Vilpra Sauna GRANNUS VPR-8 User manual

v. 2022-05
Wood-burning sauna stove
Installation and operation manual
GRANNUS VPR-8
Sauna stove shall be installed and operated in accordance with the national legislation and
the requirements set out in this manual. If requirements in national legislation and this manual
vary, it is necessary to follow the more stringent requirements.

Welcome toVilpraSauna!
We congratulate you on your selection and welcome you to the growing user base of Vilpra Sauna stoves. We have done our best regarding
quality, elegance, and technique so that our products will live up to your expectations. Please carefully familiarise yourself with these instructions
before the installation and operation of the stove. Correct installation and operation help to utilise all the features of the Vilpra Sauna stove enjoyably
and safely, and also assures the longevity of the stove. We wish you pleasant sauna moments!
1. Contents of the package
1. Sauna stove
2.
Ashpan
3. Protective glove
4.
Chimney connection pipe L-0,33 m,
Ø 115 mm
5.
Installation and operation manual
2. Technical information
Table 1
Grannus VPR-8
Volume of the sauna room, m3
6-10
Bottom grate
mild steel
Number of flue outlets
1
Flue socket diameter, mm
115
Required temperature class of
chimney
T600
Height, mm
600
Width, mm
440
Depht, mm
510
Weight without stones, kg
23
Load of stones, kg
30-40
Size of stones, cm
Ø5-10
Water tank volume, l
-
Maximum length of wood logs,
cm
25
Max refuelling at a time, kg
1,9
Combustion air setting
Ashpan 10 mm opened

3. Declaration of performance (DoP)
Table 2

4. Installation instructions
Sauna stove shall be installed and operated in accordance with the national legislation and the requirements set out in this manual. If requirements
in national legislation and this manual vary, it is necessary to follow the more stringent requirements.
Sauna stove is intended for heating a sauna. The sauna stove must not be modified without the manufacturer’s consent.
4.1. Before installation
4.1.1.
Suitability of the stove for the sauna
Check the suitability of the stove for the sauna, refer to the minimum and maximum volume of the sauna room (Table 1). The heating of the sauna
room depends on the volume and wall materials of the sauna and the heat output of the stove. Please note, that non-insulated wall materials like
bricks, tiles, concrete, and glass increase the heat output requirements of the stove. To ensure sufficient heat output, for every non-insulated wall
surface (glass, concrete, rock) 2 m3must be added to the volume of the sauna during the calculation. If the sauna walls are made of solid timber,
the volume of the sauna room in cubic meters is multiplied by 1.5.
4.1.2. Initial heating of stove outside
The frame of the Vilpra Sauna stove has been painted with heat-resistant paint. During the initial heating, the painted surfaces of the stove may
smoke and give off harmful substances. Because of this, we recommend that the stove is heated outside for the first time. If heating outside is not
possible, ensure efficient ventilation of the sauna room during the initial heating to reduce odours and harmful fumes. The initial heating is always
done without stones, and a metal tube must be installed on the chimney flue prior to heating (minimum 2 m) so that the draft needed for burning is
created. During the initialheating, 1 to 2 loads of wood should be burned; thus, the corrosion-protectivepreservatives are removed from the surfaces
of the stove.
The heat-resistant paint of the stove reaches its final hardness only during the initial heating. Prior to this, rubbing and wiping of painted surfaces
must be avoided and caution must be followed while moving and treating the stove.
The stove may cause smells of paint in the sauna room, which will, however, disappear within a short period of time.
4.1.3. Ventilation of wood-burning sauna
Efficient ventilation of the sauna room is a requirement for an enjoyable sauna moment. Traditional ventilation may be deployed by having the air
supply to the floor level near the stove and by installing an exhaust valve to the ceiling level, as far as possible away from the stove. The stove itself
circulates the air efficiently, in which case the exhaust valve is only needed mainly to remove moisture after sauna.
The air supply air fed to the floor level moves between the hot inside part and the mantle of the stove. The heated air rises through the stove and
heats the sauna room. Because the burning wood needs plenty of air, the fireplace forms a suction that causes circulation with the rising draught
in the sauna room.

