Stuv 21 Series User manual

EN
STÛV 21
INSTALLATION MANUAL
REQUIRED TOOLS REQUIRED HARDWARE
Grinder Hammer
Impact driverLevel
Knife with
retractable blade
Measuring
tape
8 mm
hex socket
5 mm
hex socket
No. 2
square bit
Crowbar
Flat screwdriver
Cutting pliers
Torx 20 bit
10 mm
hex socket
5 mm
hex bit
Torx 25 bit
REQUIRED MATERIAL
Cement board
Stûv handle
Protective fabric
or cardboard
Chimney kit
Wood planks
No. 8
Wood screws
Torx 30 bit
Keep these instructions for future reference
No. 2
phillips bit
T25
5mm 10mm
T30
T20
8mm
5mm
#2 PH2
Floor and wall
finishing
Metal framing
Construction wood

This manual describes a standard installation of a Stûv 21 unit. To install a frame,
a front panel, a linear grille or any other option, it is necessary to respect, when
applicable, certain specificities that are outlined in the appendices provided. If the
appendix is missing, contact customer service and ask for the specific instruction
using the code under the icon.
Look for these symbols. They mean that there is a change compared to a stan-
dard installation. It is very important to review the manual and appendices before
starting and to follow them during installation to ensure no steps are omitted.
Keep all instructions provided at all times, thus ensuring proper and safe installation.
THIN EDGE FRAME
9310400013
PICTURE TYPE FRAME
9310400014
SF4 FRONT PANEL
9310400015
SF5 & SF6 FRONT PANEL
9310400005
SF8 FRONT PANEL
9310400016
LINEAR GRILLE
9310400017
You have chosen a Stûv fireplace ; we thank you for it! It has been designed
to offer maximum pleasure, comfort and safety. The utmost care has been
taken in manufacturing it. If, despite this, you should still find a flaw, please
contact your dealer.
THANK YOU APPENDICES
2
STÛV 21
IMPORTANT
Before installing this Stûv unit, contact the local authorities and/or your
insurance company to obtain a building permit and inquire about all the
requirements that need to be met.
For information on all the applicable regulatory requirements, contact your
local fire department before starting the installation.
!

1. CERTIFICATION 4
1.1 Safety Instructions
1.2 Technical Specifications
1.3 Marking labels
5
6
7
2. COMPONENTS 8
2.1 List of components
2.2 Convection Kit
2.3 Optional Kits
9
12
13
REQUIRED HARDWARE
6. USE 51
7. MAINTENANCE 56
REQUIRED HARDWARE
8. WARRANTY 65
6.1 Wood selection
6.2 Do not use
6.3 Firescreen
6.4 Starting the fire
6.5 Reloading the fire
6.6 Ash Removal
7.1 Regular maintenance
7.2 Annual maintenance
7.3 Creosote and chimney-sweeping
7.4 Pulleys and counterweights
7.5 Components replacement
57
57
59
59
60
8.1 Warranty details
8.2 Warranty form
66
67
3. DIMENSIONS 14
3.1 Simple face
3.2 Double face
3.3 R value
3.4 Floor protection
3.5 Framework characteristics
3.6 Non-combustible material
3.7 Air Supply
3.8 Fitted television
3.9 Shelf made of combustible material
3.10 Hearth extension
3.11 Corner installation
3.12 Risk area
3.13 Example installation
15
16
17
17
18
18
19
19
20
20
21
23
23
REQUIRED HARDWARE
4. INSTALLATION 24
4.1 Unpacking
4.2 Option: Adjustable stands
4.3 Option: Airtight box
4.4 Convection kit
4.5 Glass cavity and pulleys
4.6 Preparing for convection
4.7 Wall Insertion
4.8 Convection Installation
4.9 Refractory bricks
4.10 Baffles and vermiculites
4.11 Finishing without a front panel
4.12 Recap
5. CHIMNEY 47
5.1 Dimensions and certification
5.2 Typical installation
5.3 Masonry Chimney
STÛV21 3
TABLE OF CONTENTS
52
53
53
54
55
55
25
27
29
31
32
34
38
39
41
43
45
46
48
49
50

