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auroTHERM VFK 145

High efficiency solar thermal flat plate collectors

  • Structured solar glass 3.2mm thick with 91% solar transmission
  • Vertical dimensions in mm: L 2033 x W 1233 x H 80
  • Horizontal dimensions in mm: L 1233 x W 2033 x H 80
  • Vertical and horizontal panels weight: 38kg


Solar water heating systems use solar panels fitted to the roof. They collect heat from the sun and use it to heat up water which is stored in a hot water cylinder.

Virtually every Vaillant solar domestic hot water system starts with roof-mounted collectors that heat solar liquid. auroTHERM VFK 145 range of flat plate collectors featured toughened 3.2mm solar glass and a simple panel design that can be specified for any on-roof, in-roof or using flat roof configuration.

Features and benefits

  • Ability to offer a complete system solution - Can be used with all Vaillant equipment in order to offer a full Vaillant solution
  • Flexible siting options - Can be specified on-roof, in-roof or on a flat roof (mounting bracket options available to suit various roof tile types)
  • Supplied as complete solar installation kit - For ease of specification
  • Various intelligent control and cylinder options available - A total system solution from one manufacturer
  • Black frameless design - Best appearance whilst ensuring maximum use of collector area resulting in high performance and efficiency
  • Collector weighs 38kg and dimension of 1233mm x 2033mm - Helping with ease of installation
  • MCS accredited - Manufactured to a high quality and qualifies for various government incentives



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