4.2. Protection and safety distances of structures
4.2.1.
Safety distances and functionality of installation location
When situating the stove, the safety distances from the sauna structures must be considered for the sake of preventing fires and operational safety.
The minimum safety distances between the stove and combustible materials are defined during the tests according to EN 15821:2010 (see Table 2).
Sufficient working space around the stove enhances the ease of operation. We recommend at least 1000 mm width and depth of free working
space around the stove. The stove must always be situated a sufficient distance from combustible and sensitive materials. In wall niches, sufficient
ventilation space must be allowed from all walls and at least 125 mm distance between non-combustible materials and the stove.
Note! Electric appliances or wires may not be situated within the safety distances of the stove
4.2.2. Protection of sidewalls
Note! This section gives an example on how the safety distances between the stove and
combustible materials can be reduced by using protection shields. Sauna stove shall be installed
and operated in accordance with the national legislation and the requirements set out in this
manual. If requirements in national legislation and this manual vary, it is necessary to follow the
more stringent requirements.
During installation, the below-mentioned safety distances to wooden walls, sauna benches, and
other combustible materials must be complied with.
4.2.2.1. The distance between vertical surfaces of the stove and unprotected wooden structures
must be at least 200 mm (see Picture 1).
4.2.2.2. The safety distance mentioned above may be reduced by up to 100 mm with single
light protection (see Picture 2). Single light protection is, for example, a non-combustible fibre-
reinforced cement slab with a thickness of at least 7 mm or sheet metal of at least 1 mm that has
been attached to the wall with sufficient density. A ventilation gap of at least 30 mm must be left
between the protected wooden surface and the protective plate.
4.2.2.3.
When installing, a ventilation gap of at least 50 mm must be kept near masonry or other
stone structured walls between vertical surfaces and the walls of the stove (see Picture 3).
Measurement A of Picture 3 is chosen according to the protection method of the wooden surfaces:
Without protection
200 mm
Single light protection
100 mm
Protection structures must not touch the floor or ceiling
For this purpose, a Vilpra Sauna protection for wood stove as an accessory is available for
purchase at a Vilpra Sauna merchant.
4.2.2.4. In the protection of sidewalls, masonry is an option for sheet structures. An equivalent
of the single light protection may be deployed using masonry with a thickness of 55 mm (see
Picture 4). The masonry must be open at the sides and at least 30 mm away from the protected
surface. In addition, it must reach at least 600 mm higher than the upper surface of the stove and
must fulfil the safety distance directive of 200 mm in a lateral direction.

4.2.3. Protection of roof
Separate protection for the roof is not needed if the distance between the upper surface of the
stove and the ceiling (distance F as shown in the Picture 5) is equal or higher to 1200 mm (see
Table 2). If the distance is less than mentioned above, valid fire directives must be complied with.
If needed, contact the fire department of your residential area.
4.2.4. Protection of floor
Items 4.2.2.1. –4.2.2.4 does not apply to the floor in front of the stove if the structure of the floor
has been deployed with non-combustible materials. The floor must be protected with a metal sheet
which is placed tightly against the floor and stove. The protection located at the front of the stove
must reach at least 100 mm to either sides of the stove door and 400 mm to the front of the door,
(see Picture 6).
Valid national fire directives must be complied with. If needed, contact the fire department of your
residential area.
4.2.5. Protection of walls
The inside walls of the sauna must be protected if the wooden walls in the vicinity of the stove are closer than the permitted safety distances, and
the walls are made of combustible materials like panels, planks, or timber. For details of protection, see section 4.2.2. Protection of sidewalls.
It is typical for all wooden surfaces of the sauna room to darken over time - vast changes in temperature speed up the darkening. Darkening may
occur in a short time in a wood preservative-treated wood surface above the stove as many wood preservatives are more vulnerable to higher
temperatures than untreated wood.
The fine-grained materials released from the stone parts of the stove may also darken the wooden surface near the stove. By following this
installation and operation manual of the stove it will ensure that the stove does not heat the surfaces of the sauna room to a dangerously hot level.
The highest permitted temperature for the wall and ceiling surfaces is +145 °C. When choosing the surface material, it is recommended to consider
that all non-insulated glass and stone surfaces increase the power demand requirements of the stove (see section 4.1.1).
4.2.6. Platform of stove
The stove must be placed on a stable, sturdy non-combustible floor platform. The foundation and floor structure must withstand the weight of the
stove and prevent an excessive increase in temperature in the structures surrounding the stove. When there is a wooden floor in the sauna room,
a concrete slab with a thickness of 50 mm or Vilpra Sauna Protection under the wood stove must be used. A tiled floor must, if needed, be protected
before the installation of the stove. For this purpose, a Vilpra Sauna Protection under the wood stove as an accessory is available for purchase at
a Vilpra Sauna merchant.
5
6

