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Pellet (granule) boiler - heating boiler, which as fuel uses wood fuel pellets (pellets), pressed on a special press (pelletizer) from wood chips, sawdust and other residues from the woodworking industry.
The combustion chamber of these boilers is relatively small, because the main heat removal occurs in a well-developed multi-way convective part of the boiler (up to 70%). As a result of this design of the pellet boiler, the temperature of the flue gases is only 100-200 °C. The boiler is equipped with a special pellet burner of volumetric type, which provides a higher efficiency of the boiler during combustion of pellets, than other categories of solid fuel boilers, and is comparable in efficiency with boilers on natural gas.