The humble tanked gas storage hot water system is a reliable well-built piece of engineering. Though in limited options and sizes there is one to fit most requirements from single person granny flats to six bedrooms homes. Available in both natural gas and LPG hot water system options from Rinnai, Aquamax, Dux and Rheem,gas hot water systems are a great addition to any house and for those lucky enough to have natural gas to your property, you have the option of 5-Star efficiency with a gas storage water heater from the ever-popular Rheem Stellar 330. While a relatively efficient unit in terms of energy in vs hot water out gas hot watersystems can be expensive units to operate for a family with the ever-increasingcost of gas. While electricity is increasing at a similar rate you don't havethe ability to create your own gas via your rooftop like you do with electricity.

Gas Hot Water Systems

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    20 products

    Efficient Gas Hot Water System Solutions for Your Home Energy Needs

    Choosing a gas storage hot water system can be simple. This guide will explain the essentials of storage and instantaneous models—key considerations when seeking on-demand hot water with efficient energy use. Find out which type aligns with your home’s needs, and learn the ins and outs of installation and maintenance, without the jargon.

    Get reliable and affordable installation of your gas storage water heater from the experts at JR Gas and Water. Get in touch online, call 1800 161 280 or email us today!

    Key Takeaways

    • Gas hot water systems, which include storage and instantaneous models, offer energy efficiency and convenience, varying in suitability based on household size and hot water usage.

    • Energy efficiency ratings and proper assessment of hot water needs are critical in selecting the right system, with modern gas hot water systems typically having a 6-Star energy rating or better.

    • Installation and maintenance of gas hot water systems require licensed professionals, and regular maintenance is essential for system longevity and efficiency, while also considering the environmental impacts.

    Understanding Gas Hot Water Systems

    When it comes to home energy solutions, gas hot water systems are a popular choice. These systems use a gas burner and a heat exchanger to heat water on demand, offering energy efficiency and convenience. However, understanding how these systems work can be a bit tricky if you’re not familiar with the mechanics.

    Upon further examination, two primary types of gas hot water systems emerge: storage and instantaneous models. Each has its unique characteristics and advantages, depending on your specific needs and circumstances. We’ll delve into the workings of these systems, highlighting the differences between storage and instantaneous models.

    How Gas Hot Water Systems Work

    Gas hot water systems heat water through a sensor-triggered gas burner and a heat exchanger. When you open a hot tap, the system springs into action, heating the water and delivering it through your pipes. The temperature of the water is regulated by an Electronic Control Unit (ECU) that controls ignition, gas flow, and safety aspects like automatic gas cut-off.

    In gas storage systems, water is heated by a gas burner positioned beneath the storage tank. The water heats up at the bottom and rises to the top to be delivered through pipes when a tap is turned on. The temperature of the water is maintained hot at all times, controlled by an adjustable thermostat that triggers the main burner for consistent supply.

    Storage vs. Instantaneous Models

    Storage gas hot water systems are ideal for large households with high hot water demands. They have the capability to reheat a 170L tank within approximately an hour, making them a preferred choice for large families with substantial hot water requirements. However, they can suffer high heat loss in colder climates. In contrast, continuous hot water systems can provide a more energy-efficient solution for maintaining a steady supply of hot water.

    On the other hand, continuous flow or instantaneous models, also known as continuous flow units, offer continuous flow hot water, ensuring:

    • Greater energy efficiency

    • Instantaneous water heating

    • Endless on-demand hot water, ensuring a steady supply

    • Compact size, highly beneficial for homes with limited space

    • Ability to handle higher flow rates than electric models

    Selecting the Right Gas Hot Water System for Your Home

    Selecting an appropriate gas hot water system for your home is a vital step. Your selection should be based on factors such as:

    • Household size

    • Hot water usage

    • Available space

    • Overall costs

    For instance, larger households with higher demands might benefit more from gas storage systems, while smaller households may opt for tankless systems or smaller tanks.

    Accurate assessment of your hot water needs and comparison of energy efficiency ratings are key to making an informed decision. We’ll provide insights on these aspects to aid your decision-making process.

    Assessing Your Hot Water Needs

    To estimate daily hot water usage, you can:

    • Monitor your household water meter over time

    • Use devices to measure the gallons per minute flow rate at faucets and showerheads

    • Time your water usage for bathing and dishwashing

    • Consider the gallons per minute used by appliances such as washing machines and dishwashers

    The number of occupants in your home, along with identifying peak hot water usage times, can significantly determine the volume of hot water needed. Planning for future changes in your household, such as an increase in family members or additional fixtures, is also crucial. These considerations can help you determine if a larger hot water system will be required.

