auroTHERM VFK 145

High efficiency solar thermal flat plate collectors

  • Standardised roof bracket system
  • Push fit hydraulic connections
  • Structured solar glass 3.2mm thick with 91% solar transmission
  • Suitable for high operating temperatures


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 VFK 145 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 tools when fitting and reduces installation time
  • MCS accredited - Manufactured to a high quality and qualifies for various government incentives
  • Ability to offer a complete system solution - Can be used with all Vaillant equipment 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
  • Structured solar glass 3.2mm thick with 91% 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 control and cylinder options available - A total system solution from one manufacturer



UnitauroTHERM VFK 145/2 VauroTHERM VFK 145/2 H
Absorber type Serpentine verticalSerpentine horizontal
Dimensions (L x W x H)mm2033 x 1233 x 801233 x 2033 x 80
Maximum pressurebar10 10
Stagnation temperature°C199199
Gross aream22.51 2.51
Aperture surface aream22.35 2.35
Absorber surface aream22.33 2.33
AbsorbermmAluminium (vacuum coated) 0.5 x 1178 x 1978Aluminium (vacuum coated) 0.5 x 1178 x 1978
Coating High selective (blue)High selective (blue)
Glass coveringmm3.2 (thickness) x 1233 x 2033 3.2 (thickness) x 1233 x 2033
Glass type Solar safey glass (primatic structure)Solar safey glass (primatic structure)
Back wall insulation 40 mm / 0.035 W/m2K / 55 kg/3 /40 mm / 0.035 W/m2K / 55 kg/3 /
Edge insulation NoneNone
Efficiency%79.1 80.9
Heat loss factor (k)  2.41 W/m2K3.32 W/m2K
Heat loss factor (k2)  0.049 W/m2K0.023 W/m2K

Related Products

Related Products


  • Mircogeneration Certification Scheme (MCS) accredited
  • Total system available under one article number
  • Suited for commercial properties

auroSTOR cylinders

  • Easy to clean - High quality VG white powder coating
  • Best in class stand by energy losses
  • Inline front connections
  • Adjustable feet meaning the cylinder can be installed on uneven ground


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