Ultimate Instant Gas Hot Water Systems Buying Guide

Instant gas hot water systems are also known as “continuous flow” hot water systems. Unlike storage gas hot water systems, they do not have a tank to store hot water. Instead, they heat water as it flows through the system, so you have a constant supply of hot water.

Size: Instant gas hot water systems are much smaller than gas storage hot water systems, as they do not have a tank. They can be installed inside or outside of your home, and can easily be concealed behind cabinets or walls.

Cost: The cost of a instant gas hot water systems will depend on the brand you choose, as well as the size of the unit. On average, a gas continuous flow hot water system can cost between $1,000 and $3,000, plus installation costs.

Efficiency: Gas continuous flow hot water systems are more efficient than gas storage hot water systems, as they only use energy to heat the water you need at the time. This means that they are a more cost-effective option for households that use a large amount of hot water.

Advantages of Instant Gas Hot Water Systems

  • Energy Efficient: Continuous flow hot water systems are very energy efficient as they only heat the water that is being used, reducing energy waste.
  • Endless Supply of Hot Water: Continuous flow hot water systems provide an endless supply of hot water, making them ideal for large households.
  • Space Saving: These systems are compact in size and do not require a bulky storage tank, freeing up valuable space in your home.

Disadvantages of Instant Gas Hot water Systems

  • Cost: Continuous flow hot water systems are more expensive to purchase and install compared to gas storage hot water systems.
  • Installation: Installation of a continuous flow hot water system can be complex and requires a professional plumber.
  • Water Pressure: Instant Gas hot water systems rely on consistent water pressure, so if you have low water pressure, this system may not be suitable.

Product of the Month

Rinnai B26 Gas Hot Water System $1149 Installed

Rinnai B26 Gas Hot Water System $1149 Installed

Regular price $1,549.00 Sale price $1,149.00 Save $400

Rinnai B26 Review: An In-Depth Look at Efficient Continuous Flow Hot Water Performance

Are you exploring the Rinnai B26’s capabilities for your home’s hot water needs? This review cuts through the clutter to give you a straightforward analysis of its energy efficiency, design, and performance. Learn about what sets the B26 apart in the competitive landscape of natural gas hot water systems.

Key Takeaways

  • The Rinnai B26 stands out for its Japanese design emphasizing durability, energy efficiency with a 6.1-star rating, and ability to reduce greenhouse gas emissions.

  • Despite its compact dimensions, the Rinnai B26 delivers robust performance with a rate of 26L/min of hot water and offers optional temperature controllers for precise temperature settings.

  • The unit is compatible with solar systems for a more sustainable energy solution, requires professional installation and regular servicing, and is a cost-effective, efficient alternative to electric hot water systems.

The Rinnai B26 Advantage: Quality Japanese Design and Manufacturing

Demonstrating the best of Japanese design and manufacturing, the Rinnai B26 is a reliable, quality unit built to last. Beyond its attractive aesthetics and durability, this unit also contributes to environmental sustainability. The Rinnai B26 is designed to reduce greenhouse gas emissions substantially, fostering a greener environment for us all.

The B26 natural gas model is a testament to Rinnai’s commitment to energy efficiency, providing hot water on demand while keeping running costs low. This continuous flow hot water system is designed to heat water only when needed, effectively reducing energy consumption and associated costs.

The Rinnai B26, along with its sibling the Rinnai Infinity 26, outshines competitors like Rheem with its superior features. The superior quality Japanese design and manufacturing guarantee a unit that’s built to last, delivering endless hot water, year after year.

Energy Efficiency: The 6.1 Star Energy Rating

The Rinnai B26 is a hot water system that combines superior performance with impressive energy efficiency, boasting a 6.1-star energy rating. This rating, determined by factors such as energy supplied and heating type, is a testament to the unit’s comprehensive performance in energy conservation.

For homeowners, the high energy rating of the Rinnai B26 means reduced energy consumption, long-term savings, and a decrease in greenhouse gas emissions. It’s a win-win scenario for your wallet and the environment.

Outperforming many other hot water systems, especially electric ones, the Rinnai B26 natural gas hot water system stands out. Thanks to its low emission burners, Puretemp™ temperature control technology, and other efficient components, it offers a cost-effective option for homeowners seeking to lower their energy expenses without compromising on performance.

