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  1. Home
  2. /Hot Water
  3. /Gas Continuous Flow

Gas Continuous Flow

As Australia’s first fully Electronic Gas Continuous Flow Hot Water System, the Rinnai Infinity / Infinity B delivers an endless supply of hot water on demand, providing reliable, energy-efficient comfort for households of all sizes.

Rinnai Infinity B12 Gas Continuous Flow Hot Water

Infinity B

Ideal for1 bathroom

  • Quality Japanese design and manufacturing
  • Never runs out of hot water
  • Precise temperature control for safety and convenience
  • Status operation monitor
  • Puretemp™ temperature stability technology
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Rinnai B26 Black Gas Continuous Flow Hot Water (lifestyle – wall)

B26 Black

Ideal for2 bathrooms (3 in warmer climates)

  • Reliability of the Builders B26 with a modern black finish
  • Quality Japanese design and manufacturing
  • Never runs out of hot water
  • Precise temperature control for safety and convenience
  • Puretemp™ temperature stability technology
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Infinity

Infinity

Ideal for2-3 bathrooms (4 in warmer climates)

  • 32 Litre capacity
  • Quality Japanese design and manufacturing
  • Never runs out of hot water
  • Precise temperature control for safety and convenience
  • Status operation monitor
View product
Rinnai Infinity 16 Enviro Gas Continuous Flow Hot Water (front)

Infinity Enviro

Ideal for1 bathroom (2 in warmer climates)

  • Quality Japanese design and manufacturing
  • Never runs out of hot water
  • Precise temperature control for safety and convenience
  • Puretemp™ temperature stability technology
  • LPG / Natural Gas models available
View product
Rinnai Infinity 28i Gas Continuous Flow Hot Water (front)

Infinity 28i (Internal)

Ideal for1-2 bathrooms (3 in warmer climates)

  • Quality Japanese design and manufacturing
  • Never runs out of hot water
  • Precise temperature control for safety and convenience
  • Status operation monitor
  • Puretemp™ temperature stability technology
View product
Control your Infinity hot water with the Deluxe controller

Control Infinity Hot Water

  • Suitable for Infinity / Infinity B products
  • Precise temperature control
  • Added safety and piece of mind
  • Automatic bath fill and temperature function (preset your desired litres)
  • Shower saver feature (preset your desired litres)
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Rinnai Flowmaster 10 Gas Instantaneous Hot Water (front)

Flowmaster 10

Ideal for1 bathroom

  • No power outlet required
  • Puretemp™ temperature stability
  • 10 year warranty on heat exchanger
View product
Rinnai Pipe Covers (PC12W)

Infinity Accessories And Flueing

  • For Infinity / B systems
  • Provides a neat and clean finish to the installation
  • Two Pipe Covers can be installed together to hide longer pipe work if required
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Gas Continuous Flow

Industry-leading continuous flow performance and comfort

The Rinnai Infinity / Infinity B Gas Continuous Flow Hot Water System delivers reliable, on-demand hot water through Australia’s pioneering fully electronic continuous flow technology, providing consistent comfort for homes of all sizes.

Dependable performance and energy efficiency

The Rinnai Infinity / Infinity B Gas Continuous Flow Hot Water System delivers continuous hot water on demand through Australia’s pioneering fully electronic continuous flow technology, providing reliable comfort for homes of all sizes. Energy-efficient operation, precise temperature control, compact installation, and proven durability combine to deliver dependable performance and lower running costs every day.

Consistent performance with precise temperature control

  • Reliable temperature consistency

    Reliable comfort every day
  • Consistent pressure, every time

    Comfortable hot water, even during peak demand
  • Dependable everyday performance

    Handles simultaneous household demand

FAQs

Combining proven continuous flow technology with energy-efficient operation, the Rinnai Infinity / Infinity B delivers reliable hot water and lasting comfort for households of all sizes.

Benefits

  • Heats water only when needed, which can improve energy efficiency

  • Provides continuous hot water without the need for a storage tank

  • Compact design that can save space around the home

  • No heat loss from storing hot water in a tank

Considerations

  • Flow rate may be limited if multiple taps or showers are used at the same time

  • Some homes may require the right gas supply, water pressure or electrical connection depending on the model

  • Upfront system and installation costs can vary depending on the setup

Yes, they are the same type of system. A "Tankless" or Continuous Flow hot water unit heats water on demand, rather than storing it in a tank. This means you’ll never run out of hot water, and energy is only used when you turn on the tap – making it an efficient and space-saving option for many homes.

Note: "Tankless" is the term commonly used in the United States.

There are many factors to consider when sizing a hot water system for your home. It’s always best to consult with a Rinnai specialist / registered technican to ensure you make the right decision.

Below is a break down of the Infinity range for sizing comparisons.

Applicable Models

Infinity B12

Infinity B16

Infinity B20

Infinity B26

Infinity 28i

Infinity 32

No. of shower outlets*

Warm Climate**

1

1

1 - 2

1 - 3

1 - 3

2 - 4

No. of shower outlets*

Cool Climate**

1

1

1

1 - 2.5

1 - 2.5

2 - 3

*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.
** Warm climate zones generally cover northern and central Australia, while cool climate zones apply to southern regions including VIC, TAS and lower parts of SA, WA and NSW.

For more information, consult with your hot water specialist.

If you’re unsure which hot water system is right for you contact one of our hot water specialists to request a quote here.

Rinnai Infinity B Continuous Flow systems deliver a superior hot water solution through advanced energy efficient technology. Compared to traditional storage systems, they offer substantial space savings and eliminate standby heat losses by heating water only on demand. This results in lower long-term operating costs and improved overall system efficiency.

The combination of performance, reliability, and cost-effectiveness makes continuous flow the smart choice for modern hot water delivery.

Hot Water System

Annual Energy Cost*

1 Person
(50L per day)#

2 People
(90L per day)#

3 People
(120L per day)#

4 People
(150L per day)#

Continuous Flow Technology

Natural Gas

$235

$400

$530

$655

4 Star Gas Storage Tanks

Natural Gas

$445

$575

$680

$780

5 Star Gas Storage Tanks

Natural Gas

$385

$510

$605

$700

* Costs as at August 2025.
# The above annual energy costs are taken from Sustainability Victoria. Refer to the Sustainability Victoria Government website for more information.

The Energy Star Rating Label, introduced and regulated by the Australian Government for over 30 years, helps consumers compare the energy efficiency and running costs of household appliances.

In simple terms, the more stars a product has, the more energy efficient it is.

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