Aira Indoor Unit
Your Aira Indoor Unit is where it all happens. It is where water heated by the outdoor unit is stored and distributed to your home’s taps and showers. It is where all your system information is gathered and efficiency is optimised thanks to Aira Intelligence. And it's where your system's Intuitive Light Cues tell you what it's doing.
This all-in-one unit is available in two sizes – 100 and 250 litres – to match your home’s hot water needs.
What’s included in this system
The Aira Indoor Unit works seamlessly with a buffer tank and outdoor unit to efficiently heat your home and hot water.
Outdoor unit
The outdoor unit draws in and extracts heat from the fresh air outside to heat your home and hot water.
Buffer tank
The buffer tanks is where hot water for your radiators and underfloor heating system is stored.
Buffer tank
Available in 40 and 100 litres, the buffer tank is where hot water for your radiators and underfloor heating system is stored.
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. This is why they’re included in all Aira installations.
 |  |  |  | |
|---|---|---|---|---|
| Model | Aira Indoor Unit (100L) | Aira Indoor Unit (250L) | Aira Buffer Tank (40L) | Aira Buffer Tank (100L) |
| Description | All-in-one unit | All-in-one unit | Buffer tank | Buffer tank |
| Best suited for | 1-4 people | 1-6 people | n/a | n/a |
| Tank size | 100L | 250L | 40L | 100L |
| Tank type | Stainless steel | Stainless steel | Stainless steel | Stainless steel |
| Insulation | EPS | EPS | Polyurethan | Polyurethan |
| Max temp tank | 75°C | 75°C | 95°C | 95°C |
| Dimensions (cm) (w/d/h) | 50 x 50 x 110 | 67 x 60 x 172 | 37.5 x 37.5 x 71.5 | 37.5 x 37.5 x 155.5 |
| Energy efficiency class 35°c (in combination with heat pump) | A+++ | A+++ | n/a | n/a |
| Connecticity | Bluetooth, Wi-Fi, Thread, Ethernet, Cellular | Bluetooth, Wi-Fi, Thread, Ethernet, Cellular | n/a | n/a |
Aira Indoor Unit (100L)
| Description | All-in-one unit |
| Best suited for | 1-4 people |
| Tank size | 100L |
| Tank type | Stainless steel |
| Insulation | EPS |
| Max temp tank | 75°C |
| Dimensions (cm) (w/d/h) | 50 x 50 x 110 |
| Energy efficiency class 35°c (in combination with heat pump) | A+++ |
| Connecticity | Bluetooth, Wi-Fi, Thread, Ethernet, Cellular |
Aira Indoor Unit (250L)
| Description | All-in-one unit |
| Best suited for | 1-6 people |
| Tank size | 250L |
| Tank type | Stainless steel |
| Insulation | EPS |
| Max temp tank | 75°C |
| Dimensions (cm) (w/d/h) | 67 x 60 x 172 |
| Energy efficiency class 35°c (in combination with heat pump) | A+++ |
| Connecticity | Bluetooth, Wi-Fi, Thread, Ethernet, Cellular |
Aira Buffer Tank (40L)
| Description | Buffer tank |
| Best suited for | n/a |
| Tank size | 40L |
| Tank type | Stainless steel |
| Insulation | Polyurethan |
| Max temp tank | 95°C |
| Dimensions (cm) (w/d/h) | 37.5 x 37.5 x 71.5 |
| Energy efficiency class 35°c (in combination with heat pump) | n/a |
| Connecticity | n/a |
Aira Buffer Tank (100L)
| Description | Buffer tank |
| Best suited for | n/a |
| Tank size | 100L |
| Tank type | Stainless steel |
| Insulation | Polyurethan |
| Max temp tank | 95°C |
| Dimensions (cm) (w/d/h) | 37.5 x 37.5 x 155.5 |
| Energy efficiency class 35°c (in combination with heat pump) | n/a |
| Connecticity | n/a |
Will the indoor unit be installed in the same location as my current boiler?
During our free home energy assessment, a Clean Energy Expert will discuss where your indoor unit will be fitted and suggest the best solution for your household. In some instances, this may be in the same location as your current boiler.
How hot will my water be with an Aira Heat Pump and Aira Indoor Unit?
The hot water temperature is typically set to 55°C for our 250L indoor units and 60°C for our 100L indoor units. This ensures the heat pump operates efficiently while maintaining its capacity. A safety valve is installed outside the unit to prevent scalding.
What is the maximum output temperature the heat pump can provide for my heating with the Aira Indoor Unit?
Your Aira Heat Pump can provide heating system water up to 75°C. However, output temperatures – or flow temperatures – rarely need to be that high for efficient heating. In most homes, a lower flow temperature of around 35-55°C is more than sufficient to keep your home at a warm and comfortable temperature of between 18˚C and 22˚C.
If necessary, the system will automatically adjust to provide higher hot water temperatures to ensure your desired indoor temperature is maintained.
As part of the Aira Comfort Guarantee, our 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.
How does the Aira Indoor Unit protect your water from Legionella bacteria
Your Aira Indoor Unit is equipped with an internal legionella prevention system, ensuring your domestic hot water remains free from harmful bacteria.
Learn more about the Aira Heat Pump system
Aira Outdoor Unit
The Aira Outdoor Unit draws in and extracts heat from the fresh air outside to heat your home and hot water.
Aira Indoor Unit Compact
An alternative to the Aira Indoor Unit, the Aira Indoor Unit Compact manages water flow and gathers system information to optimise your heat pump’s efficiency.
Aira Home Energy app
The Aira Heat Pump takes pretty good care of itself. But you always have control of your system anywhere, anytime, with the Aira Home Energy app.
