Discontinued Product, please contact 0800 RINNAI for more information

Discontinued Product, please contact 0800 RINNAI for more information

Infinity 20 External (REU-2406W)

Infinity 20 External (REU-2406W)


Spare parts and conversion are no longer available for this water heater.
Information such as the operating and installation instructions, specification information, and servicing information (in some cases) is still available to help support existing installed models

Temperature controlled external continuous gas flow hot water system with status monitor. Available in two models: REU-2406WA (standard), and REU-2406W-AK (anti frost).

Compatible controllers
• MC-33-2A (kitchen control)
• BC-45-2A (bathroom control)
• BSC-45-2A (ensuite or second bathroom control)

Suitable for
Suitable for homes with up to two bathrooms. External applications only.
Hard or acidic water will need to be treated to use this product.

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

Colour: White and Beige
Input: 20-188 MJ/h
Efficiency: 80%
REU Number:: REU-2406W-A (standard)
REU-2406W-AK (anti frost)


Capacity Hot water capacity: 2.5-24 litres per minute
Nominal water capacity: 20 litres per minute at a 25 ° rise (1200 L/h)
Connections Hot water outlet: R¾ (20 mm)
Cold water inlet: R¾ (20 mm)
Gas supply: R¾ (20 mm)
Exhaust System Forced Flue
Ignition System Direct electronic ignition
Injector Size (mm.) NG: 1.70 mm, LPG: 1.00 mm
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: 55 W, Standby: 8 W, Automatic Frost Protection: 100 W
Preset Temperatures 40, 50, 55, 75 °C (without controllers)
Temperature Range 37-75 °C in 16 steps
Water Supply Minimum operating pressure - 10 kPa
Nominal operating pressure - 150-830 kPa
Minimum water flow - 2.5 litres per minute
Market Release 1985
Discontinued (last sold) 1998
Obsolete April 2013

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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