Ideal Clima Kers+25 Ultra-Quiet Fresh Air Valve with Heat Recovery – Fresh Air with Low Energy Consumption
A compact and quiet ventilation solution for the modern home
The Ideal Clima Kers+25 is an ultra-quiet fresh air vent with heat recovery—or a local heat recovery unit—that helps improve indoor air quality in apartments, smaller living spaces, and offices. The unit removes stale, humid air and replaces it with fresh, filtered air, while retaining up to 97% of the room’s thermal energy.
Problems often arise in today’s well-insulated buildings:
- poor ventilation
- excess moisture
- condensation on windows
- high CO2 levels
- stuffy indoor air
- risk of mold growth
Ideal Clima Kers+25 helps solve these problems in an energy-efficient and quiet manner, without the need for a complex ventilation system.
Why choose Ideal Clima Kers+25?
- Heat recovery of up to 97%
- Very quiet operation for everyday use
- Airflow up to 25 m³/h
- Energy-efficient EC fan
- Wi-Fi readiness
- Remote control included
- Automatic humidity-based ventilation
- Ceramic Antibacterial Heat Exchanger
- G3 filters in both airflow directions
- Automatic Night Mode
- Easy installation through an exterior wall
- Suitable for bedrooms and smaller rooms
Problem: There’s no fresh air, but I don’t want to open the window
Many apartments and smaller rooms do not have adequate ventilation. As a result:
- the air becomes heavy
- moisture accumulates
- Sleep quality declines
- Odors develop in the room
- The risk of mold growth increases
Ventilating by opening a window does help refresh the air, but in the winter, a large amount of heat is lost in the process.
Solution: Fresh-air damper with heat recovery
The Ideal Clima Kers+25 uses regenerative heat recovery technology. The unit extracts warm air from the room, stores its energy in a ceramic heat exchanger, and uses it to preheat the incoming fresh air.
The result is:
- fresher indoor air
- lower heating costs
- less moisture
- better indoor climate
- Energy-efficient ventilation year-round
Ultra-quiet operation in the bedroom
One of the biggest advantages of the Ideal Clima Kers+25 is its very quiet operation. Thanks to its EC motor and automatic night mode, the unit is ideal for:
- into the bedroom
- children’s room
- to the home office
- smaller living spaces
Noise reduction at night helps ensure a more restful sleep and a more comfortable indoor environment.
Smart Wi-Fi Control
KERS+25 comes standard with Wi-Fi capability and allows you to control the device via a smartphone using a Wi-Fi adapter. You can:
- adjust the ventilation speed
- use automatic modes
- control the device remotely
- connect multiple devices into a single system
Ceramic Antibacterial Heat Exchanger
The Kers+25 uses a ceramic heat exchanger with an antibacterial coating, with an efficiency of up to 97%. This helps:
- improve hygiene
- reduce the spread of bacteria
- improve energy efficiency
- ensure stable ventilation
Easy installation in an existing building
The unit is installed through an exterior wall and does not require a complex ventilation duct system. This makes the Kers+25 particularly suitable for:
- into apartments
- buildings undergoing renovation
- into smaller rooms
- into existing residential buildings
Where is the Ideal Clima Kers+25 fresh air damper used?
The Ideal Clima Kers+25 is well-suited for:
- into the bedrooms
- into apartments
- smaller living spaces
- home offices
- children’s rooms
- small offices
- rooms without central ventilation
Technical Specifications
- Maximum airflow: 25 m³/h
- Heat recovery: up to 97%
- Ceramic Antibacterial Heat Exchanger
- EC Energy-Efficient Fan
- G3 filters on both sides
- Wi-Fi readiness
- Remote Control
- Automatic Night Mode
- Humidity-Based Ventilation Control
- Wind-resistant exterior roller shutter in accordance with the EN 13141-8 standard
FAQ – Frequently Asked Questions
What is Ideal Clima Kers+25?
Kers+25 is a local heat-recovery ventilation unit—or fresh-air valve—that helps ensure clean indoor air and reduce heat loss.
Is the Kers+25 suitable for an apartment?
Yes, the unit is very well suited for apartments and rooms without central ventilation.
How effective is heat recovery?
The efficiency of a ceramic heat exchanger can reach up to 97%.
Does the device help reduce humidity?
Yes, continuous ventilation helps reduce excess moisture and the risk of mold growth.
Is the Kers+25 suitable for a bedroom?
Yes, its ultra-quiet operation makes this device ideal for bedrooms and smaller living spaces.
Can the device be controlled with a phone?
Yes, the device is Wi-Fi-enabled and can be controlled via a smartphone.
Is installation difficult?
No, the unit is installed through an exterior wall and does not require complex piping.
Does Kers+25 help save on heating costs?
Yes, heat recovery helps reduce heat loss associated with ventilation and improve energy efficiency.
