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Pellet heating - prices and running costsA pellet heater is operated with small pressed wood pellets of sawdust or wood shavings. Because these pellets are produced from renewable raw materials, which are mainly produced as waste products in sawmills and in woodworking, such central heating systems are becoming increasingly popular.
Although they are more expensive to purchase than gas or oil heating systems, they will pay off over time due to the lower operating costs.
This is how a pellet heater works
Pellet heating requires a storage for the pellets, which are ordered from time to time in larger quantities and delivered to the house. From this warehouse there is a feeder which automatically transports the pellets into the combustion chamber, where they are then burned. The feeders have different systems. In the case shaft chute, a chute is installed from the bearing into the combustion chamber through which the pellets slide into the chamber. The underfeed conveyor and the transverse feed conveyor have a screw conveyor, which transports the pellets into a burning plate. In the case of underfeed conveyance, the pellets are brought from below into the burning plate, while in the case of transverse feed conveying, they are brought from the side. On this plate, the pellets are burned and the ash falls over the edge of the plate in a collecting container. In the case of the roller grate system and the fall firing technique, the pellets are transported from the top into the combustion chamber. In the roller grate system, they fall on rotating steel discs, in the fall-firing technique
on a rust. Combustion is automatically controlled by appropriate technology in all systems. To ignite the pellets located in the combustion chamber, a permanent ember bed, alternatively, this can also be a hot air blower used
become. With the resulting heat, water is then heated in a boiler and passed through the pipes in the house, where it heats the rooms. With a hot water tank integrated into the heating system, the heat can be stored until it is needed. In this way, losses during the warm-up and burnout phase can be avoided. A good pellet heating costs about 15,000 euros, of which, however, the government subsidy can be deducted, which is paid in the form of a grant.
The ongoing operation of a pellet heater
In the case of pellet heating, the ash containers must be emptied regularly, and a sufficient amount of pellets must be stored in the warehouse. On some models, the smoke extractors must be cleaned occasionally. This work can be done by yourself. Otherwise, only an annual maintenance of the heating system is necessary, which is best realized by a maintenance contract with the manufacturer and costs about 200 to 300 euros. In addition, of course, there are the costs for the pellets, which vary depending on consumption and daily price different levels. For a detached house is expected to be about 800 € per year. Two tons of pellets have about the same heating capacity as 1000 liters of heating oil or 1000 cubic meters of natural gas, so that it can be roughly calculated based on the last bill how high the consumption would be for a pellet heating system. When ordering larger quantities of pellets are delivered in silo vehicles and filled directly into the warehouse. Small quantities, on the other hand, are also available in bags or bags.