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7.0 Choice of fuel
Always use the specified fuel. (Fuel type is described in «2.0
Technical data» in the installation manual for each product).
This will give you optimal results. Use of other fuels may damage
to the product.
7.1 Jøtul’s definition of quality firewood
By good quality firewood we mean logs of, for example,
birch, beech and oak.
Good quality wood should be dried so that the water content is
approx. 20%.
To achieve this the wood should be chopped at the latest in late
winter or early spring. It should be cut and stacked so that air
circulates around it. The stacks must be protected so as to avoid
absorbing excessive rainwater. The logs should be taken indoors
in autumn for use during the winter season.
The amount of energy obtainable from 1 kg of wood varies very
little. On the other hand the specific weight of the different kinds
of wood varies considerably. As an example, a certain volume of
fir will provide less kWh than the same volume of oak, which has
a higher specific weight.
The amount of energy produced by 1 kg quality wood is about
3,8 kWh. 1 kg of completely dry wood (0% moisture) produces
approximately 5 kWh, while wood with a moisture level of 60%
produces only around 1,5 kWh/kg.
Consequences of using damp wood may include:
• Appearance of soot/tar on the glass, in the fireplace and in
the chimney.
• Fireplace will give less heat.
• Risk of chimney fire as a consequence of accumulation of soot
in the fireplace, flue pipe and chimney.
• The wood is difficult to light and the fire can die.
Be especially careful never to lay a fire using any of the following
materials:
• Household waste, plastic bags, etc.
• Painted or impregnated wood (highly toxic).
• Chipboard or laminated boards.
• Driftwood (seawater).
This may harm the product and pollute the atmosphere.
N.B. Never use combustible liquids such as petrol, kerosene,
alcohol or similar to start the fire. This may cause harm to both
yourself and the product.
7.2 Jøtul’s definition of quality coal
By good quality coal we mean mineral coal according to
the specifications in EN 13240, table B.2. (Briquetted fuel
for closed appliances.) For example use: Phurnacite.
7.3 Fuel size and amount
Jøtul’s products are developed to have excellent combustion.
An important factor for good combustion is that the fuel is the
correct size. The size and amount of fuel should be as described in
«2.0 Technical data» in the installation manual for each product.
7.4 Intermittent/continuous
c
ombustion
Intermittent combustion
Most of Jøtul’s products are designed for intermittent
combustion. (See installation manual «2.0 Technical data«
for each product).
Intermittent combustion in this context means normal use
of the fireplace, i.e. fuel is added as soon as the fuel has
burnt down to a suitable amount of embers.
Continuous combustion
Some products are suitable for continuous combustion. (See
installation manual «2.0 Technical data« for each product).
Continuous combustion in this context means that a
fireplace can burn overnight without having to relight
the fire.
