Rinnai INFINITY°® XR-Series (XR18, XR26i, XR32, XR32a)


Discontinued 2009-2010, superseded by the VT-Series

Temperature controlled continuous flow gas hot water heaters. Primarily used for residential applications. Four models in the range, including an 'a' aggressive model.

  • XR18 external REU-V1818WG
  • XR26i internal REU-V2632FFUG
  • XR32 external REU-V3237WG
  • XR32a external REU-V3237WGT

Read More

Technical Specifications



  • 80% (XR32a)
  • 81% (XR18)
  • 83% (XR32)
  • 87% (XR26i)
REU numbers
  • XR18: REU-V1818WG
  • XR26i: REU-V2632FFUG
  • XR32: REU-V3237WG
  • XR32a: REU-VR3237WGT
Factory preset temperature

55 °C

  • external residential applications (XR18, XR32, XR32a)
  • internal residential applications (XR26i)
  • mains and medium pressure systems

Hard or acidic water will need to be treated in order to use this product. Exception to this is the XR32a model, which is designed for aggressive water areas such as Christchurch.

Gas type

Available for Natural Gas or LPG (XR32a was only available in LPG). Gas type specified at time of purchase.

Hot water capacity
  • XR18: 2.4-18 L/min
  • XR26i: 2.4-32 L/min
  • XR32 / XR32a: 2.4-37 L/min
Input and output
Model Input Output
XR18 140 MJ/h or 39 W 32 kW
XR26i 195 MJ/h or 54 kW 47 kW
XR32 250 MJ/h or 68 kW 57.6 kW
XR32a 250 MJ/h or 69 kW 55.2 kW
Exhaust system external models

Forced flue

Flue XR26i

Balanced flue room sealed appliance

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 sizes
Model NG (mm) LPG (mm)
XR18 0.85, 1.30 0.70, 1.05
XR32 1.05, 1.65 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 pressure down).

Power consumption
Model NG Standby Auto. frost protection
XR18 46 W 2 W 74 W
XR26i 65 W 2 W 100 W
XR32 / XR32a 72 W 2 W 116 W
Pressure relief

Valve opens at 2060 kPa, and closes at 1470 kPa

Noise level

49 dB(A)

Safety devices

Flame failure, boil-dry protection, overheat protection, fusible link, pressure relief valve and combustion fan rpm check

Water supply

Nominal operating pressures:

  • 100-1000 kPa - XR18
  • 150-1000 kPa - XR26i
  • 140-1000 kPa - XR32
  • 200-1000 kPa - XR32a

 Activation flow rate 2.4 L/min


XR18 = 15.5 kg
XR26i = 22 kg
XR32 = 25 kg
XR32a = 21 kg

Market release

2008 - XR32a


2009, superseded by the VT-Series
XR32a was discontinued in 2010