Rinnai INFINITY® XR-Series (XR16-XR26)


Discontinued 2011, superseded by the Rinnai INFINITY VT-Series

The Rinnai INFINITY XR-Series are temperature controlled continuous flow gas hot water heaters for residential applications. Factory preset to 55 °C.

Gas continuous flow is an energy efficient heating system as it's only on when you need hot water.

The XR26a / XR26ia models in the range were designed for aggressive water areas (such as Christchurch).

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Technical Specifications





REU numbers
  • XR16: REU-V1620WG
  • XR20: REU-V2024WF
  • XR24: REU-V2426WG
  • XR26a: REU-V2630WGT
  • XR26i: REU-VR2632FFUG
  • XR26ia: REU-VR2632FFUGT
Factory preset temperature

55 °C

  • external residential applications (XR16-XR26)
  • internal residential applications (XR26i only)
  • mains and medium 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 (XR26ia was only available in LPG). Gas type specified at time of purchase.

Hot water capacity
  • XR16: 2.4-20 L/min
  • XR20: 2.4-24 L/min
  • XR24: 2.4-26 L/min
  • XR26: 2.4-30 L/min (incl. XR26a)
  • XR26i: 2.4-32 :/min (incl. XR26ia)
Input and output
Model Input Output
XR16 125 MJ/h 28 kW
XR20 160 MJ/h 35.6 kW
XR24 188 MJ/h 42 kW
XR26 199 MJ/h 44.6 kW
XR26i XR26ia 195 MJ/h 44.5 kW
Exhaust system external models

Forced flue

Flue internal units

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)
XR16 & XR20 0.85, 1.30 0.70, 1.05
XR24 & XR26 1.0, 1.55 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 pressure down).

Power consumption
Model NG LPG Standby Auto. frost protection
XR16 40 W 45 W 2 W 72 W
XR20 47 W 51 W 2 W 72 W
XR24 45 W 52 W 2 W 72 W
XR26 52 W 57 W 2 W 72 W
XR26i XR26ia 65 W 65 W 2 W 100 W
Pressure relief

Valve opens at 2060 kPa, and closes at 1470 kPa

Noise level

50 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:

  • XR16: 120-1000 kPa
  • XR20: 160-1000 kPa
  • XR24: 180-1000 kPa
  • XR26: 130-1000 kPa
  • XR26i XR26ia: 150-1000 kPa

Activation flow rate 2.4 L/min


XR16, XR20, XR24 = 15 kg
XR26 = 17 kg
XR26i, XR26ia = 22 kg


Energy Safety Supplier Declaration of Compliance Declaration numbers:

  • XR16 - 970820094
  • XR20 - 971020094
  • XR24, XR26 - 971120094
Market release



2011, superseded by the VT series