Best Heat Pump Hot Water System in Australia: How to Choose the Right One

The best heat pump hot water system for your home is the one that matches your household size, hot water usage, outdoor space, electrical setup and installation location. A large family may need a bigger tank with strong recovery performance, while a smaller household may be better suited to a medium-size heat pump that is easier to place and more cost-effective to run.

Heat pump hot water systems can be a strong upgrade from older electric storage systems because they use electricity to move heat from the surrounding air into the water, rather than relying only on a traditional heating element. They can also be a practical option for homes moving away from gas, provided the property has suitable outdoor space, clear airflow, condensate drainage and electrical supply.

Installed Today offers heat pump hot water systems for customers comparing efficient hot water options online. Supply-only ordering is available across major Australian metro areas, with selected supplied-and-installed options available on eligible products in Brisbane and Gold Coast service areas where shown.

Quick Answer

The best heat pump hot water system depends on the home.

A heat pump may suit you if:

• You want an efficient electric hot water option

• You are replacing an older electric storage system

• You do not have natural gas or LPG available

• You want to reduce reliance on gas

• You have suitable outdoor space

• The location has clear airflow

• Condensate drainage can be managed

• Noise placement is suitable

• Your household usage suits a storage tank

• You want to pair hot water with solar PV where timer settings and usage suit

For many homes, a 250L to 300L heat pump is a common starting point. Customers can compare medium heat pump hot water systems from 200L to 280L or large heat pump hot water systems over 280L, depending on household demand.

What Is a Heat Pump Hot Water System?

A heat pump hot water system uses electricity and refrigeration technology to transfer heat from the surrounding air into water stored in a tank.

Instead of generating all heat directly through an electric element, the system extracts heat from the air, upgrades that heat through a compressor cycle and transfers it into the hot water cylinder.

Most heat pump systems include:

• An evaporator

• A compressor

• A condenser

• A storage tank

• A fan

• Refrigerant

• Controls

• An electric element or backup heating function on some models

Heat pump systems are often installed outdoors because they need airflow around the unit. They also need a suitable location for condensate drainage and should be placed where operating noise will not disturb bedrooms, living areas or neighbouring properties.

How Heat Pump Hot Water Systems Work

A heat pump works through a refrigeration cycle.

In simple terms:

• The system draws in outdoor air

• Heat from the air is absorbed by refrigerant

• The compressor increases the refrigerant temperature

• Heat is transferred into the water tank

• The cooled refrigerant cycles back through the system

• The stored hot water is used by showers, taps, kitchens and laundries

This process can make heat pump hot water more efficient than standard electric storage in suitable conditions.

However, heat pumps are not automatically the best option for every home. Location, airflow, tank size, electrical supply, noise placement, climate and usage pattern all matter.

Why Choose a Heat Pump Hot Water System?

A heat pump can be a good choice when you want an efficient electric storage-style system without relying on gas.

Common reasons homeowners compare heat pumps include:

• Replacing an older electric hot water system

• Reducing electricity use compared with standard electric storage

• Moving away from gas hot water

• Pairing hot water with solar PV where suitable

• Choosing a storage tank option for daily household use

• Upgrading to a modern hot water system

• Improving hot water efficiency in suitable outdoor locations

Installed Today customers often compare heat pumps against electric hot water systems, gas hot water systems and instant gas hot water systems before choosing.

Best Heat Pump Hot Water Systems to Compare

There is no single “best” model for every home. The right heat pump depends on capacity, household size, installation location, airflow, recovery rate, brand preference and product availability.

Below are some popular heat pump options customers may compare.

iStore 270L Heat Pump Hot Water System

The iStore 270L Heat Pump Hot Water System is a popular medium-to-large heat pump option for households wanting an efficient electric hot water upgrade.

A 270L heat pump can suit many family homes, depending on shower habits, number of bathrooms and daily hot water demand.

It may suit homes with:

• 3 to 5 people, depending on usage

• Suitable outdoor space

• Clear airflow around the unit

• Practical condensate drainage

• A preference for a larger tank than standard small electric units

• Solar PV where timer operation and household usage suit

Before ordering, confirm the location, access, electrical suitability and household hot water demand with a licensed installer.

