Compact Boiler Gas, Condensing, Shift-Load-CylinderecoCOMPACT
Compact floor-standing gas condensing boiler with a shift-load hot water tank.
- Outstanding heating and hot water comfort in a compact package
- Reliable and energy‑saving operation with high modulation
- Lower gas and electricity use
- Shift‑load technology for outstanding hot water comfort
- Quick and easy installation
- Simple control with or without app
- Heating
- Hot water
Compact size
ecoCOMPACT VSC delivers full family heating and exceptional domestic hot water comfort while occupying just 0.41 m² of floor space. Its sleek and modern casing conceals all components, so it even fits neatly in living areas – combining proven Vaillant floor‑standing efficiency with a stylish design.
Always the right outputReliable and energy‑saving operation with high modulation.

Always the right output
With a modulation range from 15% to 100% of nominal output, ecoCOMPACT VSC continuously matches heat demand. This avoids unnecessary gas use, extends steady run times and reduces frequent on-off cycling – further improving efficiency and comfort.
Efficiency that lowers costsLower gas and electricity use.

Efficiency that lowers costs
Self‑optimising condensing technology achieves a high standard efficiency rating, using gas particularly efficiently to help cut energy costs. The high‑efficiency pump automatically reduces its output when heat demand is low, lowering electricity consumption at the same time.
Always readyShift‑load technology for outstanding hot water comfort.

Always ready
ecoCOMPACT VSC’s shift‑load process heats small volumes of water continuously and stores them at the top of the cylinder, gradually spreading downwards. Because the hottest water at 60 °C is always available at the top, you benefit from both a ready reserve for rapid and large withdrawals and effectively unlimited hot water – without depending on the temperature in the entire tank.
Fast setupQuick and easy installation.
Fast setup
The ecoCOMPACT VSCD is designed for fast and straightforward installation: integrated carrying handles, no sharp edges, adjustable feet and a comprehensive standard scope – including a high‑efficiency pump, shift‑load DHW pump and heat exchanger, a 15‑litre heating expansion vessel and an automatic heating circuit deaerator. It also comes with a split mounting concept to separate the unit into two parts for easier transport.
Easy to useSimple control with or without app.

Easy to use
The operation of the ecoCOMPACT VSC is intuitive thanks to its clear control concept. For even more convenience, add the myVAILLANT connect internet module and the multiMATIC 700 system controller to manage the heating via the myVaillant app – from the home or on the go.
Technical data table overline
Technical data table headline
ecoCOMPACT | |||
VSC 206/4 -5 150 | VSC 266/4-5 150 (H) | VSC 266/4 -5 200 | VSC 306/4-5 150 |
| ErP Seasonal Space Heating Efficiency Class | ErP Seasonal Space Heating Efficiency Class | ||||
|---|---|---|---|---|---|
| ErP Water Heating Energy Efficiency Class Of Combination Heater | ErP Water Heating Energy Efficiency Class Of Combination Heater | ||||
| ErP Seasonal Space Heating Energy Efficiency | ErP Seasonal Space Heating Energy Efficiency | 92 % | 92 % | 92 % | 92 % |
| ErP Water Heating Energy Efficiency | ErP Water Heating Energy Efficiency | 84 % | 84 % | 85 % | 85 % |
ecoCOMPACT | |||
VSC 206/4 -5 150 | VSC 266/4-5 150 (H) | VSC 266/4 -5 200 | VSC 306/4-5 150 |
| Heat Output 50/30 °C (G20) (min - max) | Heat Output 50/30 °C (G20) (min - max) | 4,3 - 21,5 kW | 5,9 - 27,1 kW | 5,9 - 27,1 kW | 6,6 - 32,5 kW |
|---|---|---|---|---|---|
| Heat Output 50/30 °C (G31) (min - max) | Heat Output 50/30 °C (G31) (min - max) | 5,6 - 21,5 kW | 6,8 - 27,1 kW | 6,8 - 27,1 kW | 9,5 - 32,5 kW |
| Heat Output 80/60 °C (G20) (min - max) | Heat Output 80/60 °C (G20) (min - max) | 3,8 - 20,0 kW | 5,2 - 25,0 kW | 5,2 - 25,0 kW | 5,8 - 30,0 kW |
| Heat Output 80/60 °C (G31) (min - max) | Heat Output 80/60 °C (G31) (min - max) | 5,0 - 20,0 kW | 6,0 - 25,0 kW | 6,0 - 25,0 kW | 8,5 - 30,0 kW |
| Heat Output (G20) (Domestic Hotwater Mode) (max) | Heat Output (G20) (Domestic Hotwater Mode) (max) | 20,4 kW | - | - | 34 kW |
| Heat Output (G20, G31) (Domestic Hotwater Mode) (max) | Heat Output (G20, G31) (Domestic Hotwater Mode) (max) | - | 30 kW | 30,0 kW | - |
| Heat Output (G31) (Domestic Hotwater Mode) (max) | Heat Output (G31) (Domestic Hotwater Mode) (max) | 20,4 kW | - | - | 34 kW |
| Efficiency (30% acc. to EN 15502) | Efficiency (30% acc. to EN 15502) | 108 % | 108 % | 108 % | 108 % |
| Efficiency (Domestic Hotwater Mode) | Efficiency (Domestic Hotwater Mode) | 98 % | 98 % | 98 % | 98 % |
| Gas Flow Rate, G20 | Gas Flow Rate, G20 | 2,59 m³/h | 3,24 m³/h | 3,24 m³/h | 3,67 m³/h |
| Gas Flow Rate, G31 | Gas Flow Rate, G31 | 1,8 kg/h | 2,38 kg/h | 2,38 kg/h | 2,69 kg/h |