Biomass boilers

Heat from biomass

Biomass is any material of organic origin. Biomass can be used in heating, and wood is the form that is most widely used for that purpose. Wood is carbon neutral as a renewable resource: when burned, the same amount of CO2 that was absorbed by the tree during its growth is released. One of the most efficient ways to use wood for heating are central heating biomass boilers, which can provide high comfort efficiently, while reducing the climate impact of heating (greenhouse gas emissions). Modern heating systems use biomass in the form of pellets, wood chips or split logs.

  • Wood pellets are small, standardised, cylindrical pieces made from natural, untreated wood. To produce pellets, the wood chips occurring in the sawmill are first dried, then cleaned and pressed into pellets in matrices. They require smaller storage spaces than split logs or wood chips as they are more dense.
  • Wood chips are manufactured in various ways. Coniferous wood log pieces that occur in the sawmills and are not suitable for any other processing are crushed directly.
  • Split logs should be dried to reduce the moisture content of wood and increase boiler heat output. They are easy to produce, but require manual feeding of the boiler. Split logs can be used in wood gasification boilers to ensure low emissions.

Efficient central heating with biomass

Wood-based central heating systems use a sustainable and flexible energy. They can supply an entire house with heat throughout the year. Moreover, they can easily be combined with solar thermal systems.

Pellet boilers central heating systems, which are operated with wood pellets are particularly convenient: pellets are kept in a storage room or tank and supplied to the boiler by means of either a suction or screw conveyor system. The systems are fully automated and can be modulated in a power range of 30 to 100 %.

Wood gasification boilers are used to burn split logs efficiently. The individual stages of wood combustion (wood gasification and wood gas combustion) occur separately. This local division – in conjunction with a sufficiently dimensioned heat exchanger surface area – ensures particularly low emissions, low flue gas temperatures and high boiler efficiency. An induced draft fan ensures the correct air supply. The secondary air supply is then responsible for complete combustion. The use of a buffer tank increases the ease of operation significantly.

Wood chip boilers work on the same principle as pellet boilers: The wood chips are transported automatically from a storage room into the boiler by means of a screw conveyor or similar device. An electronic control system regulates the combustion process and constantly optimises it. The output range of wood chip-fired central heating systems ranges from 30 kilowatts to several megawatts. This allows heating of apartment houses and entire business establishments.


  • Efficient use of renewable sources
  • Using locally available fuel
  • Carbon neutral fuel
  • Heating technology for all output levels