top of page

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) 


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.


Factory preset temp.75 °C (can be preset to deliver up to 85 °C)
N56kWe (ext) code/REUINFN56N/L → REU-N3237WC-ZK
N56kWi (int) code/REUINFN56FFN/L → REU-N3237FFC-ZK
Hot water capacity1.5-37 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 protectionFitted 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 systemDirect electronic ignition
Ingress protection ratingIPX5
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. water flow: 1.5 litres per minute (activation flow rate)

Noise levelInternal 49 dB(A), external 54 dB(A)
NOx afless than 50 ppm
Flue combustion analysisCO/CO² for nominal conditions:
- NG maximum load 144 ppm / 9.4%
- LPG maximum load 95 ppm / 10.1%
Safety devicesFlame 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:

• 1911920196

Market releaseJanuary 2020
Q&A 1Can an N-Series be used to replaced an older unserviceable Rinnai INFINITY in a bank of electronically connected appliances? Yes, as long as the N-Series is a slave unit and not the master. Refer attached for more information.

Infinity N Series Internal 56Kw 32L Natural Gas

$3,373.00 Regular Price
$3,195.00Sale Price
    bottom of page