The ecoTEC classic is the entry-level model in Vaillant’s range. This unit combines German quality with energy efficiency, providing essential comfort for your home. The ecoTEC classic VHR 23-28/5-3 belongs to CW4 class and delivers 13.4 liters of hot water (40°C) per minute.
The ecoTEC classic carries an A energy label for both heating and hot water. The modulation range is 1:4, allowing the partial load to adjust automatically based on seasonal conditions. This ensures even heating while optimizing gas consumption.
The ecoTEC classic is hybrid-ready, meaning it can be expanded with a heat pump. This allows you to utilize renewable energy sources, making heating more efficient than ever. You save on energy costs while heating your home sustainably.
The following thermostats are compatible with the Vaillant ecoTEC classic:
Remote control is possible with the optional sensoNET gateway in combination with the sensoAPP.
| Feature | Value |
|---|---|
| Brand | Vaillant |
| Model Number | 0010025033 |
| EAN Code | 4024074850244 |
| Dimensions (WxHxD) | 440 x 720 x 335 mm |
| Power Supply | 230 V |
| Number of Phases | 1 |
| Flow/Return Connection | Compression |
| Nominal Voltage | 190 - 253 V |
| Frequency | 50 Hz |
| Closed System | Yes |
| Nominal Hot Water Power | 28.1 kW |
| Nominal Hot Water Load (Higher Heating Value) | 32.1 kW |
| Nominal Hot Water Load (Lower Heating Value) | 28.9 kW |
| Water Heating Efficiency (Nwh) | 87% |
| SEER (average conditions) | 92 |
| SEER (cold conditions) | 97.2 |
| SEER (warm conditions) | 87.8 |
| Capacity Profile | XL |
| Space Heating Efficiency Class | A |
| Water Heating Efficiency Class | A |
| Nominal Hot Water Pipe Diameter | 1/2" (15 mm) |
| Max. Electrical Consumption (ELmax) | 0.04 kW |
| Nominal Heat Output (P4) | 23.9 kW |
| Efficiency at High Temperature (n4) | 87.8% |
| Standby Power Consumption (Psb) | 0 kW |
| Standby Heat Loss (Pstby) | 0.06 kW |
| Space Heating Efficiency | 94% |
| Max. Hydrogen Mixing with Natural Gas | 0% |
| Suitable for Low-Calorific Natural Gas | Factory Setting |
| Suitable for High-Calorific Natural Gas | Manually Adjustable |
| Suitable for Propane | With conversion kit (not included) |
| Suitable for Butane, Methane, LPG, Hydrogen | Not suitable |
| Nominal Load | 7.3 - 27.2 kW |
| Gas Supply Pressure | 17 - 30 mbar |
| Nominal Hot Water Load | 7.3 - 31.1 kW |
| ηs, h (Seasonal Efficiency for Space Heating) | 92% |
| Heat Exchanger Material | Stainless Steel (RVS) |
| Adjustable Heating Power | Yes |
| Nominal Cold Water Pipe Diameter | 1/2" (15 mm) |
| Minimum Flow Rate | 1.5 l/min |
| Built-in Pump Control | Yes |
| Gaskeur Certifications | VR/SV, NZ, HR |
| CW Class | 4 |
| Min. Operating Pressure | 0.3 bar |
| Min. Return Temperature | 1°C |
| Max. Gas Supply Pressure | 30 mbar |
| Hot Water Capacity at 60°C | 8 l/min |
| Built-in Weather Compensation | No |
| Built-in Expansion Vessel | No |
| Nominal Power (80-60°C) | 24 kW |
| Max. Flow Temperature | 85°C |
| Max. Operating Pressure | 3 bar |
| Built-in Fill/Drain Valve | No |
| Built-in Safety Valve | No |
| Fuel Connection | Compression |
| Fuel Pipe Diameter | 15 mm |
| Air Supply Connection | Socket |
| Nominal Air Supply Pipe Diameter | 80 mm |
| Flue Gas Connection | Socket |
| Cold/Hot Water Pipe Diameter | 15 mm |
| Condensate Drain Connection | Flexible |
| Condensate Drain Diameter | 25 mm |
| Min. Gas Supply Pressure | 20 mbar |
| Suitable for Natural Gas | Yes |
| Suitable for Propane | Yes |
| Suitable for Methane | Yes |
| Max. Allowable Operating Pressure | 3 bar |
| Nominal Flow/Return Pipe Diameter | 3/4" (20 mm) |
| Nominal Condensate Diameter | DN 20 |
| Conversion Kit Required | Yes |
| Operating Pressure Range | 0.3 - 3 bar |
| Built-in Safety Group | No |
| Burner Control (High/Low) | No |
| Burner Control (Modulating) | Yes |
| Built-in Manometer | Yes |
| Efficiency | 107% |
| Pilot Flame | No |
| Secondary Return Connection | No |
| Control Signal (On/Off) | Yes |
| Control Signal (High/Low, 0-10V, OpenTherm) | No |
| Open Air Supply Operation Possible | Yes |
| Nominal Power (50-30°C) | 25.7 kW |