4.3. Installation of stove
4.3.1. External tank for water heating
An external tank for water heating may be installed on wood-burning stoves (see Picture 7 and Picture 11). The Vilpra Sauna external tank for
water heating is an accessory that is available for purchase at a Vilpra Sauna merchant.
4.3.2. Stove connection to a chimney
For connection of stove to a chimney follow the safety distances and
protection requirements in the section 4.2. T600 temperature class
connecting flue pipes, flue liners or double wall insulated chimneys must
be used. L-0,33 m, Ø 115 mm chimney connection pipe by which the stove
is connected to the chimney flue is included in the stove package. The
diameter of the chimney shall not be smaller than flue socket diameter of
the stove, it is optimal when diameters are equal. The stove is not suitable
for installation in a shared flue system. Follow installation instructions of
chimney products. The connection of the sauna stove to the chimney and
chimney installation must be made by a qualified installer. For the best
performance, installation of a damper is recommended.
We recommend using Vilpra connecting flue pipes, flue liners or double
wall DW50-M Sauna insulated chimney products. Chimney installation
examples are presented in Pictures 7, 9 to 12.
The gap between the masonry chimney flue and the connection pipe must
be insulated with a fireproof material like mineral wool.
4.3.3. Changing of the opening direction of the door
The opening direction of the stove door may be altered
following steps from 1 to 4 (see Picture 8).
4.3.4. Sauna stones
Ensure that the stove is levelled, and all the adjustable legs are firmly on the floor before inserting sauna stones.
Attention should be paid to the choice of the sauna stones. We recommend stones that are of consistent quality and which both properly and safely
fit for usage on the stoves. If needed, the stone dust must be washed away from the sauna stones prior to placing them on the stove. Place large
stones on the bottom of the stone space in a way that air circulates between the stones. The small stones are placed on the top because they
absorb heat efficiently, even when further away from the heat source. The number of stones, together with the temperature of the sauna, affect the
moisture of the sauna. A larger amount of stones and a lower sauna temperature produce more moisture in the sauna.
Note! Do not use ceramics or stones collected from the wild due to possible erosion, decomposition and harmful compounds.
7

Stove connection to a
masonry chimney with a flue
liner
1.
Combustible material
2.
Non-combustible material
3.
Single wall metal connecting
flue pipe
4.
Double wall Vilpra DW50-M
Sauna chimney (T600 temperature
class)
Stove connection to a double
wall Vilpra DW50-M Sauna
chimney (T600 temperature
class)
1.
Combustible material
2.
Non-combustible material
3.
Single wall metal connecting
flue pipe
4.
Double wall Vilpra DW50-M
Sauna chimney (T600
temperature class)
Stove connection to a double
wall Vilpra DW50-M Sauna
chimney (T600 temperature
class) with external Vilpra
Sauna tank for water heating
1. Combustible material
2.
Non-combustible material
3.
Single wall metal connecting
flue pipe
Safety distances
10
11
12
9

5. Usage of stove
Sauna stove shall be operated in accordance with the national legislation and the requirements set out in this manual. If requirements in national
legislation and this manual vary, it is necessary to follow the more stringent requirements.
5.1. Fuels
Use only dry natural wood logs as a fuel. Maximum refuelling loads and length of wood logs are given in Table 1 and Table 2. The stove must not
be stacked full of wood, avoid overheating the sauna stove. Wood logs must not be stored next to the stove, pay attention to the safety distances.
5.2. Heating the stove
Note! Clean the stove bottom grate and empty the ashpan each time prior to heating the sauna.
Note! Do not heat the stove in a way that the flue pipe glows red, the stove overloads and it shortens the lifespan of the stove.
Note! Parts of the stove, especially the external surfaces, will be hot to touch when in operation and due care is needed to be taken. Use protective
glove, which is included in the package of the stove, for safe manipulation of the stove.
Note! Do not heat the stove without stones, except initial heating of stove outside.
Set the first load of wood loosely by placing the biggest firewood on the bottom and the smaller ones on the top into the firebox, add kindling
between the wood logs and light them. Add the actual refuelling loads when the fire has nearly burned down to embers.
The firebox shall be kept closed except during ignition, refuelling and removal of residue material to prevent fume spillage. Combustion air is brought
into firebox and it is regulated with sliding ashpan. Combustion air settings are given in Table 1. The stove has been designed to perform in most
efficient way when the draught in the flue is as given in Table 2. When the chimney is too long or diameter is too big, this optimal draught limit may
be exceeded. The draught may be adjusted by sliding ashpan or using a damper in case it is installed. A continuous excessive draught will shorten
the lifespan of the stove, as the stove overloads, and the stove becomes red-hot.
After using the sauna, it is recommended to keep a small fire going in the stove to remove moisture from the surfaces of the sauna.
In case of sootfire in the chimney: 1. Slowly close the ashpan and stove door; 2. Contact local fire authority; 3. Do not try to extinguish fire using
water; 4. After a sootfire, the chimney and the stove must be checked by the chimney sweeper before use.
5.3. Sauna water
Clean, fresh water is suitable to be used as sauna water. Ensure that the water is always of sufficient quality: excessive salt, calcium, iron, and
sediments cause corrosion and shorten the lifespan of the stove significantly. Ferrous water may form rust-like spots on the surface of the stove.
Remove the spots by using a stainless steel detergent.
Note! Usage of sea water as sauna water is prohibited. The warranty for the Vilpra Sauna stove does not cover damages resulting from usage of
poor-quality sauna water.
5.4. Sanitation of environment of stove
The stone and metal parts of the stove contain natural features that impact the cleanliness and need for sanitation in the sauna space. It is typical
for the sauna stones to deteriorate over time. Fine granular material may also separate from the steatite that washes away with the sauna water.
The smouldering of the furnace and heat of the stove may also separate minerals and metaldust. Due to the reasons mentioned above, white and
light materials should be kept away from the stove. It also must be ensured that tiling and floor surfaces can endure abrasive materials, high
temperature variations, and have sufficient sanitation. The characteristics mentioned above are features, not defects, and therefore are not covered
by the warranty and liability for damages of the manufacturer.
5.5. Maintenance of stove
The chimney of the stove collects soot and ash over time, which must be removed if needed. Local regulations for chimney sweeping shall be met.
It is typical for sauna stones to disintegrate slowly. Therefore, they must be stacked again once a year, or more often if the sauna is used multiple
times a week. Simultaneously, stone debris collected in the stone space is removed, and crumbled stones are replaced with undamaged ones.
To retain a good draught, the chimney must be swept regularly. The ashpan must be emptied each time prior to heating of the sauna so that the
combustion air through the ashpan cools down the grating, and so ensures a long lifespan. It is recommended to keep a separate ash container
for the ash.
Note! The removed ash may contain burning embers, so store the ash container a sufficient distance from sensitive and combustible materials!
It is recommended to wipe the clear and brushed steel surfaces of the stove with a multi-purpose cleaner to prevent calcium stripes and rust-like
spots.

