The Vaillant ecoFIT pro is a compact range of combination HR boilers equipped with a robust aluminum heat exchanger. This ecoFIT pro VUW 256/6-3 (L-NL) is fitted with a CW3 class and delivers 10 liters of hot water (40°C) per minute.
Advanced Heat Exchanger
The heat exchanger is made from a self-protecting, sand-cast aluminum alloy, minimizing corrosion and contamination. The heat exchanger is quick to open and can be easily cleaned with water, without the use of brushes. A smart design ensures error-free gasket assembly and a perfect seal without the use of 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 the anchorage in the fiberglass-reinforced base plate. The safety siphon is directly visually inspectable, can be easily disassembled for cleaning, and does not need to be filled due to the unique closure mechanism.
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 exchanged during maintenance.
Available Thermostats
For the Vaillant ecoTEC plus, the following thermostats are compatible:
Technical Specifications
| Feature | Value |
|---|---|
| Brand | Vaillant |
| Supplier Code | 0010029556 |
| EAN Code | 4024074874110 |
| Discount Group | 016 |
| Width | 390 mm |
| Height | 700 mm |
| Depth | 280 mm |
| Power Supply | 230 V |
| Number of Phases | 1 |
| Material Quality | Other |
| Inlet Connection | Compression |
| Return Connection | Compression |
| Nominal Voltage | 230 - 230 V |
| Frequency | 50 Hz |
| Closed Design | Yes |
| Nominal Hot Water Output | 25.2 kW |
| Nominal Hot Water Upper Limit Load | 28.6 kW |
| Nominal Hot Water Lower Limit Load | 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 Hot Water Diameter | 1/2" (15) |
| Additional Power Consumption at Full Load (ELmax) | 0.025 kW |
| Useful Heat Output at Nominal Heat Output and Operation at High Temperature (P4) | 18.2 kW |
| Useful Efficiency at Nominal Heat Output and Operation at High Temperature (n4) | 89% |
| Additional Power Consumption in Standby Mode (Psb) | 0.002 kW |
| Standby Heat Loss (Pstby) | 0.05 kW |
| With Built-in Economizer | No |
| Space Heating Energy Efficiency | 94% |
| Max. Hydrogen Mixing Percentage 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 Inlet Pressure | 17 - 30 mbar |
| Nominal Load for Hot Water | 5.7 - 28.6 kW |
| ηs, h (Seasonal Energy Efficiency for Space Heating) | 94% |
| Heat Exchanger Material | Aluminum |
| Adjustable Heating Capacity | Yes |
| Nominal Cold Water Diameter | 1/2" (15) |
| Minimum Flow Rate | 1.5 l/min |
| Built-in Pump Switch | Yes |
| Gas Certification VR/SV | No |
| Gas Certification NZ | Yes |
| CW Label | 3 |
| Nominal Lower Limit Load | 18.4 kW |
| Nominal Upper Limit Load | 20.4 kW |
| Min. Operating Pressure | 0.8 bar |
| Min. Return Temperature | 1 °C |
| Max. Gas Inlet Pressure | 30 mbar |
| Hot Water Capacity at 60°C | 6 l/min |
| Built-in Weather Regulator | No |
| Built-in Expansion Vessel | No |
| Hydraulic Resistance at ΔT 20°C | 25 kPa |
| Nominal Output 80-60°C | 18.1 kW |
| Max. Supply Temperature (Operating Temperature) | 83°C |
| Max. Operating Pressure | 3 bar |
| Built-in Fill/Drain Valve | No |
| Built-in Pressure Relief Valve | No |
| External Pipe Diameter Supply | 22 mm |
| External Pipe Diameter Return | 22 mm |
| Fuel Connection | Compression |
| External Pipe Diameter Fuel | 15 mm |
| Air Supply Connection | Socket |
| Nominal Air Supply Channel Diameter | 80 mm |
| Flue Gas Connection | Socket |
| External Pipe Diameter Cold Water | 15 mm |
| External Pipe Diameter Hot Water | 15 mm |
| Condensate Connection | Flexible |
| External Pipe Diameter Condensate | 25 mm |
| Min. Gas Inlet Pressure | 20 mbar |
| Suitable for Natural Gas | Yes |
| Gas Certification VR | No |
| Cold Water Inlet Connection | Compression |
| Hot Water Inlet Connection | Compression |
| Nominal Flue Gas Pipe Diameter | 80 mm |
| Burner Control High/Low | No |
| Burner Control Modulating | Yes |
| Built-in Manometer | No |
| Gas Certification HR | Yes |
| Efficiency | 107% |
| Pilot Flame | No |
| Second Return Connection | No |
| Control Signal On/Off | Yes |
| Control Signal High/Low | No |
| Control Signal 0-10V | No |
| Open Operation Possible (Air Supply) | 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 Inlet Diameter | 3/4" (20) |
| Nominal Return Diameter | 3/4" (20) |
| Nominal Fuel Diameter | 1/2" (15) |
| Hot Water Storage | 1 l |
| Nominal Condensate Diameter | 1" (25) |
| Operating Pressure | 0.3 - 3 bar |
| Built-in Inlet Combination | No |
| CW Label | 3 |
| Gas Certification HR | Yes |
| Gas Certification NZ | Yes |
