Rinnai INFINITY N-Series gas continuous flow water heaters

Super efficient, super smart

Rinnai INFINITY N-Series gas continuous flow water heaters

Available January 2020

The Rinnai INFINITY N-Series are condensing* gas continuous flow water heaters designed for commercial applications and high hot water demand residential installations.

Available as an external unit (N56kWe) or an internal unit (N56kWi).


  • Full stainless steel heat exchanger and internal piping
  • Inverted burner → longer service intervals (burner cleaning no longer required)
  • Inbuilt control panel, parameters easily set
  • Pump connectivity, the N-Series can power and control a circulating ring main
  • Inbuilt temperature sensor, unit can run in-series with a circulating ring main
  • Pre-mix burner, no gas pressure setting required → very easy gas-type conversion
  • Daisy-chain electronic connection, very simple (and low cost) electronic connections
  • Powerful fan allows a lower cost common flue to be installed (available ex-stock) with flue lengths up to 45 m with a 125 mm OD flue

Suitable for
- External commercial and residential applications (N56kWe external model only)
- Internal commercial and residential applications (N56kWi internal model 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

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



16-209 MJ/h


55.5 kW



Factory preset temp. 75 °C (can be preset to deliver up to 85 °C)
N56kWe (ext) code/REU INFN56KWEN/L → REU-N3237WC-ZK
N56kWi (int) code/REU INFN56KWIN/L → REU-N3237FFC-ZK
Hot water capacity 1.5-37 litres per minute. Nominal water capacity is 32 litres per minute at a 25°C rise (1920 L/h)
Exhaust system

External unit → forced flue

Internal unit → room sealed 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
Ingress protection rating IPX5
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: 70 W (NG), 85 W (LPG)

Standby: 2.4 W

Automatic Frost Protection: 154 W (external), 150 W (internal)

Water supply

Nominal operating pressure: 300-1000 kPa

Min. operating pressure: 10 kPa

Min. water flow: 1.5 litres per minute (activation flow rate)

Noise level Internal 49 dB(A), external 54 dB(A)
NOx af less than 50 ppm
Safety devices Flame failure, boil-dry protection, overheat protection, fusible link, pressure relief valve and combustion fan rpm check

29 kg


ES: Supplier Declaration of Compliance

Declaration numbers:


Market release January 2020

N56kWe (external) dimensions

N56 external dimensions line drawing

N56kWi (internal) dimensions

N56kWi internal dimensions line drawing

* Condensing technology utilises a secondary heat exchanger to drive further thermal efficiency by extracting heat from combusted flue gases, making the N-Series models 97% efficient.

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At Rinnai NZ,  adding a touch of magic to life’s daily pleasures is what we are all about so that people can get on with the more complicated challenges in life.  Rinnai makes daily routines, like taking a hot shower or heating your home, simple, enjoyable and stress-free.  

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