5
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
2. Before you install the
sauna heater
Before installing and using the sauna heater, make sure you
are thoroughly familiar with the requirements for installing
the sauna heater in the steam room. In case of questions
and for additional information do not hesitate to contact
the Rescue Board or a construction supervision authority.
When installing fireboxes all local laws have to be followed,
including those referring to local and European standards.
2.1 Steam room
If the walls of a steam room are made of uncovered glass,
brick or concrete add 0.8–1.5 m3 per square meter of such
wall and the final choice of the heater shall be made based
on the sum of the area. If the heater is installed in a sauna
that is normally not heated or the sauna is made of mas-
sive logs, multiply the sauna area by 1.5 and choose the
heater based on this. The recommended minimum area of
a steam room is indicated in clause 1.1. Please follow the
values for the minimum area stipulated for a steam room.
We recommend choosing a sauna heater with slightly more
power to ensure proper heating of the sauna and to avoid
heating the sauna heater to its upper limit. Slightly stronger
power ensures a longer lifetime of the sauna heater and
provides better steam thanks to a greater quantity of
stones.
2.2 Substrate
A firebox must be installed on the floor with sufficient
load-bearing capacity. The durability of the floor must be
checked especially carefully, when the sauna heater is in-
stalled on a wooden floor. The weight of the sauna heater
is shown in clause
1.1.
CONCRETE FLOOR
The sauna heater may be installed directly on a concrete
floor, which is at least 50 mm thick. If underfloor heat-
ing cables or pipes are located under the sauna heater, a
Kota installation base must be used to protect them from
the sauna heater’s thermal radiation.
FLOOR MADE OF COMBUSTIBLE MATERIAL OR A TILED FLOOR, UN-
DERFLOOR HEATING
A Kota installation base must be installed under the sauna
heater, which will protect the floor, moisture barrier and un-
derfloor heating pipes or cables from the thermal radiation
of the sauna heater.
2.3 Safety clearances
When installing the sauna heater, safety clearances must
be taken into account. Ignorance of safety clearances
causes a fire hazard. If required, additional information
can be obtained from the regional branch of the rescue
board.
2.3.1 Structure made of combustible materials
The safety clearances are the minimum allowable dis-
tances between the sauna heater and structures made
of combustible materials. Please observe the stipulated
requirements regarding walls, floors, sauna benches, other
inventories and storage areas of firewood!
Structure
Safety clearance
Top surface
1 350 mm
Front surface
500* mm
Side surface
250 mm
Back surface
250 mm
*) We recommend leaving 1000 mm maintenance area in
front of the sauna heater.
The safety clearance can be reduced by 50% when a
single light protective screen is used and by 25% when a
double light protective screen is used. Yet the gap between
the sauna heater and the protective screen must always be
at least 50 mm. The safety clearance between the sauna
heater and the ceiling can be reduced by maximum 300
mm when a single protective screen is used. It is not per-
mitted to use a double protective screen in the ceiling.
A single light protective screen
can be made of a non-
combustible, fibre-reinforced cement plate that is at least
7 mm thick or a metal plate that is at least 1 mm thick,
which is attached to the wall sufficiently tight. An air gap
of at least 30 mm must be left between the surface to be
protected and the board.
A double protective screen
can be made of the two
abovementioned boards. Ain air gap of at least 30 mm
must be left between the boards and the wall. There must
be a gap between the protective screeds and the floor and
ceiling so that air can circulate and cool the gaps between
the boards. 120 mm masonry structure at a distance of
30 mm from the surface to be protected corresponds to a
double protective screed. We recommend using factory-
made double Kota protective screeds.
Protecting a wall made of combustible material:
If the
sauna heater is installed on a floor made of combustible
materials, an installation base must be used. A piece of
sheet metal must be installed in front of the installation
base, which extends at least 100 mm over the sides of
the heater hatch and at least 400 mm in front of the sauna
heater. The sheet metal edges facing the sauna heater
must be turned up, so that coal cannot get under the in-
stallation base.
Please observe that the safety clearance of an uninsu-
lated smoke flue from structures made of combustible
