, electrical supply and condensate. |
| Electric Storage | Electric element heats stored water directly. | Simple technology, broad size range, often straightforward to replace. | Element size, tariff, tank capacity and running cost. |
| Gas Storage / Continuous | Gas burner heats stored or flowing water. | Fast recovery or continuous delivery depending on type. | Natural Gas/LPG, ventilation, gas supply and future energy costs. |
| Solar Hot Water | Roof collectors transfer solar heat into stored water with backup heating. | Uses direct solar heat and can reduce purchased energy. | Roof suitability, collectors, boost system, installation complexity and maintenance. |
Plug-In vs Hardwired Heat Pump Hot Water
Some residential heat pumps are supplied with a plug for connection to a suitable outlet, while others are permanently hardwired. Plug-in can simplify the electrical side where the existing outlet, circuit and protection already meet the manufacturer’s requirements.
Hardwired models may use different electrical input or backup-element ratings. Do not compare only compressor wattage: the complete maximum input, current and backup-heating arrangement determine the electrical requirements.
Plug-In
Useful where a suitable manufacturer-approved outlet and circuit can be provided at the heat-pump location.
Hardwired
Permanent circuit connection that may suit higher input, different boost elements or installations where an outlet is not the preferred connection method.
How Quiet Are Heat Pump Hot Water Systems?
Heat pumps contain a fan and compressor, so some operating sound is normal. Published sound levels are usually given in dB(A), but the test distance and conditions matter. A figure measured at 3 metres should not be directly compared with a figure measured at 1 metre.
Real-world noise also depends on the installation. Bedroom windows, hard walls, fences, corners and poor mounting can make a unit more noticeable. Some models include Quiet or Silent modes that reduce output and noise at the cost of slower recovery.
WiFi, Timers, Apps & Daytime Solar Heating
Many modern heat pumps include timers, WiFi or app control. Depending on the model, connected functions can include tank temperature, operating modes, boost control, schedules, energy information, alerts or estimated remaining hot water.
For homes with rooftop solar PV, scheduling water heating through the middle of the day can increase solar self-consumption. Some systems simply use timers, while others provide dedicated solar, dry-contact or smart-grid integration.
Smart controls can help the owner choose better operating times, but compressor efficiency, tank losses, climate conditions and system sizing remain major performance factors.
R290, R134a, R513a & Heat Pump Refrigerant
Current Australian heat pumps use several refrigerants depending on the model and generation. R290 is increasingly common in newer products and has a very low global-warming potential. Other current or established systems may use refrigerants such as R134a or R513a.
Refrigerant should not be used as the only measure of product quality. The complete system design — compressor, heat exchanger, controls, tank insulation, climate range, recovery, warranty and service support — determines how suitable the heat pump is for the property.
Do Heat Pumps Work in Cold Weather?
Heat pumps can operate in cool weather, but performance changes as ambient temperature falls. Different models have different minimum operating temperatures, defrost strategies and low-temperature performance. A system suitable for coastal Queensland may not automatically be the best choice for a colder inland or alpine location.
Airflow is equally important. The evaporator needs access to enough ambient air, and indoor installations require the manufacturer’s room-volume and ventilation conditions to be met. Restricted airflow can reduce performance and create unwanted cold-air recirculation.
Replacing an Electric Hot Water System with a Heat Pump
Replacing conventional electric storage with a heat pump is one of the most common upgrade paths. The existing location is a useful starting point, but heat pumps are often taller, need more airflow and require condensate drainage that a standard electric cylinder did not need.
Record the old tank size and whether the household regularly runs out of hot water.
Check height, width, access, clearances, base, plumbing and available airflow.
Confirm electrical supply, condensate route, water pressure and required valve arrangement.
Select all-in-one or split and size the system around actual demand and recovery.
Heat Pump Hot Water Rebates & STCs
Eligible air-source heat pumps can create Small-scale Technology Certificates under the federal Small-scale Renewable Energy Scheme. The exact number depends on the registered model, installation date and location, and the system must meet the scheme requirements at the time of installation.
State or territory incentives may also be available separately. Rebate eligibility should be checked against the exact model and installation rather than assuming every heat pump receives the same benefit.