Compact Size, Big Performance

Despite its compact size, the Rinnai B26 is a powerhouse in performance. With dimensions of 571mm in height (including brackets), 350mm in width, and 194mm in depth, the Rinnai B26 stands apart from many other hot water systems in terms of size. Its compact design also makes it easier to install temperature controller cables.

The compact size of the Rinnai B26 allows for versatile installation options. It’s a perfect fit for properties with limited space, and its efficient design ensures optimal performance in heating water. So, whether you’re a city dweller with limited room or a suburban homeowner looking for a space-saving solution, the Rinnai B26 has you covered.

Despite its compact size, the Rinnai B26 doesn’t compromise on performance. Capable of producing hot water at a rate of 26L/min, it meets your hot water requirements by only heating water when needed. So, you can enjoy a hot shower whenever you want without worrying about running out of hot water.

Precise Temperature Control with Optional Controllers

Optional temperature controllers, compatible with the Rinnai B26, enable you to dictate the hot water temperature according to your preference. You can add up to 4 optional temperature controllers to your unit for enhanced control.

These additional controllers empower users to maintain precise control over the temperature. When utilized appropriately, the hot water unit will effectively provide the selected temperature. So, whether you prefer a hot shower or a warm bath, the Rinnai B26 has you covered.

The Rinnai B26 offers precise temperature control and can be enhanced with optional controllers to achieve even more accurate temperature adjustments. According to user experiences shared on a forum, there appear to be no specific drawbacks associated with using optional controllers with the highly energy efficient Rinnai B26.

Heat Exchanger: The Core of B26 Continuous Flow Hot Water System

The heat exchanger forms the core of the Rinnai B26 continuous flow hot water system. This component facilitates the efficient transfer of heat between the burning gas and the water while ensuring they remain separate and do not mix. It’s a key component in ensuring the B26’s efficient performance, making it suitable for domestic applications.

The heat exchanger in the Rinnai B26 has been noted to exhibit significant rust and corrosion-type chalky white powder. At first glance, this might raise concerns about the condition of the heat exchanger. However, the National Field Support Specialist has confirmed that the surface rust on the heat exchanger is within normal parameters and does not result in leaks or impact the heat exchanger’s operational capability. So, you can continue to enjoy hot water from your Rinnai B26 with peace of mind.

Reducing Running Costs with Natural Gas

One of the standout features of the Rinnai B26 is its ability to reduce running costs and environmental impact through its use of natural gas. Natural gas is a highly efficient fuel source that allows the unit to provide continuous flow hot water with minimal energy wastage.

The Rinnai B26 has the following features:

  • Competitive gas consumption rate of 199 MJ/hr

  • Cost-effective option among continuous flow water heaters

  • Provides hot water whenever you need it without worrying about high energy costs.

In essence, the Rinnai B26 offers the best of both worlds - performance and efficiency. It’s an investment that pays for itself in the long run, through reduced running costs and minimal environmental impact.

Installation and Service: What to Expect

A licensed professional should install the Rinnai B26, adhering to the manufacturer’s guidelines and current AS/NZS standards. It’s important to ensure that the installation is carried out safely and correctly to ensure the unit’s optimal performance.

During installation, the Kitchen Water Controller:

  • The temperature should not exceed 50°C

  • The manufacturer’s installation and maintenance guidelines must be followed

  • Professional help should be sought if a gas odor is detected

This is why it’s essential to have the unit installed by a licensed professional in the gas and plumbing industry, such as JR Gas & Water.

For optimal performance, schedule a service for your Rinnai B26 at least once every three years. Regular servicing helps to ensure that your unit continues to provide hot water efficiently and reliably.

Solar Compatibility: Future-Proof Your Hot Water Needs

The Rinnai B26 is a forward-thinking model, compatible with solar systems, acting as a gas booster in Rinnai solar hot water systems. This means you have the option to integrate it with a solar system to future-proof your hot water needs.

Integrating the Rinnai B26 with a solar hot water system offers a number of advantages including energy savings, cost savings, and a reduction in carbon footprint. Thus, you can relish hot water while contributing positively to the environment.

