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auroTHERM plus VFK 155 (discontinued)

High efficiency solar thermal flat plate collectors

  • Standardised roof bracket system
  • Push fit hydraulic connections
  • Anti-reflective solar glass 3.2mm with 96% solar transmission
  • Suitable for high operating temperatures


High efficiency flat plate collectors

Attention: This product is now discontinued, so if you are looking for a new solar thermal product, please see the auroTHERM VFK 145

Virtually every Vaillant solar domestic hot water system starts with roof-mounted collectors that heat solar liquid. Our collector range encompasses three types of collectors including flat plate options to cover all installations situations, locations and customer requirements.

The auroTHERM Plus VFK 155 flat plate collectors have toughened 3.2mm solar glass, and a neat panel design which can installed on-roof, in-roof or using flat roof configuration, meaning installation and maintenance of auroTHERM could not be more straightforward.

Features and benefits:

  • Standardised roof bracket system - Brings familiarity to installers when fitting our collectors
  • Push fit hydraulic connections - Does not require any special tool when fitting and reduces installation time
  • MCS accreditation - Manufactured to a high quality and qualifies for various government incentives
  • Ability to offer a complete system solution - Can be used with all Vaillant products in order to offer a full Vaillant solution
  • Black frameless design - Best appearance whilst ensuring maximum use of collector area resulting in high performance and efficiency
  • Frameless design available in both horizontal and vertical collector options
  • Black anodised aluminium collector chassis gives best appearance with maximum performance
  • Anti-reflective solar glass 3.2mm with 96% solar transmission
  • Flexible siting options - Can be fitted on-roof, in-roof or on a flat roof (mounting bracket options available to suit various roof tile types)
  • Highly efficient plate technology - With 40mm rear insulation and low profile collector being only 80mm thick
  • High quality you expect from Vaillant - With aluminium/copper absorber laser precision welded
  • Suitable for high operating temperatures - Enabling maximum energy to be extracted from the sun
  • Collector weighs 38kg and dimension of 1233mm x 2033mm - Helping with ease of installation
  • Supplied as complete solar installation kit - For ease of ordering
  • Various intelligent controls and cylinder options available - A total system solution from one manufacturer



VFH 155 H/V
Absorber typeSerpentine horiz/vert
Dimensions (L x W x H)
Vertical2033 x 1233 x 80 mm
Horizontal1233 x 2033 x 80 mm
Weight38 kg
Volume2.16(H) I
Volume1.85(V) I
max pressure10 bar
Stagnation temperature172 °C
Gross area2,51 m2
Aperture surface area2,35 m2
Absorber surface area2,33 m2
AbsorberAluminium (vacuum coated) 0.5 x 1178 x 1978 mm
CoatingHigh selective (blue)
Glass covering 
Glass typeSolar safey glass (primatic structure)
Back wall insulation40 mm / 0.035 W/m2K / 55 kg/3
Edge insulationAvailable
Efficiency84.2 % (H) / 83.3 % (V)
Heat loss factor (k)3.82(H) W/m2K / 2.33(V) W/m2K
Heat loss factor (k2)0.018(H) W/m2K / 0.049(V) W/m2K


Alternative products

Alternative products

auroTHERM exclusive VTK 570 (discontinued)

  • Standardised roof bracket system
  • Vertical collector available for on-roof and flat roof installations with mounting bracket options
  • Up to six collectors can be connected in a series

auroTHERM VFK 145

  • Stylish, high performance flat plate technology
  • Flexible siting options
  • Various intelligent control and cylinder options available