Thermosiphon system

Thermosiphon system


Thermosiphon systems are systems for producing heat from solar energy operating on the thermosiphon principle. The thermosiphon is a passive design, which allows heat transfer using natural convection ideally in a vertical, closed fluid loop. The advantage is that it avoids using a conventional pump, which keeps the complexity and costs of a thermosiphon system low.
The thermosiphon system is available in three designs. They are characterised by high-selectivity coated harp absorbers and tank sizes perfectly coordinated with the system, together with unique charging properties. All necessary pipes, fittings and frost protection are included with delivery.

Area of use

  • Parallel roof and free-standing installation



  • Solar-Keymark system test EN 12976
  • High efficiency thanks to high-selectivity coated absorber
  • Laser-welded, harp system
  • Long service life, robust, temperature- and weather-resistant design
  • Low heat loss thanks to excellent tank insulation
  • Quick and simple installation
  • No additional costs for pumps, solar station, etc.
  • No solar control unit required
  • Compact and space-saving design
  • All necessary pipes, fittings, pressure relief valves and frost protection are included with delivery