Further Information; Non-Wood Biomass Fuels; Wood Fuel Regulations And Standards - Viessmann PYROMAT ECO Technical Manual

Principles of wood combustion for generating heat

Further information

Ash and cleaning
Natural wood without bark has a percentage of ash less than 0.5 % of
1
the supplied fuel mass. All information regarding cleaning work is
based on natural wood with attached bark and an ash percentage of
0.8 %. The cleaning and maintenance work for other wood fuels should
be adapted according to the quantity, the specific weight and the ash
characteristics.

Non-wood biomass fuels

Non-wood fuels made from biomass such as needles, leaves, cereals,
straw, husks, fruit stones, etc. are unsuitable as fuels for fault-free
operation, and are therefore not permitted.

Wood fuel regulations and standards

Germany Revised first version of BImSchV dated 22.03.2010
Austria FAV dated 18.11.1997 "Ordinance for Combustion Systems" § 3.(1) 3. Solid fuels
Agreement between the Federation and the Laender in accordance with section 15a, B-VG on energy savings
Agreement between the Federation and the Laender in accordance with section 15a, B-VG on safety measures for small
combustion appliances
Switzerland Clean air regulations LRV dated 16.12.1985 (version 28.03.2000)
France NF Bois de chauffage
ÖNORM M 7133 Woodchips for energy purposes (1998)
EN 303-5 Boilers for solid fuels, table 8 "Test fuels"
EN 14961-1 Solid biofuels - fuel specifications and classes - part 1: General requirements (2010 04 01)
EN 14961-3 Solid biofuels - fuel specifications and classes - part 3: Wood briquettes for non-industrial use (2010 07 15)
EN 14961-5 Solid biofuels - fuel specifications and classes - part 5: Firewood for non-industrial use (2011 04 15)
6
(cont.)
Changing fuels
Frequent and intensive changes in fuel quality, e.g. bulk density, water
content, dust proportion and ash content, can require a manual adjust-
ment of the combustion system parameters.
In some cases, the fuel properties (elemental composition, ash sinter-
ing point, etc.) differ considerably from those of wood. Combustion of
such fuels in a Pyromat Eco can lead to an impairment of the com-
bustion characteristics and increased stress on the fireclay lining and
the heat exchanger surfaces. Warranty claims can therefore only be
asserted when using approved fuels.
PYROMAT ECO