Viessmann's patented switching absorber layer protects high performance flat-plate collectors from overheating and stagnation.

The Vitosol 200-FM and Vitosol 100-FM
high performance flat-plate collectors are the perfect addition to any heating system. With an individual absorber area of 2.3 m2, solar collectors can be effectively matched to any energy demand. On average, they can replace up to 60 percent of the energy that would otherwise be required each year for DHW heating, as well as contributing to central heating backup. When used in conjunction with a condensing boiler, free solar energy can help you reduce your annual energy consumption for heating and DHW by over one third.

ThermProtect prevents overheating
An intelligent absorber layer protects the collectors from overheating. Viessmann's patented ThermProtect technology prevents further energy absorption once a certain temperature has been reached, when the solar cylinder is fully heated. If the switching temperature is exceeded, the crystalline structure of the absorber layer changes, increasing the rate of heat radiation many times over and reducing collector output. The stagnation temperature thus drops significantly, preventing the formation of steam.

​By lowering the collector temperature, the crystalline structure returns to its original state. More than 95 percent of the incoming solar energy can now be absorbed and converted into heat. Only the remaining five percent is reflected. There is no limit to the number of times the change in crystalline structure can be activated, making this function permanently available.
ThermProtect also leads to higher yields
with the Vitosol 200-FM and Vitosol 100-FM compared to conventional flat-plate collectors, as more generous sizing is possible.

Vitosol 200-FM

1.  All-round folded aluminium frame with glazing bead
2. Stable, highly transparent cover made from special glass with ThermProtect
3. Meander shaped absorber
4. Highly effective thermal insulation
5. Absorber panel with ThermProtect coating
   with automatic temperature-dependent shutdown

• Vitosol 200-FM and Vitosol 100-FM high performance flat-plate collectors with ThermProtect switching absorber layer
• No overheating when outside temperatures are high or heat transfer is low
• Higher solar coverage for central heating backup and DHW heating
• Permanently sealed by all-round frame and seamless pane mounting
• Quick and reliable connection through flexible corrugated stainless steel pipe
  push-fit connectors
• Universally suitable for above roof installation, roof integration, flat roof
  installation, or wall mounting
• Can be installed horizontally or vertically
• Attractive design, individually finished in any RAL colour (Vitosol 200-FM)

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