Hot water heating accounts for around 23% of the average Australian household energy bill, making it one of the most significant ongoing costs behind heating and cooling.
Reliable hot water access plays a vital role in household comfort, hygiene, and daily routine. Choosing a trusted brand with proven performance ensures fewer breakdowns, better energy control, and long-term cost efficiency.
The most important buying considerations are performance in Australian weather, parts availability, warranty strength, and technology. Some brands are engineered specifically for Australian standards, offering resilience in heatwaves, frost-prone areas, or remote installations.
Each household has unique needs, whether that’s rapid heat recovery, low energy use, or low maintenance. Durability, support, and reputation should guide every decision when upgrading or installing new systems.
Hot Water System Types and How They Work
Every new hot water system in Australia falls into one of two categories: storage or continuous flow. Storage systems use a water tank to hold heated water, while continuous flow models heat water only when needed, without a tank. Each setup suits different household demands.
Key fuel types:
- Gas hot water systems offer fast heating and are ideal for households with high usage.
- Electric hot water systems are common and lower-cost upfront but may incur higher running costs.
- Solar hot water systems use roof-mounted panels and are well suited to sunny regions with roof space.
- Heat pump systems draw heat from ambient air, making them highly energy-efficient in mild climates.
System sizes and suitability:
- Small homes may use a 50–125L tank or a compact continuous flow system.
- Larger households often need a 250–400L tank or multiple bathroom-rated units.
- Pressure ratings vary, but most mains-pressure systems deliver consistent flow across multiple taps.
Energy and water efficiency:
- All new hot water systems carry an energy rating label (stars) that helps estimate running costs.
- Water efficiency labels on continuous flow models show how much water is used per minute.
- Higher-rated units cost more initially but offer lower long-term energy use.
Zoned Energy Rating Label (ZERL)
In Australia, water heaters are labelled with a Zoned Energy Rating Label (ZERL). This system helps buyers compare the energy performance of different models based on their installation climate zone. The label is mandatory for electric, gas, solar, and heat pump systems sold in the country.
Key points of the ZERL system:
- Star Ratings: Systems receive between 1 and 10 stars. More stars indicate better energy efficiency.
- Climate Zones: The label shows energy use in three zones—hot, average, and cold. This reflects real-world performance depending on your location.
- Annual Energy Use: This displays estimated yearly energy use (in kWh or MJ) and provides a cost guide.
- Model Info: This includes the brand, model number, fuel type, and capacity to help with accurate comparisons.
ZERL makes it easier to choose a system that suits both your home and climate, ensuring lower ongoing energy use.
Hot Water System Brands to Check
Eight trusted Australian hot water brands deliver reliable hot water across the country. Explore the different types of hot water systems to help choose the right hot water system for your home and plan a smooth installation.
1. Rheem
Rheem hot water systems top the sales charts. Their range includes gas storage, electric hot water, solar, and hot water heat pump options designed for Aussie homes. Storage tanks keep water hot and ready, while continuous flow systems deliver instant hot water to every tap.
2. Thermann
Manufactured in Japan, Germany, and Australia, Thermann supplies electric heat pump split systems, storage tank models, and instant gas hot water units. Backed by robust warranties and strong local support, a Thermann hot water system is known for efficiency and dependability.
3. Rinnai
Rinnai hot water systems showcase advanced engineering. Their continuous flow hot water system maintains a steady temperature, while electric storage, hot water heat pump, and instant gas models provide efficient choices for any household.
4. Dux
Dux hot water systems are popular with families. Available as gas or electric water heaters, they offer various water storage capacities. High recovery rates ensure the hot water heater is always ready to meet demand.
5. Aquamax
Aquamax stands out with stainless steel tanks that fight corrosion. Their electric water storage, split system heat pump, and solar models each feature a reliable water storage tank, offering efficient hot water solutions for any setting.
6. Bosch
Bosch specialises in instantaneous hot water systems and innovative hot water units. Their instant gas hot water models are ideal for quick heating, delivering hot water only when needed and helping reduce water usage.
7. Everhot
Everhot delivers affordable continuous flow hot water, along with traditional electric hot water system options. Durable parts and proven design ensure consistent water supply day and night.
8. Solahart
Solahart remains a market leader in solar hot water system sales. Roof-mounted solar collectors heat water stored below, making Solahart a top choice for sunny regions and reinforcing its reputation as a trusted Australian brand.
The Top Hot Water System Picks in Australia
Some systems stand out across performance, build, and adaptability. These options cover everything from advanced tech to long-term durability.
1. Most Reliable Overall: Rheem
The Rheem hot water system delivers across electric, gas, solar, and heat pump models. Trusted in all regions and known for consistent hot water.
