Rinnai B-Series Continuous Flow Gas Hot Water System Review – Is It the Best Choice?

The Rinnai B-Series Continuous Flow Gas Hot Water System is one of Australia’s most popular options for households seeking reliable, energy-efficient hot water. With decades of proven performance, the B-Series delivers consistent flow, excellent durability, and some of the lowest running costs of any gas hot water system. But is it the right choice for your home? Let’s break down everything you need to know.

🔥 Capacity & Performance

The B-Series comes in 16L, 20L, and 26L capacities, catering to a wide range of home sizes and hot water demands.

Key Features:

• Heavy-duty copper heat exchanger – up to a 15-year warranty.

• Preset 50°C models to meet legal requirements for internal outlets.

• Optional 60°C models for homes with tempering valves.

• Minimal flow rate of just 1.5L/min, preventing annoying cut-outs when you’re handwashing or using a low-flow tap.

💡 Pro Tip: If you’ve had issues with inconsistent temperatures on other brands, the Rinnai B-Series solves that with stable flow even during low demand.

🌿 Energy Efficiency & Running Costs

The Rinnai B-Series is rated up to 6.2 stars, making it one of the most efficient continuous flow gas systems on the market.

Cost-Saving Benefits:
✅ Switching from a 4-star gas storage unit can save $500+ per year on gas bills.
✅ No standby heat loss – water heats only when you turn on the tap.
✅ Lower operating noise compared to older systems.

🔍 Considering Solar?
If you have solar PV, an electric heat pump water heater might offer even bigger long-term savings. But where solar isn’t practical, the B-Series is still among the most economical gas options.

🛠️ Installation & Compatibility

One of the reasons so many Brisbane households choose Rinnai is the simple retrofit installation:

✔ Lightweight unit (~20kg) for easy wall mounting.
✔ Standard pipe connections, compatible with most older systems.
✔ No need for expansion valves, drain lines, or extra bases.

✅ Fast Installation: JR Gas & Water can often install a Rinnai B-Series in under 30 minutes if replacing an existing unit.

💪 Durability & Reliability

Rinnai has earned its reputation for systems that last 15–20+ years.

Durability Features:

• Copper heat exchanger with 15-year warranty.

• Frost protection to –20°C.

• Stainless steel and aluminium components resist corrosion.

• Robust ignition system for dependable starts every time.

💡 Real-World Example: JR Gas & Water regularly replaces B-Series units after 20+ years of service—hard to beat for lifespan.

🔐 Safety & Water Quality

Safety and compliance are built in:

• 50°C preset units meet Australian regulations for safe tap temperatures.

• Optional 60°C models can be installed with tempering valves.

• Superior corrosion resistance keeps your water clean and safe.

⚙️ Smart Features & Accessories

Enhance your system with:

• Digital temperature controllers – perfect for kitchens and bathrooms.

• Bath fill functions – fill your tub automatically to a set level.

• Security brackets, pipe covers, and recess boxes for neat finishes.

💰 Cost & Value

Rinnai B-Series Pricing:

• From $1,199 installed (inc. GST).

• Same-day installation available throughout Brisbane.

Over 10 years, the B-Series typically saves hundreds compared to gas storage heaters—especially as gas prices rise.

🏠 Who Is It Best For?

✅ Ideal For:

• Homes upgrading from gas storage to continuous flow.

• Households needing endless hot water with low running costs.

• Properties in cooler climates that require frost protection.

❌ Not Ideal For:

• Homeowners wanting solar-integrated water heating.

• Those switching to fully electric heat pump systems.

⭐ Final Verdict – Should You Buy It?

Overall Rating: ★★★★☆ (4.7/5)

Pros:
✔ Reliable, consistent hot water.
✔ 6-star efficiency for lower bills.
✔ 15-year heat exchanger warranty.
✔ Fast and simple installation.
✔ Low noise and maintenance.

Cons:
❌ No built-in smart home integration.
❌ Not compatible with solar boosting.

If you want an affordable, high-performance gas continuous flow system, the Rinnai B-Series is an excellent investment—and one of Australia’s most proven options.

👉 Ready to upgrade?
Get a Quote from JR Gas & Water today and enjoy endless hot water with professional installation.