The instantaneous electric hot watersystem or continuous flowelectric hot water is a very rare fixture in Queensland. A great optionto limit the amount of cold water through the tap before it becomes hot. The electric continuous hot water unitis extremely small and require no external drainage so you can have oneinstalled on each bathroom, under each kitchen sink and each laundry cupboardfor the most water wise way of a hot shower. One at every wet room is abig task though unless it's a brand-new build and the plumbing and electricalis still to be run. While very small they require huge amounts electricity toheat the water as its passes to over 50 degrees. The largest electric instant hot water systemavailable on a single tariff like most of us have is 8L per minute or enoughfor a poor shower. While 8L per minute isn't much it still requires 9.5kW perhour to run, or most of a large solar and if you don't have solar that's around$2.40ph.Where three phase power is available the options quickly increase allthe wall to 27L per minute for the Stiebel Eltron range.

Instant Electric Hot Water Systems

5 products

    Efficient Warmth on Demand: Your Guide to Instant Electric Hot Water Systems

    Need hot water at the flip of a switch? Instant electric hot water systems offer this modern convenience. Our guide walks you through the benefits, installation, and costs, giving you all the insights to determine if they are the right upgrade for your home.

    Key Takeaways

    • Instant electric hot water systems are energy-efficient, providing hot water on demand without the need for a storage tank, and are particularly suitable for homes with limited space.

    • The costs of these systems range from $450 to $1,599 with lower installation costs than storage units, but one must consider the household size, frequency of use, and energy consumption for running costs.

    • Taking steps like choosing energy-efficient models, ensuring correct installation, and maintaining the system every 2-3 years can maximize the efficiency of instant electric hot water systems.

    Exploring Instant Electric Hot Water Systems

    Instant electric hot water systems, also known as electric water heaters, operate on a simple yet efficient principle - they heat water as you need it. Cold water flows through an S bend pipe equipped with a special electric heating element that heats the water as it passes through. Imagine having a personal chef who cooks only the amount you’re going to eat, when you’re going to eat. It’s that efficient!

    This technology is a significant departure from traditional water heating systems. It involves a new approach to the water heating system:

    • Heating water only when required

    • Cutting down on energy consumption and running costs

    • Making them an appealing alternative to traditional storage tank models

    Instantaneous electric hot water systems are a more efficient option compared to an electric water heater that heats a large volume of hot water and stores it for later use.

    Benefits of Instant Electric Hot Water in Your Home

    There’s a multitude of reasons why more and more homeowners are gravitating towards instant electric hot water systems. For one, these systems are highly energy-efficient. Some models, such as heat pump water heaters, consume as little as 30% of the energy compared to a conventional electric hot water system. So, you can have all the hot water you need without worrying about your energy bills skyrocketing.

    Additionally, the compact design of these systems makes them an excellent choice for homes with limited space. They can be easily installed in tight corners, freeing up valuable space that would otherwise be occupied by a bulky storage tank. But the icing on the cake is the continuous hot water supply, ensuring a continuous flow. No more juggling between laundry and showers or worrying about running out of hot water in the middle of a relaxing soak.

    Understanding Single-Phase Electric Hot Water Systems

    Having familiarized ourselves with instant electric hot water systems, it’s time to delve into the specifics of single-phase electric hot water systems. These systems operate with only one phase of electrical power, making them a bit less powerful than their three-phase counterparts but much easier to install and maintain.

    The installation process for a single-phase electric hot water system is straightforward and involves constructing a platform for the water heater, positioning the tank in the center, and carrying out basic soldering. The maintenance is also quite simple, with typical tasks including scheduling professional inspections, checking the anode rod, cleaning the air filters, and inspecting the condenser and evaporator coils.

    So if you’re looking for a reliable and easy-to-maintain hot water solution, a single-phase electric hot water system might be your answer.