All equipment that complies with European directives is marked with the CE mark (TÜV) and comes with the corresponding certificate of conformity.
Specifications
VRKS27W – KERS+ 25 Precision Heat Recovery Unit with Remote Control
A spot heat recovery unit for installation within perimeter walls, featuring a high-efficiency hexagonal ceramic heat exchanger capable of handling a maximum airflow rate of 25 m³/h, alternating between supply and exhaust modes, with a useful internal volume of up to 25 m³. Equipped with an automatic air barrier damper in accordance with Regulation CE13141-8, a night mode (nighttime noise reduction), and a humidity control function. Sound pressure level at a distance of 3 m below 29 dB in accordance with the UNI EN ISO 3746:1997 standard; external noise attenuation of 44 dB; energy-efficient EC motor; power consumption below 3.35 W. A remote control is included, and Wi-Fi capability is standard.
KERS+ devices are designed to perform the following functions in every room:
- Supply fresh air taken from outside the building at a flow rate of up to 100 m³/h
- Recover up to 97% of the heat from the stale air extracted from rooms to heat (in winter) or cool (in summer) the incoming air before it enters the room, resulting in significant energy savings.
- Filter the incoming air and the air being extracted from the rooms.
These units are designed for use in residential buildings, specifically for ventilating rooms where centralized ventilation is not considered feasible. They can be installed through walls and are therefore particularly well-suited for renovations and partial renovations of rooms where mold is forming due to inadequate ventilation or where CO2-rich air needs to be removed.
The maximum airflow rate for each unit is available in four sizes: 25, 50, 60, and 100 m³/h, depending on the model. Since they operate 50% of the time in exhaust mode and 50% of the time in supply mode, the air exchange rate is reduced to 12, 25, 30, and 50 m³/h, respectively. KERS+ heat recovery units ensure sufficient air exchange for rooms with floor areas of 9, 18, 22, and 37 m², depending on the model (with an air exchange rate of 0.5 vol/h and an interior height of 2.7 m).
The machine is equipped with an EC motor fan with energy recovery, which is capable of reversing the airflow in the recovery unit and operates in two phases:
Stage 1:
The fan draws hot air from the room and sends it through the heat recovery unit to the outside. This cools the air while retaining the heat it contains.
Stage 2:
The fan reverses the airflow and draws in cool air from outside. When this air comes into contact with the heat recovery unit, it is warmed before entering the room.
The remote control included as standard equipment allows you to:
- Use Kers+ only in extraction mode or only in input mode.
- Adjust the fan speed according to the desired humidity level.
- Setting up automatic night dimming
- Set up automatic ventilation based on three humidity thresholds
- To quickly remove unpleasant odors, activate the boosted suction function at maximum speed for 30 minutes.
- Turn Kers+ on and off.
Using the device’s buttons, you can:
- Set three operating speeds
- Configuring heat recovery and activating automatic nighttime dimming
- Displays operating speed and the need to clean the filters using LEDs
To install the recovery unit, drill a through-hole in the perimeter wall for KERS+ 25/50/60/100 Wi-Fi-ready devices, with a minimum diameter of 102/162/162/202 mm, at a 2° or 3° angle outward. The channel can be adjusted according to the actual thickness of the wall. All that is required is a 110–230 Vac power source using a 2×1.5 mm² cable. Control is via the device’s retractable buttons, the remote control included in the package, a free remote control adapter, or Wi-Fi.
