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Compact P2 AIR9 E-Silent

Compact P2 AIR E-SILENT is a compact and complete energy solution for ventilation, heat recovery, space heating, cooling, and domestic hot water. The solution combines the Compact P2 AIR ventilation unit with the ultra-quiet AIR9 E-SILENT air-to-water heat pump, integrating all essential home comfort functions into one energy-efficient system.

The system requires only 0.56 m² of floor space and is suitable for single-family homes and terraced houses with a ventilation requirement of up to 425 m³/h.

Compact P2 AIR provides ventilation with efficient heat recovery, domestic hot water production, and intelligent control of the entire system, while AIR9 E-SILENT delivers energy-efficient heating. During warm summer days, AIR9 E-SILENT can remain switched off while the ventilation unit continues to maintain a comfortable indoor climate with low energy consumption.

AIR9 E-SILENT uses the natural refrigerant propane (R290) and operates at a sound level of only 40 dB(A), making it one of the quietest solutions on the market. The low sound level provides greater flexibility when positioning the outdoor unit closer to property boundaries without disturbing the surroundings.

Its high energy efficiency ensures economical operation, with the heat pump capable of delivering more than five times as much heat energy as the electricity it consumes under normal conditions. At the same time, the high heat recovery efficiency contributes to low overall energy consumption.

AIR9 E-SILENT is available in white, black, anthracite grey, and aluzinc, making it easy to match the architecture of the home.
 

Airflow (see planning data for SEL/SFP values)

Min : 100 m3/h
Max : 425 m3/h

The “heart and lungs” of the home

Compact P2 AIR is an unconventional ventilation unit that, unlike traditional ventilation systems, recovers up to 95% of the energy in the extract air through a highly efficient counterflow heat exchanger. The remaining energy is utilised by the integrated heat pump for domestic hot water production.

Together with the external AIR9 air-to-water heat pump, Compact P2 AIR forms a complete solution for ventilation, heat recovery, domestic hot water, and space heating. Compact P2 AIR includes the necessary hydraulic components, including a buffer tank and control system, ensuring efficient cooperation with the heat pump for heating via underfloor heating or low-temperature radiators.

Passive heat recovery

Compact P2 AIR recovers heat from the extract air through a highly efficient counterflow heat exchanger with a temperature efficiency of up to 95%. The fresh outdoor air is heated by the warm extract air, ensuring a healthy indoor climate with minimal heat loss and lower energy consumption.

At low outdoor temperatures, frost may form in the heat exchanger due to the high heat recovery efficiency. The unit is therefore equipped with an intelligent defrost function that automatically ensures stable operation.

Compact P2 AIR is also available as a Polar model with a built-in frost protection preheater. This reduces the risk of frost formation and ensures high heat recovery even on cold winter days.

Passive and active heat recovery

When the integrated heat pump is not producing domestic hot water, it can instead be used to post-heat the supply air and thereby contribute to space heating.

This function is activated automatically if the desired indoor or supply air temperature has not been reached. It provides additional comfort and a more stable indoor temperature.

When the heat pump heats the supply air, part of the energy is simultaneously transferred to the hot water tank. As a result, the domestic hot water temperature may temporarily exceed the set value.

Domestic hot water

The energy still present in the extract air after heat recovery is utilised by the integrated heat pump for domestic hot water production.

As standard, Compact P2 AIR is equipped with a software-based anti-scalding protection limited to 60 °C. For higher domestic hot water demand, a physical anti-scalding valve is recommended, allowing the temperature in the hot water tank to be increased further.

Compact P2 AIR can be supplied with an integrated solar coil in the hot water tank. This makes it possible to supplement heating with external energy sources such as solar thermal energy, district heating, or the AIR air-to-water heat pump.

Anti-legionella function
Compact P2 AIR features an integrated anti-legionella function that can be activated manually or automatically to help prevent legionella bacteria growth and ensure hygienic operation.

100% bypass function

On warm days, Compact P2 AIR can automatically help reduce the indoor temperature.

When the outdoor temperature exceeds 14 °C, summer mode is activated, and the unit will attempt to cool the home if the indoor temperature exceeds the desired level.

If the outdoor air is cooler than the indoor air, the bypass function opens automatically and directs the air around the heat exchanger. This supplies cooler fresh air to the home without heating it.

If the outdoor air is warmer than the indoor air, the air passes through the heat exchanger, where the cooler extract air is used to cool the supply air. This is known as cooling recovery and contributes to a more comfortable indoor climate.

When the ventilation section is operating in cooling mode, the AIR air-to-water heat pump is automatically stopped to prevent the systems from counteracting each other. However, opposite operation can be enabled, allowing, for example, underfloor heating in the bathroom to continue providing heat.

