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Aira indoor units including the Aira Indoor Unit and Aira Buffer Tank

Aira indoor units

Your Aira Heat Pump system includes two components that fit seamlessly inside your home; the Aira Indoor Unit and Buffer Tank.

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The Aira Indoor Unit

The Aira Indoor Unit is where hot water is stored and distributed to your home’s taps and showers. 

Available in two sizes - 100 and 250 litres - it is also where all your system information is gathered for an efficient and optimised experience.

Aira Indoor Units specifications

Connectivity
BluetoothBLE 5.3
Wi-FiWi-Fi 6, 2.4 Ghz / 5 Ghz
Thread1.3
EthernetGigabit / RJ45 connector
Design
MaterialsMetal
ColourSignal White / Grey White
FinishMatte
Tank typeStainless steel

New tech for a new heating era

Your indoor unit is full of unique, clever and connected features that heat your home's water with optimal efficiency. We call it Aira Intelligence.
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Learns your home routines for optimal efficiency
From your home's routines to the weather forecast, all your system information is collected by your indoor unit. Based on this data, your system optimises its performance over time.
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Features Intuitive Light Cues
These pulses of light provide real-time updates on the status and activity of your heat pump system.
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Always stays connected
Your indoor unit supports Wi-Fi, Thread, Bluetooth, Ethernet and 4G protocols, ensuring seamless connectivity to your heat pump system for continual optimisation.
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Prepares perfect amount of hot water
The indoor unit works alongside your outdoor unit to quickly and efficiently prepare the perfect amount of hot water. Have guests arriving and temporarily need more? Simply activate Hot Water Plus via your Aira app.
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The Aira Buffer Tank

The buffer tank adopts the same shade of grey as your outdoor unit and is styled to sit seamlessly alongside your indoor unit.

Available in 40 and 100 litres, the buffer tank is where hot water for your radiators and underfloor heating system is stored. They are included in all Aira installations because they improve the reliability of your heat pump system. 

They make sure your heat pump and heating system get the correct flow rate, ensure defrost cycles happen securely and prevent system temperature changes from making knocking sounds. They even improve the durability of your heat pump system by minimising the system's stop and restart sequences during low-demand months.

Aira's indoor units & buffer tanks

Aira Indoor Unit (100L)
Aira Indoor Unit (250L)
Aira Buffer Tank (40L)
Aira Buffer Tank (100L)
ModelAira Indoor Unit (100L)Aira Indoor Unit (250L)Aira Buffer Tank (40L)Aira Buffer Tank (100L)
TypeIndoor all-in-one unitIndoor all-in-one unitBuffer tankBuffer tank
Household sizeSmall to mediumMedium to largen/an/a
Tank size100L250L40L100L
Tank typeStainless steelStainless steelStainless steelStainless steel
InsulationEPSEPSPolyurethanPolyurethan
Max temp tank75 °C75 °C95 °C95 °C
ConnectionsBottomTopSideTop
Dimensions (cm) (w/h/d)50.0 x 110.0 x 50.067.0 x 172.0 x 60.037.5 x 71.537.5 x 155.5
Immersion heater3-9 kW3-9 kWn/an/a
Aira Indoor Unit (100L)
Aira Indoor Unit (100L)
TypeIndoor all-in-one unit
Household sizeSmall to medium
Tank size100L
Tank typeStainless steel
InsulationEPS
Max temp tank75 °C
ConnectionsBottom
Dimensions (cm) (w/h/d)50.0 x 110.0 x 50.0
Immersion heater3-9 kW
Aira Indoor Unit (250L)
TypeIndoor all-in-one unit
Household sizeMedium to large
Tank size250L
Tank typeStainless steel
InsulationEPS
Max temp tank75 °C
ConnectionsTop
Dimensions (cm) (w/h/d)67.0 x 172.0 x 60.0
Immersion heater3-9 kW
Aira Buffer Tank (40L)
TypeBuffer tank
Household sizen/a
Tank size40L
Tank typeStainless steel
InsulationPolyurethan
Max temp tank95 °C
ConnectionsSide
Dimensions (cm) (w/h/d)37.5 x 71.5
Immersion heatern/a
Aira Buffer Tank (100L)
TypeBuffer tank
Household sizen/a
Tank size100L
Tank typeStainless steel
InsulationPolyurethan
Max temp tank95 °C
ConnectionsTop
Dimensions (cm) (w/h/d)37.5 x 155.5
Immersion heatern/a
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The Aira Outdoor Unit draws in and extracts heat from the fresh air outside to heat your home and hot water.

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Your Aira system is full of smart, connected features which heat your home and hot water with optimal efficiency. It's called Aira Intelligence.

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With Aira, the installation of your heat pump system is quick, seamless and all in one place.

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Indoor units FAQs

During our free home energy assessment, a Clean Energy Expert will discuss where your indoor unit will be fitted. In most instances, the indoor unit can be installed in the same location as your previous boiler.

The indoor unit, which distributes water to your taps and showers, can store and heat water to similar temperatures produced by gas or oil boilers (75 °C). However, heating water to such high temperatures is inefficient and unnecessary, especially since temperatures exceeding 45°C at the point of use can lead to scalding. As a result, water is typically heated to lower temperatures to optimise efficiency. Your Aira Technician will set your optimal water temperature during installation.

The buffer tank, which stores water for your radiators and underfloor heating, ensures the temperature of the water running through your heating system sits between 35°C and 55°C. Although this temperature range is lower than that of traditional fossil fuel boilers (60°C to 80°C), our Aira Comfort Guarantee ensures that your heat pump system will maintain a cosy indoor temperature all year round. If not, we'll come out and fix it.

During installation, your Aira Technician will set the amount of hot water your heat pump stores to suit the needs of your household. If you want to change this, you can do so on your Aira Home Energy app.

For a clear idea of how much is left, open your Aira app where your remaining hot water is shown in minutes, not litres. Have unexpected guests arriving and need more? Simply activate Hot Water Plus. Afterwards, your system returns to making your usual amount. ​

As part of the Aira Comfort Guarantee, the 15 Year Performance Guarantee promises a cosy indoor temperature between 18˚C-22˚C, even on the coldest day of the year (depending on the room and based on expected minimum temperatures).

If not, we’ll come out to fix it at no extra cost.

Read our terms and conditions under “warranty” to learn more about our heat pump’s ability to maintain minimum indoor temperature.

You can change your home's target temperature via your Aira Room Thermostat or the Aira Home Energy app.

With the Aira Comfort Guarantee, we promise that our Aira Heat Pumps will continue to provide a cosy indoor temperature for the next 15 years. Or we'll come out to fix it. And, if you want to extend your cover when your 15 years are up, that’s easy and affordable. 

To protect your water from Legionella bacteria, your system will efficiently increase the domestic hot water temperature to at least 65°C every 7 days for 30 minutes. The Legionella prevention process runs between 00:00-04:00 at night. 

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