Instant Gas Hot Water Service Benefits
Types of Hot Water Services
When it comes to hot water services, there are two main types commonly found in Australian homes: instantaneous hot water systems and storage hot water systems. Each type has its own distinct features and benefits, catering to different needs and preferences.

Instantaneous Hot Water Systems
Instantaneous hot water systems, also known as tankless or continuous flow water heaters, have gained popularity in Australia due to their energy efficiency and the convenience of never running out of hot water. These systems heat water on-demand, without the need for a storage tank. When a hot water tap is turned on, cold water flows through the unit, where it is rapidly heated and delivered immediately.
One of the key advantages of instantaneous hot water systems is their energy efficiency. Unlike storage hot water systems, which continuously heat and store water in a tank, instantaneous systems only heat the water that is needed. This eliminates the standby heat loss associated with storage systems, resulting in greater energy efficiency and long-term energy savings.
In addition to energy efficiency, instantaneous hot water systems are known for their space efficiency. These systems are compact and mounted on the wall, making them ideal for homes with limited space or aesthetic concerns. Their compact size also eliminates the need for a bulky storage tank, freeing up valuable space in the home.
Benefits of Instantaneous Hot Water Systems
When it comes to hot water services, instantaneous hot water systems offer several advantages over other types of systems. Let’s explore the key benefits of choosing an instantaneous hot water system for your home in Australia.
Energy Efficiency
Instantaneous hot water systems are highly energy-efficient compared to storage hot water systems. Unlike storage systems that constantly heat and store a large amount of water, instantaneous systems only heat the water that is needed, resulting in greater energy efficiency and long-term energy savings. This efficiency is achieved by the system’s ability to heat water on demand, eliminating the standby heat loss associated with storage systems.
By choosing an energy-efficient instantaneous hot water system, you can reduce your carbon footprint and contribute to a more sustainable future.
Space Efficiency
For homes with limited space or aesthetic concerns, instantaneous hot water systems are an ideal choice. These systems are compact and mounted on the wall, eliminating the need for bulky storage tanks that can take up valuable space in your home. The space-saving design makes them suitable for apartments, small houses, and other properties where space is at a premium.
The compact nature of instantaneous hot water systems also allows for more flexibility in installation. They can be conveniently installed in tight spaces, such as utility rooms or even under sinks, without compromising on functionality.

Continuous Hot Water Supply
One of the significant advantages of instantaneous hot water systems is their ability to provide a continuous supply of hot water. Unlike storage systems that are limited by the size of the storage tank, instantaneous systems heat water as it flows through the system, ensuring a consistent and endless supply of hot water. This makes them particularly useful for households with high hot water demand, large families, or multiple bathrooms.
Whether you need hot water for a long shower, running multiple appliances simultaneously, or filling a bathtub, an instantaneous hot water system will deliver hot water whenever you need it, without the risk of running out.
Considerations for Choosing a Hot Water Service
When selecting a hot water service for your home, there are several important factors to consider. These include household size and hot water usage, budget, and energy efficiency. Taking these considerations into account will help you choose the right hot water service that meets your needs and preferences.
Household Size and Hot Water Usage
One of the primary factors to consider when choosing a new hot water service is the size of your household and the amount of hot water you typically use. A larger household with more occupants will generally require a hot water system with a higher capacity to ensure an adequate supply of hot water for all members.
To determine the appropriate capacity, you can consider factors such as the number of bathrooms, the frequency of hot water usage, and the simultaneous use of hot water in your household. This information will help you select a hot water service that can meet your household’s hot water demands without running out of supply.
Budget
Budget is another crucial consideration when choosing a hot water service. The cost of hot water systems can vary based on the type of system, installation requirements, and ongoing maintenance expenses. Instantaneous hot water systems may have a higher upfront cost compared to storage hot water systems. However, it’s important to note that while the initial investment may be higher, instantaneous systems can save money in the long run due to their energy efficiency.
When determining your budget, consider not only the initial purchase and installation costs but also the long-term energy and maintenance expenses associated with the hot water service. It’s advisable to strike a balance between your budget and the efficiency and performance of the system.
Energy Efficiency
Energy efficiency is a critical consideration when choosing a hot water service, as it can impact both the environment and your energy bills. The average Australian home spends a significant portion of its energy bill on hot water. Opting for an energy-efficient hot water system can help reduce your carbon footprint and save on energy costs.
Different types of hot water systems have varying levels of energy efficiency. For instance, heat pump systems and solar hot water systems are known for their high energy efficiency, while electric storage systems can be less efficient.
Instantaneous vs. Storage Hot Water Systems
When it comes to choosing a hot water system for your home, two common options in Australia are instantaneous hot water systems and storage hot water systems. Let’s compare these systems based on energy consumption, size and installation differences, as well as cost.
Energy Consumption Comparison
Hot water consumption is a significant contributor to energy usage in Australian homes, accounting for 25% of total energy usage. Instantaneous hot water systems have the advantage of greater energy efficiency compared to storage hot water systems.
This is because instantaneous systems only heat the water that is needed, resulting in minimal energy wastage. They do not have standby heat loss like storage systems, which constantly heat and maintain a tank full of water.
Size and Installation Differences
In terms of size, instantaneous hot water systems have a smaller footprint compared to storage systems. Instantaneous systems do not require a bulky storage tank, making them more space-efficient, especially for homes with limited space. On the other hand, storage hot water systems require space for the tank, which can vary in size depending on the household’s hot water needs.
Installation requirements also differ between the two systems. Instantaneous systems typically require access to a gas supply or three-phase power, depending on the model and type. Storage systems, on the other hand, require space for the tank and may need additional plumbing for the supply and drainage of water.
Cost Comparison
The cost of installing an instantaneous hot water system is generally higher compared to that of a storage hot water system. Instantaneous systems involve more complex installation processes, such as connecting to a gas supply or three-phase power.
However, despite the higher upfront cost, instantaneous systems can lead to long-term energy savings due to their energy efficiency.
Storage hot water systems, while typically cheaper to install, may have higher ongoing energy costs due to standby heat loss and the continuous heating required to maintain the temperature of the stored water. The cost comparison between the two systems will depend on factors such as energy tariffs, usage patterns, and the specific models chosen.
Popular Hot Water System Brands in Australia
When it comes to choosing a hot water system for your home in Australia, there are several reliable and reputable brands to consider. These brands have established themselves in the market and offer a range of hot water systems to suit different needs. Let’s take a closer look at some popular hot water system brands in Australia.
Rheem
Rheem is widely recognized as one of the most reliable hot water system brands in Australia. In fact, a survey conducted by Choice in 2020 found that Rheem topped the list in terms of reliability. Rheem offers a variety of hot water systems, including both instantaneous and storage options, catering to the diverse needs of Australian households. With a focus on energy efficiency and durability, Rheem hot water systems are a popular choice among homeowners.
See more about Rheem hot water service trouble shooting
Dux
Dux is another well-known brand in the Australian hot water system market. Known for its reliability and quality, Dux offers a range of hot water systems suitable for different household sizes and requirements. Whether you need an instantaneous system or a storage tank, Dux has options to meet your needs.

