Danfoss EvoFlat 4.0 W-FR Domestic Hot Water Station
Description
The Danfoss EvoFlat 4.0 W Flat station is designed for easy installation, maintenance, and use, making it particularly suitable for multi-family buildings connected to central or district heating systems. Its innovative design features a body made from reinforced PPS composite, ensuring a lightweight unit with limited internal heat emission. The smooth surface helps reduce scaling and clogging. All components are fitted with click-fit connections, eliminating the need for retightening, unlike conventional stations with numerous pipes and screw connections.
Domestic Hot Water (DHW) Capabilities:
The EvoFlat 4.0 station is available in four heat exchanger sizes, catering to requirements from 37 kW up to 80 kW. A built-in flow actuator manages primary and secondary side flow through the heat exchanger, activating only when hot water is tapped and blocking the flow immediately after the tapping ends. The intelligent controller considers both flow volume and temperature, acting as a self-adjusting thermostatic flow controller. This ensures accurate and stable water temperatures and optimizes hydronic balance across multiple stations connected to the same heating source. An optional domestic hot water circulation set can be fitted if required.
Features & Benefits:
- Low weight
- Easy to install, maintain, and use
- Durable composite material
- Minimal space required for installation
- High insulation EPP cover
- Prepared for build-in heat meter
- Prepared for build-in water meter
- Compatible with various heat sources, such as district heating or heat pumps
Ordering Information
Product Code Numbers Standard Stations
| Flat station | Brazing (HEX) copper | Brazing (HEX) Stainless steel |
| EvoFlat 4.0 W (HEX size 1) | 183B3012 | |
| EvoFlat 4.0 W (Hex size 2) | 183B3013 | |
| EvoFlat 4.0 W (HEX size 3) | 183B3014 | |
| EvoFlat 4.0 W (HEX size 4) | 183B3014 |
Domestic Hot Water Circulation
If needed, a set with pump and valve can be ordered for easy connection to the flat station.
| Code number | Description |
| 183B0500 | Circulation set EvoFlat SAC |
| 183B0547 | Circulation set EvoFlat SAC insulated |
Accessories
Recess Boxes
The recess box is constructed from galvanized steel with a frame and door powder-coated in RAL9016. Brackets for mounting the flat station and distribution unit are integrated for quick installation. The box is fully enclosed, opening at the bottom with adjustable mounting feet (up to 120 mm height adjustment). A mounting rail with seven ball valves is included separately. It can be installed within a wall or mounted on a wall.
| Code number | Description | Wide | Height | Depth |
| 183U6028 | Recess box w/mounting rail | 610 | 910 | 150 |
| 183U6029 | Recess box w/mounting rail | 690 | 910 | 150 |
| 183U6033* | Feet set for recess box | |||
| 183L5142* | Ball valve set 3/4" 7 connections |
*Spare parts
On Wall Panels for Recess Boxes
| Code number | Description | Wide | High | Depth |
| 183U6012 | On wall panels | 610 | 910 | 150 |
| 183U6014 | On wall panels | 690 | 910 | 150 |
The distribution units can be mounted on the back plate of the recess boxes or directly on the wall. Recess boxes for built-in variants are available in two sizes: Standard station: Recess box W 610 / H 910 / D 150 mm. Station with DHW circulation: Recess box W 690 / H 910 / D 150 mm.
Circuit Diagram
The circuit diagram illustrates the internal layout and connections of the EvoFlat 4.0 W station. Key components include:
- 2: DHW plate heat exchanger
- 4: Differential pressure controller
- 5: Strainer
- 7: Ball valve*
- 9: DHW circulation pump*
- 12: Safety valve*
- 17: Air vent
- 23: Sensor pocket
- 24: Fitting piece for energy meter 3/4" x 110 mm
- 33: Connection for DHW circulation
- 38: Hot water controller
- 40: Summer bypass
- 59: Fitting piece for water meter 3/4" x 110 mm
(*Optional components)
The diagram also shows connection points labeled 1 through 5 for Domestic cold water (DCW) inlet/outlet, Domestic hot water (DHW) supply, and Heating source (DH) supply/return. A physical layout diagram shows numbered connection points and dimensions.
