Rinnai vs Rheem vs Dux: Which 26L Continuous Flow Hot Water System Is Best?

When it comes to choosing a continuous flow gas hot water system for your home, three brands dominate the conversation: Rinnai, Rheem, and Dux. While all offer 26L/min systems designed for medium to large homes, Rinnai’s Infinity Series consistently stands out for energy efficiency, smart features, and long-term durability.

In this expert breakdown, we compare the Rinnai Infinity 26, Rinnai B26, Rheem Metro 26, and Dux 26 to help you decide which one is best for your household.

🔁 Capacity & Performance: How Do They Stack Up?

All four systems offer 26L per minute of hot water delivery, ideal for homes with 2+ bathrooms or 3–5 occupants. But while capacity is the same, performance varies based on internal tech and heat exchange speed.

💡 Our Verdict:
✔ All units deliver 26L/min, but the Rinnai Infinity 26 wins for faster heat recovery and more stable temperature output, especially during peak use.

🔧 Installation & Retrofit Compatibility

If you’re upgrading from an old gas system, the Rinnai B26 is designed with retrofit compatibility in mind. It fits more existing recess boxes and is easier to install in tight or existing spaces.

💡 Our Verdict:
✔ Rinnai B26 is the easiest to retrofit and install, reducing downtime and installation costs.

🛠 Need help choosing the right model for your home? Get a quote from JR Gas & Water

🛡 Durability & Build Quality

When investing in a new hot water system, longevity matters.

• The Rinnai Infinity 26 uses a stainless steel heat exchanger, built for superior corrosion resistance.

• Rheem Metro 26 and Dux 26 use copper components, which are more prone to corrosion over time.

💡 Our Verdict:
✔ Rinnai Infinity 26 is built to last longer with less maintenance required.

⚡ Energy Efficiency & Running Costs

Rinnai models feature 6-star energy ratings, including the Infinity 26’s Puretemp™ tech, which delivers hot water at precise temps—reducing water waste and saving gas.

💡 Our Verdict:
✔ Rinnai Infinity 26 is the most efficient, offering long-term savings on your energy bills.

📱 Smart Features & User Experience

Both Rheem Metro 26 and Rinnai Infinity 26 support digital controllers, but Rinnai adds more:

• Optional Wi-Fi control modules

• Smart temperature regulation

• App integration and status monitoring

💡 Our Verdict:
✔ Rinnai wins again with future-proof features and superior user control.

🔇 Noise Levels

All models are relatively quiet, but Rinnai Infinity 26 includes advanced sound-dampening for nearly silent operation—especially important for wall-mounted units near bedrooms or living areas.

💡 Our Verdict:
✔ Choose Rinnai Infinity 26 for whisper-quiet performance.

📜 Warranty & Support

Rinnai leads the industry in warranty:

• Infinity 26: 12-year heat exchanger warranty

• Rheem Metro 26: 10 years

• Dux 26: Typically 10 years (depending on the model)

💡 Our Verdict:
✔ Rinnai offers longer coverage and trusted customer service across Australia.

🏆 Final Verdict – Which System Is Right for You?

🚿 Why Rinnai Is the Better Choice

✔ Superior corrosion resistance with stainless steel internals
✔ Energy savings thanks to Puretemp™ and high star rating
✔ Smart, Wi-Fi compatible controls available
✔ Quieter, more reliable operation
✔ Longer warranty and after-sales support you can trust

🔧 Installed by Brisbane’s Hot Water Experts

At JR Gas & Water, we supply and install the full range of Rinnai, Rheem, and Dux continuous flow systems across Brisbane and Gold Coast. Whether you need a same-day replacement or a full upgrade, we’ve got you covered.

🛒 Explore our Gas Continuous Flow Systems

💬 Speak to a licensed hot water expert today

🔍 FAQs

1. Are all 26L systems the same?
No—while they provide the same flow rate, internal build quality, efficiency, and features vary significantly.

2. Do I need a tempering valve?
Yes, for any model delivering above 50°C, per AS/NZS 3500.4.

3. Can I install a Rinnai myself?
No. Installation must be done by a licensed gas plumber and comply with Australian regulations.

4. Will a Rinnai work with solar PV?
Yes, you can install a timer to run off excess solar PV for even more energy savings.

5. What's the difference between Infinity 26 and B26?
The Infinity 26 offers more advanced features, quieter operation, and a stainless steel heat exchanger. The B26 is a more budget-friendly option with copper internals.