Rinnai Infinity B20 Model Number: Infinity B20
$1,479 Supplied & Installed in Perth
High-capacity hot water for growing households
Looking for a reliable, energy-smart hot water solution? The Infinity B20 Gas Continuous Flow Hot Water Heater is perfect for single-bathroom homes and even suitable for two bathrooms in warmer areas.
This continuous flow gas system heats water only as needed, meaning you’ll enjoy the comfort of endless hot water – without the high energy bills. With a superior 6 Star energy rating*, this 20L system offers powerful performance while keeping efficiency front and centre.
Crafted to endure harsh Australian weather conditions, the Infinity B20 combines performance with practicality through features like slim, modern design that fits almost anywhere, user-friendly temperature display for easy adjustments and Puretemp™ stability control for consistent water temperature.**
Covered by Rinnai’s 25 year heat exchanger warranty***, the Infinity B20 is built for longevity and peace of mind.
Take your system to the next level with Rinnai’s optional hot water controllers, giving you extra control and convenience at the push of a button.
Dimensions:
H: 531, W: 351, D: 202
Important Pricing Information
Our listed prices apply to standard, like-for-like replacements of existing hot water systems, assuming the new unit is similar in type and easily accessible.
If your setup requires additional work-such as new pipework or valve upgrades-extra charges may apply. These costs generally range between $85 and $420. Any variations will be clearly explained by our technician before work begins, so you know exactly what to expect.
Please note:
Quoted pricing is based on compliant installations. If your system requires upgrades to meet current plumbing or gas regulations, this may incur additional costs. Again, our team will always discuss these with you upfront.
What’s Included
✔️ Removal and responsible disposal of your old hot water unit
✔️ Plumbing and gas compliance certificates provided
✔️ Honest pricing, no surprises-unlike many online-only providers
✔️ Perth-based customer service you can rely on
✔️ All work done to AS3500 standards
System Type Changeover?
Converting from gas storage to continuous flow? Expect an additional cost of $450–$1550 depending on site specifics.
Features & Performance
- Ideal for 1 bathroom (up to 2 in warmer climates)
- Never runs out of hot water
- Precise temperature control for safety and convenience
- 6.0 Star equivalent energy rating*
- Status operation monitor
- Puretemp™ temperature stability technology**
- LPG or Natural Gas models available
- 25 year extended heat exchanger warranty***
6.0 Star equivalent energy rating*
- Low running costs
- Highly efficient
- Low greenhouse gas emissions
Superior technology
- Quality Japanese design and manufacturing
- Precise temperature control for safety and convenience
- Compact design allows installation flexibility
- Suitable for higher ambient water temperatures
- Compatible with low flow rated shower fixtures
Rinnai quality
- 25 year extended heat exchanger warranty***
- After sales support
Related products/Add-ons
★ Hot Water Controllers
★ Pipe Covers
★ Recess Boxes
★ Security Brackets
★ Smartstart Water Saver system
* Independently calculated using Australian Standard AS5263.1.2. | S5263.1.2 limits the rating shown on the energy label to 6.0 Stars. | Where the calculated rating of Rinnai appliances exceeds 6.0 Stars it is designated as an “equivalent” rating.
** Puretemp™ temperature stability control ensures that the water temperature remains steady, even during fluctuations in flow.
*** 25 year extended heat exchanger warranty available subject to participating in the Rinnai scheduled service program. For full terms and conditions please refer to the warranty booklet.
Specifications
| Rinnai – Infinity B20 Gas (Tankless) Continuous Flow Hot Water System | Unit | Values | ||
| Shower Outlets | Warm Climates | No | 1 – 2 | |
| Cool Climates | 1 | |||
| Dimensions | Height | mm | 531 | |
| Width | 351 | |||
| Depth including Brackets | 202 | |||
| Height including Brackets | 571 | |||
| Hot Water Outlet | From Wall | 87 | ||
| Left from Centre | 105 | |||
| Cold Water Inlet | From Wall | 68 | ||
| From Centre | 10 | |||
| Gas Connection | From Wall | 77 | ||
| From Centre | 83 | |||
| Connection Sizes | Hot | 20 | ||
| Cold | 20 | |||
| Gas | 20 | |||
| Weight | kg | 14 | ||
| Energy Rating | Stars | 6.0 | ||
| Flow Rate | 25°C | L / min | 20 | |
| 20°C | 24 | |||
| Operating Water Flow | Minimum | 1.5 | ||
| Gas Rate | NG | Minimum | mj / h | 20 |
| Maximum | 156 | |||
| LPG | Minimum | 20 | ||
| Maximum | 156 | |||
| Water Pressure | Minimum | kPa | 160 | |
| Maximum | 1000 | |||
| Factory Default Temperature | °C | 50 / 60 | ||
| Electrical Consumption | W | 68 | ||
| Status Monitor | Yes | |||
* Sizing assumes AAA or 3 star outlets. For non WELS rated or WELS rated fixtures with higher flow outlets (AA, A, 2 star or 1 star rated), a larger size appliance or additional appliance may be required to deliver adequate performance. This is a guide only, special site and location factors may affect this. Half a shower outlet refers to a guest shower or powder room that is not used all the time. For more information, consult with your hot water specialist.
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