2024 Best Heat Pump Hot Water System Top 10: The Roundup

In search of the 2024 best heat pump hot water system top 10? Our direct comparison provides the most recent and innovative systems, helping you identify the perfect match for your home’s hot water needs. Expect a straightforward guide spotlighting the pinnacle of energy efficiency and user satisfaction to assist your decision-making process.

Key Takeaways

  • The top 10 heat pump hot water systems of 2024 showcase a range of options optimized for energy efficiency, heat recovery, and technology integration, targeting various household sizes and climates.

  • Significant advancements in heat pump technology include smarter controls with AI, enhanced compressors for performance in cold climates, and improved overall energy efficiency, providing up to 400% efficiency in some models.

  • When choosing a heat pump hot water system, considerations should include assessing household hot water demand, climate suitability, comparing energy efficiency ratings, and understanding the potential economic and environmental benefits of the system.

Top 10 Heat Pump Hot Water Systems of 2024

Illustration of a heat pump water heater

Let’s begin by examining the top 10 heat pump hot water systems of 2024. These systems, including:

  • Stiebel Eltron WWK302H

  • Rheem Ambiheat 270

  • iStore 270L

  • and others

Renowned for their superior efficiency and innovative features, the right hot water system, including solar hot water systems, is the cream of the crop, offering economical heating of water and significant savings on utility costs.

Stiebel Eltron WWK302H

Starting off with the Stiebel Eltron WWK302H, this high-capacity, energy-efficient heat pump stands out with its advanced technology. Designed for larger households with high hot water demands, the WWK302H boasts an impressive energy efficiency, thanks to its groundbreaking roll bond condenser technology. Its smart element heats approximately the top 80 liters of the tank, optimizing energy use.

Furthermore, it includes an active defrost function that counters evaporator icing in cold conditions, allowing it to operate efficiently at temperatures as low as -5°C without relying on an electric element.

Rheem Ambiheat 270

Illustration of Rheem Ambiheat 270 heat pump

Moving on, we have the Rheem Ambiheat 270. This user-friendly heat pump is fitted with advanced wrap-around microchannel heating technology that provides uniform and faster water heating. The tank of Ambiheat 270 is lined with Vitreous Enamel for enhanced durability and resilience against harsh water conditions.

It features a user-friendly touch screen LED display for easy operation and monitoring. The Rheem Ambiheat 270 excels in extracting heat from the surrounding air, allowing it to operate efficiently both day and night, independent of direct sunlight.

iStore 270L

Illustration of iStore 270L heat pump

Designed for larger households, the iStore 270L Heat Pump Water Heater offers the following features:

  • Utilizes surplus PV energy to provide an eco-friendly, economical hot water solution

  • Large capacity of 270L

  • Tech-savvy, allowing households to integrate their water heating system with home automation

This model can potentially save users up to $1000 a year on energy bills due to its energy efficiency and fast hot water recovery times.

Stiebel Eltron WWK222

If you’re looking for a heat pump for moderate climates and smaller homes, the Stiebel Eltron WWK222 is a great choice. This compact heat pump operates efficiently, thanks to its inverter compressor that modulates its performance according to demand.

The WWK222’s refrigerant is optimized for heat absorption, contributing to its high performance in moderate climates.

Reclaim Energy 315L CO2 Stainless Steel

Illustration of Reclaim Energy 315L CO2 Stainless Steel heat pump

The Reclaim Energy 315L Heat Pump stands out for its:

  • High efficiency

  • Advanced features

  • Capability of providing annual energy savings of up to 80% for hot water heating

  • Suitability for larger households and cold climates

Its stainless steel tank is available in both ‘tall’ and ‘squat’ variations to cater to different space requirements, and it offers standout features such as high-quality components, multiple operating modes, and fast hot water production and recovery rates.

Enviroheat 200L

The Enviroheat 200L offers:

  • A balance between its tank capacity and the amount of energy consumed, making it ideal for small to medium-sized homes

  • High energy efficiency, resulting in significant savings on utility costs

  • An innovative design with features that contribute to less energy wastage.

Rinnai Enviroflo 315

The Rinnai Enviroflo 315 provides a substantial 315-liter capacity, making it ideal for larger households. It comes equipped with energy-efficient heat pump technology, delivering hot water in a cost-effective manner.

An intuitive control panel makes the Rinnai Enviroflo 315 easy for end-users to program and manage their household hot water needs.

iStore 180L

The iStore 180L Heat Pump Water Heater offers the following features:

  • Space-saving design, ideal for installation in tight areas commonly found in apartments

  • Smaller size, but does not compromise on hot water capacity

  • Efficiently meets the needs of small households

Enviroheat 250L

With its 250-liter capacity, the Enviroheat 250L is optimal for medium-sized households that require a reliable supply of hot water. The Enviroheat 250L features high energy efficiency, which can result in greater cost savings over time.

It incorporates advanced compressor technology that works efficiently even in less-than-ideal temperature conditions.