Rheem AmbiHeat 270L Heat Pump Hot Water System

The Rheem AmbiHeat 270L Heat Pump Hot Water System can suit customers looking for a recognised hot water brand and a large-capacity heat pump option.

A 270L-class system may be suitable for households that use more hot water across showers, kitchens and laundries, but sizing should always be based on actual demand.

It may suit homes with:

• Higher daily hot water use

• Outdoor installation space

• Clear airflow

• Good service access

• Suitable drainage

• Electrical supply suitable for the unit

• A preference for a known hot water brand

Do not choose a larger tank only because it sounds better. Tank size should match the household’s usage pattern.

Rinnai Enviroflo V2 250L Heat Pump Hot Water System

The Rinnai Enviroflo V2 250L Heat Pump Hot Water System may suit homes looking for a 250L heat pump option from a well-known brand.

A 250L tank can suit many medium households, depending on shower length, fixture use and recovery needs.

It may suit homes with:

• Moderate household demand

• Outdoor space with airflow

• A practical drainage point

• Suitable access for delivery and servicing

• Customers comparing medium heat pump options

• Homes replacing older electric storage systems

As with any heat pump, the final choice should consider the installation location and whether the household regularly runs out of hot water.

Rinnai Enviroflo GR-Series 280L and 300L Heat Pump Systems

The Rinnai Enviroflo GR-Series 280L Heat Pump Hot Water System and Rinnai Enviroflo GR-Series 300L Heat Pump Hot Water System may suit customers comparing larger tank sizes.

These options can be worth considering where the household has higher hot water demand or multiple occupants using hot water throughout the day.

They may suit homes with:

• Larger household demand

• Multiple bathrooms

• Regular shower and laundry use

• Suitable outdoor space

• Clear airflow

• Good access

• Suitable electrical setup

• Noise placement away from sensitive areas

Bigger is not automatically better. A larger heat pump can cost more, take up more space and may be unnecessary for a lower-demand home.

Enviroheat 250L Heat Pump Hot Water System

The Enviroheat 250L Heat Pump Hot Water System may suit customers comparing 250L heat pump options for efficient hot water replacement.

A 250L heat pump can be a practical size for many homes, especially where the household wants to replace an older electric storage unit with a modern heat pump option.

It may suit homes with:

• Small to medium family usage

• Suitable outdoor airflow

• Practical drainage

• Good system access

• A replacement-focused upgrade

• Customers comparing 250L heat pump models

Before ordering, check whether the existing hot water location is suitable or whether a different outdoor position is needed.

Heat Pump Size Guide

Heat pump sizing should be based on how the home actually uses hot water.

As a rough guide:

• Smaller households may suit a 200L to 250L heat pump

• Medium households often compare 250L to 280L heat pumps

• Larger households may need 280L to 300L+ options

• High-demand homes should consider bathrooms, shower habits and simultaneous use

The right size depends on:

• Number of people in the home

• Number of bathrooms

• Shower length

• Bath use

• Kitchen and laundry use

• Time of day hot water is used

• Whether multiple fixtures run at once

• Whether the old system ran out of hot water

• Recovery time

• Outdoor location and climate conditions

Do not automatically replace the old system with the same size if it regularly ran out of hot water.

Heat Pump vs Electric Hot Water

A standard electric hot water system is often simpler and may be cheaper upfront, especially for like-for-like replacement. Common sizes include 250L electric hot water systems, 315L electric hot water systems and 400L electric hot water systems.

A heat pump can be more efficient in suitable conditions because it moves heat from the air into the water instead of relying only on direct electric resistance heating.

An electric storage system may suit:

• Simple like-for-like replacements

• Homes with limited outdoor airflow

• Tight installation areas

• Lower upfront product budgets

• Homes where heat pump noise or drainage is a concern

A heat pump may suit:

• Homes wanting a more efficient electric option

• Outdoor locations with clear airflow

• Solar PV pairing where timing suits

• Customers wanting to move away from gas

• Homes with enough space for the unit

Heat Pump vs Gas Hot Water

A heat pump uses electricity and outdoor air to heat stored water. A gas hot water system uses natural gas or LPG.

