In numbers: Boilers with a rated output of 20 kW to 30 kW usually have a fuel chamber that can hold an energy amount of
approx. 130 kW (spruce). Approx. 25kWh are needed to heat the boiler from 20°C to 85°C. In practice, only 70% of this
amount of energy can be used, resulting in a loss per boiler filling of 7.5 kWh. Based on the 3.86 kWh/kg and the
assumption of an energy loss when heating the boiler, the average usable amount of energy per heating period is 3.64
kWh/kg.
An accumulator not loaded to maximum capacity ensures a much better use of the residual heat – therefore a higher
amount of usable energy. The faster the residual boiler heat is dispensed to the loaded accumulator that is not filled to
capacity, the smaller are the boiler heat emission losses, as well as cooling losses through the chimney (see chap. 1.10).
1.22 Protective functions for the boiler/ pumps - valve stuck protection
Protective functions - boiler: If the boiler is not heated for 7 days, the actuators are operated, the O2 sensor is
regenerated and the boiler is aired for 2 minutes to keep it dry.
Pumps- valve stuck protection: They are also operated in the 7-day rhythm; i.e. every Sunday the stuck protection
begins at 3.00 o'clock. In addition, the wood boiler MUST BE SWITCHED OFF at least for 1 hour and the boiler
temperature must be lower than 60°C. The pellet/oil/gas boiler (if available) MUST BE SWITCHED OFF and lower than
60°C.
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