1
CERTIFICATION
1.1 SAFETY INSTRUCTIONS .................................................................................................................. 5
1.2 TECHNICAL SPECIFICATIONS ........................................................................................................ 6
1.3 MARKING LABELS ............................................................................................................................ 7

5
1
CERTIFICATIONSTÛV 21
.1 SAFETY INSTRUCTIONS
Tested and certified by CSA
as for standard:
ULC-S610:2018 & UL 127 - 9th Edition
EPA Not applicable for decorative wood burning fireplaces
CHIMNEY TYPE : UL-103HT or ULC-S629
This wood heater must be installed in
accordance with standard CSA B365
(Canada) or N.F.P.A. 211 (United
States), the Installation Code for
Solid-Fuel-Burning Appliances and
Equipment, the applicable building
code and standards applicable to
the structure in which the insert will be
installed.
The instructions for the installation
of this wood heater comply with the
above-mentioned standards. They
must be closely followed to eliminate
the risk of serious problems.
This Stûv unit must be installed by
a qualified professional. Improper
installation could result in a fire.
To reduce the risk of fire, read this
manual carefully before installing or
using the wood heater. If the installation
instructions are not followed and the
wood heater is improperly installed, the
risk of incident increases. This can result
in fire, property damage, bodily injury
and even death.
Keep these instructions for future
reference.
NOTE
We strongly recommend that our products be installed
and maintained by professionals certified by the
Association des Professionnels du Chauffage if you are
in Quebec or by Wood Energy Technical Training for the
rest of Canada, and by the National Fireplace Institute
in the United States.
!
This Stûv fireplace must be registered to be covered by the
warranty. Please refer to the last section of this document for
guidance.
The marking label is located on the cap shown above. The
product serial number can be found on the riveted label above
the hearth. You will find all the information you need to register
your product.
Serial #
Details p.7
Marking
label
USC

6
1
CERTIFICATIONSTÛV 21
.1 SAFETY INSTRUCTIONS
1. It is essential that the installation of
this Stûv be carried out by a qualified
professional. For all applicable regulatory
requirements, contact the local fire
department before beginning work.
2. The instructions for the installation of this
unit comply with the abovementioned
standards. They must be closely followed
to eliminate the risk of serious problems.
Any use contrary to the user manual is a
violation of federal law.
3. Improper installation of this Stûv unit
could result in a fire. To reduce the risk of
fire, follow the installation instructions to
the letter. Failure to follow the instructions
in this manual may result in property
damage, bodily injury or death.
4. This unit requires periodic inspection
and maintenance for proper operation
(minimum three times during the heating
season).
5. Any modifications made to this unit may
pose a hazard and will void the warranty.
Should repairs be necessary, use only Stûv
replacement parts.
6. Combustible materials such as firewood,
wet clothing, etc. placed too close to the
unit could catch fire.
7. We recommend storing solid fuels in a
clean, dry environment. Do not place this
type of fuel within the risk area or in the
loading/ash removal area.
8. Never use the fireplace with the door open
unless it is equipped with a firescreen
(available as an option).
9. Never leave the fireplace unattended
when the door is open.
10. Always close the door after the ignition
period.
11. Do not burn garbage, plastic, petroleum-
based materials, gasoline, rubber,
industrial solvents, flammable liquids
such as naphtha and motor oil, paper,
cardboard, wood extracted from salt
water and dried, painted wood or any
substance that emit dense fumes and
strong odours.
12. Make sure the home is equipped with a
smoke and carbon monoxide detector.
13. Do not connect this appliance to a
chimney flue serving another appliance.
14. This unit is hot when in use. Keep children,
clothing and furniture at a safe distance.
Touching the appliance while it is in
operation may cause burns.
15. Some parts of the fireplace can be very
hot when operated at rated capacity.
16. Do not allow the fireplace to heat to the
point where parts become red.
17. Do not use a grate or other methods to
elevate the fuel. Burn firewood directly on
the firebricks.
18. Do not overheat the unit. Attempting to
exceed the single burn rate of this unit
may permanently damage it.
19. Conduct regular maintenance of the
fireplace as previously recommended.
20. Never use chemicals or other liquids such
as gasoline, gasoline-based lantern fuel,
kerosene, charcoal liquid, or similar liquids
to start or feed a fire in the fireplace. Keep
all such liquids away from the unit while it is
in operation.
21. Do not install this unit in a mobile home.
22. The air inlets and outlets must remain free
of obstacles at all times.
23. The installation of the unit must comply
with all local and national regulations.
24. Inspect and sweep the chimney frequently.
In certain operating conditions, creosote
can build up quickly. Inspect and repair the
insert to ensure proper operation.
25. Objects placed in front of the unit must be
kept at a distance of at least 48"(4’) from
the unit’s glass face.
CAUTION
!
DOUBLE FACE 21-85 DF 21-95 DF 21-125 DF
Maximum power BTU 48 000 55 000 60 000
Performance 72% < 70% < 70%
Fines particule emission EPA Not applicable for decorative wood burning fireplaces
Max log length 24" 28" 40"
Weight 752 lbs 855 lbs 960 lbs
Combustion chamber volume 6.47 pi38.4 pi310.61 pi3
Wood consumption⁄H 13-15 lbs 13-15 lbs 13-15 lbs
Maximum wood⁄H concomption
(to avoid overheating) 28 lbs 28 lbs 28 lbs
Fuel WOOD
SIMPLE FACE 21-85 SF 21-95 SF 21-105 SF 21-125 SF
Maximum power BTU 48 000 55 000 48 000 60 000
Performance 77% < 70% 77% < 70%
Fines particule emission EPA Not applicable for decorative wood burning fireplaces
Max log length 24" 28" 32" 40"
Weight 665 lbs 820 lbs 688 lbs 892 lbs
Combustion chamber volume 4.77 pi36.58 pi35.28 pi38.38 pi3
Wood consumption⁄H 12-14 lbs 13-15 lbs 12-14 lbs 13-15 lbs
Maximum wood⁄H concomption
(to avoid overheating) 26 lbs 28 lbs 26 lbs 28 lbs
Fuel WOOD
.2 TECHNICAL SPECIFICATIONS
1

