Wood chips: “Green” efficiency at low cost

The wood chips are made of flakes of woody material of approx. 1-12 cm long and a few mm thick, obtained by the fragmentation of various types of wood with special machines called chippers.

Like other woody biomasses, it is a renewable source because the materials of waste represent the raw material for the growth of plant species of origin in a closed cycle on a global scale.

The possibility to chop wood of any shape, allows to obtain a low-cost fuel easily usable by automatic loading systems of modern Tatano wood chip boilers.


EN 14961-2: European standard

The main qualitative characteristics of wood chips for energy use, defined on the basis of the European standard EN 14961-4, are: the qualitative class, size, water content and ash.

Quality class according UNI EN 14961-4:

  • Class A1 and A2
    Whole plants without roots, trunks, wood residues not chemically treated, cutting residues and limbing.
  • Class B1
    Wood from forest, short cycle crops and other virgin wood, wood residues not chemically Treated
  • Class B2
    By-products and residues from the first wood processing, post-consumption wood

The material previously used for other purposes (for example: pallets) is chipped for thermal use using grinders. The metal parts must be removed by magnetic separators.

Water content M according to UNI EN 14961-4

The water content (M = moisture) expressed in percentage terms is acceptable up to M35 (water content less than 35%), M25 is preferred for storage and greater yield.


Ash content According to UNI EN 14961-4

It is expressed in percentage terms referred to the dry mass. The following values are accepted for each qualitative class of wood chips:

  • Class A1, characterized by an ash content A ˂ 1%.
  • Class A2, characterized by an ash content A ˂ 1.5%.
  • Class B1 and B2, characterized by an ash content A ˂ 3%.


Thermal Budget

  • 1 m³ methane ≈ 3 Kg wood chips
  • 1 Kg heating oil ≈ 3 Kg wood chips
  • 1 Kg LPG ≈ 4 Kg wood chips
    • Conformity
      EN 14961-4
    • PCS (Higher heating value)
      3,7-3,8 KWh/Kg
    • PCI (Actual calorific value)
      3-3,4 KWh/Kg
    • Moisture content (M)
      15 < w > 35 %
    • Volume density
      200-300 Kg/m³
    • Ashes (A) % in weight

Which type of heating system do you choose for your home?

To choose the right solution among all those available, it is essential to consider: the reference environment, the characteristics of the dwelling, the power required, the fuels available and in particular the needs of use.

ChWood chip boilers are among the cheapest in the biomass range.
They are widely used wherever heat demand is high in both residential and industrial heating systems.

Wood chip boilers are an excellent solution if:

  • You reside in an area of wooded or agricultural land or wherever there are branches and pruning residues.
  • You have a space to store fuel
  • You have the space to install a hopper and a medium-sized plant
  • You have an activity related to wood processing: you can self-produce the wood chips and increase the convenience of the plant
  • You want to contain expenses on the purchase of fuel. You can save up to 70% compared to diesel fuel and up to 60% compared to natural gas
  • You want to amortize the cost of the entire plant in just a few years
  • You want to ensure maximum ease of use. Tatano wood chip boilers operate completely automatically, are equipped with control and safety devices that make them reliable, efficient and safe.