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The ecoTEC classic is the basic HR boiler in the Vaillant range. This unit combines German quality with energy efficiency, providing the essential comfort for your home. The ecoTEC classic VHR 23-28/5-3 has a CW4 class and delivers 13.4 liters of hot water (40°C) per minute.
Energy Efficient
The ecoTEC classic carries the energy label A for both heating and hot water. The modulation range is 1:4. The partial load can be automatically adjusted and adapts throughout the year to the changing seasons. This modulation range ensures even heating, thereby saving on gas consumption.
Future-Proof
The ecoTEC classic is hybrid-ready; the heating system can be expanded with a heat pump. This allows you to use renewable energy sources and heat more efficiently than ever before. Additionally, you save on energy costs and heat your home in a sustainable way.
Available Thermostats
The following thermostats are compatible with the Vaillant ecoTEC plus:
Control or remote management is possible with the optional sensoNET gateway in combination with the sensoAPP.
Technical Specifications:
| Feature | Value |
|---|---|
| Brand | Vaillant |
| Supplier Code | 0010025033 |
| EAN Code | 4024074850244 |
| Width | 440 mm |
| Height | 720 mm |
| Depth | 335 mm |
| Power Supply | 230 V |
| Number of Phases | 1 |
| Flow Connection | Compression fitting |
| Return Connection | Compression fitting |
| Nominal Voltage | 190 - 253 |
| Frequency | 50 Hz |
| Closed Construction | Yes |
| Nominal Hot Water Power | 28.1 kW |
| Nominal Hot Water Upper Load | 32.1 kW |
| Nominal Hot Water Lower Load | 28.9 kW |
| Energy Efficiency of Water Heating (Nwh) | 87 % |
| SEER (Ns) in average conditions | 92 |
| SEER (Ns) in colder conditions | 97.2 |
| SEER (Ns) in warmer conditions | 87.8 |
| Capacity Profile | XL |
| Energy Efficiency Class for Space Heating | A |
| Energy Efficiency Class for Water Heating | A |
| Nominal Diameter of Hot Water Connection | 1/2" (15) |
| Additional Power Consumption at Full Load (ELmax) | 0.04 kW |
| Useful Heat Output at Nominal Heat Output and Operation at High Temperature (P4) | 23.9 kW |
| Useful Efficiency at Nominal Heat Output and Operation at High Temperature (n4) | 87.8 % |
| Additional Power Consumption in Standby Mode (Psb) | 0 kW |
| Standby Heat Loss (Pstby) | 0.06 kW |
| Built-in Economizer | No |
| Energy Efficiency for Space Heating | 94 % |
| Max. Hydrogen Percentage from Mixing with NAT Gas | 0 % |
| Suitable for Low Calorific Natural Gas | Standard factory setting |
| Suitable for High Calorific Natural Gas | Manually adjustable |
| Suitable for Propane | With conversion kit, not included |
| 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 | 7.3 - 27.2 kW |
| Gas Supply Pressure | 17 - 30 mbar |
| Nominal Load Hot Water | 7.3 - 31.1 kW |
| ηs, h (Seasonal Energy Efficiency for Space Heating) | 92 % |
| Heat Exchanger Material | Stainless Steel (RVS) |
| Adjustable Heating Power | Yes |
| Nominal Diameter of Cold Water Connection | 1/2" (15) |
| Tap Threshold | 1.5 l/min |
| Built-in Pump Switching | Yes |
| Gas Certificate VR/SV | Yes |
| Gas Certificate NZ | Yes |
| CW Label | 4 |
| Nominal Load Lower Value | 24.5 kW |
| Nominal Load Upper Value | 27.2 kW |
| Minimum Operating Pressure | 0.3 bar |
| Minimum Return Temperature | 1 °C |
| Maximum Gas Supply Pressure | 30 mbar |
| Hot Water Capacity at 60°C | 8 l/min |
| Built-in Weather Dependent Regulator | No |
| Built-in Expansion Tank | No |
| Nominal Power 80-60°C | 24 kW |
| Maximum Flow Temperature (Operating Temperature) | 85 °C |
| Maximum Operating Pressure | 3 bar |
| Built-in Fill/Drain Valve | No |
| Built-in Overpressure Valve | No |
| External Pipe Diameter Flow | 22 mm |
| External Pipe Diameter Return | 22 mm |
| Fuel Connection | Compression fitting |
| External Pipe Diameter Fuel Connection | 15 mm |
| Air Supply Connection | Socket |
| Nominal Diameter Air Supply Pipe | 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 |
| Minimum Gas Supply Pressure | 20 mbar |
| Suitable for Natural Gas | Yes |
| Gas Certificate VR | No |
| Cold Water Connection | Compression fitting |
| Hot Water Connection | Compression fitting |
| Nominal Diameter Flue Gas Pipe | 80 mm |
| Burner Control High/Low | No |
| Burner Control Modulating | Yes |
| Built-in Manometer | Yes |
| Gas Certificate 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 |
| Control Signal OpenTherm | No |
| Operation as Open Version (Air Supply) | Yes |
| Nominal Power 50-30°C | 25.7 kW |
| Suitable for Propane | Yes |
| Suitable for Butane | No |
| Suitable for Methane | Yes |
| Maximum Allowable Operating Pressure | 3 bar |
| Nominal Diameter Flow | 3/4" (20) |
| Nominal Diameter Return | 3/4" (20) |
| Nominal Diameter Fuel | 1/2" (15) |
| Hot Water Stock | 1 l |
| Nominal Diameter Condensate | DN 20 |
| Conversion Kit Required | Yes |
| Operating Pressure | 0.3 - 3 bar |
| Built-in Inlet Combination | No |
| CW Label | 4 |
| Gas Certificate HR | Yes |
| Gas Certificate NZ | Yes |
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