Rhenanus school

Overall planning

Bad Sooden-Allendorf, Germany

Operational since 2011


The plant

A biomass heat plant was installed in the Rhenanus school in Bad Sooden-Allendorf, and the existing heat distribution systems were renovated. Approximately 80% of the energy required for heat generation is provided through locally sourced untreated forest wood chips. This results in the replacement of approximately 100.000 liters of heating oil per year with wood from the region.

The technology

In a separate small heating house (with a construction volume of 360 m³), a biomass combustion system with a boiler capacity of 350 kW and a pre-installed fuel storage for wood chips was installed. A new peak load boiler was also installed in the new heating center. It is operated with heating oil during winter to cover peak demand and during the summer months for partial or low-load operation. The delivered wood chips are stored in a push floor system with fully automated discharge (storage volume of approximately 150 m³). The integration of the boiler system into the existing pipeline network is done through a district heating pipeline. A multi-cyclone and an electrostatic precipitator are used for flue gas dedusting, ensuring compliance with legal emission limits.


  • Implementation during regular school operations
  • Concept approval in March 2010
  • Permit granted in December 2010
  • Construction started in April 2011
  • Installation of main components in May 2011
  • Laying the local heating route July 2011
  • Commissioning in October 2011


  • The use of a regionally available, CO2-neutral renewable fuel.
  • Approximately 265 tons of CO2 are saved per year.
  • It serves as a flagship project for climate protection in the region.
  • Capital flows and value creation are kept within the region.
  • Cost-effective energy generation helps conserve public funds.

Technical data

Power requirements

Power requirements of the school center

1.160 kW

Base load boiler capacity

380 kW

Peak load boiler capacity

780 kW

Heat coverage efficiency

Fuel consumption


Fuel consumption

Forest wood chips

approx. 400 t/a

Heating oil

approx. 26.000 l/a

Flue gas dedusting

Multicyclone, electrostatic precipitator