Gas hot water systems may suit homes that already have suitable natural gas or LPG. Gas options include gas storage and instant gas hot water systems.

A heat pump may be more suitable where:

• The home does not have gas

• The owner wants to reduce reliance on gas

• Outdoor tank space is available

• The electrical setup is suitable

• The household wants an efficient storage-style system

Gas may be more suitable where:

• Natural gas or LPG is already available

• Space is limited

• The home already has a compliant gas hot water location

• The customer prefers continuous flow hot water

• Gas pipe sizing and water pressure are suitable

Natural gas and LPG are not interchangeable. Gas work must be completed by a licensed gas fitter.

Heat Pumps and Solar PV

Heat pump hot water can work well with solar PV where the system can be timed to run during solar generation and the household’s usage pattern suits stored hot water.

Solar pairing depends on:

• Solar system size

• Timer settings

• Household hot water usage

• Tank capacity

• Daytime energy generation

• Whether boosting is needed outside solar hours

• Electrical setup

• Product controls

Do not assume every heat pump will automatically run from solar in the most efficient way. The setup should be checked before choosing a product based on solar compatibility.

Customers wanting connected control features may also compare Wi-Fi enabled heat pump hot water systems.

Heat Pump Rebates, STCs and Incentives

Some heat pump hot water systems may be eligible for STCs, rebates or incentives depending on the product, installation location and current program rules.

Rebates and incentives can change. Eligibility should be confirmed before relying on any discount, certificate or claim.

Do not choose a heat pump based only on a possible rebate. The system still needs to suit the home, location, tank size, airflow, drainage and electrical setup.

Installation Location: What to Check

Heat pump location is one of the most important parts of choosing the right system.

Before ordering, check:

• Is there enough outdoor space?

• Does the unit have clear airflow?

• Is the location away from bedrooms and neighbours?

• Can condensate drainage be managed?

• Is there enough access for delivery?

• Is future service access practical?

• Is the electrical supply suitable?

• Is the base stable and compliant?

• Is weather exposure acceptable for the model?

• Will pipework changes be required?

• Will the old unit need removal or disposal?

A heat pump installed in a poor location may be noisy, inefficient or difficult to service.

Brisbane and Gold Coast Considerations

Heat pump hot water can be a practical option for many Brisbane and Gold Coast homes because the climate is generally suitable for outdoor heat pump operation. However, the property still needs the right location, airflow, drainage and access.

In Brisbane, side access, older homes, valve upgrades and electrical suitability may affect replacement planning. On the Gold Coast, coastal exposure, narrow access and noise placement can also be important.

Selected supplied-and-installed options are available on eligible products in Brisbane and Gold Coast service areas where shown. Availability depends on the product, address and installation requirements.

Supply-Only vs Supplied-and-Installed

Installed Today offers supply-only ordering across major Australian metro areas. This can suit customers who already have a licensed installer organised and want to order the product online.

Selected supplied-and-installed options are available on eligible products in Brisbane and Gold Coast service areas. Availability depends on the product, address and installation requirements.

For supply-only products, the listed product price generally covers the product only.

It does not usually include:

• Installation labour

• Plumbing alterations

• Electrical work

• Gas work

• New valves

• Pipework changes

• Gas pipe upgrades

• Drainage changes

• Tempering valve upgrades

• Pressure limiting valve upgrades

• Expansion control valves

• Old unit removal

• Disposal

• Compliance upgrades

• Concrete bases or slab work

• Flue kits unless listed

• Temperature controllers unless listed

• Relocation of the system

• Rebate administration

• Site assessment

For heat pump hot water systems, also confirm outdoor location, airflow clearance, condensate drainage, electrical suitability, access, base requirements and noise placement before ordering.

Common Heat Pump Buying Mistakes

Choosing Only by Rebate Value

A high rebate does not automatically make a system the right choice. Suitability comes first.