Price: 44 euros per km
Technical Specifications
Technical Specifications
| Description | KERS+ 25 Precision Regenerative Brake with remote control |
KERS+ 50 Precision Regenerator with remote control |
KERS+ 60 Precision Regenerative Brake with remote control |
KERS+ 100 Precision Regenerative Brake with remote control |
|
| Code | VRKS27W | VRKS52W | VRKS60W | VRKS00W | |
| Airflow at maximum speed | m/h | 25 | 50 | 60 | 100 |
| Ventilation | m/h | 12.5 | 25 | 30 | 50 |
| Efficiency of a Ceramic Heat Recovery Unit | % | up to 97% | up to 97% | up to 94% | up to 94% |
| Temperature of the treated air | °C | -20 / +40 | -20 / +40 | -20 / +40 | -20 / +40 |
| Thermal energy recovered during the summer | 65 | 148 | 160 | 280 | |
| Temperature of the treated air | °C | -20 / +50 | -20 / +50 | -20 / +50 | -20 / +50 |
| Electrical energy absorbed at maximum speed | 3.35 | 4.97 | 4.8 | 10.5 | |
| Electric current absorbed at maximum speed | UNTIL | 0,016 | 0,024 | 0,022 | 0,05 |
| Built-in filters | – | 2 | 2 | 2 | 2 |
| Filter Class EN 779 | – | G3 | G3 | G3 | G3 |
| Connection | V/phase/ Hz |
230/1/50 | 230/1/50 | 230/1/50 | 230/1/50 |
| Diameter of the hole in the wall | mm | 102 | 162 | 162 | 202 |
| Minimum wall thickness | cm | 28 | 28 | 28 | 28 |
| Defense | – | IPX4 | IPX4 | IPX4 | IPX4 |
Kersi Flow Rate and Noise Table – The Quietest Device on the Market
| SPEED | Description | um | KERS+ 25 (VRKS27W) |
KERS+ 50 (VRKS52W) |
KERS+ 60 (VRKS60W) |
KERS+ 100 (VRKS00W) |
| Maximum | Airflow velocity | m³/h | 25 | 50 | 60 | 100 |
| Effective replacement current rate | m³/h | 12.5 | 25 | 30 | 50 | |
| Sound pressure at a distance of 3 m | dB(A) | 28,5 | 25.8 | 26.4 | 29.2 | |
| Average | Airflow velocity | m³/h | 17,5 | 35 | 42 | 70 |
| Effective replacement current rate | m³/h | 8.7 | 17,5 | 21 | 35 | |
| Sound pressure at a distance of 3 m | dB(A) | 19 | 16,5 | 16,5 | 20 | |
| Minimum | Airflow velocity | m³/h | 9 | 19 | 22 | 50 |
| Effective replacement current rate | m³/h | 4.5 | 9.5 | 11 | 25 | |
| Sound pressure at a distance of 3 m | dB(A) | 7.8 | 7.6 | 7.6 | 15 | |
| Superminimum | Airflow velocity | m³/h | 7 | 12 | 16 | 40 |
| Effective replacement current rate | m³/h | 3.5 | 6 | 8 | 20 | |
| Sound pressure at a distance of 3 m | dB(A) | 4 | 4 | 5 | 11 | |
| Acoustic attenuation of external noise with the fan turned off | dB(A) | 44 | 42 | 42 | 40 | |
| Calculating Noise as a Point Source in Free Space (Q = 1) | ||||||
Data for Energy Labeling Purposes
| Brand | THE IDEAL CLIMATE | THE IDEAL CLIMATE | THE IDEAL CLIMATE | THE IDEAL CLIMATE | |
| Model | VRKS27W | VRKS52W | VRKS60W | VRKS00W | |
| Specific Energy Consumption (SEC) | kWh/m²/year | Cold -82.7 Temperate zone -40.8 Hot -16.8 |
Cold -85.1 Temperate zone -42.2 Hot -16.6 |
Cold -84.3 Temperate zone -41.8 Hot -17.5 |
Cold -84.9 Temperate zone -41.4 Hot -16.5 |
| Type of Ventilation System | Two-way | Two-way | Two-way | Two-way | |
| Type of Installed Drive | How many speeds? | How many speeds? | How many speeds? | How many speeds? | |
| Type of Heat Recovery System | Recovery | Recovery | Recovery | Recovery | |
| Efficiency Δt at 13°C | % | 75% | 80% | 78% | 83% |
| Maximum capacity | m³/h | 25 | 50 | 60 | 100 |
| Absorbed electrical energy | 3.35 | 4.3 | 5 | 10.5 | |
| Maximum sound level | dB(A) | 42 | 40 | 42 | 44 |
| Reference flow rate | m³/s | 0,0047 | 0,0097 | 0,0117 | 0,0195 |
| Difference in reference pressure | Pa | 0 | 0 | 0 | 0 |
| Specific Input Power (SPI) | W/(m³/h) | 0,15 | 0,13 | 0,13 | 0,15 |
| Type of inspection | Local Environmental Monitoring | Local Environmental Monitoring | Local Environmental Monitoring | Local Environmental Monitoring | |
| Maximum internal leakage | % | 1,5% | 1,5% | 1,5% | 1,5% |
| Maximum external leakage | % | 0% | 0% | 0% | 0% |
| Mixing speed of bidirectional units | % | 1% | 1% | 1% | 1% |
| Airflow sensitivity at ±20 Pa | m³/h | 0,41 | 0,55 | 0,55 | 0,55 |
| Internal/External Air Tightness | m³/h | 0,49 | 0,6 | 0,6 | 0,6 |
| Web address | www.idealclima.eu | www.idealclima.eu | www.idealclima.eu | www.idealclima.eu | |
| Annual Electricity Consumption (AEC) | kWh of electricity/year | 1.22 | 1.06 | 1.06 | 0,15 |
| Annual Heating Savings (AHS) | kWh of primary energy per square meter per year | Cold 85.7 Temperate 43.8 Hot 19.8 |
Cold 87.8 Temperate 44.9 Hot 20 |
Cold 87.8 Temperate 44.4 Hot 19.9 |
Cold 86.1 Temperate 44.4 Hot 19.9 |
