Solar Flat Plate CollectorauroTHERM classic VFK 135/3
Solar flat plate collector for solar drainback systems.
- Drainback technology for enhanced performance and durability
- Selective absorber and anti-reflective glass for strong solar gains
- Vertical or horizontal mounting for a wide range of applications
- Suitable for single-family and multi-family buildings
auroTHERM classic solar flat‑plate collectors are built for drainback systems. When there is no sunlight or once the hot water has reached the set temperature, the solar fluid drains naturally from the collectors. The result: no risk of freezing, stagnation, or overpressure – so the system lasts longer. At the same time, auroTHERM collectors capture and hold the sun’s free heat efficiently and transfer it to your hot water. You can install them horizontally or vertically, on the roof or integrated into the roof, depending on your home and preference.
Ideal for:
- Heating
- Hot water
Technical data table overline
Technical data table headline
auroTHERM classic | |
VFK 135/3 VD | VFK 135/3 D |
| Collector Minimum Yield | Collector Minimum Yield | 525 kWh/m²a | 525 kWh/m²a |
|---|---|---|---|
| Aperture Collector Surface Area | Aperture Collector Surface Area | 2,35 m² | 2,35 m² |
| Gross Collector Surface Area | Gross Collector Surface Area | 2,51 m² | 2,51 m² |
| Collector Standby Temperature | Collector Standby Temperature | 210 °C | 210 °C |
| Collector Efficiency η₀ | Collector Efficiency η₀ | 73,6 % | 75 % |
| Collector Transmission Figure | Collector Transmission Figure | 91 % | 91 % |
| Collector Absorption Figure | Collector Absorption Figure | 95 % | 95 % |
| Collector Emission Figure | Collector Emission Figure | 5 % | 5 % |
| Collector Heat Transmission Coefficient 1 | Collector Heat Transmission Coefficient 1 | 3,326 W/m²K | 3,493 W/m²K |
| Collector Heat Transmission Coefficient 2 | Collector Heat Transmission Coefficient 2 | 0,0143 W/m²K² | 0,0135 W/m²K² |