Rinnai INFINITY® EF24 External

Extended two year warranty if installed with controllers
RRP $1,970

Rinnai INFINITY® EF24 External (REU-K2430WG)

This is our most efficient continuous flow gas hot water system. 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
2.3 to 30 litres per minute


Suitable for

• Commercial and domestic external 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. 

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

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.

Clearance below eaves, balconies, and other projections, for all models is 300 mm.

* Rinnai recommend 1.5 m to give enough clearance for the pipe work, and to safely expel flue gases.




162 MJ/h or 45 kW


43 kW



Energy Star Rating

REU number: REU-K2430WG
Factory preset temperature: 55 °C
Rinnai product code EF24NCN/EF24NCL

Capacity Hot water capacity: 2.3 to 30 litres per minute
Nominal water capacity: 24 litres per minute at a 25 °C rise (1440 L/h)
Connections Hot water oulet: R¾ (20 mm)
Cold water inlet: R¾ (20 mm)
Gas supply: R¾ (20 mm)
Condensate: R½ (15 mm)
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 size NG: 0.90, 1.50,   LPG: 0.75, 1.15
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: 50 W, Standby: < 3 W (with one remote), Automatic Frost Protection: 118 W
Noise level 49 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: 2.4 litres per minute
Weight 27 kg
Market release • first released 2008
• relaunched 2011
Compliance ES: Supplier Declaration of Compliance
Declaration Number: 1431020135
• Certificate Number: 7083

Rinnai INFINITY EF24 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

Compact Controller
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® 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 Recess Box - Metal

Rinnai Recess Box - Metal
The metal recess box (white) enables an external continuous flow gas water heater to be recessed (either fully or semi-recessed) into an external wall, behind a door and out of sight.
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