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Pellet boiler
Pellet boilers are used as central heating systems for heat requirements (heating load) of more than 3.9 kW (Kilowatt). But pellet central heating systems are not only used in single or two family homes (up to 30 kW), but also for larger residential or business units with heat requirements of a few hundred kW. Pellet burner systems run most efficiently at full load and can usually be regulated down to up to 30% of its full capacity. Since the warm up phase of pellet ovens 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 ovens are usually combined with buffer systems like water tanks for example.
== Operation method ==
Similar to wood chip fuel heating systems also pellet fuel is delivered periodically and automatically from the pellet storage (for central heating systems) or the day tank (for pellet stove) according to need in the combustion chamber. With the heat generated from the heating circuit water is heated in the boiler of the pellet in pellet central heating systems. The heat distribution is the same as in other systems, which use water for heat distribution. Unlike for oil or gas heating systems, pellet heating systems demand the integration of a hot water tank in the heating system in order to reduce heat losses.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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