Rinnai INFINITY® Solar Gas Boost 20 & 24


Discontinued March 2012

Temperature controlled continuous flow gas hot water system designed as a boost for solar installations only. Comes with a flow diversion valve and is preset to 75 °C.

Two models to choose from:

  • Solar gas boost 20 external (REU-VE2015WS)
  • Solar gas boost 24 external (REU-V2422WS)

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Product Details

Suitable for
- Close coupled and split residential and commercial applications
- Mains and medium pressure systems

Hard or acidic water will need to be treated to use this product. Model selection is based on if solar hot water is not available.

Technical Specifications





Gas type

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


Solar 20: 166 MJ/h or 44 kW
Solar 24: 188 MJ/h or 52 kW


Solar 20: 35.6 kW
Solar 24: 42 kW

  • Hot water outlet - R¾ 20A (left)
  • Cold water inlet - R¾ 20A (centre)
  • Gas supply - R¾ 20A (right)
Exhaust system

Forced flue

Ignition system

Direct electronic ignition

Injector size Solar 20

NG: 0.85 mm, 1.30 mm
LPG: 0.70 mm, 1.05 mm

Injector size Solar 24

NG: 1.00 mm, 1.55 mm
LPG: 0.70 mm, 1.05 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 pressure down).

Power consumption
  • Normal 45 W (NG), 52 W (LPG)
  • Standby 1.5 W
  • Automatic frost protection 74 W
Pressure relief

Valve opens at 2060 kPa, valve closes at 1470 kPa

Noise level

49 dB(A)

NOx level

Solar 20 - 42 ppm, Solar 24 - 48 ppm

Safety devices

Flame failure, boil dry, OHS, over temperature, fusible link, combustion RPM check, and overcurrent

Water flow

Water flow control, water flow sensor, and electronic water flow control device

Water supply

Nominal operating pressure: 130-1000 kPa (Solar 20), 160-1000 kPa (Solar 24)
Minimum water flow: 2.4 litres per minute


Solar 20 - 15.5 kg, Solar 24 - 16.5 kg

Market release



March 2012