Active cooling

The integrated heat pump in the ventilation unit is reversible and can therefore both heat and cool the supply air.

When the bypass function is no longer sufficient to maintain the desired indoor temperature, the unit can activate active cooling via the heat pump.

Active cooling must be enabled manually in the control system, as the function consumes electricity. However, the energy is not wasted, as the heat removed during cooling is transferred to the hot water tank and used for domestic hot water production.

For high cooling demand, a physical anti-scalding valve is recommended so the temperature in the hot water tank can be increased further.

Air to water heat pump

The AIR air-to-water heat pump delivers energy-efficient heating to the home via underfloor heating or low-temperature radiators.

The heat pump works together with the home heating controls and automatically adjusts heat production according to demand. When the room thermostats detect a heating requirement, the AIR heat pump ensures efficient and comfortable heating.

When the ventilation section is operating in cooling mode, the AIR air-to-water heat pump is automatically stopped to avoid conflicting operation. However, simultaneous operation can be enabled so that, for example, bathroom underfloor heating can remain active during cooling operation.

Domestic hot water
The AIR air-to-water heat pump does not produce domestic hot water directly, but it can assist Compact P2 AIR during periods of high hot water demand.

If Compact P2 AIR is equipped with a solar coil, the AIR heat pump can contribute to heating the domestic hot water tank, thereby increasing the total capacity.

An additional 250-litre hot water tank (SHW) can also be added, allowing the AIR heat pump to preheat the domestic hot water before it is reheated in Compact P2 AIR. This provides extra comfort in homes with high domestic hot water demand.

 

Compact P2

Energy efficiency class for hot water production A
Consumer profile, water heater L (Large)
Hot water tank 180l
Dimensions (W x D x H) 900 x 610 x 2153 mm
Weight 260 kg (incl. AIR9 Buffer tank)
Plate type casing Aluzinc steel plate, white powder coating RAL9016
Heat exchanger type Polyethylenterephthalat counterflow heat exchanger
Fan type EC, constant rotation
Filter class Greencycle ISO 16890 Coarse 75% (G4)
Duct connections Ø160 mm
Refrigerant R134a
Refrigerant filling 2 kg
Condensate drain PVC Ø20 x 1,5 mm
Supply voltage 230V 50/60 Hz
Max. input/power 2.2 kW / 9.6 A *1  -  3.4 kW / 14.8 A *2
Standby power 3 W
Tightness class IP31
Ambient temperature -20 / +40 °C
External leakage < 1.82 % *3
Internal leakage < 2.04 % *4


*1 - Input without heating element (accessory)
*2 - Input Compact Polar
*3 - According EN 308/EN 13141-7
*4 - According EN 308/EN 13141-7

 

 

AIR9 E-Silent air-to-water heat pump

Dimensions (B x D x H) 938 x 673 x 1318 mm
Weight 165 kg
Sound power level 38,6-56,1 dB(a) *
Rated heat output 1,36-7,86 kW *
Rated air flow rate 3000 m3/h

* Depending on a potential limit to the performance of the compressor. You can limit the heat pump to a certain level of performance to achieve less noise at maximum operation.

 

Energy efficiency class space heating, low temperature 35°C A+++
Energy efficiency class space heating average temperature 55°C A+++
Supply voltage (inside part) 3 x 400 (3 x 230V), N, PE, 16A, 50 Hz
PMAX (inside part) 6,5 kW
Fuse size (inside part) 16A
Standby electricity consumption 10 W
Supplementary electrical heating 2 kW + 3 kW
Buffer tank (integrated) 50 L
Opening pressure safety valve (central heating) 2,5 bar
Expansion vessel (central heating) 10 L
Booster expansion vessels 0,5 bar
Max. air volume 3.400 m3/h
Variable compressor 20 – 100 %
Tightness class fan IP54
Supply voltage (outside part) 230V 1 N+PE, 50Hz
PMAX (outside part) 3300 W
Fuse size (outside part) 16 A
Rated output, (max/min) A-Pump 44W / 3W
Rated output, (max/min) A-Pump 0,45A / 0,05A
Condenser pressure loss (central heating) 6,9 kPa ved 0,28 L/s
Central heating connection 3/4”
Refrigerant R290
Refrigerant filling 1,6 kg
Pressostat low pressure (on/off) 0 bar G
Pressostat high pressure (on/off) 28 bar G
Operating temperatures -25 °C → 50 °C
Central heating, flow temperature 15°C → 55°C
Connection dimension 1”
SCOP low temperature (35°C) testet according to EN14825:2022* 5,33
  - P_rated (tude -10°C) 5,2 kW
  - COP (at -10°C) 2,84
SCOP average temperature (55°C) testet according to EN14825:2022* 3,98
   - P_rated (tude -10°C) 4,7 kW
   - COP (at -10°C) 2,11
Cooling capacity / EER at 7°C/35°C 7,59 kW / 3,3
Cooling capacity / EER at 12°C/35°C 9,57 kW / 4,7
Cooling capacity / EER at 18°C/35°C 11,86 kW / 6,2

