Suitable (approved) fuels, which type of wood is best?
Your CERA RONDOTHERM stove is a wood-burning stove which can also normally be fuelled with wood briquettes. You
can only achieve optimum combustion and environmentally-friendly heating if you use natural wood in the form of logs.
A wood fire creates comfortable and cosy heat. Please follow the recommendations below closely for your own comfort and
to protect the environment.
Maximum length of logs:
30 cm
Maximum cross-section (diameter) of logs: 10 cm
Place logs as follows depending on rated heat output:
4 kW
5 kW
6 kW
max. 2 logs per fuelling action with
max. 1.2 kg max. 1.6 kg max. 2.0 kg
Max. 2 fuellings within a 2 hour period
Firewood reaches a residual moisture level of between 15% and 20% after storage over around 2 years outdoors and if well-
ventilated (only covered from above, no contact with possibly moist ground if possible), and is then most suitable for burning.
If the residual moisture level is higher, the heating value is lower. If wood is burnt when wet, the water first needs to be
boiled out before the actual wood combustion can take place. In addition to heating value losses, this results in the
combustion chamber temperature lowering, and this reduced temperature means that not all wood constituents can be fully
burned. Wood gases will be discharged out of the chimney unburnt, and will deposit themselves as tar or soot in the
chimney. This insulates the stove components which give off heat, and also causes air pollution when it escapes into the
atmosphere. All this means that burning moist wood is not only uneconomic, but also environmentally polluting. On top of
this, your stove glass will become blacker much more quickly.
Wood is not a continuously combusting fuel which means that leaving the stove to burn overnight with wood is not possible.
If you try this, for example using wood briquettes to "keep the embers in overnight", you will be burning with too little oxygen
and producing polluting substances for the environment and the flue gas pipework in the exhaust gas. This type of "heating"
is forbidden!
Wood briquettes have a heating value of around 5.0 kWh/kg and a residual moisture level of around 7%.
According to the German Federal Emission Control Act, it is forbidden to burn the following "fuels" for heating / in stoves:
♦
wood which has been treated with preservatives or is moist
♦
sawdust, woodshavings, sanding dust; bark and chipboard waste, coal slack
♦
other wastes, paper and cardboard (except for small quantities for igniting) or straw
Maintenance
Every stove should be maintained by a professional once a year. This is particularly important in low-energy and passive
houses! Here the professional will check all connection pieces and seals among other things.
Spare Parts
Please request any necessary spare parts from your specialized company.
Special Instructions:
•
The manufacturer’s warranty will become void on extended or constant overloading of the stove’s rated heat output, as
well as the use of other fuels except those allowed.
•
For safety reasons, keep the combustion chamber door closed at all times, even when the stove is not in use.
•
Do not remove hot ash. Only tip ash into fireproof, non-flammable containers.
•
Never use spirits, petrol or other flammable liquids to light the fire.
•
No objects of combustible material are allowed to be positioned within a distance of 80cm, measured from the viewing
window, of the direct stove heating area (=sides from where the fire is visible).
•
We reserve the right to make implementation and dimensional changes serving technical progress. You can find current
facts and information on the Internet at
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