This standard specifies calculations for the dimensioning of Kachelgrundöfen/Putzgrundöfen (tiled/mortared
stoves) based upon the required nominal heat output of the stove as declared by the producer. The
Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) are of individual one-off construction design. The
standard can be used for log wood fired Kachelöfen (tile stoves) that burn one fuel load per storage period
with a maximum load between 10 kg and 40 kg and a storage period (nominal heating time) between 8 h and
This standard is valid for Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) equipped with fireclay as
interior material, with an apparent density between 1,750 kg/m³ and 2,200 kg/m³, a degree of porosity from 18
% up to 33 % by volume and a heat conductivity from 0,65 W/mK up to 0,90 W/mK (temperature range 20 °C
to 400 °C).
This standard is valid for Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) with sidewise combustion air
supply of the combustion chamber and an inflow speed from 2 m/s to 4 m/s, whereas the height of the lowest
opening is at least 5 cm above the bottom of the combustion chamber.
This standard is not valid for combinations with water heat exchangers for central heating or other heat
absorbing elements like glass plates greater than 1/6 of the combustion chamber surface, open water tanks,
etc. It is also not valid for combinations with heating/fireplace elements according to EN 13229. Furthermore
this standard is not valid for mass-produced prefabricated or partly prefabricated slow heat release appliances
according to EN 15250.
NOTE Although for the purposes of this standard these calculations are applicable only to the requirements of this
standard, the same calculations can be used for other purposes, e.g. to verify emission levels and energy efficiency in
case of burning log wood or wood briquettes according to the producer’s manual.