    Electric Hot Water System Costs: What to Expect

    The decision to opt for an instant electric hot water system involves considering not only its features but also its costs. The typical cost of an instant electric hot water system varies between $450 and $1,599, influenced by the chosen brand and model for installation. Interestingly, these systems tend to have a lower installation cost compared to storage units, providing a cost advantage during the initial setup. However, their operating cost is significantly influenced by energy consumption.

    Annual energy costs can differ based on the system and household size, but opting for an energy-efficient model with a reliable electricity provider can help lower long-term expenses and environmental impact.

    Assessing Your Hot Water Needs

    Hot water needs vary and are not one-size-fits-all. The capacity of your hot water system should align with your household’s hot water demands. Here are some factors to consider:

    • The size of your house

    • The number of bathrooms in your home

    • The number of people living in your household

    • The frequency of hot water usage

    • The simultaneous demand for hot water from multiple outlets

    Larger houses or homes with more bathrooms typically require a system with higher capacity to meet the simultaneous demand for hot water from multiple outlets.

    To get a rough estimate of your daily hot water needs, consider that the average hot water usage per person in a household ranges from 50 to 76 litres per day. Online calculators can be handy for estimating the energy needs and costs based on your daily hot water usage patterns and the specific type of system you are considering.

    Comparing Energy Rates and Usage

    Apart from evaluating your hot water requirements, comparing energy rates and usage is also an important factor in choosing an electric hot water system. The typical energy costs for electric hot water systems vary widely, with a standard water heater typically using about 4000 watts and operating for 3-5 hours daily.

    To measure the energy usage of your instant electric hot water system, you can calculate it by multiplying the hours for which the heater is active by the price paid per kWh. Remember, the energy usage varies among different models. For instance, heat pump water heaters use 60-75% less energy than conventional electric hot water systems, making them a more energy-efficient choice.

    Installation Insights: Setting Up Your Instant Hot Water System

    Selecting an appropriate instant electric hot water system and comprehending its optimal usage is crucial, but ensuring its correct installation is of paramount importance. A properly installed system can operate at its highest efficiency, reducing heat loss and leading to energy and cost savings. Plus, it minimizes the risk of any potential damage due to incorrect setup.

    When it comes to the installation process, professional help from a plumbing company is the way to go. Professionals not only ensure proper sealing and connection of the supply pipes but also adhere to local regulations and standards. They can help you choose the best location for your system, considering factors like the distance from taps and easy access for future maintenance. Also, they can help you avoid common installation errors like dry firing, using an outdoor unit indoors, and incorrectly attaching the drain line.

    The Top Picks for Instant Electric Hot Water Systems

    Given the wide variety of instant electric hot water systems in the market, making the right choice can be challenging. But don’t worry, we’ve done some homework for you. Stiebel Eltron, Rinnai Flowmaster, and Bosch Electric Tankless are some of the top picks in this segment.

    The Stiebel Eltron instant electric hot water system is renowned for providing instant access to hot water, ensuring an uninterrupted supply for your home. On the other hand, the Rinnai Flowmaster electric hot water system is highly efficient, boasting a 5.6-star rating, and can deliver 10 litres of hot water per minute at a 25°C rise. Last but not least, Bosch Electric Tankless hot water systems are recognized for their exceptional energy efficiency, with specific models attaining energy ratings exceeding 6 stars.

    Maximizing Efficiency with Instant Electric Hot Water

    After you’ve selected and installed your instant electric hot water system, it’s important to focus on maximizing its efficiency. And, it’s not as complicated as it sounds. To start with, opt for energy-efficient models like heat pump water heaters or solar hot water systems that consume less energy.

    A correct installation can also boost your system’s efficiency, reducing heat loss and leading to energy and cost savings. Regular maintenance is equally crucial, with services recommended every 2-3 years. Some DIY maintenance tips include:

    • Scheduling professional inspections

    • Checking the anode rod

    • Cleaning the air filters

    • Inspecting the condenser and evaporator coils

    Lastly, to maximize efficiency, set the temperature to a minimum of 60 degrees Celsius for optimal performance.