7
1
CERTIFICATIONSTÛV 21
.3 MARKING LABELS
MODELS/MODÈLES: STÛV
21-75 DF, 21-85 DF
MANUFACTURED BY / FABRIQUÉ PAR :
STÛV S.A. rue Jules Borbouse 4
B-5170 Bois-de-Villers, Belgium [stuv.be]
PW9310302900_R6
LABEL NO. / NO. D’ÉTIQUETTE : 000 000
2022
DATE OF MANUFACTURE / DATE DE FABRICATION
JAN FEB MAR APR
2023 MAY JUN JUL AUG
2024 SEP OCT NOV DEC
Clearance to combustible materials using the Stûv insulated shell /
Dégagement aux matériaux combustibles utilisant le caisson isolé Stûv :
SIDE WALL / PAROIS LATÉRALES : 0 mm ( 0")
BACK WALL / MUR ARRIÈRE : N/A
CEILING / PLAFOND : 1,98 m ( 78")
Couvrir le plancher de 2 épaisseurs de panneaux de fibrociment /".
SUIVRE LES INSTRUCTIONS D’INSTALLATION DU MANUEL DE
L’UTILISATEUR POUR LES DÉTAILS.
Cover floor using 2 layers of /" fibrocement board.
FOLLOW THE INSTALLATION INSTRUCTIONS IN THE
OWNER’S MANUAL FOR DETAILS.
Do not use a fireplace insert or other products not specified for use with
this product.
Ne pas utiliser d’encastrables ou autres produits non spécifiés avec ce foyer.
DO NOT REMOVE THIS LABEL / NE PAS RETIRER CETTE ÉTIQUETTE
CERTIFIED AND CONFORMS TO :
CERTIFIÉ CONFORMÉMENT SELON :
ULC-S610 : 2018 & UL 127 - 9th Edition,
U.S. ENVIRONMENTAL PROTECTION AGENCY
Not affected wood heaters / Non applicable aux foyers aux bois
LISTED FACTORY BUILT FIREPLACE
NOT SUITABLE FOR MOBILE HOME INSTALLATION.
Certified for use in Canada and United-States.
FOYER HOMOLOGUÉ CONSTRUIT EN USINE
NE PAS INSTALLER DANS UNE MAISON MOBILE.
Usage homologué au Canada et aux États-Unis.
CHIMNEY TYPE (See manual for appropriate choice)
Use only a 10 inch insulated chimney listed per
ULC-S629 ou UL-103HT.
TYPE DE CHEMINÉE (Voir le manuel d’instruction pour les bons choix)
Utiliser uniquement une cheminée de 10 pouces isolée
répertoriée selon la norme ULC-S629 ou UL-103HT
MADE IN BELGIUM / FABRIQUÉ EN BELGIQUE
- Fuel : Cord wood Only.
- Floor must be protected as specified in the manual. For safe
operation, install in accordance with the manufacturer's instructions.
- Replace glass only with Stûv's ceramic glass 4 mm thick.
- Do not operate unit with door open exept by using a screen.
- Components used with fireplace must be listed. See manual.
- Contact your local building or fire officials about restrictions
and installation inspections in your area.
- Unit must be connected to a minimum of 2 ambiant-air inlet
and 2 hot-air outlet using 6" flexible insulated system (Stûv).
- Do not obstruct air inlet and outlet in any case.
- Refer to manual for optional components.
