* 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.

FAQs

• Is a tankless hot water heater unit the same as a continuous flow hot water unit >
  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.
• What size Infinity hot water system should I choose for my house? >

  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. 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.

• How much money will I potentially save per year by installing a Infinity Gas Continuous Flow Hot Water system? >

  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 (50 Litres per day)#	2 People (90 Litres per day)#	3 People (120 Litres per day)#	4 People (150 Litres 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.

• What does the energy Star rating mean? >

  The Energy 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.

The product information on this website (comprising product brochures, warranty information, installation manuals, diagrams, specifications and representations) relates to current products. This information may be different for superseded products. For superseded products please contact Rinnai to confirm product information.