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 m
3
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 massive 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 mini-
mum 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 pro-
vides 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 installed 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 heating 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 distances
between the sauna heater and structures made of combus-
tible materials. Please observe the stipulated requirements
regarding walls, floors, sauna benches, other inventories and
storage areas of firewood!
Structure
Safety clearance
Top surface
1280 mm
Front surface
500*)** mm
Side surface
300** mm
Back surface
350** mm
* We recommend leaving 1000 mm maintenance area in front
of the sauna heater.
** Safety clearance as measured from the height of the door
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 permitted 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 above-
mentioned 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 pro-
tective screeds.
Protecting a wall made of combustible material
Figure 3.
