2024's In-Depth Hot Water System Reviews: Find Your Perfect Match

Which hot water system is the best for your home? Like many homeowners, you probably seek a blend of efficiency, reliability, and cost-effectiveness. Our hot water system reviews tackle these points head-on, comparing top brands and models to guide you to the ideal choice for your specific needs. Discover the right balance for your household as we analyze and rank the leading options on the market.

Key Takeaways

  • The hot water system market offers diverse choices from multiple reputable brands, providing options for electric, gas, solar, and heat pump systems, with specific features to address varying household needs.

  • Understanding different types of hot water systems - storage tanks, continuous flow, solar, and heat pumps - is crucial for making an energy-efficient selection that fits specific usage patterns, household size, and climate conditions.

  • In choosing the right hot water system, factors such as system sizing, budget, energy efficiency, warranty, installation, and possible government rebates must be considered to maximize benefits and ensure long-term savings.

Hot Water System Brands Overview

When it comes to hot water systems, the market is filled with a variety of hot water system brand options, each offering unique features and benefits. Some renowned brands include:

  • Rheem

  • Rinnai

  • Solahart

  • Dux

  • AquaMAX

  • Vulcan

  • Thermann

  • Bosch

These brands have established their reliability in the industry, providing a wide range of hot water options to cater to every household’s needs.

Whether you’re after gas hot water systems, electric hot water systems, or even solar or heat pump options, these brands have you covered.


Renowned for its diverse range of hot water systems, Rheem offers the following options:

  • Electric models

  • Gas models

  • Heat pump models

  • Solar models

The Rheem Continuous Flow gas range is specifically noted for its high performance, offering options from 12L/min for apartments to 27L/min for heavy usage. Their systems are energy-efficient, affordable, lightweight for easier installation, and come with substantial warranties, making Rheem a reliable choice for both residential and commercial applications.


Rinnai offers a comprehensive range of hot water systems, including continuous flow, solar, and storage options. Their continuous flow systems, ranging from 16L to 32L per minute, incorporate PureTemp™ technology for stable hot water temperatures.

What’s more, Rinnai provides advanced temperature controllers allowing users to manage their hot water temperature precisely, catering to individual household needs.


Specializing in solar hot water systems, Solahart offers premium ranges like the Streamline MCS07V, with sizes from 270L to 410L. Their solar water heaters can reduce water heating energy use by up to 75% in certain areas, with boosters ensuring hot water availability during cloudy days or high demand.

With strong customer satisfaction ratings and free on-site solar assessments, Solahart helps households make the most of their solar gain.


Dux offers a diverse range of hot water system solutions to cater to various consumer needs. Their product line includes:

  • Heat pumps

  • Continuous flow

  • Electric solar

  • Gas water heaters

  • Electric storage systems

  • Gas storage systems

Dux focuses on energy efficiency across their varying types of hot water systems, ensuring you get the most out of every energy dollar.


AquaMAX is recognized for its production of gas and electric storage hot water systems. The company offers a range of options to suit different needs and preferences. As an alternative to premium gas systems, AquaMAX provides Electric Vitreous Enamel (VE) water heaters. With a four-star rating across all categories for their hot water systems, AquaMAX ensures quality and performance in every unit.


Vulcan offers both gas and electric hot water systems. Their products are designed with durability and efficiency in mind, making Vulcan a reliable choice for households seeking a balance between performance and affordability.


Thermann offers a diverse range of hot water systems including:

  • Storage tank

  • Continuous flow

  • Solar

  • Heat pump

Their hot water system capacities span from as small as 16L to as large as 400L, making it suitable for different household sizes and water usage demands, including those with a hot water heater.

Thermann also offers environmentally friendly options with their solar hot water systems, designed to utilize renewable energy, thus reducing energy costs.


Bosch hot water systems are designed with the user in mind. They include user controls allowing owners to adjust temperature and flow, catering to individual preferences and needs. The range of capacities for Bosch hot water systems includes 10L, 13L, and 16L models, making them adaptable to various household sizes and hot water demands.

With the Bosch Internal Compact model designed to fit inside the home, Bosch caters to households with limited installation space.

Types of Hot Water Systems

Different types of hot water systems

hot water systems come in various types, each designed to suit different household needs and preferences. The primary categories include:

  • Storage tank systems, which store hot water for use

  • Continuous flow systems, which provide hot water on demand

  • Solar hot water systems, which use the power of the sun to heat water

  • Heat pump systems, which use electricity to move heat from one place to another.

We shall examine each of these systems in more detail to understand their functionalities and benefits better.

Storage Tank Systems

A storage tank system stores hot water for when it’s needed. They come in a variety of sizes to cater to different household needs, but they may have slower heat recovery times, leading to delays in re-heating water after the stored supply runs out. Despite this, they are a popular choice due to their simplicity and reliability.

However, the choice between a gas or electric system can influence the needed tank size, given that gas systems heat water more quickly and may not require as large a reserve of pre-heated water as electric systems.

Continuous Flow Systems

Continuous flow hot water systems, also referred to as tankless or on-demand systems, deliver hot water only when it is required, significantly reducing standby heat loss. They are generally more energy-efficient than traditional tank systems, offering potential for lower energy bills and reduced greenhouse gas emissions. One popular option among homeowners is the gas hot water system, which provides a reliable and energy-efficient solution for their hot water needs.

