9
GB
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
4. Using the sauna
heater
4.1 Firewood
Both hardwood and softwood can be used to heat the sauna
heater. The use of chipboard, fibreboard, painted or impreg-
nated wood, waste or plastic is prohibited. To ensure clean
burning and the largest possible efficiency, the wood must be
dry. The moisture content of the wood must be less than 20%.
Usually good firewood 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 firing!!
4.2 Heating
Before heating, make sure that there is no combustible mate-
rial within the safety clearances. Also make sure that the ash
drawer and fire grate are clean and if the sauna heater is pro-
vided with a water tank, that it is filled with clean water. Check
if there is sufficient draft in the smoke flue. If you hesitate re-
garding the draft, check it by burning a small quantity of water
in the firebox first. During heating the door of the firebox must
be closed and the water tank must be filled with water. The
sauna heater must not be covered with anything.
To start heating pile firewood over a sufficiently wide area and
ignite it from above. For ignition you may use birch bark or
paper. Ignition aid should be placed between the upper fire-
wood and it can be topped with some thinner wood sticks or
firewood (see drawing 9). Igniting from above reduces pollu-
tion and ensures cleaner burning.
The power of the sauna heater can be regulated by 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 it
soughs too much in the sauna heater, reduce the draft. To do
this close the ash drawer halfway or completely. This way heat
reaches better in the sauna heater, stones can store heat and
you do not just heat up the flue. A calm flame is a sign of a cor-
rect draft. Avoid heating the sauna heater so that the channels
of the stone compartment glow red for a long time because
this will overload the firebox and the service life of the sauna
heater will be reduced. Overheating may also cause excessive
heating of the smoke flue and cause a fire hazard. The connec-
tive flue pipe must not be glowing red.
Figure 9.
Properly stacked firewood.
The following table shows the recommended quantities of fire-
wood 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 pursuant to standard EN15821. In the test
the size of the sauna was determined based on the maximum
area for the given sauna heater and temperature of 90 °C was
achieved in the sauna.
During first times we recommend
using less firewood for achieving the desired temperature
than values presented in the table. Maximum quantity of
firewood per hour (max kg/h) indicated in the table must
not be exceeded.
Luosto
Luosto VS
Inari
Pallas
1. firebox of firewood
(sticks of firewood with a diameter around 5 cm, length around 33 cm and weight around 0.5 kg)
quantity of firewood (kg)
3,5
3,5
3,5
3,5
opening of the ash drawer (mm)
20
20
20
20
1. lisäys
quantity of firewood (kg)
2,5
2,5
2,5
2,5
opening of the ash drawer (mm)
10
10
10
10
2. lisäys
quantity of firewood (kg)
2,5
2,5
2,5
2,5
opening of the ash drawer (mm)
10
10
10
10
max kg/h
7
7
7
7
Heating of the sauna:
Figure 9.
