The Rinnai INFINITY A-Series are continuous flow hot water systems for residential applications. These water heaters produce endless hot water, and unlike electric cylinders, are energy efficient as they are only on when you need hot water.
There are five models to choose from depending on your hot water needs. Model numbers represent hot water capacity, for example the A26 produces 26 litres of hot water per minute at a 25 ° Celsius rise.
Suitable for
– external residential applications only (A16-A26)
– internal residential applications only (A28i)
– mains and medium pressure systems
– as a gas boost for solar connections (A28i model only1)
Hard or acidic water will need to be treated to use this product.
Not suitable
– as a spa or swimming pool heater
– for hydronic applications
1 Only unit that can be preset to 75 °C
Available for Natural Gas or LPG, specify at the time of purchase
40, 42, 50, 55, 60, 65 °C (70, 75, 85 °C*)
* A28i model only
| Model | Input MJ/h | Output kW |
| A16 | 16.3-124 | 27.8 |
| A20 | 19.9-156 | 34.9 |
| A24 | 16.3-184 | 42.0 |
| A26 | 16.3-199 | 44.5 |
| A28i | 11-210 | 48.8 |
Fitted as standard. Frost protection operates automatically, as long as the appliance is connected to the electrical power supply, by activating when the temperature inside the unit drops below 3.5 °C, and turns off once the temperature inside the unit reaches 7 °C.
Direct electronic ignition
| Model | NG | LPG |
| A16 | 0.9, 1.50 | 0.71, 1.09 |
| A20-A26 | 1.08, 1.80 | 0.73, 1.12 |
NG – 1.13kPa, LPG – 2.75 kPa
3.5 kPa (maximum standing pressure under abnormal intermittent conditions is 5.0 kPa).
In the case of commercial metering, (i.e. 35-37 kPa coming in), there may be a requirement to regulate the incoming pressure down.
Valve opens at 2060 kPa, closes at 1470 kPa
Nominal operating pressure:
Minimum operating water flow will depend on setpoint and inlet temp.
External units 50 dB(A), internal unit 54 dB(A). Some people are susceptible to low level noise. This needs to be considered if locating an appliance near a bedroom.
Energy Safety Supplier Declaration of Compliance declaration numbers:
A16-A26: 2018
A28i: Dec 2021
Gas & electric hot water heating brochure
Rinnai INFINITY continuous flow water heating spec guide
Rinnai INFINITY A28i flyer
INFINITY continuous flow operation guide
Rinnai INFINITY A-Series EF26 installation guide
Rinnai INFINITY HD49 & A28i installation guide
A28i (and HD49kWi) flue installation guide
A-Series product technical statement
A-Series step-by-step: How to set the gas pressures
A-Series seismic force calculation
A28i (and HD49kWe) seismic force calculation
A-Series exploded diagrams and spares list
A28i exploded diagrams and spares list
Rinnai INFINITY commissioning checklist
EF26 and A-Series commissioning instructions
A-Series step-by-step: How to change outlet temperature
EF26 and A-Series gas conversion
INFINITY HD49 & A28i gas conversion
A16-A26 service manual
A28i (and HD49) service manual
A-Series dataplate information
INFINITY warranty A-EF26-HD-NB
We recommend that Rinnai gas appliances are serviced every two years. This can extend the operating life of your appliance, and also ensures it is running at peak efficiency – saving you and your family money. To book a service, phone 0800 RINNAI (0800 746 624) or fill in our form online.
We realise there’s a lot of information out there. Water heating is important and it’s better to spend the time up front deciding on what you need and what’s important.
We have an experienced customer service team that can walk you through the process. For those more complicated projects we also have a free specification service. Give us a call: 0800 RINNAI (0800 746 624)
They are both continuous flow water heaters but the Rinnai efficiency is the latest generation of water heater with an efficiency of at least 92% or more, compared to 80% of the standard Rinnai INFINITY®. The Rinnai efficiency has an additional heat exchanger. The second heat exchanger enables the efficiency range to extract even more heat from the gas, meaning less energy is required to meet your hot water requirements.
Digital controllers allow you to select the exact temperature of the hot water at the outlet. This has a number of benefits:
Installation costs are difficult to provide as every installation is different. Factors such as the length of pipe required, whether you have accessories fitted, how far away you live and choosing an internal or an external unit all influence the overall cost.
If you’re interested in a Rinnai hot water heating solution, we highly recommend you contact a plumber/gas fitter who will be able to explain all the options to you.
A 9.0 kg cylinder is only capable of delivering a max of around 19mJ/hour. A Rinnai INFINITY® A26 requires 199mJ/hour. Inadequacy of gas supply will cause frequent error code 11 and the appliance will fail.
The gas from a 9kg bottle is likely to be very dirty and this residue has the potential to block/congest the gas valve and damage the appliance. As the 9kg bottle will not provide an adequate supply of gas for the appliance, the installation is not compliant. When an appliance is being run in a non-compliant (with the NZ regulations) installation, Rinnai will not accept any warranty on the product.
Hot water plays a huge role in our everyday lives – from our showers, to washing our dirty dishes, to making our favourite hot drinks
The release of the Climate Change Commission’s (CCC) advice to the government in June 2021 raised some questions on the future of gas in New
Our Rinnai INFINITY® range of gas hot water appliances take water heating to a whole new level – providing endless hot water to your home.
Our stylish and efficient heating and cooling solutions are designed to bring you total home comfort.
Simply enter the product code and serial number to register a Rinnai product.
