Thermomax DF400 Evacuated Tube Collectors


DF400 is a highly efficient Direct Flow solar evacuated tubes collector, providing perfect solution when the ideal installation position is not available. It is a fully pumped 'Wet System' and is recommended especially for industrial and commercial use. This versatile product can be installed on facades or flat roofs both horizontally and vertically.

The superior vacuum inside Thermomax DF tubes protects the system from outside influences such as cold weather or high humidity. The unique ‘plug and play’ design of Thermomax solar collectors makes installation quick and easy. DF400 light slimline manifold is aesthetically pleasing and also supports efficient installation.

Technical information
Thermomax DF evacuated tube collector is a fully pumped 'wet system' offering great flexibility in installation as it can be installed both horizontally and vertically. DF400 solar thermal collectors are recommended especially for commercial and industrial use.

Features and Benefits

  • Highly variable installation methods - can be installed horizontally and vertically, on flat roofs and facades
  • Flexible building integration
  • Suitable for all weather conditions
  • Aesthetically pleasing - slimline manifold
  • Up to 30% more efficient than traditional flat plate panels
  • Supplies up to 70% of your annual hot water needs
  • Simple and easy to install due to 'plug and play' design
  • Direct flow model recommended especially for commercial and industrial use
  • Up to 20 years guarantee (when installed by a Kingspan Accredited Installer)*
  • Excellent customer and technical support available
  • MCS Approved and Solar Keymarked
*T&Cs apply, see installation manual for more information
Number of Tubes 20 30
Absorber Area (m2) 2.009 3.021
Overall Dimensions (mm) 1954 x 1416 x 93 1954 x 2125 x 93
Aperture Area (m2) 2.157 3.23
Fluid Volume (ltr) 4.1 5.6
Inlet and Outlet Dimensions (mm) 22 22
Weight (empty) (kg) 53 78.4
Recommended Inclination (*) 0-90 0-90
Zero Loss Collector Efficiency 0.768 0.768
1st Heat Loss Coefficient (a1): 1.36 w/m2K 1.36 w/m2K
2nd Heat Loss Coefficient (a2) 0.0053 w/m2K2 0.0053 w/m2K2
Stagnation Limitation (˚C) 313 313