* it is possible to feed the boiler by logs of 0 10 - 20 cm, wood chips or sawdust on already burning basic layer ** mentioned data represent stacked volume of wood; the calculation of wood consumption according to http://www.tzb-info.cz/t.py?t=16&i = 269 by heat demand of average big house (80 GJ / year) and of the house (140 GJ / year) *** at outstanding the boiler output doesn't go down to 0 immediately, but depending on heating mode **** it is orientation figure, minimum chimney height is influenced by the building position; the statement of the designer or chimneyer is decisive ***** if the boiler is equipped with the sensor of chimney temperature, the upper limit of combustion gas temperature can be set up or adjusted at outlet