Rinnai Infinity B26 Gas Continuous Flow Hot Water System
SunCity Hot Water supplies, installs, services and repairs the Rinnai Infinity B26 Gas Continuous Flow Hot Water System across the Sunshine Coast, Brisbane, Bribie Island and Gympie — endless, 6-star efficient hot water on demand. Call 1300 728 122.
Available sizes
The Rinnai Infinity B Continuous Flow Range
Rinnai revolutionised Australian hot water with the first electronically controlled gas continuous flow system — and the Infinity B carries that legacy. It delivers steady, temperature-controlled hot water on demand, engineered to withstand tough Australian conditions and never run out.
The Infinity B26 is the largest of the Builders range, supplying up to 1–3 shower outlets (ideal for 2–3 bathrooms). With 6-star efficiency, Puretemp™ temperature stability, a slimline case and Japanese design, it's a reliable, cost-effective choice — smaller B12, B16 and B20 models are also available.
SunCity Hot Water supplies, installs, services and repairs the Rinnai Infinity B across South-East Queensland. Call 1300 728 122 and we'll help you choose the right size.
Why the Rinnai Infinity B?
Endless, efficient gas hot water, built tough and backed by a market-leading warranty.
Endless Hot Water
Continuous flow heats water on demand — never run out, no matter how many showers are running.
6-Star Efficiency
Superior 6-star gas efficiency for lower ongoing running costs, with no standby tank losses.
Puretemp™ Stability
Puretemp™ temperature-stability control delivers quick flow and precise, steady outlet temperatures.
Safety (50°C models)
50°C-compliant models are adjustable to a true 50°C at the point of use, with electronic safety monitoring.
Tough & Anti-Frost
Built for tough Australian conditions with improved corrosion resistance and anti-frost protection to -20°C.
Japanese Quality
Market-leading quality with Japanese-designed components in a slimline case, plus a built-in status monitor.
Choose the Right Infinity B for Your Home
The Infinity B comes in four sizes — the number is the litres per minute at a 25°C temperature rise. Bigger models run more showers at once.
Infinity B12
- Flow rate
- 12 L/min
- Suits
- 1 shower outlet
Ideal for a small household or single-bathroom home.
Call 1300 728 122Infinity B16
- Flow rate
- 16 L/min
- Suits
- 1 shower outlet
A little more capacity for a single-bathroom home.
Call 1300 728 122Infinity B20
- Flow rate
- 20 L/min
- Suits
- 1–2 shower outlets
Suits most homes with one to two bathrooms.
Call 1300 728 122Infinity B26
- Flow rate
- 26 L/min
- Suits
- 1–3 shower outlets
The largest Builders model — great for 2–3 bathrooms.
Call 1300 728 122Sizing guide (warm climate) — assumes AAA / 3-star outlets. Cool climate and higher-flow fixtures may need a larger model. We'll confirm the right size for your home.
Technical Specifications
Full specifications for the Rinnai Infinity B 12L, 16L, 20L & 26L range.
| Specification | Infinity B12 | Infinity B16 | Infinity B20 | Infinity B26 |
|---|---|---|---|---|
| Flow rate (25°C rise) | 12 L/min | 16 L/min | 20 L/min | 26 L/min |
| Flow rate (20°C rise) | 15 L/min | 20 L/min | 24 L/min | 26 L/min |
| Star rating | 6.2 | 6.1 | 6.0 | 6.0 |
| Factory pre-set temps | 50 / 60 °C | 50 / 60 °C | 50 / 60 °C | 50 / 60 °C |
| Min. operating flow | 1.5 L/min | 1.5 L/min | 1.5 L/min | 1.5 L/min |
| Min. water pressure | 120 kPa | 120 kPa | 160 kPa | 200 kPa |
| Max. gas rate (NG/LPG) | 92 MJ/h | 124 MJ/h | 156 MJ/h | 199 MJ/h |
| Dimensions (H×W×D) | 531×351×202 mm | 531×351×202 mm | 531×351×202 mm | 531×351×202 mm |
| Connections (H/C/Gas) | 15/15/20 mm | 15/15/20 mm | 20/20/20 mm | 20/20/20 mm |
| Weight | 13 kg | 13 kg | 14 kg | 15 kg |
| Approvals | WaterMark / AS3498 | WaterMark / AS3498 | WaterMark / AS3498 | WaterMark / AS3498 |
Specifications from the Rinnai Infinity B brochure. 50°C-compliant models adjust to a true 50°C at the tap; 60°C-plus installs require a tempering valve per AS3500.4. Data may change without notice.
Rinnai Infinity B Brochure
Full features, specifications & warranty (PDF).
Market-leading warranty
Built to Last, Backed for Longer
The Infinity B comes with a 12-year heat exchanger warranty and 3 years parts & labour — with the option to extend the heat exchanger to a total of 25 years. Every install is backed by our own quality workmanship guarantee.
Exchanger*
& Labour
*Extendable by a further 13 years (25 years total) on the heat exchanger, subject to Rinnai's terms and conditions.
Comparing options? See all instant hot water systems, our full gas hot water systems, or the Rinnai brand page.
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SunCity Hot Water supplies and installs all types of hot water systems, including electric hot water systems, gas hot water systems, solar hot water systems and heat pump hot water systems. Call 1300 728 122 for same-day service.
Our local technicians are part of the SunCity Brisbane hot water systems and Sunshine Coast hot water systems service network — available for same-day hot water system repairs and replacement across South East Queensland. Call 1300 728 122 for same-day service.
FAQs
Rinnai Infinity B — Frequently Asked Questions
What is the Rinnai Infinity B?
The Rinnai Infinity B is a gas continuous flow (instantaneous) hot water system. It heats water on demand as it flows through the unit — no storage tank — so you get endless hot water and never run out, with precise electronic temperature control.
What sizes does the Rinnai Infinity B come in?
The Infinity B Builders range comes in 12L, 16L, 20L and 26L models. The number refers to litres per minute at a 25°C temperature rise — the B26 delivers up to 26 L/min, ideal for larger households.
What size Rinnai Infinity B do I need?
As a guide in a warm climate: B12 and B16 suit 1 shower outlet, B20 suits 1–2, and the B26 suits 1–3 shower outlets (great for 2–3 bathrooms). We'll size the right model for your household and gas supply.
Does the Rinnai Infinity B run on natural gas or LPG?
Both. The Infinity B is available in natural gas and LPG (propane) models, with a range of Rinnai temperature controllers available for the kitchen and bathrooms.
Does the Rinnai Infinity B need a tempering valve?
50°C-compliant models can be adjusted to a true 50°C at the point of use. The unit is adjustable up to 53°C; for 60°C-plus installations a tempering valve is required in accordance with AS3500.4. We'll confirm what your install needs.
What warranty does the Rinnai Infinity B have?
The Infinity B comes with a 12-year heat exchanger warranty and 3 years parts and labour as standard, with the option to extend the heat exchanger warranty by a further 13 years (25 years total), subject to Rinnai's terms — plus our own workmanship guarantee on installation.
Do you install and repair the Rinnai Infinity B?
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