Ignoring Noise Placement

Heat pumps can run for longer periods while heating water. Placement near bedrooms, windows or neighbours should be considered.

Not Checking Airflow

Heat pumps need clear airflow to operate properly. Tight, enclosed or poorly ventilated spaces can reduce performance.

Choosing the Wrong Tank Size

A tank that is too small can run out of hot water. A tank that is too large may cost more than needed.

Forgetting Condensate Drainage

Heat pumps produce condensate that needs to drain safely and correctly.

Assuming Solar Pairing Is Automatic

Heat pumps can pair well with solar PV, but only where timer settings, usage and electrical setup suit.

Ordering Before Installer Confirmation

Supply-only orders should be checked by a licensed installer before purchase to avoid gas, electrical, plumbing, access or location issues.

Before Ordering Checklist

Before choosing a heat pump hot water system, check:

• How many people live in the home?

• How many bathrooms are used daily?

• Does the household use long showers?

• Is the old system running out of hot water?

• Is a 250L, 270L, 280L or 300L tank more suitable?

• Is there enough outdoor space?

• Does the location have clear airflow?

• Can condensate drainage be managed?

• Is the unit away from bedrooms and neighbours?

• Is the electrical supply suitable?

• Is there access for delivery and servicing?

• Will new valves or pipework changes be required?

• Is the product supply-only or supplied-and-installed?

• Are STCs, rebates or incentives currently available?

• Has a licensed installer confirmed the system is suitable?

Frequently Asked Questions

What is the best heat pump hot water system?

The best heat pump hot water system is the one that suits your household size, outdoor location, airflow, drainage, electrical supply and hot water usage. Popular options include 250L, 270L, 280L and 300L heat pump systems, depending on the home.

Is a heat pump better than electric hot water?

A heat pump can be more efficient than standard electric storage in suitable conditions because it moves heat from the air into the water. However, electric storage may still suit simple like-for-like replacements or homes where heat pump location, airflow or noise is not suitable.

Is a heat pump better than gas hot water?

It depends on the property. A heat pump may suit homes without gas or homes wanting to reduce reliance on gas. Gas hot water may suit homes with existing natural gas or LPG, limited space and suitable gas supply. Natural gas and LPG are not interchangeable.

What size heat pump hot water system do I need?

Many households compare 250L to 300L heat pumps, but sizing depends on the number of people, bathrooms, shower habits, bath use, kitchen use, laundry use and recovery needs. The old system’s performance is also important.

Can a heat pump run on solar?

A heat pump can work well with solar PV where timer operation, tank size and household usage suit daytime running. It should be checked before choosing a heat pump based on solar compatibility alone.

Do heat pumps need outdoor space?

Yes, most heat pump hot water systems need outdoor space with clear airflow, drainage, access and suitable noise placement.

Are heat pump rebates available?

STCs, rebates or incentives may be available depending on the product, location and current program rules. These can change, so eligibility should be confirmed before relying on them.

Can I install a heat pump myself?

No. Heat pump hot water installation involves plumbing and electrical considerations. Licensed trades should complete the work where required.

Does supply-only pricing include installation?

No. Supply-only pricing generally covers the product only. It does not usually include installation labour, plumbing work, electrical work, valves, pipework changes, drainage, old unit removal, disposal or compliance upgrades unless clearly listed.

Final Word

The best heat pump hot water system is not simply the biggest tank or the model with the largest rebate. It is the system that fits your household demand, outdoor space, airflow, drainage, electrical setup and long-term hot water needs.

For many homes, a 250L to 300L heat pump can be a strong option when replacing older electric storage or moving away from gas. Smaller households may prefer a medium heat pump, while larger homes may need a larger tank with suitable recovery performance.

Before ordering, confirm the system size, location, airflow, drainage, noise placement and electrical suitability with a licensed installer.

Customers can compare heat pump hot water systems, medium heat pump hot water systems, large heat pump hot water systems and Wi-Fi enabled heat pump hot water systems online with Installed Today.