    Alternatives to Instant Electric Hot Water Systems

    Although instant electric hot water systems are suitable for many households, they might not be the optimal choice for all. If you’re in a larger household or prefer lower running costs, you might want to consider alternatives like gas-powered systems, electric storage units, and heat pumps.

    Gas-powered hot water systems, for instance, offer lower running costs and higher energy efficiency as they heat water continuously rather than only when the hot tap is turned on. Electric storage hot water units, while limited by their tank capacity, are usually cheaper to install and operate compared to instant systems.

    Heat pumps, on the other hand, function by transferring heat from a cool space to a warm space, similar to how a refrigerator operates in reverse.

    Choosing the Right Provider for Your Instant Hot Water Needs

    Selecting a reliable provider for your instant hot water needs is as vital as choosing an appropriate system. The leading providers of instant electric hot water systems include:

    • Solahart

    • Chromagen

    • Rinnai

    • AquaMAX

    • Rheem

    • Dux

    • Vulcan

    • Thermann

    When selecting a provider, consider the following factors:

    • Range of products

    • Installation services

    • Warranties

    • Customer support

    A good provider will assess if an instantaneous system is suitable for your home and offer the type of system that best suits your needs. It’s also important to check whether the manufacturer provides a warranty for their products. Most manufacturers generally provide a one-year warranty from the date of purchase.

    Lastly, consider the provider’s customer service. Ensure they align with your business goals and objectives and can provide a streamlined workflow.

    Navigating Power Outages with Instant Hot Water Systems

    There are many unexpected events in life, power outages being one of them. While power outages can affect instant electric hot water systems, causing them to malfunction or reset to factory settings, there are ways to navigate these situations.

    Backup power options such as generators, campfires, UPS (Uninterruptible Power Supply), and backup batteries can help keep your system running during a power outage. If your system does get affected by a power outage, you can reset the thermostat or turn off the power supply to the water heater, wait for a few minutes, and then turn the power supply back on.

    Typically, it takes about 2 hours for an instant electric hot water system to restore full functionality after a power outage.

    Maintenance Compared: Electric vs. Other Types of Hot Water Systems

    Like any appliance, hot water systems also require significant maintenance. When it comes to electric hot water systems, the maintenance is generally easier and less frequent compared to gas or solar-powered systems.

    For an electric hot water system, it’s recommended to have a minor service every six months and a major service every five years. Regular maintenance not only ensures optimal performance but also extends the lifespan of your system.

    So whether you have an electric hot water system or any other type, remember that regular checks and servicing are essential for its smooth operation.


    In conclusion, instant electric hot water systems are an efficient, reliable, and convenient solution for your hot water needs. They offer continuous hot water, are energy-efficient, and require less space compared to traditional storage units. While they have a higher upfront cost, their lower operating costs can result in significant savings in the long run.

    Whether you opt for a single-phase system or explore other alternatives, the key is to assess your hot water needs, understand energy rates and usage, and choose a reputable provider. With the right system and proper maintenance, you can enjoy a steady stream of hot water without driving up your energy bills. So why wait? Bring home an instant electric hot water system and enjoy the comfort of hot water at your fingertips.

    Frequently Asked Questions

    Can you get instantaneous electric hot water?

    Yes, you can get instantaneous electric hot water with an on-demand system that heats water as it flows through the unit, providing an efficient and popular solution for heating water.

    Are instant electric hot water systems any good?

    Yes, instant electric hot water systems are good because they use less energy and tend to last longer due to not having a storage tank.

    What is the best electric instant water heater?

    The best electric instant water heater would be the Stiebel Eltron Tankless Water Heater. It's known for its efficiency and reliability.

    Are instant electric hot water systems more energy-efficient than traditional storage units?

    Yes, instant electric hot water systems are more energy-efficient than traditional storage units because they only heat water as needed, leading to lower energy consumption.