Rheem Ambipower 180L

Last but not least, the Rheem Ambipower 180L heat pump is a quiet and compact model designed for urban areas and noise-sensitive locations. It operates at a low noise level, thanks to the use of advanced sound-dampening technologies.

This makes the Rheem Ambipower 180L an extremely quiet heat pump hot water system.

The Evolution of Heat Pump Technology

Illustration of the evolution of heat pump technology

Heat pump technology has evolved significantly over the years, with recent advancements contributing to more efficient and smarter water heating solutions. For instance, heat pumps have become more effective in cold climates, making them less affected by extreme weather conditions. Additionally, they have a smaller carbon footprint than traditional systems due to reduced fossil fuel consumption.

Let’s further explore these advancements.

Smart Connectivity and Control

One significant advancement in heat pump technology is the integration of artificial intelligence in the controllers. These smart controllers optimize energy usage and allow for ease of management. They include custom settings that enable synchronization of operational times with solar PV production, further enhancing energy savings.

Programmable thermostats also contribute to energy efficiency by maintaining precise temperature control and optimizing the heat pump’s energy usage.

Enhanced Compressor Performance

Another notable advancement is the improvement in compressor technology. Advanced compressors optimize heat pump performance in cold climates, even when temperatures fall below 0 degrees Celsius. Despite cold environmental conditions, there is ample heat available for heat pumps with advanced compressors to operate efficiently, even in temperatures below freezing.

Some heat pumps, thanks to these advanced compressors, can achieve up to 400% efficiency in converting ambient heat into hot water.

Factors to Consider When Choosing a Heat Pump Hot Water System

You should consider several factors when selecting aheat pump hot water system, such as your household’s hot water demand, the climate for optimal performance, and energy efficiency ratings. Each of these factors plays a crucial role in ensuring you select the most suitable system for your needs.

Assessing Your Household's Hot Water Demand

When selecting a heat pump system, you need to estimate your household’s hot water demand. You need to consider not only the number of residents but also guest frequency, as occasional visitors can significantly increase usage.

The number and type of water fixtures, such as showerheads, and daily usage habits, including shower length and dishwasher cycles, must also be factored into the calculation for hot water demand.

Climate Considerations for Optimal Performance

The performance of heat pumps is significantly influenced by the climate. Heat pump water heaters are more efficient and heat water faster in higher outside air temperatures. However, certain heat pump water heaters are designed to operate efficiently in cold climates, with operational ranges capable of handling temperatures as low as -5°C.

Comparing Energy Efficiency Ratings

You must consider energy efficiency when selecting a heat pump hot water system. This factor is critical in determining the overall performance and cost-effectiveness of the system. A high energy efficiency rating ensures lower energy consumption and cost savings. Heat pumps are more efficient than traditional electric or gas water heaters because they extract heat from the environment instead of heating water directly with an element, which can lead to efficiencies of up to 350 percent or more.

Installation Insights: Getting Your Heat Pump Up and Running

The efficiency and longevity of your heat pump hot water system heavily depend on proper installation. From selecting the right location to deciding between professional installation and DIY, let’s look at some key installation insights.

Selecting the Right Location

Heat pump performance and lifespan can be influenced by its location. Here are some guidelines to follow:

  • Ensure adequate space around the water heater for clear air diffusion

  • Trim vegetation at least 18 inches from all sides of the heat pump

  • The location should facilitate free air circulation and not obstruct coils

  • Heat pumps should not be installed too close to ceilings to avoid short cycling.

Professional Installation vs. DIY

While it might be tempting to install the heat pump yourself, professional installation is recommended to ensure correct setup, optimal performance, and to mitigate potential issues. Accredited Certificate Providers or specific government websites provide lists of businesses accredited for water heater installation, and it is advisable for customers to review options thoroughly before selecting an installer.

Economic Aspects of Heat Pumps: Costs and Savings

Despite their higher upfront costs, heat pump hot water systems can result in substantial savings on utility costs over time due to their energy efficiency. Let’s delve deeper into the economic aspects of heat pumps, including the true cost of ownership and government rebates and incentives.

The True Cost of Ownership

To evaluate the true cost of owning a heat pump hot water system, you should take into account both upfront and running costs. While the initial investment for a heat pump system can be substantial, homeowners can expect substantial savings on electricity bills in the long run due to the device’s high energy efficiency.

Government Rebates and Incentives

To help offset the purchase costs of heat pump hot water systems, various federal and state government rebates and incentives are available. These incentives, linked to energy efficiency approval like STC and VEEC, make certain heat pump models eligible for financial assistance, improving their affordability.

The decreasing costs of solar panels and heat pumps, when combined with these rebates and incentives, are expected to make such eco-friendly systems increasingly affordable.

