Rinnai INFINITY® A26 Graphite® external

Hot water delivered in true style


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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Product Details

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 insstead


"I've just got back from a project in Point Chev with the Graphite colour. The house is dark black, the dark INFINITY is so the right finish!”

Tim Hogarth, Design Lead at Box™

Technical Specifications



Preset temp.

55 °C




15 kg

Order codes and REU number


Gas type

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

Hot water capacity

1.5-26 L/min

Input / output

Input: 16.3-199 MJ/h
Output: 44.5 kW

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.

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.

Power consumption
  • Normal: 66 W
  • Standby: 2 W
  • Automatic frost protection: 68 W
Pressure relief

Valve opens at 2060 kPa, closes at 1470 kPa

Water supply

Nominal operating pressure: 200-1000 kPa

Minimum operating water flow will depend on setpoint and inlet temp.

Please note: If the water inlet pressure drops below the minimum value, operation of the INFINITY is not guaranteed. 

Noise level

50 dB(A), some people are susceptible to low level noise. This needs to be considered if locating near a bedroom.

NOx level

35 ppm

Safety devices
  • Flame failure
  • Boil-dry protection
  • Overheat protection
  • Fusible link
  • Pressure relief valve
  • Combustion fan RPM check
Basic unit dimensions


Energy Safety Supplier Declaration of Compliance: 1825620179

Market release

March 2023