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5.0 Use
5.1 Choice of fuel
Always use quality wood. This will give you optimal results,
any other fuel may damage the fireplace.
5.2 Jøtul's definition of quality
firewood
With good quality firewood we mean logs of, for example,
birch, beech, and pine.
Good quality firewood should be dried so that the water
content is maximum 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 should be covered
on top 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 of 1 kg of firewood
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 birch will provide less energy
(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 firewood (0%
humidity) produces about 5 kWh, while firewood with a
humidity 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.
• The fireplace emits little warmth.
• Risk of chimney fire as a consequence of accumulation
of soot in the fireplace, flue pipe and chimney.
• The fire may die out.
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
This may harm the product and pollute the atmosphere.
N.B. Never use combustible liquids such as petrol, kerosene,
red spirit or similar to start the fire. This may cause harm
to both yourself and the product.
18
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5.3 Log length and amount
The maximum length of logs to be used is 40 cm. Jøtul F
100 has a nominal heat output of 5.5 kW. This is equivalent
to a consumption of approximately 1.8 kg of logs per
hour.
The Jøtul F 100 is a product that uses an extra air supply to
enable the afterburning of hazardous gases and particles.
It is important that the system is used correctly.
Another important factor for proper fuel consumption
is that the logs are the correct size. The size of the logs
should be:
Kindling:
Length: 20-40 cm
Diameter: 2-5 cm
Amount per fire: 6-8 pieces
Firewood (split logs):
Length: 40 cm
Diameter: Approx. 8 cm
Intervals for adding wood: Approx. every 60 minutes
Size of the fire: 1.8 kg
Amount per load: 2 pieces
5.4 First time use (see fig. 6)
• Light the fire as described under «5.5 Daily use».
• Light the fire for a couple of hours and ventilate any
• Repeat this a couple of times.
N.B. Odours when using the fireplace for the first time.
Painted products: The fireplace may emit an irritating
gas when used for the first time, and it may smell a little.
The gas is not toxic, but the room should be thoroughly
ventilated. Let the fire burn with a high draught until all
traces of the gas have disappeared and no smoke or smells
can be detected.
Enamelled products: Condensation may form on the
surface of the fireplace the first few times it is used. This
must be wiped off to prevent permanent stains forming
when the surface heats up.
5.5 Daily use
The product is intended for intermittent combustion.
By intermittent combustion one means normal use of a
fireplace, meaning that each fire should burn down to
embers before new firewood is added.
Lighting
• Open the vents by moving them to the right (fig. 2A + 2B).
•
• Crumple some newspaper (or birch bark) between these
smoke and smell from the product.
Place two medium sized logs in/out on each side of the
base.
and add some kindling wood in a criss-cross pattern on
top and light the newspaper. Gradually increase the size
of the wood. See fig. 6.
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