Solar Flat Plate CollectorauroTHERM VFK 145/4 V/H

Proven solar performance at exceptional value.

Designed for reliable hot water and heating support in solar systems
High solar yields supported by efficient heat transfer
Slim collector design for discreet roof integration
Suitable for horizontal or vertical installation on different roof types
Slim and elegant collector design with durable construction

The auroTHERM pro VFK 125 flat plate collector offers an efficient and accessible way to start using solar energy at home. Designed for pressurised solar thermal systems, it can cover up to 60% of annual domestic hot water demand and support heating with up to 20% additional energy contribution. Its slim and elegant design creates a discreet appearance on the roof, while the anti-reflective structural glass allows around 90% of solar energy to pass through for efficient heat generation. High-quality insulation supports reliable heat transfer, helping the collector achieve an efficiency of up to 70%. For greater flexibility, the collectors can be installed vertically or horizontally to suit different roof layouts and household needs.

Ideal for:

Heating
Hot water

Technical data table overline

Technical data table headline

auroTHERM

VFK 125/4

Solar Collector

Collector Minimum Yield	Collector Minimum Yield	525 kWh/m²a
Aperture Collector Surface Area	Aperture Collector Surface Area	2,35 m²
Gross Collector Surface Area	Gross Collector Surface Area	2,51 m²
Collector Standby Temperature	Collector Standby Temperature	190 °C
Collector Efficiency η₀	Collector Efficiency η₀	70 %
Collector Transmission Figure	Collector Transmission Figure	91 %
Collector Absorption Figure	Collector Absorption Figure	90 %
Collector Emission Figure	Collector Emission Figure	20 %
Collector Heat Transmission Coefficient 1	Collector Heat Transmission Coefficient 1	4,13 W/m²K
Collector Heat Transmission Coefficient 2	Collector Heat Transmission Coefficient 2	0,011 W/m²K²

Operation Fluids

Content Solar Collector	Content Solar Collector	1,85 l

Connections

Connection Dimension Solar (Flow, Return)	Connection Dimension Solar (Flow, Return)	G ¾″
Connection Dimension Solar (Sensor)	Connection Dimension Solar (Sensor)	Ø 6 mm

Dimensions

Height / Width / Depth	Height / Width / Depth	2.033 mm / 1.233 mm / 80 mm
Weight	Weight	36 kg

Limitations

Operating Pressure (max)	Operating Pressure (max)	10 bar
Wind Load (max)	Wind Load (max)	1,6 kN/m²
Snow Load (max, standard)	Snow Load (max, standard)	5,4 kN/m²
On-Roof Installation Angle (min - max)	On-Roof Installation Angle (min - max)	15 - 75°
Flat Roof Installation Angle	Flat Roof Installation Angle	60°