To integrate a Rinnai B26 with a solar system, particularly a Rinnai Sunmaster or Rinnai Prestige solar hot water system, it is imperative that the installation is carried out by a competent and licensed professional. This ensures that the system is installed correctly for optimal performance and safety.

Comparing the Rinnai B26 to Other Models

In terms of energy efficiency, the Rinnai B26 stands out when contrasted with other hot water systems. Boasting a 5.9 star energy rating, the B26 is a highly efficient gas hot water system that outperforms many electric hot water heaters.

Regarding cost-effectiveness and performance, the Rinnai B26 competes strongly with other models within its price bracket. It offers a cost-effective solution for homeowners while maintaining high performance and quality standards.

The Rinnai B26 has unique characteristics and warranty specifics when compared to other Rinnai models. It features a distinct color and does not include a display window. Its warranty for the heat exchanger is slightly shorter than the Infinity 26. However, both models share the same energy rating, internal components, and hot water output capacity.


In a nutshell, the Rinnai B26 is a compact, energy-efficient hot water system that offers quality Japanese design and manufacturing, precise temperature control, compatibility with solar systems, and reduced running costs. It’s a unit that delivers big on performance, helping you meet your hot water needs now and in the future. The Rinnai B26 is more than just a hot water system – it’s a cost-effective, environmentally friendly solution for your home.

Frequently Asked Questions

How much does it cost to install a Rinnai B26?

The cost to install a Rinnai B26 is approximately $1299 when fully installed by JR Gas & Water.

Does Rinnai B26 have a pilot light?

No, the Rinnai B26 does not have a pilot light. It uses electric ignition and a sensor switch for automatic firing when cold water passes through the heater.

What is the energy rating of the Rinnai B26?

The energy rating of the Rinnai B26 is 6.1 stars, indicating its energy efficiency.

Is the Rinnai B26 compatible with solar systems?

No, the Rinnai B26 cannoy be integrated with solar systems as a gas booster, for this you will require the S20

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What To Look For When Comparing Brands of Instant Gas Hot Water Systems

Efficiency: Look for systems with a high energy efficiency rating, as this will determine how much energy is needed to heat the water and how much you will spend on gas bills.

Flow rate: Make sure the system you choose has a flow rate that matches your hot water needs. A system with a low flow rate may not be able to keep up with demand.

Safety features: Consider the safety features included with each system, such as overheat protection, flame failure protection, and pressure relief valves.

Warranty: Look for a system that comes with a long warranty, as this can provide peace of mind and help protect your investment.

Compatibility: Make sure the system you choose is compatible with your existing gas supply and plumbing.

Cost: Instant gas hot water systems can be more expensive than traditional electric hot water systems, but the cost of gas is typically lower than electricity. Consider the total cost of ownership, including upfront costs, ongoing energy costs, and maintenance costs, when comparing brands.

Reputation: Research the reputation of the brand and read customer reviews to ensure that you are choosing a reliable and high-quality instant gas hot water system.

Noise level: Some instant gas hot water systems can be noisy, so consider choosing a model that is designed to operate quietly.

Size: Consider the size of the unit, as some systems are larger and take up more space than others. Make sure you have enough room for the system you choose.

How Instant Gas Hot Water Systems Work

Instant gas hot water systems work by heating water as it flows through the system, eliminating the need for a storage tank. The system consists of a gas burner, a heat exchanger, and a flow control valve.

When hot water is required, cold water is drawn into the unit and passed through the heat exchanger, which is heated by the gas burner. The hot water is then delivered directly to the tap or fixture, providing an unlimited supply of hot water on demand.

The flow control valve regulates the flow of water through the system, ensuring that the water is heated to the desired temperature. The system may also include a temperature control valve to adjust the temperature of the hot water.

Reviews From Our Customers


Had Gas Hot Water System replaced. After checking their reviews, I called them out. They came out during the 2022 Brisbane Flood. The two tradies were friendly and polite. Got three quotes and JR were the cheapest by a $190 from one and a whopping $496 from another. Extremely happy with service and cost. Have put them on permanent file for any future works. It pays to shop around.


