Discontinued Product, please contact 0800 RINNAI for more information

Discontinued Product, please contact 0800 RINNAI for more information

Rinnai INFINITY® XR20 & XR26 plus external

Discontinued 2009

Rinnai INFINITY® XR20 & XR26 plus ext.

Temperature controlled continuous flow gas hot water system with status monitor for external residential applications. Flangeless case design and pipe cover for a more modern look for those concerned about aesthetics on the outside of the house.

Units are sold with a pipe cover.

Suitable for
• external residential applications
• 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. Gas type specified 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.


Star metallic silver


XR26 plus - 199 MJ/h
XR20 plus - 160 MJ/h


XR26 plus - 44.6 kW, XR20 plus - 35.6 kW



Factory preset temp. 55 °C
REU numbers
  • XR20 plus: REU-VM2024WD
  • XR26 plus : REU-VM2630WD
Hot water capacity
  • XR20 plus: 2.4-24 L/min
  • XR26 plus: 2.4-30 L/min
Exhaust system external units 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 sizes XR20 plus: NG: 0.85, 1.30, LPG: 0.70, 1.05
XR26 plus: NG: 1.0, 1.55, LPG: 0.70, 1.1.05
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 operating

XR20 plus = 46 W (NG), 51 W (LPG)

XR26 plus  = 52 W (NG), 57 W (LPG)

Power consumption standby

 2 W

Power consumption automatic frost protection

72 W 

Pressure relief

Valve opens at 2060 kPa

Valve closes at 1470 kPa

Noise level 50 dB(A)
NOx af XR20 plus - 42 ppm,  XR26 plus - 52 ppm
Safety devices Flame failure, boil-dry protection, overheat protection, fusible link, pressure relief valve and combustion fan rpm check
Water supply

Nominal operating pressure: 190-1000 kPa 

Activation flow rate: 2.4 litres per minute


XR20 plus = 15.5 kg, XR26 plus = 17 kg

Market release 2007
Discontinued 2009

**For unit dimension information, please refer to p.9 of the installation manual**

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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