    Comparing Energy Efficiency Ratings

    Energy efficiency is a critical factor in choosing a gas hot water system. Here are some key points to consider:

    • Modern gas hot water systems typically have an energy rating of 6 Stars or better.

    • A higher Energy Factor (EF) indicates enhanced efficiency and lower operating costs.

    • Choosing a system with a higher EF can result in savings on your utility bills over time.

    With their ability to heat water on demand, tankless water heaters can provide energy savings of over 30 percent, eliminating the need for maintaining a hot water tank. Reviewing product information and obtaining expert advice are key to choosing an energy-efficient gas hot water system that suits your specific household needs.

    Top Gas Hot Water System Brands and Models

    Now that we’ve covered how gas hot water systems work and how to choose the right one, let’s talk about the leading brands in the market: Rinnai, Bosch, and Rheem. These brands are known for their reliability, efficiency, and innovative features.

    We’ll examine each of these in more detail.


    Rinnai’s B26 model is a standout product in the gas hot water system market. Here are some key features of the B26:

    • Compact in design yet high in performance

    • Provides a hot water delivery rate of 26L/min

    • Excellent choice for small to medium-sized households

    • Incorporates a heat exchanger to efficiently transfer heat to the water from the burning gas while keeping the two elements separate.

    Despite showing normal signs of rust and corrosion, the B26’s heat exchanger operates efficiently without leaks or a reduction in capabilities, demonstrating the model’s quality and durability. Its high-performance standards and cost-effective operation make the Rinnai B26 one of the top-performing models within its price range.


    Bosch is another reputable brand that offers a line of gas hot water systems equipped with unique and innovative features. For instance, models like the Bosch HydroPower allow users to configure temperature controls to suit varying seasonal conditions, enhancing user convenience and comfort.

    The Bosch Internal Compact is particularly noted for providing a stable temperature output while utilizing hydropower to initiate the burner. This represents Bosch’s commitment to innovative system ignition solutions that increase efficiency and reduce environmental impact.


    Having been in the hot water system market since 1939, Rheem offers a diverse product line for residential and commercial applications. For indoor use, Rheem offers models like the 135L and 170L, collectively known as the RheemPlus line, which emphasize longevity and feature a maximum temperature delivery for enhanced safety.

    Rheem offers a range of energy-efficient water heaters, including:

    • Stellar series

    • Continuous Flow series

    • Metro series

    • Pronto series

    • Hiline series

    These indoor and outdoor models come with 5 and 6 Star ratings and capacities ranging from small 12L units to large 305L tanks, offering options for households of different sizes and needs.

    Installation and Maintenance Tips for Gas Hot Water Systems

    The safety, efficiency, and longevity of your gas hot water system hinge on proper installation and regular maintenance. It’s crucial to have your system installed by a licensed gas fitter to ensure safety and compliance with regulations. Additionally, regular maintenance, such as annual inspections of the anode rod and regular draining of the system, can help maintain its efficiency and extend its lifespan.

    What are the specific professional installation requirements for these systems and how should regular servicing and maintenance be conducted? We’ll delve further into these matters.

    Professional Installation Requirements

    The installation of a gas hot water system is not a DIY job. A licensed gas fitter is required for installing these systems, and they should also be qualified to handle associated plumbing tasks. Professional plumbers can prevent installation errors such as improper soldering of fittings close to the tank or using incompatible metal pipes, which can lead to corrosion.

    To avoid ‘dry firing’ and damaging the water heater, it’s also crucial to ensure the system is filled with water before powering it on after installation or maintenance work. Taking these precautions can help ensure the safety and longevity of your system.

    Regular Servicing and Maintenance

    Regular maintenance can significantly extend the lifespan of your gas hot water system. In fact, with proper care, some systems can last up to 12 years or more. However, gas hot water systems generally have higher maintenance requirements than solar hot water systems, primarily due to the gas burners and associated complex components.

    Yearly inspections by a licensed plumber are crucial to ensure that all components of the system, including the heating element and operating unit, are functioning correctly. This can significantly reduce the likelihood of breakdowns and help achieve the upper end of the system’s lifespan, affecting the long-term value and frequency of replacement.

    The Environmental Impact of Gas Hot Water Systems

    While gas hot water systems are known for their efficiency and convenience, it’s important to consider their environmental impact. Gas storage hot water systems emit minimal greenhouse gases, positioning them as an eco-friendly option for home water heating. However, they do contribute to carbon emissions, which is a concern.

    How do gas hot water systems measure against electric and solar options regarding environmental impact, and can solar compatibility boost their efficiency? We’ll investigate these queries.

