The ecoTEC classic is the basic HR boiler in the Vaillant range. This device combines German quality with efficiency, providing the basic comfort for your home. The ecoTEC classic VHR 23-28/5-3 comes with an integrated expansion vessel, 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 seasons. This modulation range ensures even heating and helps save 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 utilize 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:
Management or remote control is possible with the optional sensoNET gateway in combination with the sensoAPP.
Technical Specifications
| Feature | Value |
|---|---|
| Brand | Vaillant |
| Supplier Code | 0010025035 |
| EAN Code | 4024074850268 |
| Discount Group | 016 |
| Width | 440 mm |
| Height | 720 mm |
| Depth | 335 mm |
| Supply Voltage | 230 V |
| Number of Phases | 1 |
| Material Quality | Other |
| Flow Connection | Compression fitting |
| Return Connection | Compression fitting |
| Nominal Voltage | 190 - 253 V |
| Frequency | 50 Hz |
| Closed Construction | Yes |
| Nominal Hot Water Output | 34 kW |
| Nominal Upper Hot Water Load | 32.1 kW |
| Nominal Lower Hot Water Load | 28.9 kW |
| Water Heating Energy Efficiency (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 Heating | A |
| Energy Efficiency Class Water Heating | A |
| Nominal Diameter Hot Water | 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 |
| With Integrated Economizer | No |
| Energy Efficiency Heating | 94% |
| Max. Hydrogen Percentage in Natural Gas Mix | 0% |
| Suitable for Low Calorific Gas | Standard factory setting |
| Suitable for High Calorific 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 Heating (811/2013/EU) | A |
| Energy Efficiency Class 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 Heating) | 92% |
| Heat Exchanger Material | Stainless Steel (SS) |
| Heating Power Adjustable | Yes |
| Nominal Diameter Cold Water | 1/2" (15) |
| Activation Threshold | 1.5 l/min |
| Built-in Pump Switch | Yes |
| Gas Certification VR/SV | Yes |
| Gas Certification NZ | Yes |
| CW Label | 4 |
| Nominal Lower Load | 24.5 kW |
| Nominal Upper Load | 27.2 kW |
| 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-dependent Regulator | No |
| Built-in Expansion Vessel | Yes |
| Nominal Power 80-60°C | 24 kW |
| Max. Flow Temperature (Operating Temperature) | 85°C |
| Built-in Fill/Drain Valve | No |
| Built-in Pressure Relief Valve | No |
| External Pipe Diameter Flow | 22 mm |
| External Pipe Diameter Return | 22 mm |
| Fuel Connection | Compression fitting |
| External Pipe Diameter Fuel | 15 mm |
| Air Intake Connection | Socket |
| Nominal Channel Diameter Air Intake | 80 mm |
| Flue Gas Outlet 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 Supply Pressure | 20 mbar |
| Suitable for Natural Gas | Yes |
| Gas Certification VR | No |
| Cold Water Connection | Compression fitting |
| Hot Water Connection | Compression fitting |
| Nominal Channel Diameter Flue Gas Outlet | 80 mm |
| Burner Control High/Low | No |
| Burner Control Modulating | Yes |
| Built-in Manometer | Yes |
| 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 |
| Control Signal OpenTherm | No |
| Operation as Open Version (Air Intake) | Yes |
| Nominal Power 50-30°C | 25.7 kW |
| Suitable for Propane | Yes |
| Suitable for Butane | No |
| Suitable for Methane | Yes |
| Max. 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 |
| Expansion Connection | Other |
| CW Label | 4 |
| Gas Certification HR | Yes |
| Gas Certification NZ | Yes |