Spare Parts
The EvoFlat 4.0 W station utilizes various spare parts for maintenance and repair. The spare parts are categorized by position (Pos.) and include service kits for heat exchangers (copper and stainless steel), brackets, screws, control valves, thermostats, bypass valves, pipes, bushings, seals, strainers, flow activators, and air vents. Conversion kits are also available for adapting the station's functionality.
| Pos. | Code number | Description |
| 1 | 183B0503 | Service kit type 1 heat exchanger in copper |
| 1 | 183B0504 | Service kit type 2 heat exchanger in copper |
| 1 | 183B0505 | Service kit type 3 heat exchanger in copper |
| 1 | 183B0506 | Service kit type 4 heat exchanger in copper |
| 1 | 183B0507 | Service kit type 1 heat exchanger in stainless steel |
| 1 | 183B0508 | Service kit type 2 heat exchanger in stainless steel |
| 1 | 183B0509 | Service kit type 3 heat exchanger in stainless steel |
| 1 | 183B0510 | Service kit type 4 heat exchanger in stainless steel |
| 2 | 183U2104 | Bracket kit for EvoFlat 4.0 |
| 3 | 145H3819 | Plast screw 15x25 |
| 4 | 183B0511 | DHW control valve set EvoFlat 4.0 |
| 5 | 183B512 | DHW control thermostat set EvoFlat 4.0 |
| 12 | 183B0517 | Bypass valve set thermostatic EvoFlat 4.0 |
| 15 | 183B0516 | Bypass valve set manual EvoFlat 4.0 |
| 16 | 183B0003 | Block for bypass IFS PPS 30GF |
| 17 | 530Z388 | Pipe Ø18 171 mm |
| 18 | 830Z219 | Pipe Ø18 223 mm |
| 19 | 183N5020 | Bushing w/nuts 3/4"x3/4"x32mm |
| 20 | 145H3120 | EPDM shore 3/4" udst. 24x17.5x3mm |
| 21 | 144B2192 | Insert 3/4"x110mm |
| 22 | 830Z207 | Pipe Ø18 77mm |
| 23 | 183B0000 | Washer Ø18.2xØ23.45x2mm |
| 23 | 145.083 | O-ring 17.50x3.50 |
| 24 | 183B0515 | Strainer set EvoFlat 4.0 |
| 25 | 183B0514 | Flow activator with screws and gaskets |
| 26 | 183B0513 | Air vent set Danfoss EvoFlat 4.0 |
| 183B0521 | EPP cover set Danfoss EvoFlat 4.0 | |
| 183B0518 | Plug/O-ring/clips set 2 pc EvoFlat 4.0 | |
| 183B0519 | Clips set 5 pcs./size EvoFlat 4.0 | |
| 183B0520 | Gasket set EvoFlat 4.0 | |
| 183B0533 | Flushing Tool EvoFlat 4.0 HEX | |
| 183B0550 | Conversion kit EvoFlat 4.0 W to M | |
| 183B0551 | Conversion kit EvoFlat 4.0 W to F |
Technical Data
Domestic Hot Water Controller
| Domestic hot water controller | TPC-M |
| Nominal pressure | PN10 |
| Max. supply temperature (DH) | 95 °C |
| DCW static cold water | Pmin = 1.5 bar |
| Brazing (HEX) | Copper or stainless steel |
| Weight excl. cover | 8.7 - 10.4 kg |
| Insulation | EPP λ 0.039 |
| Electrical supply | 230V AC |
| Connection sizes | G 3/4" internal thread |
| Pressure nominal primary | 10 bar |
| Pressure nominal secondary | 10 bar |
| Weight without accessories - Type 1 HEX | 9.9 kg |
