Gas Storage Hot Water Installations, Replacement & Servicing

High-Performance Gas Storage Hot Water Systems for Homes Across Melbourne

Fully Insured, Fully Licensed, Competitive Pricing

Professional Installation • System Replacement • Repairs & Servicing

Gas storage hot water systems provide reliable, mains-pressure hot water for residential homes, delivering consistent performance for showers, kitchens, and laundry use. Modern systems like Rinnai Hotflo Gas Storage Tanks combine efficiency, durability, and safety to meet the demands of everyday household hot water.

At Coop Group, we specialise in the installation, replacement and servicing of Rinnai gas storage hot water systems for homes across Melbourne and surrounding suburbs including Bayswater, Croydon, Ringwood, Dandenong, Doncaster, Blackburn, Lilydale, Kilsyth, Frankston, and the Yarra Valley.

Whether you are replacing an ageing gas storage system or installing a new unit, Rinnai’s Hotflo systems provide high performance hot water with optimised gas usage, ensuring energy efficiency without compromising on comfort or reliability.

Our licensed technicians provide expert advice, system selection, installation and maintenance to ensure your gas storage system operates efficiently for years to come.

What Is a Gas Storage Hot Water System?

A gas storage hot water system heats and stores water in a tank, ready for use whenever needed. Unlike continuous flow systems, storage tanks allow multiple taps to run simultaneously while maintaining hot water pressure.

Rinnai Hotflo Gas Storage Tanks use either natural gas or LP gas, with storage capacities of 135 or 170 litres. Their mains-pressure design ensures hot water is delivered to multiple outlets at once, making them ideal for families or busy households.

Benefits of Rinnai Gas Storage Hot Water Systems

Rinnai gas storage systems offer a range of advantages for homeowners upgrading or replacing their hot water system:

Reliable Mains Pressure Hot Water
Hotflo systems deliver consistent hot water to multiple taps simultaneously, perfect for homes with high-demand periods.

Optimised Gas Consumption
Rinnai tanks are designed for energy efficiency, reducing gas usage while maintaining hot water performance.

Durable Construction
Vitreous enamel-lined steel tanks provide long-lasting corrosion resistance, with an 8-year cylinder warranty for peace of mind.

Flexible Capacity Options
Available in 135L or 170L capacities, Rinnai Hotflo systems are suitable for households of up to 5–6 people, depending on climate.

Easy Replacement & Installation
Designed as a direct replacement for existing gas storage systems, installation is straightforward and minimally disruptive.

Gas Storage Hot Water Installation

Installing a Rinnai gas storage system requires correct placement, gas and electrical connections, and tank sizing to ensure optimal performance.

Our licensed technicians assess several factors before recommending the right system, including:

✔ household size and hot water usage
✔ available installation space
✔ gas type (natural or LP)
✔ water pressure and flow requirements
✔ system capacity

Every installation includes:

• removal of your existing hot water system
• full compliance and safety checks
• connection to mains water and gas supply
• system pressure and temperature testing
• professional installation by licensed technicians
• manufacturer warranty support

Our goal is to ensure your new system delivers reliable hot water with efficient, long-term performance.

Gas Storage Hot Water Replacement

If your existing gas storage system is ageing or struggling to keep up with household demand, upgrading to a Rinnai Hotflo system can improve performance and reduce energy usage.

Common signs your system may need replacement include:

• inconsistent water temperature
• hot water running out quickly
• rust or corrosion on the tank
• leaks or faulty valves
• systems over 10–12 years old

Replacing an older system with a Rinnai Hotflo tank ensures high mains-pressure hot water, energy efficiency, and reliable operation for years to come.

Gas Storage Hot Water Repairs & Servicing

Even with durable construction, gas storage systems occasionally require servicing or repairs.

Our technicians can diagnose and repair common issues, including:

• temperature inconsistencies
• gas burner problems
• pilot light or ignition faults
• tank leaks or corrosion
• pressure relief valve issues
• control or thermostat faults

Regular servicing ensures your Rinnai system maintains peak efficiency and reliable operation year-round.

Rinnai Gas Storage Hot Water Systems

Coop Group proudly installs Rinnai Hotflo Gas Storage Tanks, renowned across Australia for their reliability, energy efficiency, and high-performance hot water delivery.

Rinnai’s Hotflo Gas Storage technology provides mains-pressure hot water to multiple taps at once while optimising gas consumption, making it an ideal solution for modern homes seeking consistent and efficient hot water.

These systems are designed to deliver long-term performance, robust construction, and reliable operation, making them an excellent choice for households upgrading or replacing older gas storage systems.

Rinnai Hotflo Gas Storage Technology

Rinnai Hotflo systems use advanced gas-fired heating technology to heat water efficiently within a storage tank. The system maintains consistent water temperature and pressure while supplying multiple taps simultaneously, ensuring household comfort.

The tanks are constructed from vitreous enamel-lined steel, offering superior corrosion resistance and durability. Available in 135L or 170L capacities, the systems are suitable for households of up to 5–6 people, depending on climate.

This design allows Rinnai Hotflo tanks to deliver a high first-hour hot water capacity—up to 257 litres for the 170L model—ensuring homes have access to reliable hot water even during peak usage periods.

Exceptional Energy Efficiency

Rinnai Hotflo Gas Storage systems are engineered to optimise gas usage without compromising hot water performance. By using energy efficiently, these systems reduce running costs and minimise environmental impact compared to older gas storage models.