*SCOP (Seasonal COP) is based on an average climate, with variable exhaust air temperature, variable supply temperature, variable flow, and reversible operation.

 

Capacity

Capacity of standard unit as a function of qv and Pt ext

SEL values according to EN 13141-7 are for standard units with ISO 16890 Coarse 75% (G4) filters and without heating element.

SEL values comprise the unit’s total power comsumption excl. control.

Conversion factor: J/m3 : 3600 = W/m3/h.

NB! The SEL values are measured and stated as a total value for both fans.

 

Temperature efficiency

Temperature efficiency as a function of volume flow qv [m3/h] for unit with counterflow heat exchanger.

Temperature efficiency according to EN13141-7 (2°C / 20°C).

NB! The temperature efficiency, is for the heat exchanger only (without heat pump operation).

 


COP (air-air)

Heat output factor COP [-] supply air as a function of outdoor temperature t20 [°C] and volume flow qv [m3/h] in accordance with EN14511 at a room temperature t11 = 20°C

NB! COP according EN14511 is calculated for the heat pump and counter flow heat exchanger combined.


Heat output supply air

Heat output Qc [W] as a function of qv [m3/h] and outdoor air temperature t20 [°C]. In accordance with EN 14511, t11=20°C (extract air).

Heat output is the contribution to room heating added to the fresh air via Compact P2 to the supply air.

The ventilation loss is the heat output that is lost without heat recovery at the given volume flow air.


Cooling effect

Cooling effect Q [kW] as a function of volume flow [m3/h] according to EN14511, extract air = 27 °C, outdoor air = 35°C.

The cooling effect is the contribution added to the fresh air via the Compact P2 to the supply air.


 

Energy efficiency ratio

Energy efficiency ratio EER [-] for supply air as a function of volume flow [m3/h] acc. to EN 14511 at extract air temp. = 27 °C and outdoor air temp. = 35 °C.

NB! COP according to EN 14511 is calculated for the heat pump and counter flow heat exchanger combined.

Sound data

Sounddata is for qv = 275 m3/h and Pt ext = 100 Pa in accordance with EN ISO 3744 for surface and EN 5136 for ducts.

Sound output level LWA drops with falling air volumes and falling back-pressure.

At a given distance, the sound pressure level LpA will depend on the acoustic conditions at the installation site.

 

You can download AutoCad or Revit drawings with BIM data on several Nilan ventilation and heat pump solutions - the list is constantly being expanded.
With BIM data, you get all the necessary technical data to draw and calculate Nilan constructions in 3D.

Click here to get more about BIM data on Nilan units

 

Compact P2 AIR (inside part)

All dimensions are in mm. 

Connections:
1. Outdoor air
2. Supply air
3. Extract air
4. Discharge air

 

AIR9 E-Silent (outside part)

The CTS602 control system is an advanced control system with many settings options. The control system is supplied with factory default settings that can be adapted to the operational requirements in order to achieve best possible operation and utilisation of the unit.

The HMI Touch panel provides an overview of the current operation of the unit. The structure of its menu makes it easy to navigate for both user and installer. You can choose from 2 different images for the main screen.

External communication
The CTS602 control system has an open Modbus RS485 protocol that can be used for communication via external CTS systems. The Modbus connection is used for e.g. Schneider's IHC or KNX systems.