Environmental Impact: Heat Pumps vs. Traditional Systems

Heat pump hot water systems have several advantages:

  • They are economical

  • They are environmentally friendly

  • They have a smaller carbon footprint compared to traditional systems

  • They are compatible with renewable energy sources

Let’s explore the environmental impact of heat pumps versus traditional systems.

Carbon Emissions and Renewable Energy

Heat pump systems use renewable thermal energy from the air instead of finite natural resources, reducing carbon emissions compared to conventional water heating methods. They can lower a home’s annual carbon emissions by as much as 4 tonnes.

Furthermore, the upgrade from less efficient water heating systems to a high-efficiency heat pump could also prevent up to 13,700 kg of carbon emissions over the next 10 years.

Insulating for Efficiency

Proper insulation is key to maintaining the efficiency of heat pump hot water systems. Insulating hot water pipes can reduce heat loss and conserve energy, especially if the hot water pipe run is long.

Different types of insulation like blanket, foam, or loose-fill can be used based on specific home requirements and the area to be insulated.

Maintenance Matters: Keeping Your Heat Pump in Top Shape

Regular maintenance is key to maintaining the efficiency and longevity of your heat pump. Regular inspections and cleaning, as well as addressing common heat pump issues, can help maintain your system’s performance and longevity.

Regular Inspections and Cleaning

Annual or bi-annual professional inspections are essential to assess and maintain the condition of heat pump water heaters. Cleaning or replacing air filters, condenser and evaporator coils, and ensuring good ventilation around the unit are key maintenance tasks.

It’s also important to monitor the system regularly for signs of leaks and address them promptly.

Addressing Common Heat Pump Issues

While maintaining your heat pump, it’s crucial to be aware of common issues that may arise and how to address them. For instance, a rumbling noise from the system often suggests sediment buildup, which can be resolved by flushing the tank. If there’s a rotten smell in the hot water, it may occur due to interaction with a magnesium anode rod, which can be fixed by replacing it with an aluminum one.

Noise Level Considerations

Noise levels should be considered when choosing a heat pump hot water system. This can help ensure a more peaceful and enjoyable living environment. Many residential heat pump hot water systems typically range from 40 to 60 decibels in noise level. Some heat pump models such as the Reclaim Energy Heat Pump are designed to offer quiet operation, averaging 37dB, which is among the lowest noise levels available.

Noise mitigation can be achieved through strategic placement of outdoor units, encasing compressors, and utilizing vibration dampers, neoprene isolation mounts, and soundproofing materials.

Advantages of Integrating Heat Pumps with Solar PV Systems

Integrating heat pumps with solar PV systems can increase solar energy utilization by 20%. Combined systems of heat pumps and solar PV can reduce the need for grid electricity during daylight hours, providing efficient heating and cooling.

Heat pumps designed to function as an effective ‘battery’ can store and utilize energy from solar PV systems, promoting a more reliable and eco-friendly energy solution.


In conclusion, heat pump hot water systems are not only energy-efficient and cost-effective but also environmentally friendly. They offer a viable alternative to traditional water heaters, providing a steady supply of hot water while reducing energy bills and carbon emissions. With advancements in technology, the integration of heat pumps with solar PV systems, and government rebates and incentives, these systems are becoming increasingly affordable for homeowners.

Frequently Asked Questions

What is the best heat pump hot water heater in Australia 2023?

The iStore 270L Heat Pump Water Heater is the top choice for 2023 in Australia due to its eco-friendly and efficient air-source heat pump technology, making it ideal for medium to large households.

What are the advantages of heat pump water heaters?

Heat pump water heaters offer significant energy savings, making them more cost-effective and environmentally friendly.

How often should heat pump water heaters be inspected and cleaned?

You should have your heat pump water heater inspected and cleaned annually or bi-annually to maintain efficiency and extend its lifespan.

Can heat pump water heaters operate in cold climates?

Yes, some heat pump water heaters are designed to operate efficiently in cold climates, with operational ranges capable of handling temperatures as low as -5°C.

What government rebates and incentives are available for heat pump water heaters?

You can benefit from federal and state government rebates and incentives to offset the purchase costs of heat pump hot water systems, which are linked to energy efficiency approval like STC and VEEC. This financial assistance makes certain heat pump models eligible for support.

Rheem AmbiHeat 270L Heat Pump Hot Water System - Installed Today
Rheem AmbiHeat 270L Heat Pump Hot Water System - Installed Today
Rheem AmbiHeat 270L Heat Pump Hot Water System
iStore 270L Heat Pump Hot Water System - Installed Today
iStore 270L Heat Pump Hot Water System - Installed Today
iStore 270L Heat Pump Hot Water System
Rheem Mpi 325L Heat Pump Hot Water System - Installed Today
Rheem Mpi 325L Heat Pump Hot Water System - Installed Today
Rheem Mpi 325L Heat Pump Hot Water System
Enviroheat 200L Heat Pump Hot Water System - Installed Today
Enviroheat 200L Heat Pump Hot Water System - Installed Today
Enviroheat 200L Heat Pump Hot Water System