Indoor Climate Heat Pump FLEXIT EcoNordic WH4
EcoNordic WH4 by Flexit: The ultimate all-in-one solution for ventilation, heating, and hot water. With advanced heat recovery, smart home compatibility via Modbus, F7 categhory filters, and eco-friendly CO₂ refrigerant, it ensures energy efficiency, comfort, and sustainability for modern homes.
Flexit
Flexit is an international company with over 50 years of experience, specializing in energy-efficient ventilation and air handling solutions for improving indoor air quality in residential and commercial buildings.
SKU :
800501A revolutionary solution for your home
Ventilation that ensures fresh and healthy indoor air all year round. Heating designed for ultimate comfort and efficiency, even in extreme climates. Hot water production integrated seamlessly into a compact, all-in-one system.

Integrated 3-in-1 system
Combines balanced ventilation, efficient heating, and hot water production into one compact solution, saving space and simplifying installation.

Eco-Friendly & efficient
Utilizes natural CO₂ refrigerant and an advanced rotary heat exchanger, delivering high energy savings while minimizing environmental impact.
Smart Home compatible
Easily integrates with intelligent home systems via Modbus, allowing centralized control and monitoring for added convenience and automation.
Heat Recovery Unit with Heat Pump EcoNordic WH4 by Flexit
The EcoNordic WH4 by Flexit is an innovative solution for modern homes, combining ventilation, heating, and hot water production into a single compact system. This unit is ideal for households focused on energy efficiency, environmental sustainability, and comfort.
Key Features of EcoNordic WH4:
- Integrated 3-in-1 System
- Combines balanced ventilation with heat recovery, a heat pump, and a hot water storage tank.
- Space-saving and easy installation – all components are contained in a single unit, eliminating the need for an external outdoor unit.
- Eco-Friendly CO₂ Refrigerant
- Utilizes natural CO₂ refrigerant with zero global warming potential (GWP 1).
- An excellent choice for households prioritizing environmental sustainability.
- High Performance in Nordic Conditions
- Designed for reliable operation in extreme climates.
- Provides heating and hot water up to 65°C and functions efficiently in outdoor temperatures as low as -25°C.
- Advanced Heat Recovery
- The rotary heat exchanger efficiently recovers heat from exhaust air, reducing energy loss and improving overall system efficiency.
- Smart Integration with Intelligent Home Systems
- The unit can be connected to smart home systems via Modbus, allowing seamless integration with other smart devices.
- This feature enables centralized control and monitoring, enhancing the convenience of home automation.
- Smart Control with Flexit GO
- Control the unit remotely via the Flexit GO mobile app.
- Features include temperature settings, ventilation modes, and access to cloud-based services, including system history and remote support.
- Compact and Stylish Design
- Sleek housing integrates all functionalities, eliminating the need for visible ducts or additional technical components.
- A perfect design for modern home interiors.
- Energy Efficiency and Cost Savings
- High efficiency reduces heating and hot water costs, offering a quick return on investment.
- Modular Construction
- Designed with modular components for easy handling and installation.
- All parts are dimensioned to fit through standard doors, ensuring straightforward placement in technical rooms or closets.
Optimal Maintenance
To maintain high air quality, regular filter replacement is essential.
F7-grade filters for the EcoNordic WH4 are available at www.nestfilter.eu
The EcoNordic WH4 is the perfect solution for households seeking an efficient and environmentally friendly way to ensure high indoor air quality while emphasizing energy savings and sustainability. Its compatibility with smart home systems adds an extra layer of convenience, making it an excellent choice for modern living.
Parameter | Value |
---|---|
Rated voltage | 230 V |
Fuse size | 3x25 A (3x16 A) |
Nominal current | 22.3 A (14.8 A) |
Max airflow | 370 m³/h @ 100 Pa |
SFP range (1.5) | 110 - 319 m³/h @ 100 Pa |
Hot water profile (EN 16147) | XL |
COP hot water (EN 16147) | 3.21 |
Compressor output | Up to 4 kW |
Thermal efficiency | > 90% |
SCOP (EN 14825) | 3.22 |
Water heater volume | 197.0 liters |
Nominal operating pressure | 0.45/4.5 MPa/bar |
Max operating pressure (hot water) | 0.7/7 MPa/bar |
Water temperature | 5–65 °C (Legionella: 75 °C) |
Clearance from combustible surfaces | No specific requirements |
Continuous flow heater capacity | 3 kW (1 kW) |
Total nominal power | 6.4 kW (4.4 kW) |
IP code | IP21 |
Sound power level | 52.0 dB(A) |
Fan type | B-wheel |
Automation | Flexit GO |
Filter class, supply air | ePM1 55% (F7) |
Filter class, exhaust air | ePM1 55% (F7) |
Filter type | Compact filter |
Filter dimensions (WxHxD) | 242 x 270 x 95 mm |
Refrigerant | CO₂ (0.5 kg) |
GWP (Global Warming Potential) | 1 |
Heat pump pipe connection | 200 mm |
Max operating pressure (heat pump) | 14/140 MPa/bar |
Minimum outdoor temperature | -25 °C |
Inverter regulation | Yes |
Placement | Technical room/cabinet |
Ambient operating temperature | 3 - None °C |
Width | 1198 mm |
Height | 1900 mm |
Depth | 650 mm |
Weight | 238.0 kg |
Pipe connection (Ø) | 160 mm |
Module weights | - Tank module: 71 kg (65 kg without doors) |
- Ventilation module: 84 kg (76 kg without doors) | |
- Heat pump module: 71 kg (65 kg without doors) | |
- Installation module: 12.0 kg |
Brand | Flexit |
Max. air flow m³/h | 370 m3/h @ 100 Pa |