Rinnai INFINITY® A26 Graphite® external


Hot water delivered in true style it.
A stand out product that doesn’t stand out.

The INFINITY Graphite® has been designed with modern homes in mind. Taking the ever-popular INFINITY A26 and transforming its aesthetic with a new, hand-selected shade of dark grey, the Graphite® unit allows you to enjoy endless hot water while maintaining minimal design disruption to your home’s exterior. This model also meets Light Reflectance Value (LRV) guidelines, providing you with the total confidence and peace of mind that you’re installing the right product for your home – no matter where you live in New Zealand.

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Suitable for 

  • external residential applications only
  •  mains and medium pressure systems 

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 
  • as a gas boost for solar connections1

1 Temperature cannot be set high enough, use our HD models instead.


Colour Graphite®

Output 55 °C

Efficiency 80%

Weight 15 KG


Gas type

Available for Natural Gas or LPG, specify at the time of purchase

Hot water capacity

1.5-26 L/min

Factory preset temperature 

Input: 16.3-199 MJ/h

 Output: 44.5 kW


Model code and REU number 





Hot water capacity 

26 L/min (1560 L/h) at a 25 °C rise  

Exhaust system 

Forced flue  

Frost protection 

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.


Pressure relief 

Valve opens at 2060 kPa Valve closes at 1479 kPa

Line pressure 

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.



Energy Safety Supplier Declaration of Compliance: Declaration number - 1923220199


Power consumption 

Normal: 66 W

Standby: 2 W

 Automatic frost protection: 68 W


Safety devices

Flame failure 
Boil-dry protection 
Overheat protection 
Fusible link 
Pressure relief valve 
Combustion fan
RPM check

Noise level 

50 dB(A) approx. Some people are susceptible to low level noise. This needs to be considered if locating an appliance near a bedroom.



15 kg  



How often should I service my gas appliance?

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. 

There are so many similar products around, what does Rinnai provide that the others don't?

  • As the world’s largest gas appliance manufacturer, Rinnai is widely regarded as the industry leader. 
  • Rinnai products are known throughout the world for their superior quality, safety, technology and sophisticated control systems, all factories are ISO 9001 and/or ISO 14001 certified.
  • We have an established 40 year history in New Zealand. 
  • Rinnai are happy to advise that we now have an IANZ accredited Test Lab for MEPS testing on Hot Water Cylinders. The lab uses the latest in test equipment and can test all type of Hot Water Cylinders for MEPS heat loss testing.

I'm not really clear on any option and it's all getting a bit too confusing, what should I do?

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.

For continuous flow units you promote the use of remote controllers, why?

Digital controllers allow you to select the exact temperature of the hot water at the outlet. This has a number of benefits: 

  • Safety, especially if you have young children, the hot water can be pre-set to a child-safe level 
  • No need to mix hot and cold water, this reduces the changes in water temperature when another tap in the building is turned on
  • You use your continuous flow unit more efficiently as less gas is required to heat water to 40 °C (typical shower temperature) than at 55 °C (which is the default temperature without controllers) 
  • Highlights any problems (disruption in gas supply etc.) by displaying error codes on the controller

I’m trying to factor costs and then compare what’s best. I can find out the cost of the different products but what about installation costs?

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.