INFINITY 26L A-Series external Continuous Flow Water Heater

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Only on when you need hot water

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.

Four models to choose from depending on your hot water needs (A16, A20, A24, A26*). Use the Rinnai INFINITY model selector in the 'Suitable for' tab to work out which model is suitable for you.

* Model numbers represent hot water capacity, for example the A26 produces 26 litres of hot water per minute at a 25 degree Celcius rise.


Suitable for:
• external residential applications only
• mains and medium pressure systems

Hard or acidic water will need to be treated to use this product.

  • They are not suitable as a spa or swimming pool heater
  • They are not suitable for hydronic applications
  • They are not suitable as a gas boost for solar installations, or connection with an iHeat, as the temperature cannot be set high enough—use our HD or EF models instead

Gas type

Available for Natural Gas or LPG. Specify gas type at the time of purchase.

General clearances
The following diagram has been provided to assist you in determining where (and if) an external continuous flow water heater can be positioned. If in doubt, prior to purchase, consult a licensed gasfitter.

Basic clearances for Rinnai INFINITY A-Series external water heaters

Clearance below eaves, balconies, and other projections is 300 mm.
* Rinnai recommend 1.5 m to give enough clearance for the pipe work, and to safely expel the flue gases.

Rinnai INFINITY model selector

Rinnai INFINITY model selector table
If the maximum water flow for your household exceeds what is listed in the table for your region, two INFINITY units may be required. Please contact your local gasfitter for a recommendation.





Energy Star Rating



Factory preset temp. 55 °C
Model code and REU numbers
  • A16: INFA16N/L - REU-A1620WG-ZK
  • A20: INFA20N/L - REU-A2024WG-ZK
  • A24: INFA24N/L - REU-A2426WG-ZK
  • A26: INFA26N/L - REU-A2626WG-ZK
Hot water capacity
  • A16: 2.1-16 L/min
  • A20: 2.5-20 L/min
  • A24: 2.1-24 L/min
  • A26: 2.1-26 L/min
Input and output A16: Input: 16.3-124 MJ/h, output 27.4 kW
A20: Input: 19.9-156 MJ/h, output 33.9 kW
A24: Input: 16.3-184 MJ/h, output 41.4 kW
A26: Input: 16.3-199 MJ/h, output 44.2 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.
Ignition system Direct electronic ignition
Injector sizes A16: NG: 0.9, 1.50, LPG: 0.71, 1.09
A20-A26: NG: 1.08, 1.80, LPG: 0.73, 1.12
Line pressure (min.) NG: 1.13 kPa, LPG 2.75 kPa
Line pressure (max.) 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: 47 W (A16), 58 W (A20), 56 W (A24), 66 W (A26)

Standby: 2 W

Automatic Frost Protection: 68 W 

Pressure relief

Valve opens at 2060 kPa

Valve closes at 1479 kPa

Noise level 50 dB(A)
NOx af 35 ppm
Safety devices Flame failure, boil-dry protection, overheat protection, fusible link, pressure relief valve and combustion fan rpm check
Water supply

Nominal operating pressure:

- 120-1000 kPa (A16)
- 160-1000 kPa (A20)
- 200-1000 kPa (A24 & A26)


Activation flow rate: 1.5 litres per minute


A16 = 13 kg, A20 = 14 kg, A24 and A26 = 15 kg


ES: Supplier Declaration of Compliance

Declaration numbers:

• A16 - 1825920179

• A20 - 1825820179
• A24 - 1825720179

• A26 - 1825620179

Market release 2018

Rinnai INFINITY A-Series connections and fittings diagram and table


Rinnai INFINITY A-Series dimensions diagram

Shipping cost

New Zealand

  • Delivered using Appliance Star Delivery Service and/or reputable New Zealand Logistics Companies.
  • A track and trace can be provided.
  • Signatures are required on these parcels.
  • In the event that your parcel does not arrive with 15 working days of placing the order, please notify us.

Order Processing Time

  • Orders are processed within 3 to 5 working days of receipt (processing time does not include weekend and public holidays).
  • Orders placed on Saturday and Sunday will be processed on the following Monday.
  • Orders are processed and shipped on business days only (Monday through Friday, excluding holidays).
  • You should contact us immediately for any urgent items on your order.

Shipment Lead Time

  • Shipping time depends upon location and customs.
  • New Zealand Delivery can take 1 to 4 business days plus our processing time as mentioned above.


Track and Trace

New Zealand

Yes. Track and trace is available for domestic parcels. If you would like to receive your tracking number, please contact us or simply write your request during check out.