Discontinued Product, please contact 0800 RINNAI for more information

Discontinued Product, please contact 0800 RINNAI for more information

Rinnai Infinity XR18 External (REU-V1818WG)

Rinnai Infinity XR18 External (REU-V1818WG)


Temperature controlled continuous flow gas hot water system for external domestic applications. Factory preset to 55 °C.

Hot water capacity
2.4 to 18 litres per minute.

Continuous flow hot water
This type of hot water system produces endless hot water. Continuous flow is an energy efficient water heating system—it's only on when you need hot water.
Energy efficiency

Suitable for

• External domestic installations
• Low hot water demand applications (small apartments or homes)
• Mains and low pressure systems

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.

Colour: White
Input: 140 MJ/h or 39 kW
Output: 32 kW
Efficiency: 81%


Capacity Hot water capacity: 2.4 to 18 litres per minute
Nominal water capacity: 18 litres per minute at a 25 °C rise (1080 L/h)
Connections Hot water oulet: R¾ (20 mm, left)
Cold water inlet: R¾ (20 mm, centre)
Gas supply: R¾ (20 mm, right)
Exhaust System Forced flue
Ignition System Direct electronic ignition
Injector Size (mm) NG:  0.85, 1.30   LPG: 0.70, 1.05
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: 46 W (NG) and 51 W (LPG), Standby: 2 W, Automatic Frost Protection: 74 W
Pressure Relief Valve opens at 2060 kPa, valve closes at 1470 kPa
Noise Level 49 dB(A)
Nox af 42 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: 100-1000 kPa
Minimum water flow: 2.4 litres per minute
Weight 15.5 kg
Market Release 2006
Discontinued 2009

  All dimensions are in mm  
A Width 350
B Depth 194
C Height of unit 530
D Height including brackets 571
E Hot water outlet from wall 87
F Hot water outlet from centre 105
G Cold water inlet from wall 68
H Cold water inlet from centre 10
I Gas connection from wall 77
J Gas connection from centre 83
K Condensate outlet from wall
L Condensate outlet from centre
M Gas: Length of gas connection (from base)
Cold: Length of cold water inlet (from base)
Hot: Length of hot water outlet (from base)

Rinnai Infinity XR18 External (REU-V1818WG)

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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