6. Vilpra Sauna checklist
1. Installation of stove and connection to a chimney:
1.1.
Only use chimney elements designed for this purpose.
1.2.
The metal chimney must not just lean on the stove. Attach the metal chimney to the sauna structures.
1.3.
The stove must only be connected to a suitable chimney.
1.4.
When installing the stove, sufficient distance to structures must be arranged, to ensure free sweeping of the stove.
2.
Initial heating: Smoke and odours
2.1.
The initial heating of the stove is done without stones, preferably outside (using a metal pipe 2 meters in height) or in a sauna room that has
sufficient ventilation. During initial heating, 1 to 2 loads of wood should be burned.
3.
Ensure that every adjustable leg rests firmly on the floor prior to loading the sauna stones.
4.
Sauna stones: Only use suitable washed sauna stones for the purpose. Load the stones again once a year and more often if the sauna is
heated for long periods of time or multiple times a week.
5.
If the side hoods and back of the stove heat up excessively:
5.1.
Check the chimney joints.
5.2.
When heating the stove, a suitable amount of wood must be used in the stove. The stove must not be loaded full of wood –a suitable amount:
not more than 1.9 kg of dry wood at a time and not more than 3,8 kg/h.
6. The ashpan must be emptied, and the grating cleaned each time prior to heating of the sauna.
7.
Sauna water: Preferably, use only clean, fresh drinking water.
8.
If the sauna is left cold in the winter:
8.1.
Remove the stones from the stove.
8.2.
Clean the stone space and grating.
8.3.
Empty the ashpan and water tank.
9.
Fire safety:
9.1.
Ensure the safe installation of the stove by reviewing the latest instructions from the local fire authority prior to installing.
9.2.
Regularly clean the stove, flue gas connector and the chimney flue and check for blockage prior to re-lighting after a prolonged shut down
period.
9.3.
It is recommended for regular maintenance by a competent engineer.
7. Warranty
Vilpra sauna stoves have a manufacturer’s warranty of 36 month after the date of purchase. The warranty cover manufacturing defects. Damages
caused by incorrect use or use which is not in accordance with instructions are not covered by the warranty.
8. For safety
Prior to installing the stove, review the up-to-date safety distances and directives.
The sauna may not be used to dry clothes or as a room to dry laundry.
Beware of the hot stove as the stones and metal parts heat up and become burning hot. Beware of steam rising from the stove, to prevent burns.
We recommend supervision of children, disabled and sick people while using the sauna. Move carefully in the sauna as the benches and floor may
be slippery.
Do not enter the sauna under the influence of alcohol, drugs, or intoxicating agents.
Please note that insufficiently loaded stone space creates a fire risk.
Never cover the stove.
All rights are reserved by UAB Vilpros pramone. All information provided in this manual is owned by UAB Vilpros pramone.
Copying or distribution of the information in this manual without a written consent of UAB Vilpros pramone. is prohibited.