Smart design features, including well-insulated tanks and precision gas burners, allow the systems to maintain hot water temperature while consuming less gas. This ensures homeowners enjoy reliable mains-pressure hot water while lowering energy bills.

Reliable Performance for Busy Households

Rinnai Hotflo tanks are ideal for homes with high hot water demand. The mains-pressure design allows multiple showers, taps, and appliances to operate simultaneously without noticeable loss of pressure or temperature.

The systems are designed for year-round performance and are capable of maintaining hot water supply even during colder months, making them suitable for the varied climate across Melbourne and surrounding areas.

Flexible System Sizes for Different Homes

Rinnai Hotflo Gas Storage Tanks are available in multiple capacities to suit different household needs:

• 135L Medium Capacity (GHF4135N / GHF4135L) – Ideal for up to 5 people, first hour delivery: 209 litres
• 170L Large Capacity (GHF4170N / GHF4170L) – Ideal for up to 6 people, first hour delivery: 257 litres

These options allow installers to select the correct system size based on household size, hot water usage, and property requirements.

Space-Saving & Smart Design

Rinnai storage tanks are designed for efficient installation and minimal indoor space usage. Key features include:

• compact, easy-to-fit design for direct replacement of existing tanks
• simplified plumbing and gas connections for faster installation
• durable enamel lining for long-term corrosion protection
• easy access to components for servicing and maintenance

This ensures homeowners receive a clean, reliable, and efficient installation with minimal disruption.

Easy Installation & Maintenance

Rinnai Hotflo systems are designed to provide long-term reliability with straightforward servicing. Regular maintenance, such as inspecting valves, burners, and water connections, ensures the system continues to operate efficiently.

Coop Group technicians provide expert installation and ongoing servicing, including:

• tank inspection and pressure testing
• gas and water connection compliance
• thermostat and temperature checks
• manufacturer warranty support

This professional approach maximises system longevity and hot water performance for years to come.

Upgrade to a Reliable Gas Storage Hot Water System

If you are considering upgrading or replacing your existing hot water system, a Rinnai Hotflo Gas Storage Tank offers the perfect balance of efficiency, durability, and high-performance technology.

Coop Group provides professional Rinnai gas storage hot water installation, replacement, and servicing across Melbourne, helping homeowners transition to modern, energy-efficient hot water solutions.

Our licensed technicians can assess your current setup and recommend the most suitable Rinnai system for your household needs.

Contact Coop Group today to discuss installing a modern, high-performance Rinnai Gas Storage Hot Water system for your home.

This is an image of a Rinnai Gas Storage Hot Water System on the Coop Group website who service Bayswater, Dandenong, Croydon, Melbourne

      EXCELLENT  
   Based on 202 reviews 
    
 
 
 
   
 
 
       Posted on Google  
   
   Colleen Waldron 
 
 
 
 Trustindex verifies that the original source of the review is Google. The boys did a great installing our air con they were friendly id be happy to call them out to do a service in the future
  
 
      Posted on Google  
   
   Clare Morse 
 
 
 
 Trustindex verifies that the original source of the review is Google. Right from the first contact, prompt communication, excellent service, turned up on time, I have already recommended to friends And talked about how smooth the whole process was. Thanks Coop Group Clare and Joe
  
 
      Posted on Google  
   
   Carly Salmon 
 
 
 
 Trustindex verifies that the original source of the review is Google. I read the recommendations of the other google reviews and they were right, these guys are great! I had an issue with my gas ducted heating and was able to promptly book in with Coop Heating and Air conditioning to have the unit serviced. They communicated well and text ahead of arrival. Bruno attended and he was fantastic, very knowledgeable, polite and helpful. He sorted out the issue quickly and gave good advice about the unit. Good company, good service, would recommend.
  
 
      Posted on Google  
   
   Stephen Griffiths 
 
 
 
 Trustindex verifies that the original source of the review is Google. Prompt efficient service comprising quote, and installation of new gas unit within two days. Reasonably priced unit and installation team were great. A good company to deal with.
  
 
      Posted on Google  
   
   Brad Auj 
 
 
 
 Trustindex verifies that the original source of the review is Google. Could not have been happier with the Coopair team from Tayla at admin to Bruno and team in the field. Very efficient and excellent at explaining things. Excellent touch with the full detailed report at the end!
  
 
      Posted on Google  
   
   Faro Hazrat 
 
 
 
 Trustindex verifies that the original source of the review is Google. Amazing work, very polite and professional
  
 
      Posted on Google  
   
   Prithiva Singham 
 
 
 
 Trustindex verifies that the original source of the review is Google. Really appreciated that the same service person (Bruno) attended as the last time, hence he knew exactly what to do and where everything was in our home. Great service.
  
 
      Posted on Google  
   
   Tina Whitehead 
 
 
 
 Trustindex verifies that the original source of the review is Google. Thank you for the super fast response and installation Great service
  
 
      Posted on Google  
   
   Sarah Burgin 
 
 
 
 Trustindex verifies that the original source of the review is Google. We had the pleasure of Angus attending our premises to install a new split system. He worked on his own and did so very well. An engaging young man who is a hard worker. Definitely 5 stars to him
  
 
      Posted on Google  
   
   ElBeesVideos 
 
 
 
 Trustindex verifies that the original source of the review is Google. These guys are fantastic! Fast, efficient, tidy, polite & on time! Have actually just contacted them since the job we had completed earlier in the year to get some of our older split systems replaced. Highly recommend!