    How often should I have my instant electric hot water system serviced?

    You should have a minor service every six months and a major service every five years to keep your instant electric hot water system in good condition.

    Instantaneous Electric Hot Water System Running Costs

    Brands and Types of Instantaneous Electric Hot Water Systems Available

    Unlike every other genre of system where we have hundreds of options available the instant range is very small due in part to us only seeing one a year in Brisbane. While the demand and range is small we do stock the top of the range Steibel Eltron products.

    The Efficiency of an Electric Continuous Hot Water System

    One of the most efficient ways of a hot shower especially for the professional couple where hot water use at home is very limited and heating a cylinder to hold it for the day is a waste. When no hot water is being used an instant system requires no power reducing the kW required for hot water.

    Rebates for a Continuous Flow Electric Hot Water System

    Currently there are no government installation rebates for a instant electric hot water system but they are federally available for electric
    heat pump water heater
    and solar hot waters systems. For any tariff or solar PV rebates associated with a new system we recommend following up with your electricity provider or the Energex website.

    Warranties Available With Your New Instant Hot Water System

    How To Find The Right Size Continuous Flow Electric Hot Water System

    With such large power requirements there is limited options to your new instant system. For single points of use eg. a kitchenette or laundry a long way from a larger hot water service a single phase L system is a good option. Outside a single point of use three phase power is required with a 18L unit recommended for a single bathroom dwelling and for 2 bathrooms a 27L system would be needed. For 3 bathrooms plus multiple units will be required in combinations of 18 and 27L.

    Is There a Better Option For Hot Water Than an Electric Instant Hot Water System

    Instant electric systems while cost effective to install can be a hard investment to bare long term with rising electricity costs. There are though systems that are cheaper to run and maintain long term such as an electric storage unit or heat pump where space isn't an issue.

    Life Span of An Instantaneous Electric Hot Water System

    Being mainly electrical components we would expect a system to last between 7 and 10years before requiring replacement.

    Why should i buy an electric instant hot water system?

    Why choose JR for your supply and install?

    When it comes to selecting a company to supply and install your new hot water system, it can be a daunting task, especially when there are numerous options available. However, you should look no further than JR Gas & Water. With an impressive track record, a dedicated focus on hot water systems, and a passion for customer satisfaction, JR Gas & Water is the go-to choice for all your hot water needs.

    Award-winning service
    JR Gas & Water is the proud 2023 winner of the best plumbers and best home care store. This recognition is a testament to the company's dedication to providing top-notch service and exceeding customer expectations. By choosing JR Gas & Water, you can trust that you are in the hands of industry leaders who are committed to delivering the best possible results.

    Focused expertise in hot water systems
    Unlike some competitors, JR Gas & Water is a plumbing company that specializes in hot water systems. This means they have the knowledge, experience, and skills to ensure a seamless installation process. They are not electricians trying to do plumbing work, but rather experts in their field who understand the intricacies of hot water systems.

    Attention to detail
    JR Gas & Water takes pride in their attention to detail, which is evident in their hot water art showcased in their gallery. By choosing JR Gas & Water, you can rest assured that your installation will be completed with precision and care, resulting in a high-quality finished product.

    Prompt remedy in case of issues
    In the unlikely event that your hot water system stops working, JR Gas & Water is committed to providing a swift remedy. Their dedication to customer satisfaction ensures that any issues will be addressed promptly and efficiently.

    Wide network of suppliers and manufacturers
    JR Gas & Water has built a strong network of suppliers and manufacturers, which allows them to offer competitive pricing without compromising on the quality of the installation. This means that you will receive exceptional service at an affordable price.

    Thousands of installations per year
    JR Gas & Water's experience is backed by the sheer volume of installations they complete each year. This extensive experience allows them to develop expertise and knowledge that can only be gained through hands-on work.