Aquamax
Aquamax is a popular hot water system brand in Australia, offering a range of efficient and reliable products. With a focus on energy efficiency and durability, Aquamax hot water systems are designed to provide hot water consistently and efficiently. Aquamax offers both instantaneous and storage options, ensuring there is a suitable solution for every household.

Rinnai
Rinnai is a well-established brand in the hot water system industry, known for its innovative technology and reliable products. Rinnai offers a wide range of hot water systems, including both gas and electric options. With a focus on energy efficiency and performance, Rinnai hot water systems are designed to provide consistent and reliable hot water. Whether you prefer an instantaneous system or a storage tank, Rinnai has options to suit your needs. See more about Rinnai Hot water service trouble shooting

Installation and Requirements for Instantaneous Hot Water Systems
When it comes to installing instantaneous hot water systems, there are specific considerations and requirements that need to be taken into account. Two important factors to consider are flow rates and gas pressure, as well as three-phase power considerations.
Flow Rates and Gas Pressure
Instantaneous hot water systems require a minimum flow rate to activate the heating process and deliver hot water. The minimum flow rate needed typically ranges from 2.4 liters per minute to 10 liters per minute . It is essential to ensure that the flow rate in your home meets the requirements of the chosen system to guarantee optimal performance.
In addition to flow rates, the gas pressure also plays a crucial role in the operation of instantaneous hot water systems. The gas pressure requirement for these systems usually ranges from 1.13 kilopascals (kPa) minimum to 6 kPa maximum. It is important to ensure that your gas supply meets the necessary pressure requirements to ensure efficient and reliable operation of the system.
Three-Phase Power Considerations
For larger instantaneous hot water systems in Australia, three-phase power may be required. Three-phase power refers to a type of electrical power supply that provides three alternating currents. This power supply is commonly used for appliances that require higher power output.
While most instantaneous hot water systems in Australia are electric, the use of three-phase power is more common in larger systems. If you are considering installing a larger electric instantaneous hot water system, it is important to check whether your property has access to three-phase power. Consulting with a qualified electrician can help determine the suitability of your electrical setup for this type of hot water system.
Maintenance and Lifespan of Instantaneous Hot Water Systems
When it comes to the longevity and performance of your instantaneous hot water system, regular maintenance is key. With proper care, these systems can provide hot water efficiently for many years.
Longevity of Instantaneous Hot Water Systems
Instantaneous hot water systems are known for their durability and extended lifespan compared to storage hot water systems. On average, these systems can last around 20 years, providing reliable hot water supply throughout their lifespan. This extended lifespan can be attributed to the absence of a storage tank, which eliminates the risk of corrosion and deterioration that can impact traditional storage systems.
To maximize the lifespan of your instantaneous hot water system, it’s important to adhere to regular maintenance practices.
Maintenance Tips for Optimal Performance
- Flush the system: Over time, sediment and mineral buildup can occur within the system, affecting its efficiency and performance. It is recommended to flush the system annually to remove any accumulated debris. Consult the manufacturer’s instructions or seek professional assistance to ensure proper flushing.
- Check and clean filters: Instantaneous hot water systems are equipped with filters that help prevent debris from entering the system. Regularly inspect and clean these filters to ensure they are free from clogs or blockages. Refer to the manufacturer’s guidelines for proper filter maintenance.
- Inspect for leaks: Periodically check for any leaks or drips around the system, including fittings, valves, and pipes. Addressing leaks promptly can prevent water damage and maintain the system’s efficiency.
- Monitor water pressure: Keep an eye on the water pressure of your hot water system. If you notice a significant decrease in pressure, it may indicate a blockage or issue within the system. Contact a professional plumber to investigate and resolve the problem.
- Schedule professional servicing: While regular maintenance can be performed by homeowners, it is also essential to schedule professional servicing at least once every few years. Professional plumbers can assess the overall condition of the system, identify potential issues, and perform any necessary repairs or replacements.
By following these maintenance tips, you can ensure that your instantaneous hot water system operates efficiently and provides a continuous supply of hot water throughout its lifespan. Remember to consult the manufacturer’s guidelines and seek professional assistance when needed to maintain the system’s optimal performance.
Remember, the lifespan of your instantaneous hot water system can vary depending on factors such as usage, water quality, and regular maintenance. Taking proper care of your system can help extend its lifespan and ensure a reliable hot water supply for years to come.
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