Yrittäjäntie 14, FI-27230 Lappi • tel. +358 0207 416 740 • fax +358 0207 416 743 • www.narvi.fi/en Yrittäjäntie 14, FI-27230 Lappi • tel. +358 0207 416 740 • fax +358 0207 416 743 • www.narvi.fi/en
9 EN
4. Using the sauna
heater
4.1 Firewood
Both hardwood and softwood can be used to heat the
sauna heater. The use of chipboard, breboard, painted
or impregnated wood, waste or plastics is prohibited. To
ensure clean burning and the largest possible efciency,
the wood must be dry. The moisture content of the wood
must be less than 20%. Normally good rewood is sticks
of wood the diameter of which is around 5 cm, length
around 33 cm and weight around 0.5 kg.
Use of liquid fuel is strongly forbidden, also during ignition!
4.2 Heating
Before heating, make sure that there is no combustible
material within the safety clearances. Also make sure that
the ash drawer and re grate are clean and if the sauna
heater is provided with a water tank, that it is lled with
clean water. Check if there is sufcient draft in the smoke
ue. If you hesitate regarding the draft, check it by burning
a small quantity of paper in the rebox rst. During heating
the door of the rebox must be closed and the water tank
must be lled with water. The sauna heater must not be
covered with anything.
To start heating pile rewood over a sufciently wide area
and ignite it from above. For ignition you may use birch
bark or paper. Ignition aid should be placed between the
upper rewood and it can be topped with some thinner
wood sticks or rewood (see drawing 9). Igniting from
above reduces pollution and ensures cleaner burning.
The power of the sauna heater can be regulated with the
ash drawer. If the ash drawer is closed, the power of the
sauna heater is at its lowest and the burning time is longer.
If the sauna heater soughs too much, reduce the draft. To
do this close the ash drawer half way or completely. This
way heat reaches better the sauna heater, stones can store
heat and you do not just heat up the ue. A calm ame is
a sign of a correct draft. Avoid heating the sauna heater so
that the channels of the stone basket glow red for a long
time because this will overload the rebox and the service
life of the sauna heater will be reduced. Overheating may
also cause excessive heating of the smoke ue and cause
re hazard. The connective ue pipe must not be glowing
red.
Figure 9. Proper stacking of rewood.
The following table shows the recommended quantities of
rewood for different types of sauna heaters and positions
of the ash drawer. The values shown in the table meet the
values of the nominal power test pursuant to the standard
EN15821. In the test the size of the sauna was determined
based on the maximum area for the given sauna heater and
Aito sauna heater 16 16VS 20 20VS 24 24VS
1. quantity
quantity of rewood (kg) 4 4 3,5 3,5 4,5 4,5
opening of the ash drawer (mm) 20 20 20 20 20 20
1. addition
quantity of rewood (kg) 3 3 3 3 3,5 3,5
opening of the ash drawer (mm) 10 10 10 10 10 10
2. addition
quantity of rewood (kg) - - 2,5 2,5 3,5 3,5
opening of the ash drawer (mm) - - 10 10 10 10
max kg/h 6 6 7 7 8 8
Heating of the sauna:
Figure 9.
(The cleaved log that is about 5 cm in diameter and about 33 cm long weighs about 0.5 kg)
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