The Vaillant ecoFIT pro is a compact series of combi gas boilers equipped with a robust aluminum heat exchanger. This ecoFIT pro VUW 256/6-3 (L-NL) is classified as CW3, has a built-in expansion vessel, and delivers 10 liters of hot water (40°C) per minute.
Advanced Heat Exchanger
The heat exchanger is made of a self-protecting, sand-cast aluminum alloy that minimizes corrosion and contamination. It is easy to open and can be cleaned with water without using brushes. A clever design ensures flawless gasket installation and a perfect seal without the need for a torque wrench.
High-Quality Components
The ecoFIT pro is equipped with high-quality components. The hydroblock has passed durability tests with pressures up to 30 bar. Torsional forces during assembly are prevented by anchoring in the fiberglass-reinforced base plate. The safety siphon is visually inspectable, easily removable for cleaning, and thanks to its unique closure mechanism, it does not need to be filled.
Easy Installation
The ecoFIT pro has a very compact size (suitable for kitchen installation), making it easy to place. All components are accessible from the front and can be easily replaced during maintenance.
Available Thermostats
The following thermostats are compatible with the Vaillant ecoTEC plus:
Technical Specifications
| Feature | Value |
|---|---|
| Brand | Vaillant |
| Supplier Code | 0010029559 |
| EAN Code | 4024074874141 |
| Discount Group | 016 |
| Width | 390 mm |
| Height | 700 mm |
| Depth | 280 mm |
| Power Supply | 230 V |
| Number of Phases | 1 |
| Material Quality | Other |
| Supply Connection | Compression |
| Return Connection | Compression |
| Nominal Voltage | 230 V |
| Frequency | 50 Hz |
| Closed Design | Yes |
| Nominal Hot Water Power | 25.2 kW |
| Nominal Load Upper Value Hot Water | 28.6 kW |
| Nominal Load Lower Value Hot Water | 25.7 kW |
| Energy Efficiency of Water Heating (Nwh) | 86% |
| SEER (Ns) under average conditions | 94 |
| SEER (Ns) under colder conditions | 98.9 |
| SEER (Ns) under warmer conditions | 89 |
| Capacity Profile | XL |
| Energy Efficiency Class for Space Heating | A |
| Energy Efficiency Class for Water Heating | A |
| Nominal Diameter for Hot Water | 1/2" (15) |
| Additional Electricity Consumption at Full Load (ELmax) | 0.025 kW |
| Useful Heat Output at Nominal Heat Output and High-Temperature Operation (P4) | 18.2 kW |
| Useful Efficiency at Nominal Heat Output and High-Temperature Operation (n4) | 89% |
| Additional Electricity Consumption in Standby Mode (Psb) | 0.002 kW |
| Standby Heat Loss (Pstby) | 0.05 kW |
| With Built-in Economizer | No |
| Energy Efficiency Space Heating | 94% |
| Maximum Hydrogen Percentage in Mixture with NAT Gas | 0% |
| Suitable for Low Calorific Value Natural Gas | Standard Factory Setting |
| Suitable for High Calorific Value Natural Gas | Manually Adjustable |
| Suitable for Propane | Not Suitable |
| Suitable for Butane | Not Suitable |
| Suitable for Methane | Not Suitable |
| Suitable for LPG | Not Suitable |
| Suitable for Hydrogen | Not Suitable |
| Energy Efficiency Class for Space Heating (811/2013/EU) | A |
| Energy Efficiency Class for Water Heating (811/2013/EU) | A |
| Nominal Load | 5.7 - 20.4 kW |
| Gas Supply Pressure | 17 - 30 mbar |
| Nominal Hot Water Load | 5.7 - 28.6 kW |
| ηs, h (Seasonal Energy Efficiency for Space Heating) | 94% |
| Heat Exchanger Material | Aluminum |
| Adjustable Heating Capacity | Yes |
| Nominal Diameter for Cold Water | 1/2" (15) |
| Flow Threshold | 1.5 l/min |
| Built-in Pump Switching | Yes |
| Gas Certification VR/SV | No |
| Gas Certification NZ | Yes |
| CW Label | 3 |
| Nominal Load Lower Value | 18.4 kW |
| Nominal Load Upper Value | 20.4 kW |
| Min. Operating Pressure | 0.8 bar |
| Min. Return Temperature | 1°C |
| Max. Gas Supply Pressure | 30 mbar |
| Hot Water Capacity at 60°C | 6 l/min |
| With Built-in Weather-Dependent Control | No |
| Built-in Expansion Vessel | Yes |
| Hydraulic Resistance at ΔT 20°C | 25 kPa |
| Nominal Output 80-60°C | 18.1 kW |
| Max. Flow Temperature (Operating Temperature) | 83°C |
| Max. Operating Pressure | 3 bar |
| With Built-in Fill/Drain Valve | No |
| Built-in Pressure Relief Valve | Yes |
| External Pipe Diameter for Supply | 22 mm |
| External Pipe Diameter for Return | 22 mm |
| Fuel Connection | Compression |
| External Pipe Diameter for Fuel | 15 mm |
| Air Supply Connection | Socket |
| Nominal Channel Diameter for Air Supply | 80 mm |
| Flue Gas Outlet Connection | Socket |
| External Pipe Diameter for Cold Water | 15 mm |
| External Pipe Diameter for Hot Water | 15 mm |
| Condensate Connection | Flexible |
| External Pipe Diameter for Condensate | 25 mm |
| Min. Gas Supply Pressure | 20 mbar |
| Suitable for Natural Gas | Yes |
| Gas Certification VR | No |
| Cold Water Connection | Compression |
| Hot Water Connection | Compression |
| Nominal Channel Diameter for Flue Gas Outlet | 80 mm |
| Burner Control High/Low | No |
| Modulating Burner Control | Yes |
| Built-in Manometer | No |
| Gas Certification HR | Yes |
| Efficiency | 107% |
| Pilot Flame | No |
| Second Return Connection | No |
| On/Off Control Signal | Yes |
| High/Low Control Signal | No |
| 0-10V Control Signal | No |
| OpenTherm Control Signal | No |
| Operation as Open Version (Air Supply) Possible | Yes |
| Nominal Output 50-30°C | 19.1 kW |
| Suitable for Propane | No |
| Suitable for Butane | No |
| Suitable for Methane | No |
| Max. Allowable Operating Pressure | 3 bar |
| Nominal Diameter for Supply | 3/4" (20) |
| Nominal Diameter for Return | 3/4" (20) |
| Nominal Diameter for Fuel | 1/2" (15) |
| Hot Water Stock | 1 l |
| Nominal Diameter for Condensate | 1" (25) |
| Operating Pressure | 0.3 - 3 bar |
| With Built-in Inlet Combination | No |
| Expansion Connection | Other |
| CW Label | 3 |
| Gas Certification HR | Yes |
| Gas Certification NZ | Yes |