    Comparing Gas to Electric and Solar Options

    When compared to electric heat pump and solar hot water systems, gas hot water systems generate higher greenhouse gas emissions. This is due to gas being a fossil fuel that is less environmentally friendly. Solar hot water systems significantly reduce carbon emissions by harnessing renewable solar energy, positioning them as one of the most environmentally friendly options.

    Electric hot water systems, especially when powered by renewable energy sources like solar panels, also present significant environmental benefits. However, the source of energy for heating water is critical, with natural gas typically involving lower operational costs compared to electricity, compounding its popularity despite environmental concerns. It’s important to consider energy consumption when choosing between these hot water systems.

    Enhancing Efficiency with Solar Compatibility

    One way to enhance the energy efficiency of gas hot water systems is by combining them with a solar hot water system. Models like the Rinnai B26 and Rheem Hiline range are solar-compatible, providing the benefits of both gas and solar energy.

    Adopting solar water heating systems can lead to substantial environmental benefits, such as preventing thousands of pounds of carbon dioxide emissions each year. However, their efficiency can be affected by factors such as climate, weather conditions, and the availability of sunlight.

    Cost Considerations for Gas Hot Water Systems

    The decision to invest in a gas hot water system should also consider cost implications. These include:

    • Upfront costs

    • Installation expenses

    • Running costs

    • Potential savings

    By 2030, gas hot water systems are expected to become the most expensive option due to market factors affecting gas prices.

    A clear understanding of gas storage hot water system prices the upfront costs, installation expenses, running costs, and potential savings is vital to choosing a system that aligns with your budget.

    Upfront Costs and Installation Expenses

    The upfront costs for gas hot water systems vary depending on the type and capacity. For instance, the price of a gas hot water heater with a storage tank starts at $880 for a 135L capacity and can go up to $1525 for larger capacities such as 360L.

    Installation costs for a new gas hot water system can range from $350 to $1600. If you’re switching from an electric to a gas system or installing a system in a new location, additional costs can range from $1050 to $2550, depending on the installation complexities.

    Running Costs and Potential Savings

    The running costs for gas hot water systems depend on the type of system and the tariff applied. Here are the annual costs for different types of systems:

    • LPG storage systems: $515 to $610

    • LPG instant systems: $405 to $455

    • Natural gas hot water systems with storage: $340 to $400

    • Instant natural gas systems: $280 to $310

    Potential savings can be achieved by choosing energy-efficient models and systems that are compatible with solar heating. For instance, gas-boosted solar hot water systems have the lowest operating costs among gas water heaters and typically cost between $4950 to $6550.


    To wrap up, understanding and choosing the right gas hot water system for your home can lead to improved comfort, savings on energy costs, and reduced environmental impact. Whether you opt for a storage or instantaneous model, a product from Rinnai, Bosch, or Rheem, and whether you invest in a standalone system or one combined with solar heating, the key is to choose a system that best suits your household’s needs and budget.

    Frequently Asked Questions

    What are the disadvantages of a gas hot water system?

    The main disadvantages of a gas storage hot water system include higher upfront costs, increased operating expenses, and the need for proper ventilation. Overall, these factors can make them a less cost-effective option.

    Is it cheaper to heat water with gas or electric?

    In general, it is more cost-effective to heat water with gas as it tends to be cheaper than using electricity, resulting in lower running costs and smaller bills. However, it's important to consider the possibility of running out of gas if using a bottle.

    Is gas hot water worth it?

    Yes, gas hot water systems are worth it as they are more energy efficient and heat water faster compared to electric models. This results in lower energy costs in the long term.

    What is the difference between a storage and an instantaneous gas hot water system?

    The main difference between a storage and instantaneous gas hot water system is that the storage system heats water in a tank for later use, whereas the instantaneous system heats water on demand, making it more energy-efficient. This makes the instantaneous system more suitable for smaller households.

    What factors should I consider when choosing a gas hot water system?

    Consider your household size, hot water usage, available space, budget, energy efficiency ratings, and environmental impact when choosing a gas hot water system. Taking these factors into account will help you make an informed decision.

    Running Costs for A Gas Storage Water Heater

    Brands and Types of Gas Storage Hot Water Systems Available

    We have all the best brands available with over 95% of our storage gas range available for same day installation including the bulletproof Rheem 4-Star range and the standard for Star storage the Steller 330. In our line up we also stock the best from Vulcan, Rinnai, Everhot, Dux and Thermann with the majority available in natural gas and LPG hot water system options. With massive range of systems available for same day install we will be sure to find the most suitable energy saving solution for your family.

