Infinity 28i (Internal)

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.

*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.

* 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.