    Exceptional online reputation
    Before making a decision, it is always advisable to do your research and read reviews from various platforms. JR Gas & Water encourages you to do this, confident that their stellar reputation will speak for itself. Their numerous positive reviews across multiple platforms are evidence of their commitment to customer satisfaction.

    Choosing a company to supply and install your new hot water system is a significant decision. By selecting JR Gas & Water, you can have peace of mind knowing that you are working with a dedicated, award-winning team that specializes in hot water systems. With their commitment to quality, exceptional customer service, and expertise in the industry, JR Gas & Water is the best choice for your hot water system installation needs.

    So, don't settle for the first choice hot water systems installer that pops up. Instead, make an informed decision by choosing JR Gas & Water – the experts in hot water system installation.

    Budget for an Instant Hot Water System Installation

    How Does A Electric Instant Hot Water System Work

    An instant electric hot water system is a popular and efficient way to heat water for residential and commercial use. It operates by heating water on-demand as it flows through the system, rather than storing hot water in a tank like traditional water heating systems.

    The system consists of several components, including an electric heating element, water flow sensor, and temperature control valve. When hot water is needed, the electric heating element is activated and heats up the water as it flows through the system. The temperature control valve ensures that the water is heated to the desired temperature and prevents it from overheating.

    The water flow sensor is another important component of the system. It monitors the rate of water flow and signals the electric heating element to activate when water is being used. This ensures that the electric heating element only heats water when it is needed, reducing energy waste and lowering operating costs.

    One of the main advantages of an instant electric hot water system is its energy efficiency. By heating water on-demand, these systems offer significant energy savings compared to traditional water heating systems. They also have a smaller footprint and take up less space compared to water tanks.

    Another advantage of an instant electric hot water system is its high flow rate. These systems are capable of delivering hot water at a higher rate compared to traditional water heating systems, ensuring that there is always hot water available when needed.

    In addition to their energy efficiency and high flow rate, instant electric hot water systems offer several other advantages. They are easy to install and require minimal maintenance, making them a cost-effective investment over the long term. They also provide a continuous supply of hot water, ensuring that hot water is always available when needed.

    However, instant electric hot water systems do have some limitations. They are dependent on electricity, so their performance may be affected by power outages or disruptions. They also have a higher operating cost compared to gas hot water systems, which may be a limiting factor for some homeowners or businesses.


    Rule of thumb is 8L for a single point of use outlet, 18L for a single bathroom house and 27L for 2 bathroom property. For three bathrooms and more a combination of units would be required.

    Lots of factors alter the price but an average for a family of 4 on a full time tariff is just over $1200pa

    We would expect a new system to last between 7 and 10 years.

    You can expect to pay anywhere from $1200 for a 8L system to $1600 for a 27L system installed with the average for a 18L system being around $1500.

    To install a hot water system for legal, performance and warranty requirements you will need to be a plumber with a restricted electrical license.

    Reviews From Our Customers


    Great prompt service and reasonable charge. Highly recommend to contact them over the phone or get a quote online, they respond super quick. I already passed your information to my friends who may need service.


    Outstanding service! Our hot water system had broken down and it was leading into the Easter weekend. JR Gas and Water went out of their way to ensure that we had hot water ASAP.


    Fast and reliable work
    Quote very detail
    Price is very reasonable
    Arrived and did the job on time
    Very friendly and answered all questions
    Certainly use them again
    High recommend JR Gas and Water
    Thank you


    The tenant had no hot water due to the hot water system failed. Found JR Gas & Water online, asked for a quote, receives the quote next day, price was very reasonable compare with another quote. Ordered the service with JR Gas & Water, new hot water system was installed the next day. Excellent service, reasonable price, very responsive, definitely will use JR Gas & Water again.


    I had not hot water. The team at JR Gas and Plumbing took my call on a weekend, provided me advice and my new hot water system was in the next week. Super knowledgeable and efficient - I am so pleased I called them and will use again and recommend to anyone wanting a professional job with a reasonable price tag.


    You wont see reviews this good anywhere else.

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