    The Efficiency of A Gas Storage Water Heater

    No one like rising gas energy prices and just like electricity LPG and Natural Gas prices are sneaking up faster and faster. With you back pocket being hit hard its a good idea to make sure you select an appropriate sized system to suit your needs.

    Not much has changed in the last few decades regarding the efficiency of gas hot water systems with most manufacturers sticking to the same blueprint across their ranges. With 4-Star being the minimum and standard for the majority of systems there are an increasing number of 5-star energy efficient units coming onto the market. The benefit of the extra star is in running costs with the average family saving around 10% in gas compared to a 4-star unit. The 5 star system does this by running the flue gas up through the middle of the unit then back down to loose as much heater as possible before existing the system.

    Rebates for Gas Storage Hot Water Units

    Currently in Queensland there are no rebates for a gas installation. Check with your supplier for promotions regarding new connections when switching to natural gas.

    Warranties Available With Your Storage Gas Hot Water Systems

    How To FindThe Right Gas Storage Hot Water System

    With minimal differences in performance especially across the 4-Star range, no additonal features and standardised thermostats there is not much to seperate the range. Longevity has always been a strong point across all the main contenders excluding Rinnai which has recently released two systems. The majority of systems we replaced regardless of brand are over twenty years old with the exception of the Rheem Stellar 330 which is generally closer to 15.

    When purchasing new gas hot water systems we would recommend focusing first on efficiency and especially any 5-Star systems and then basing your purchase on warranty as just becuase the units used to last 20+ years, we are sure the manufacturers would prefer that number dropped.

    Important note is that while you may see a number of 5-Star units for sale they are not an option in a LPG hot water system due to the way the gas sinks in the burner chamber.

    Is There a Better Option

    Long term if you are wanting to stick with gas the higher rated energy efficiency the better off you will be. For those wishing to dramatically reduce the carbon footprint and hit to the back pocket a heat pump or solar hot water system is a great option. With a very similar plumbing arrangement only the additon of a new power circuit would be required to get rid of that gas bill for good.

    Life Span of A Storage Gas Hot Water System

    There isnt a genre of systems that have such consistancy scross brands for longevity. We replace the majority of systems close to 20 years out and we would hope to get atleast 15years with any new system regardless of warranty.

    Gas Hot Water Systems and 5 Reasons To Buy

    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.

    Gas Storage Hot WaterSystem Prices and Budget for Installation

    How Gas Storage Hot Water Systems Work

    A storage gas hot water system is a common and reliable way to heat water for residential and commercial use. It operates by storing hot water in a tank and heating it using a gas burner, providing a continuous supply of hot water for use in the household.

    The system consists of several components, including a gas burner, heat exchanger, water tank, thermostat, and pressure relief valve. The gas burner is typically fueled by natural gas or propane and heats up the heat exchanger. As water flows through the heat exchanger, it is heated by the heat exchange process and stored in the water tank for use.

    The thermostat monitors the temperature of the water in the tank and activates the gas burner when the temperature drops below the desired level. Once the water is heated to the desired temperature, the thermostat switches off the gas burner to prevent overheating.

    The pressure relief valve is another important component of the system. It regulates the pressure inside the water tank and releases excess pressure to prevent the tank from bursting. This ensures that the system operates safely and reliably.

    One of the main advantages of a storage gas hot water system is its reliability. These systems provide a continuous supply of hot water and are not affected by fluctuations in gas supply or other external factors. They are also easy to install and require minimal maintenance, making them a cost-effective investment over the long term.

    Another advantage of a storage gas hot water system is its flexibility. These systems are capable of storing large amounts of hot water, ensuring that there is always hot water available when needed. They also provide hot water at a consistent temperature, which is important for applications such as showers and baths.

    In addition to their reliability and flexibility, storage gas hot water systems offer several other advantages. They are easy to operate and require minimal user intervention, making them a convenient solution for hot water. They also operate quietly and produce less noise compared to other water heating systems.

    However, storage gas hot water systems do have some limitations. They are less energy efficient compared to other water heating systems, as they require energy to maintain the temperature of the water in the tank. They also have a larger footprint and take up more space compared to other systems, which may be a limiting factor for some homes or buildings.


    We would recommend when selecting a gas system to work off a tank capacity of 25L per person per day. While a standard system is only 135L they have a high reheat and recovery rate with most systems capable of reheating 200l/h.

    A gas storage system with a family of four cost on average $1700pa when connected to LPG and $850pa for Natural Gas.

    We would expect a well maintained, quality system to exceed 15 years of service.

    You can expect to pay anywhere from $1650-$2200 for a 4-Star system and $2000-$2400 for a 5-Star system depending on brand and size

    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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