Functional overview   +Standard
-Accessories
Filter monitor Filter monitor with timer notifies when it is time to change filters. Can be set between 30 and 180 days. +
Operating mode Can be set to Auto according to set values or set to heating or cooling mode. +
Stepless regulation The four ventilation steps can be set steplessly 20-100%, with various values for supply air and exhaust air. +
Humidity control Built-in humidity control can be set to high ventilation operation at high humidity (when in the shower) and low ventilation operation if the humidity in the home becomes too low. +
Active cooling The unit can be set to cool the supply air in the summer, should the need arise. When the heat pump cools, the heat is deposited in the hot water tank, so that you get “free” hot water when the unit is in cooling mode. +
Low outdoor temperature It is possible to lower the ventilation at low outdoor temperature, to avoid the indoor humidity becoming too low. +
CO2 control It is possible to control the ventilation level according to the CO2 level in the home. -
Temperature settings The temperature settings are used by the controller to regulate the operation of the entire system. +
Frost protection The control has an automatic function for defrosting the heat exchanger to prevent formation of ice. +
Frost protection Polar The Polar model has a built-in frost protection preheater to protect the counterflow heat exchanger so no ice occurs. +
Domestic hot water Compact P produces the domestic hot water via the air / air heat pump in the ventilation part. +
Pause domestic hot water It is possible to set the hot water production on pause e.g. if no one is at home. In that way, energy is saved. +
Frost protection domestic hot water To protect the hot water tank, it is fitted with a frost protection function. +
Supplementary electrical heater domestic hot water

If the need for domestic hot water increases and the heat pump cannot keep up, a supplementary electrical heater can be activated to heat the domestic hot water.

 +
Anti-scald protection The control has a built-in scalding protection, which prevents scalding of the users when the hot water tap is opened. +
Anti-Legionella The control has an Anti-Legionella treatment of the domestic hot water that can be activated manually or automatically. +
Anode Electronically monitored anode. Notifies when it is time to replace it to ensure a long service life of the hot water tank.  
SHW tank An additional hot water tank SHW can be connected to the air/water heat pump and preheat the hot domestic water to 45 ºC before it enters the Compact P2 hot water tank. +
AIR domestic hot water
If you order Compact P2 with a solar coil, you can connect the air/water heat pump to the Compact P2 hot water tank. The heat pump can then help produce domestic hot water. This is a good solution if the requirement for domestic hot water is high and there is insufficient space for an SHW tank.
 +
AIR heat pump on/off If the air/water heat pump is not to heat the dwelling for a period of time, it must be switched off manually. +
Cooling/heating simultaneously The control system ensures that the air/water heat pump cannot heat the dwelling when Compact P2 is in cooling mode. However, if you still want e.g. the bathroom floor to be warm in the summer, you can set the control system to cool and heat simultaneously. Compact P2 will then no longer prevent the air/water heat pump from providing heat. +
Weather compensation The flow temperature can be set to follow the outdoor temperature. +
Week program You can set up a week program with different settings depending on how much the dwelling is being used. +
Smart Grid Compact P2 AIR is certified in accordance with the German Smart Grid, which allows the electricity provider to override the operation so it becomes as cost effective as possible for the user. +
User selection program 1 A user selection program enables you to use special settings that override the standard operating settings via a potential-free signal. Used e.g. if a cooker hood is connected to the system. +
User selection program 2 Used as user selection 1, but at the same time has an output signal that can be used e.g. to control a damper. +
Datalog Data Data logging as well as error messages and warnings. +
Output data All current values in the system operation. Most often used for troubleshooting. +
Emergency stop ventilation Do not turn off the ventilation, as this may damage the unit, duct system and in the worst case the home. But it may be necessary to briefly turn off the ventilation e.g. due to a emergency notification. +

You can find further information about all the functions in the Software and Installation instructions for the unit.

 

Compact P2 AIR (inside part)

ATTENTION! When positioning the unit, you should always consider future services and maintenance. It is recommended that you leave a minimum of 60 cm of clear space in front of the unit.

It must be easy to replace filters and it must be possible to replace, for instance, fans and other components.

ATTENTION! The unit must be level to enable proper drainage from the condensate tray.

 

 

AIR9 E-Silent (outside part)

ATTENTION! Place the AIR unit on a stable base, ideally a cast foundation.

An outdoor unit must always be positioned on a firm, horizontal and vibration free surface. Consider securing it to a fixed base. Youvshould also take into account the prevailing wind direction during the cold months when heating is required, as the performance of the heat pump will be reduced if the outdoor unit is exposed to strong winds.

PHI certificate

The Compact P2 is certified by the German Passivhaus Institute, confirming that the unit meets strict requirements for energy efficiency and performance in low-energy buildings.
 

Smart Grid Certificate

The Compact P2 supports Smart Grid technology, allowing the utility provider to manage operation based on electricity prices, ensuring the most cost-effective use of energy.
The system can also be integrated with solar panels and adapted to maximise operation when energy production is at its peak.


EPD – Environmental Product Declaration

The Compact P2 comes with a verified Environmental Product Declaration (EPD), documenting the product’s environmental impact throughout its entire life cycle.
The declaration ensures transparency and can be used in environmentally certified construction projects.
Download ecodesign datasheet here Download ecodesign datasheet here Download ecodesign datasheet here

 

Accessories