JR Gas and Water were fast, efficient and very reliable. They sent a quote quickly that was itemised and comprehensive. I was able to approve the quote online and they were out the next day to fit the new hot water system. as the family have a very ill family member we were all very grateful. We had tried another service just before this company and they were all over the show with lots of comments about "extras", after providing an initial quote. So glad we changed to JR Gas and Water!


I recently contacted JR Gas & Water as I needed a new electric hot water system suppled and installed. Their website is informative and easy to navigate and the quote and booking process very straight-forward. The service I experienced from my initial phone enquiry with Jay all the way through to the punctual and professional installation by Sean was absolutely amazing! The service provided far exceeded my expectations. I highly recommend JR Gas & Water.


my hot water system blew up overnight, i sent for a quote online in the morning with some pics of what I had . Within minute's i had the quote back on my email. I was lucky enogthey had 1 spot left for it to be fitted the same day😊
The communication & service is next to none no wonder you have 5 stars you deserve them
thank you so very much will definitely be recommending you guys thats for sure


From the first point of contact I was impressed with how JR Gas and water handled my query. The electronic quote was speedy and showed how professional this company is. My hot water system was ready to go the very next day. Thank heaps!


Jarred and his team at JR Gas and Water and Mark at Proficient Electrical are true professionals, obviously proud of their work and jealous of their reputation. Their price is competitive, their work is neat, and they leave the work area clean and tidy at the end of the job. It is too early to comment on the Rheem B26 continuous flow LPG hot water system that Jarred provided and installed, but, based on the work quality, I have faith that it will live up to expectations.


Very fast service. They have fitted a new hot water system in less than 24hours of my enquiry. The new system is faultless and amazing. The website is also very easy to navigate and I really liked the prices shown also. Different payment plans also which a awesome idea. Thank you again for your service and I will be recommending Jr gas an water to anyone in the future.


Fantastic service. Very efficient online communication. Had a quote from an alternate 24hr plumbing company to replace a continuous hot water system for $5,009. JR did the whole job on a Saturday for $1,600. Sean a great respectful efficient tradesman.
Highly recommend.


We recently contacted JR Gas and Water about replacing our solar hot water system. Their quote arrived quickly and once we approved we were booked in within the week to have the job completed. Communication was great and the job was carried out professionally. Highly recommend.


You wont see reviews this good anywhere else.

Only the most reputatble brands.

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Who Are We?

Who Are We?
Here at JR Gas and Water, we offer a comprehensive range of solar, electric and gas hot water systems to suit all your water heating needs. We know what our customers need, and that’s why the entirety of our work is carried out to specifically meet your strict service standards, all at very competitive prices. We strive to go above and beyond to ensure you’re completely satisfied with your experience. All of our systems come with fixed prices in black and white right here, so you can prepay online for convenience or pay when the project is complete and you’re 100% happy.

Our Pricing
At JR Gas and Water, all of our prices are FIXED, meaning that you know exactly what you're getting without any unwanted surprises. This also applies to every one of our services, and we make sure to display those prices in BLACK & WHITE so that you won’t be pressured into a sale. When it comes to our prices, what you see is what you get.

Hot Water Sale & Installation Packages
We offer complete hot water sales and installation packages. That means first we’ll help you find the best hot water system installation for your home or business. We carry all the major brands of hot water systems, so you're sure to find one that meets your needs. From gas to electric to solar hot water heaters, we’ve got you covered. Once you select your next hot water heater, we’ll be there for every step in the installation process.

Hot Water Installation
Installation of a hot water heater is not a DIY project. A poor installation job can lead to water leaks, gas leaks, or electrical shorts, all of which can pose safety hazards for your business or your family. That’s why when you want the job done correctly, leave it to the professional plumbers at JR Gas and Water. Our hot water plumber has years of experience in installing and maintaining hot water systems Brisbane wide, so you’ll know the job will be done right.

JR Gas and Water for HWS Brisbane

If you're looking for hot water heaters, then contact the experts in hot water systems Brisbane trusts – contact JR Gas and Water. We can provide you with the installation, maintenance, and repair services that you need to keep your hot water system running smoothly. We're always here to help, so don't hesitate to reach out to us by call on 0478 521 501 from 7am to 7pm 365 days a year, or by using our online contact form.