Heat Pump Hot Water System Prices
Compare current available unit prices, then open the product to check stock, tank size, electrical requirements, delivery and specifications.
| Heat pump system | Current price | Purchase type | |
|---|---|---|---|
| Stiebel Eltron SHP-O 300L Heat Pump Hot Water System | $4,389 | Supply only | View |
| iStore 270L Heat Pump Hot Water System | $2,589 | Supply only | View |
| Rheem AmbiHeat 270L Heat Pump Hot Water System | $3,769 | Supply only | View |
| Rheem Ambipower 280L Heat Pump Hot Water System | $3,479 | Supply only | View |
| Rinnai Enviroflo AR-Series 300L Heat Pump Hot Water System | $4,299 | Supply only | View |
| Rheem Ambipower 180L Heat Pump Hot Water System | $3,199 | Supply only | View |
| iStore 180L Heat Pump Hot Water System | $2,229 | Supply only | View |
| Enviroheat 250L Heat Pump Hot Water System | $2,179 | Supply only | View |
| Rinnai Enviroflo GR-Series 300L Heat Pump Hot Water System | $4,469 | Supply only | View |
| Rinnai Enviroflo GR-Series 280L Heat Pump Hot Water System | $3,409 | Supply only | View |
| Rinnai Enviroflo GR-Series 215L Heat Pump Hot Water System | $2,829 | Supply only | View |
| Rinnai Enviroflo AR-Series 340L Heat Pump Hot Water System | $4,649 | Supply only | View |
| Stiebel Eltron SHP-O 200L Heat Pump Hot Water System | $4,109 | Supply only | View |
| Dux Ecosmart Pro 270L Heat Pump Hot Water System | $4,009 | Supply only | View |
| Dux Ecosmart 285L Heat Pump Hot Water System | $4,059 | Supply only | View |
| Dux Ecosmart 200L Heat Pump Hot Water System | $3,839 | Supply only | View |
| Envirosun M9 330L Heat Pump Hot Water System | $2,359 | Supply only | View |
| Envirosun M9 200L Heat Pump Hot Water System | $2,319 | Supply only | View |
| Rheem Ambipower 280L (2.4KW Hardwired) Heat Pump Hot Water System | $3,109 | Supply only | View |
| Rheem Ambipower WIFI 280L Heat Pump Hot Water System | $3,709 | Supply only | View |
| Rheem Ambipower WIFI 280L (2.4KW Plugin) Heat Pump Hot Water System | $4,069 | Supply only | View |
Product price only. Delivery, valves, fittings, pipework, installation, electrical work, disposal and other extras are separate unless expressly included with the selected product.
Heat Pump Warranty, Service & Water Quality
Heat-pump warranties are often divided between the storage cylinder, refrigeration system, compressor, electrical controls, valves and labour. A headline cylinder warranty does not necessarily mean every component has the same coverage period.
Water quality also matters. Some systems use enamelled tanks with sacrificial or impressed-current anodes, while others use stainless steel. Follow the exact manufacturer water-quality limits and maintenance requirements for the model being installed.
Condensate
Keep the condensate route clear and investigate overflow or unexpected water around the heat-pump section.
Airflow
Keep the evaporator and air path free from obstructions that can restrict normal heat-pump operation.
Valves
Relief valves and other safety components need to suit the exact pressure requirements of the selected water heater.
Model Details
Keep the model and serial number for warranty, parts, troubleshooting and future replacement matching.
Common Heat Pump Hot Water Problems
A heat pump that stops producing enough hot water does not automatically require full replacement. Power supply, timers, operating mode, temperature sensors, fan operation, compressor or refrigeration faults, boost-element faults and plumbing issues can all affect performance.
Runs Out of Hot Water
Check demand, tank size, recovery, schedules and whether the system is operating in a reduced-output mode.
Fan or Compressor Not Running
Controller settings, sensors, protection modes, electrical faults or refrigeration faults can all stop normal heat-pump operation.
Water Around the Unit
Normal condensate should be distinguished from relief-valve discharge, plumbing leaks or an actual cylinder leak.
Abnormal Noise
New rattling, vibration or major changes in fan/compressor sound can indicate mounting, debris or component issues that need investigation.
Buying a Heat Pump Hot Water System Supply Only
Choose the heat pump first, then check delivery and add only the valves, pipework, fittings or accessories required for the job. For a replacement, record the existing tank size, model, electrical supply, dimensions and installation photos before selecting the new system.
Heat Pump Hot Water System Questions
Answers to common heat pump price, sizing, efficiency, noise, refrigerant, solar, rebate, replacement and warranty questions.