Rinnai INFINITY A-Series external and internal

Only on when you need hot water

The Rinnai INFINITY A-Series are continuous flow hot water systems for residential applications. These water heaters produce endless hot water, and unlike electric cylinders, are energy efficient as they are only on when you need hot water.

There are five models to choose from depending on your hot water needs. Model numbers represent hot water capacity, for example the A26 produces 26 liters of hot water per minute at a 25 ° Celsius rise.

Product Details

Suitable for
– external residential applications only (A16-A26)
– internal residential applications only (A28i)
– mains and medium pressure systems
– as a gas boost for solar connections (A28i model only1)

Hard or acidic water will need to be treated to use this product.

Not suitable
– as a spa or swimming pool heater
– for hydronic applications

1 Only unit that can be preset to 75 °C

Technical Specifications

Colour

White

Preset temp.

55 °C

Efficiency

80%*

*A28i model efficiency is 83.5%

Gas type

Available for Natural Gas or LPG, specify at the time of purchase

Available fixed temperatures

40, 42, 50, 55, 60, 65 °C (70, 75, 85 °C*)
* A28i model only

Codes and REU numbers
  • A16: INFA16N/L, REU-A1620WG-ZK
  • A20: INFA20N/L, REU-A2024WG-ZK
  • A24: INFA24N/L, REU-A2426WG-ZK
  • A26: INFA26N/L, REU-A2626WG-ZK
  • A28i: INFA28FFN/L, REU-VCM2837FF-ZK
Hot water capacity
  • A16: 1.5-16 L/min
  • A20: 1.5-20 L/min
  • A24: 1.5-24 L/min
  • A26: 1.5-26 L/min
  • A28i: 1.4-37 L/min
Input and output
Model Input MJ/h Output kW
A16 16.3-124 27.8
A20 19.9-156 34.9
A24 16.3-184 42.0
A26 16.3-199 44.5
A28i 11-210 48.8
Exhaust system
  • External units – forced flue
  • Internal unit – room sealed 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
Model NG LPG
A16 0.9, 1.50 0.71, 1.09
A20-A26 1.08, 1.80 0.73, 1.12
Line pressure (min.)

NG – 1.13kPa, 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: 47 W (A16), 58 W (A20), 56 W (A24), 66 W (A26), 95 W (A28i)
  • Standby: 2 W
  • Automatic frost protection: 68 W (A16-A26), 120 W (A28i)
Pressure relief

Valve opens at 2060 kPa, closes at 1470 kPa

Water supply

Nominal operating pressure: 

  • A16: 120-1000 kPa
  • A20: 160-1000 kPa
  • A24: 200-1000 kPa
  • A26: 200-1000 kPa
  • A28i: 220-1000 kPa

Minimum operating water flow: 1.5 litres per minute (depends on setpoint and inlet temp.)

Please note: If the water inlet pressure or flow rate drops below the minimum values stated above, operation of the INFINITY is not guaranteed. The unit requires both minimum flow rate and pressure to operate correctly.

Noise level

External units 50 dB(A), internal unit 54 dB(A). Some people are susceptible to low level noise. This needs to be considered if locating an appliance near a bedroom.

NOx af

35 ppm (40 ppm A28i)

Safety devices
  • Flame failure
  • Boil-dry protection
  • Overheat protection
  • Fusible link
  • Pressure relief valve
  • Combustion fan RPM check
Weights
  • A16: 13 kg
  • A20: 14 kg
  • A24/A26: 15 kg
  • A28i: 21 kg
Compliance

Energy Safety Supplier Declaration of Compliance declaration numbers:

  • A16 – 1825920179
  • A20 – 1825820179
  • A24 – 1825720179
  • A26 – 1825620179
  • A28i – DEC-000001841X8M7
Market release

A16-A26: 2018
A28i: Dec 2021