2.7 WHAT HAPPENS WHEN WOOD BURNS
Burning or combustion is a rapid oxidation of substances forming flames. When wood
burns, the oxygen in the air combines with the carbon and hydrogen in the wood. In
the process, energy is released in the form of heat and light. In the ideal case the
products of complete combustion are only carbon dioxide, ashes (formed primarily of
the wood’s mineral constituents), and water.
The combustion process on firewood can be divided roughly into three phases.
Heating and drying –
In this first phase the water and other volatile substances
stored in the firewood evaporate.
Pyrolysis –
In this second phase the firewood decomposes at temperatures from
about 150 °C.
Actual combustion –
In this third phase the gases formed in the first two phases re-
act with additional oxygen from the atmosphere to form carbon dioxide and water.
Also any remaining charcoal burns completely with time in the combustion zone.
Only ashes remain as the single residue of combustion. Each phase of combustion
can be observed very easily on an open fire.
Burning wood is a
proactive contribution
to climate protection!
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A fire needs three
things: fuel, oxygen,
and heat.
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3. APPROVALS AND CERTIFICATIONS
3.1 APPROVAL
Standard for slow heat release appli-
ances fired by solid fuel: DIN EN 15250
operation independent of indoor air
DIBt Nr. Z-43.12-258
3.2 MODEL –
SELF-CLOSING FIRING
CHAMBER DOOR
The Tonwerk storage heating stove is fit-
ted as standard with a self closing and
locking firing chamber door. This is an
important operating and safety element.
The door closes automatically as soon as
it is released. Consequently the Tonwerk
storage heating stove is suitable for con-
nection to flues with multiple installations
(several Model 1 stoves connected to the
same flue).
3.3 SEAL OF QUALITY
On the basis of these tests the Ton-
werk storage heating stove has been
awarded the following approvals:
Schweizerische Brandschutzzulassung
der Vereinigung Kantonaler Feuerver-
sicherungen (Swiss Fire Protection
Approval issued by the Association of
Cantonal Fire Insurance Underwriters)
VKF no. Z 11753
Qualitätssiegel für Holz-Feuerstätten
der Vereinigung für Holzenergie Schweiz
(Seal of Quality for Wood Fireplaces is-
sued by the Association of Swiss Wood
Energy Users) VHe-Nr. 0104/2
3.5 RATINGS PLATE
The ratings plate is installed on the in-
side of the door.
3.6 OPERATION
INDEPENDENT OF
INDOOR AIR
Operating your stove independently
of indoor air requires a direct exter-
nal supply of air to the air nozzle in
the base of the stove. The connectors
must be airtight. Your Tonwerk storage
heating stove is designed for operati-
on at an air/gas flue or with a separate
combustion air line (FC 41x & FC51x).
An application for approval has been
submitted to the DIBt, the German ap-
proval body for construction products.
Check regularly that the firing chamber
door closes properly and the air and
gas ways are tight.
3.4 CE CONFORMITY
The manufacturer, Tonwerk Lausen AG,
confirms that the Tonwerk storage he-
ating stove conforms to the stan dards
under EN 15250 and that the quality
requirements are constantly monito-
red.
