page_title: Pellet boiler
section_title: Power range and efficiency
hierarchical_section_title: Pellet boiler / Operation method / Power range and efficiency
caption_attribution_description: Español: Caldera de biomasa Bronpi hydro plus pellets y hueso de aceituna
context_page_description: A pellet boiler is a heating system that burns wood pellets. Pellet boilers are used in central heating systems for heat requirements from 3.9 kW to 1 MW or more. Pellet central heating systems are used in single family homes, and in larger residential, commercial, or institutional applications. Pellet boiler systems run most efficiently at full load and can usually be regulated down to 30% of full load. Since the warm up phase of pellet boilers usually takes longer than for oil or gas firing systems, short burning phases have negative effects on the fuel efficiency. In order to improve energy efficiency and reduce harmful emissions, pellet boilers are usually combined with buffer systems, such as insulated water tanks.
context_section_description: Pellet systems are available in different power ranges from about 3.9 Kilowatt single ovens between about 4 and 20 kW. Most systems available today have a power control over the fuel and combustion air supply, so that they can be operated at full load and at part load. Currently pellet boilers achieve a combustion efficiency of about 85-95% at full load (nominal thermal output) in thermal power operation.
  With few exceptions, the efficiency decreases when the pellets boiler operates at partial load. The technical heating efficiencies described may vary greatly from the actual plant efficiencies, the reason the plant concept plays a major role. The use of a sufficiently large buffer storage is useful.
caption: Standalone biomass pellet boiler
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