| Weight without accessories - Type 2 HEX | 10.3 kg |
| Weight without accessories - Type 3 HEX | 10.7 kg |
| Weight without accessories - Type 4 HEX | 11.6 kg |
DHW Capacity Examples
| Unit type HEX | DHW capacity [kW] | Temperature DHS/DHR [°C] | Flow rate primary [l/h] | Pressure loss Primary* [kPa] | Tap load 50 °C [l/min] |
| Type 1 | 37 | 65/15 | 637 | 25 | 13.3 |
| 43 | 65/16 | 750 | 32 | 15.4 | |
| Type 2 | 45 | 65/15 | 770 | 29 | 16.2 |
| 49 | 65/15 | 844 | 35 | 17.6 | |
| Type 3 | 55 | 65/15 | 943 | 40 | 19.8 |
| 38 | 55/19 | 901 | 37 | 13.7 | |
| Type 4 | 60 | 65/14 | 1014 | 41 | 21.6 |
| 70 | 65/14 | 1197 | 57 | 25.2 | |
| 49 | 55/19 | 1158 | 52 | 17.6 |
*Energy meter not included
Other Technical Data
- Pressure level (tap water side): PN10
- Pressure level (supply side): PN10
- DH network, max. differential pressure: 4 bar
- CW network, min. static pressure: 1.5 bar
- DH network, max. flow temperature: 95 °C
- Nominal connection size: G3/4" (union, 7x)
- Electrical connection: 230V AC
- Dimensions H/W/D: 613/530/150 mm
- Weight: 7.7 kg (Type 1 HEX), 8.1 kg (Type 2 HEX), 8.8 kg (Type 3 HEX), 9.3 kg (Type 4 HEX)
Performance Curves
The following sections detail the performance characteristics of the EvoFlat 4.0 W station for different heat exchanger (HEX) types (Type 1, 2, 3, and 4). These include graphical representations of key operational parameters:
- Pressure Loss Supply Side (Primary Heating Water): Graphs illustrating the pressure loss in kilopascals (kPa) as a function of the flow rate in liters per hour (l/h) for the primary heating water circuit. The maximum flow rate is indicated.
- Pressure Loss Drinking Water Side (Secondary): Graphs showing the pressure loss in kPa against the tapping rate in liters per minute (l/min) for the secondary domestic hot water circuit.
- Flow Rate Supply Side at Different Supply Temperatures: Multiple curves display the domestic hot water flow rate in l/h versus the tapping rate in l/min. These are provided for various primary supply temperatures (e.g., 10-45°C and 10-55°C) and specific DHW heating temperatures (e.g., 48°C, 55°C, 60°C, 65°C).
- Return Temperature Supply Side at Different Supply Temperatures: Multiple curves show the domestic hot water return temperature in °C against the tapping rate in l/min, corresponding to the same ranges of primary supply temperatures and DHW heating temperatures as the flow rate curves.
Water Quality Guidelines
Danfoss provides guidelines for tap water and district heating water quality to ensure optimal performance and longevity of stainless steel plate heat exchangers. The guidelines assess various water parameters against compatibility with different brazing materials (Copper, CoResist, Stainless Steel).