With an extended lifespan of up to 20 years and warranties ranging from 10 to 12 years, continuous flow systems, also known as continuous flow system, offer a robust and long-term solution for your hot water needs.

Solar Hot Water Systems

Solar hot water systems, also known as solar hot water system, use solar collectors on the roof, such as flat plate or evacuated tube collectors, and a storage tank to heat water. These systems can offer significant energy savings, accounting for up to 75% reduction in water heating costs. Not only are they efficient, but they also reduce household greenhouse gas emissions considerably.

Though the initial investment may be higher, long-term savings and an increase in property value make them a worthwhile investment.

Heat Pump Systems

Heat pump hot water systems have several advantages over traditional electric water heaters:

  • They are up to three times more energy-efficient, as they use electricity to move heat from the air or ground into the water.

  • They can lead to significant energy savings over time, despite their higher initial cost.

  • They function optimally in moderate to warm climates.

However, it’s important to note that their efficiency may decrease in cold water, especially during colder weather.

Hot Water System Sizing Guide

The size of your hot water system can significantly impact its performance and your household’s comfort. To ensure you have enough hot water when you need it, it’s essential to get a system that’s the right size for your household. Several factors affect the sizing of a hot water system, including the number of people in the household, the number of showers or outlets, and the household’s water usage habits.

We shall examine these factors in greater detail.

Household Size and Usage

The size of your household and your water usage habits play a pivotal role in determining the appropriate size for your hot water system. For an accurate assessment, a supplier will evaluate the total number of permanent residents, estimate the average daily hot water usage per person, and consider the frequency of visitors.

Individual water usage habits, such as the duration and timing of showers, can significantly impact the required size of the hot water system tank.

Energy Efficiency and Running Costs

Energy efficiency and running costs are another critical consideration when determining the size of a hot water system. More efficient systems can deliver the same amount of hot water as larger, less efficient systems. Thus, they can lead to significant energy savings over time.

For instance, heat pumps, when used correctly, can be cost-effective due to their high efficiency and can even surpass 300% efficiency when combined with solar panels.

Buying Tips and Considerations

Choosing the right hot water system for your home is a significant decision and one that should be made carefully. Apart from considering your household’s specific needs and the system’s energy efficiency, you also need to think about your budget and the system’s environmental impact.

We shall examine some of these factors in greater detail.

Budget and Pricing

Budget and pricing vary depending on the type and size of the hot water system. While electric hot water systems offer a lower upfront price, gas hot water systems, despite their higher initial cost, can lead to potential savings with a smaller gas system.

Although heat pumps have higher initial costs, they can result in rapid cost savings over time due to their significantly lower energy consumption.

Warranty and Lifespan

Considering the system’s warranty and lifespan is fundamental when choosing a hot water system. Warranties vary among brands and types of hot water systems, with storage water heater tanks typically offering warranties ranging from 5 to 10 years.

On the other hand, heat pumps are known for their longevity and often last up to 20 years or more, offering significant cost savings over time.

Installation and Maintenance

Proper installation and routine maintenance are essential for optimal system performance and longevity. Licensed professionals must be employed for the installation of hot water systems to ensure safety, adherence to local regulations, and maintain the validity of warranty claims.

Regular maintenance is also key, with different systems requiring service at varying intervals.

Rebates and Incentives

Installing an energy-efficient electric hot water system can be beneficial not only for your wallet but also for the environment. Governments frequently provide rebates and incentives for the installation of such systems, helping to offset the upfront costs. From the Small-scale Technology Certificates (STCs) program to state-specific incentives like VEECs in Victoria and ESCs in New South Wales, there’s a plethora of financial incentives available for choosing energy-efficient hot water systems.


Choosing the perfect hot water system might seem like a daunting task, but armed with the right knowledge, it doesn’t have to be. Whether you choose Rheem, Rinnai, or another trusted brand, whether you opt for a storage tank system or a continuous flow one, you can be confident in your decision. Remember to consider your household’s specific needs, the system’s energy efficiency, your budget, and the system’s environmental impact. With a little research and careful consideration, you can find a hot water system that is the perfect match for your home.

Frequently Asked Questions

What is the most efficient small hot water system?

Consider investing in a heat pump water heater, which is 2-3 times more energy efficient than storage electric hot water systems, and suitable for areas with mild to hot climates. It's available in split and integrated types and extracts heat from the ambient air outside to heat the water.

Which is better Rheem or Dux?

Considering support to the plumbing industry, Rheem is generally a better choice than Dux. Rheem should definitely be part of your decision-making process when buying a water heater.

Which hot water system is best in Australia?

Thermann, Rinnai, AquaMax, and Bosch are considered some of the best hot water system brands in Australia.

What should I consider when choosing a hot water system?

When choosing a hot water system, consider your household's specific needs, energy efficiency, budget, and environmental impact to make an informed decision.

What are the advantages of a continuous flow system?

Continuous flow systems offer energy efficiency, an unlimited supply of hot water, and a space-saving compact size. Enjoy these advantages when considering this system for your needs.

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