2. Best Heat Pump: Thermann
Thermann heat pump systems use smart design and strong recovery. Ideal for those looking to install a heat pump hot water system built for efficiency.
3. Smart Tech Features: Rinnai
Rinnai hot water systems include smart temperature control and app connectivity. Perfect for households needing controlled hot water per day output.
4. Budget Performance: Dux
Dux hot water systems are reliable and well-priced. A practical choice when replacing a gas hot water setup or installing a new unit.
5. Rural Reliability: Bosch
Bosch offers instant gas hot water for rural homes. Strong build and low maintenance make them a dependable option for remote properties.
5. Long Tank Life: Aquamax
Aquamax tanks are made from stainless steel to extend service life. Great for storage systems needing durable hot water per use.
Choosing the Right Heat Pump Hot Water System
Choosing the right hot water system depends on matching household needs with performance and setup. These systems use air to heat water, offering efficient hot water solutions year-round.
Sizing based on family size:
- A household of 2–3 typically needs 160–250L
- Larger families using more hot water per day may require 300L or more
- Hot water per person depends on shower habits, washing needs, and appliance use
Noise, space, and position:
- Most electric heat pump hot water units produce moderate noise during operation
- Outdoor installation works best with good airflow
- Avoid placing units near bedrooms or close to boundaries
Efficiency and technology:
- Look for higher star ratings for reduced energy use
- Advanced heat exchange technology improves performance in colder months
- Compare types of water heaters when replacing a gas hot water system
Recommended brands:
- Rheem, Thermann, and Rinnai offer leading solar and heat pump systems
- Each brand delivers electric or gas hot water options and electric hot water storage
- Ideal when upgrading hot water storage systems or replacing older models to get a hot water system that suits the home
Choosing the best model means balancing budget, layout, and usage across different types of hot water.
What Makes a Brand the Best Hot Water Choice?
Choosing the best hot water system to replace an ageing or faulty unit depends on more than just the model or price. Brand reliability, efficiency, and long-term performance define true value in any Australian household.
1. Durability and Long-Term Reliability
Hot water systems are usually expected to last 10 to 15 years without major failure. Systems built with quality components and tested for Australian weather deliver consistent performance, whether heating hot or cold water. A durable tank and stable recovery system ensure your home always has access to 50L of hot water or more, depending on household size.
2. Spare Parts and Support
Easy access to spare parts and reliable service agents makes a major difference. When parts are available locally, repairs are faster and often cheaper. This support network becomes vital for homes that use a lot of hot water, especially when dealing with urgent replacements or high-use periods.
3. Efficient Technology and Smart Compatibility
Heat pump systems use outside air and refrigerant to get a hot water heat boost, consuming less power than conventional models. The system can save you money on energy costs over time, especially for households needing hundreds of litres of hot water per day. Many models also support smart home integration, allowing better control over usage.
4. Installation and Replacement Flexibility
Installation costs and complexity vary across models. Compact options are suitable when space is limited, while large tanks work better in homes with multiple bathrooms. For those replacing a gas hot water system, modern heat pump or electric models offer a clean and efficient switch.
5. Trade Reputation and Warranty
Top brands are trusted by licensed plumbers across Australia. Their systems are known for consistent performance, clear instructions, and warranty terms that cover both parts and labour, giving peace of mind and value over the life of the system.
Hot Water You Can Count On
Reliability, efficiency, and strong warranties separate the best from the rest in Australia’s hot water market. Whether upgrading an outdated unit or fitting out a new build, choosing a trusted brand saves time, money, and hassle in the long run. Every household deserves consistent hot water, even in harsh weather or peak demand.
All Kind Gas & Plumbing installs and services a wide range of trusted hot water system brands. Our licensed team can help you select and install the right system for your home and budget. Contact us today to arrange an inspection or quote.
Frequently Asked Questions and Answers
1. What is the most trusted hot water brand in Australia?
Rheem is widely considered the most trusted hot water brand, offering a full range of systems backed by strong warranties and local support.
2. How long should a hot water system last in Australia?
Most quality systems last 10–15 years with proper maintenance. Stainless steel tanks and well-installed systems often last longer.
3. Is a heat pump water heater worth it?
Yes, especially for energy-conscious homes. They use less power over time and are eligible for rebates in some states.
4. Which brand is best for solar hot water?
Solahart is a top choice for solar systems in sunny regions, offering durable panels and efficient tank storage.
5. Are instant hot water systems reliable?
Brands like Rinnai and Bosch provide highly reliable instantaneous systems with temperature control and low maintenance needs.