| Parameter | Unit | Value or concentration | Plate AISI 316L W. Nr. 1.4404 | Brazing material Cu | Brazing material CoResist | Brazing material StS |
| pH | < 0.6 | o | - | o | - | |
| 6.0-7.5 | + | o/- | + | + | ||
| 7.5 - 10.5 | + | + | + | + | ||
| > 10.5 | + | o | o | + | ||
| Conductivity | µS/cm | < 10 | + | + | + | + |
| 10 - 500 | + | + | + | + | ||
| 500 - 1000 | + | o | + | + | ||
| > 1000 | + | o | + | + | ||
| Free Chlorine | mg/l | < 0.5 | + | + | + | + |
| 0.5 - 1 | o | + | + | + | ||
| 1 - 5 | o | o | o | + | ||
| > 5 | + | + | + | + | ||
| Ammonia (NH3, NH4+) | mg/l | < 2 | + | + | + | + |
| 2 - 20 | + | o | o | + | ||
| > 20 | + | + | + | + | ||
| Alkalinity (HCO3-) | mg/l | < 60 | + | + | + | + |
| 60 - 300 | + | + | + | + | ||
| > 300 | + | o | + | + | ||
| Sulphate (SO42-) | mg/l | < 100 | + | + | + | + |
| 100 - 300 | + | o/- | o | + | ||
| > 300 | + | + | + | + | ||
| HCO3- / SO42- | mg/l | < 1.5 | + | + | + | + |
| > 1.5 | + | o/- | o | + | ||
| Nitrate (NO3) | mg/l | < 100 | + | + | + | + |
| > 100 | + | o | + | + | ||
| Manganese (Mn) | mg/l | < 0.1 | + | + | + | + |
| > 0.1 | + | o | o | + | ||
| Iron (Fe) | mg/l | < 0.2 | + | + | + | + |
| > 0.2 | + | + | + | + | ||
| * Hardness ratio [Ca2+, Mg2+]/[HCO3-] | 0 - 0.3 | + | + | + | + | |
| 0.3 - 0.5 | + | o/- | + | + | ||
| > 0.5 | + | + | + | + |
Key:
- '+': Good corrosion resistance
- 'o': Corrosion could happen when more parameters are evaluated with 'o'
- 'o/-': Risk of corrosion
- '-': Use is not recommended
*Hardness ratio limits defined per experience and internal tests in Danfoss laboratory. In case of three or more parameters evaluated with 'o', consultancy is needed with Consultant for Corrosion & Microbiology or BU HHE Representative.
Chloride Concentration for Stress Corrosion Cracking Prevention
Recommended Chloride concentration to avoid Stress Corrosion Cracking (SCC) in the stainless-steel plates:
| Application temperature | Chloride concentration |
| at T ≤ 20°C | max 1000 mg/l |
| at T ≤ 50°C | max 400 mg/l |
| at T ≤ 80°C | max 200 mg/l |
| at T ≥ 100°C | max 100 mg/l |
Certificates, Declarations, and Approvals
- CE
- EU RoHS
- EPD
Design and Technical Specifications
The Danfoss EvoFlat™ flat station is engineered for direct heating and hygienic safe hot water provision. It features a control valve operating without auxiliary energy within a continuous flow system, mounted on a heat-insulated base plate with an EPP heat insulation hood for flush or surface mounting.
Domestic Hot Water (DHW) Heating: Tap water is heated via heat exchangers using the continuous flow principle. The tap water temperature is regulated by a self-acting controller, ensuring ease of use. The flow-controlled part enables primary and secondary flow through the heat exchanger only during hot water tapping, blocking flow immediately after. The thermostat part regulates the hot water temperature. The fast-acting control valve minimizes limescale deposits and bacteria growth. The controller, combined with a differential pressure controller, maintains a constant DHW temperature even with varying flow and differential pressures. A thermostatically controlled bypass valve (summer bypass) keeps the primary line warm. A connection for domestic hot water circulation is standard, with the circulation kit available as an option.
Supply-Side Equipment: Includes temperature and pressure regulators, two differential pressure regulators, a zone valve, strainer, and ventilation. Marked as Danfoss. Features a fitting piece for heat meters (G3/4"x110mm) in the return flow and a sensor holder for direct immersion sensors (M10x1mm).
Heat Exchanger: Utilizes a seal-less stainless steel plate heat exchanger, brazed with stainless steel braze under vacuum for a compact unit. The New Micro Plate™™ technology offers enhanced heat transfer, lower pressure losses, and extended service life due to its corrosion-resistant design. Calculations and materials comply with AD data sheets. Manufactured according to DIN ISO 9001 and CE tested per Pressure Equipment Directive 97/23/EC (PED). Marked as Danfoss, Type: XB05H.
Tap-Water-Side Equipment: Includes a fitting piece for cold water meters (G3/4"x110mm) at the CW inlet.
Other Stations in this Portfolio
- EvoFlat 4.0 F: Flat station for domestic hot water and radiator heating.
- EvoFlat 4.0 M: Flat station for domestic hot water and floor heating.
- EvoFlat 4.0 Four pipe: Flat station for domestic hot water and floor heating, specifically designed for heat pumps.
