Rules for setting up biofuel plant

Are you considering to purchasing a biofuel plant, you should be aware of a number of requirements, for both the heating system and the installation. All biofuel plants, from wood stoves to pellet heating, must be tested and approved before they can be installed. It is required for efficiency, particle emission and fire conditions around the installation. As a consumer, you should always make sure that these requirements are met.

Efficiency requirement of biofuel plant

According to the Building Regulations, all biomass-fired boilers are required to have an efficiency that comply with the class 5 boiler, according to standard EN 303-5. This means eg., A 20 kW boiler, must have an efficiency of at least 88.3%.

The efficiency of new bio-fuel boilers is currently at 80-90% for manually fired boilers and 85-95% for automatically fired boilers.

Boilers which are fired with straw, are exempt from this requirement.


Read more in the Building Rules, section 8.5. (Danish Only)

For stoves and pellet stoves, they are required by EU's mandatory CE marking, to have a minimum efficiency of 50%. The majority of modern furnaces have an efficiency of 70%. If you choose a Swan labeled stove, it is required to have an efficiency of at least 75%.

Emission Requirements for biofuel plant

In order to reduce air pollution from bio-fuel plants, requirements for particle pollution are in place . In practice this means, when setting up a bio-fuel plant it has to always be accompanied by a test certificate for the stove, as documentation for a legal installation that complies the requirements for particulate emissions.

The test certificate must be signed by your chimney sweep, before the plant can be connected. it the owner's responsibility to make sure the plant has the required documentation / test certificate.

The rules can be read in the wood stove Order (Danish Only)

Fire requirements for biofuel plant

For proper and safe operation, bio-fuel plants must be installed correctly. The system should always be fitted by the supplier, in accordance with applicable legal requirements.

This means, the plant must comply with the requirements of fire safety, as specified in the building code (Chapter 8.5) (DanishOnly) , Fire engineering's Instructions (BTV 32) (DanishOnly), and WEA regulations (At manual B.4.8) (DanishOnly)