Discontinued Product, please contact 0800 RINNAI for more information

Discontinued Product, please contact 0800 RINNAI for more information

Rinnai INFINITY® EFi250 Internal

Rinnai INFINITY® EFi250 Internal
**Last sold Nov 2019, superseded by the N-Series N56kWi internal model**

Rinnai INFINITY® EF condensing continuous flow gas water heaters effectively capture waste heat from the flue gas through the use of a secondary heat exchanger to help heat the water with less energy.

Hot water capacity
1.5 to 37 litres per minute


Suitable for
• Commercial and domestic internal applications
• Mains and medium pressure systems
• Solar installations as a gas boost

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

  • Not suitable as a spa or swimming pool heater
  • Not suitable for hydronic applications

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

Positioning internal units
All continuous flow water heaters must be installed to ensure access can be gained, for servicing and repair, without hazard or undue difficulty. Sufficient clearances shall allow access and removal of all serviceable components.

For internal units we recommend a 600 mm clearance for servicing access. This can be reduced to 50 mm if installed in a cupboard.



Gunmetal Grey


211 MJ/h or 58.6 kW


55.6 kW



Energy Star Rating

REU number: REU-KM3237FFUD-ZK
Factory preset temperature: 55 °C
Rinnai product code: INFEF250FFN/INFEF250FFL


Capacity Hot water capacity: 1.5-37 litres per minute
Nominal water capacity: 32 litres per minute at a 25 ° rise (1920 L/h)
Connections Hot water outlet: R¾ (20 mm)
Cold water inlet: R¾ (20 mm)
Gas supply: R¾ (20 mm)
Condensate: R½ (15 mm)
Exhaust system Forced flue (balanced flued, room sealed fan assisted appliance). Flue dimensions; inner - 80 mm, outer 125 mm
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 size NG: 1.15, 1.9, 1.8*
LPG: 0.75, 1.15, 1.1*
* only one point
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 line pressure down.
Power consumption  Normal: LPG - 92 W, NG - 72 W
Automatic frost protection: 218 W
Standby: 2.4 W
Noise level 50 dB(A)
NOx af < 60 ppm
Safety devices Flame failure, boil-dry protection, overheat protection (OHS), fusible link, pressure relief valve, combustion fan rpm check
Water supply Nominal operating pressure: 240-1000 kPa
Minimum water flow: 1.5 litres per minute
Weight 32 kg
Market release July 2011
Last sold November 2019, superseded by the N-Series N56kWi model
Compliance ES: Supplier Declaration of Compliance
• Declaration Number - 1008720096

Rinnai INFINITY EFi250 dimensions diagram


Bathroom Deluxe Controller

Bathroom Deluxe Controller
Will run a bath for you, turn off the water, then tell you when it's ready. Adjust the water volume of the bath or shower, temperature and the volume of the voice.

Compact Controller (MC601A)

Compact Controller (MC601A)
Our smallest most affordable model. This controller can be installed anywhere in the house.

Kitchen Deluxe Controller

Kitchen Deluxe Controller
Designed for kitchens and laundries, works in conjunction with the Bathroom Deluxe Controller. The voice will tell you in the kitchen when your bath is ready.

Rinnai INFINITY® Error Indication Switch

Rinnai INFINITY® Error Indication Switch
Volt-free, normally open or normally closed switch. The switch will shift to the reverse position when there is an active error in the water heater. The switch is intended to be connected to a monitoring system such as a building management system.

Rinnai INFINITY® Pipe Cover

Rinnai INFINITY® Pipe Cover
A Rinnai pipe cover is available for a streamlined appearance, or to add additional protection in exposed installations.

Rinnai INFINITY® Security Bracket

Rinnai INFINITY® Security Bracket
A sturdy security bracket can be installed to act as a permanent deterrent against theft.

Ducted Gas Heating Service Centre

Ducted Gas Heating Service Centre
Operating 5 days a week, 8am to 5pm, Monday to Friday our New Zealand based customer service centre provides nothing but top quality. If you need to book in a Ducted Gas Heating service, we have a team of providers fully trained and equipped with diagnostic tools to service your appliance when you need them. 

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