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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.
Do not stack firewood in the firebox over 2/3 of its height.
Quantities of firewood are shown in clause 4.1. In the igniti-
on phase the ash drawer can be kept open by 10 mm more
than indicated in the table. After igniting put the ash drawer
back in the position as shown in the table.
In a sauna heater equipped with a water tank or in a sauna
heater that is heated from another room firewood should
not be burnt in the front part of the firebox / in the extensi-
on, but the firewood must be placed entirely on the grate
of the firebox.
Do not forget that the sauna heater and its part be-
come very hot during heating. If you need to touch the
parts of the sauna heater, always use protective gloves.
When moving around in the sauna be careful, because
the floor and the ceiling of the sauna may be slippery.
Be careful – water in the water tank of the sauna heater
may be very hot.
One firebox of firewood burns approximately half an hour. A
good time for adding firewood is when there are still some
blue flames on the coal in the firebox. Before adding fire-
wood you may even slightly smooth coal on the grate. If
firewood is added in the flames too early, the temperature
of fume gases increases. Do not use the door to push fire-
wood in the firebox.
In case the sauna is used or the sauna heater is heated also
after the recommended number of times firewood should
be added as shown in the table, firewood should not be
added according to the quantities mentioned in the table. A
proper quantity for keeping heat is 1-2 logs (approximately
1 kg of firewood) every half an hour. The ash drawer may be
closed a bit. If you add a big quantity of firewood, the tem-
perature of flue gases rises and this can damage the smoke
flue and cause a fire hazard. But do not heat continuously
over 3 hours. Thereafter, the sauna heater must be allowed
to cool down before the next heating.
In case the sauna will not be used any longer and coal is
still glowing without flame, extinguishing can be speeded
up by increasing the draft. For this open the ash drawer
by 10-20 mm. There is enough heat accommodated in the
stones of the sauna heater to dry the sauna room.
In the ignition phase the closing pan must be fully open.
Before you close the closing pan after heating, check that
there is no glowing coal in the firebox. Otherwise fumes
may be released in the sauna. Carbon monoxide is an
odourless and colourless toxic gas.
If you have not used the sauna heater and smoke flue for
a longer period or it is cold, please check before use that
the smoke flue is in proper order and that there are no cor-
rosion damages on the sauna heater. Start heating very
slowly and with small quantity of firewood so that not to
damage the smoke flue.
4.3 Steam water
Use normal domestic water for steam water.
Quality requirements for domestic water:
• humus content < 12 mg/l
• iron content < 0.2 mg/l
• calcium content < 100 mg/l
• manganese content < 0.05 mg/l
Do not use sea water or other salty water. Also do not use
water containing chlorine. The warranty of the sauna hea-
ter does not cover damages caused by the use of unsui-
table steam water. Do not throw water on the stones, if you
yourself or somebody else is right next to the sauna heater.
Hot water steam may cause burns.
4.4 Removing the ashes
The ash drawer must be emptied every time before heating
the sauna heater. The ash drawer must be emptied imme-
diately, if ashes fill more than half of the drawer. Otherwise,
the airflow through the firebox grate will be hindered, which
will shorten the life of the grate.
The ash drawer must be emptied in a non-combustible
container (for instance metal bucket) after ash has cooled
down. Do not leave the ash bucket standing by the wall (for
instance on the terrace). If the smoke flue is equipped with
a closing pan, it should be opened for the time the ash is
removed. Dust will escape with the draft.
4.5 Maintenance of the sauna heater
Besides removing the ashes and having the chimney annu-
ally cleaned by a chimneysweep, the sauna heater requires
no other maintenance. To open the cleaning hatch of the
sauna heater, the upper stones have to be removed from
the sauna heater.
The stones of the sauna heater have to be re-arranged once
per year and replaced every other year. Cracking stones
collapse and fall lower, some stones will erode. Remove
eroded and broken stones. Due to insufficient maintenan-
ce the sauna heater needs more time for heating, which in
its turn causes load on the structure of the sauna heater.
The enamel surface of the sauna heater should be cleaned
regularly with a damp cloth.
Also the water tank of the sauna heater should be regularly
cleaned. Use only clean water to fill the tank. If there is
a danger that water can freeze, the water tank should be
emptied.
4.6 Disposal
For disposal take the sauna heater to a public waste
recycling centre.