- Do not connect this unit to a chimney flue serving another appliance.
- Inspect and clean chimney frequently - Under certain conditions of
use, creosote buildup may occur rapidly. Do not overfire unit.
- CAUTION When a fire is burning in the fireplace, fresh air must be
supplied to the room where the fireplace is located. Failure to
provide this may starve other fuel burning appliance from an
adequate air supply.
- Combustible : Bois de corde seulement.
- Le plancher doit être protégé tel que spécifié dans le manuel. Pour un
fonctionnement sécuritaire, installez conformément aux directives du fabricant.
- Remplacez le verre uniquement par un verre de céramique Stûv 4 mm d'épais.
- Ne pas utiliser l'appareil la porte ouverte sauf utilisant un pare-étincelles.
- Les composants utilisés dans l'appareil doivent être répertoriés. Voir manuel.
- Communiquez avec les autorités locales en matière de construction
ou d'incendie pour connaître les restrictions et inspections d'installation dans
votre région.
- Cet appareil doit être raccordé à un minimum de 2 entrées d'air ambient et 2
sorties d'air chaud avec des conduits flexible 6" isolés (Stûv).
- Ne pas obstruer les entrées et sorties d'air en aucun cas.
- Ne reliez pas cet appareil à un conduit de cheminée servant un autre appareil.
- Inspectez et nettoyez la cheminée fréquemment - Dans certaines conditions
d'utilisation, l’accumulation de créosote peut se faire rapidement.
- Ne pas surchauffer l'appareil.
- ATTENTION : Lorsque le foyer brûle, un apport d'air supplémentaire doit être
prévu dans la pièce. Un manque d'air d'appoint pourrait priver les autres
appareils de combustion d'une alimentation d'air adéquate.
USC
MODELS/MODÈLES: STÛV
21-95 DF, 21-125 DF
MANUFACTURED BY / FABRIQUÉ PAR :
STÛV S.A. rue Jules Borbouse 4
B-5170 Bois-de-Villers, Belgium [stuv.be]
LABEL NO. / NO. D’ÉTIQUETTE : 000 000
Clearance to combustible materials using the Stûv insulated shell /
Dégagement aux matériaux combustibles utilisant le caisson isolé Stûv :
SIDE WALL / PAROIS LATÉRALES : 0 mm ( 0")
BACK WALL / MUR ARRIÈRE : N/A
CEILING / PLAFOND : 1,98 m ( 78")
Couvrir le plancher de 2 épaisseurs de panneaux de fibrociment /".
SUIVRE LES INSTRUCTIONS D’INSTALLATION DU MANUEL DE
L’UTILISATEUR POUR LES DÉTAILS.
Cover floor using 2 layers of /" fibrocement board.
FOLLOW THE INSTALLATION INSTRUCTIONS IN THE
OWNER’S MANUAL FOR DETAILS.
Do not use a fireplace insert or other products not specified for use with
this product.
Ne pas utiliser d’encastrables ou autres produits non spécifiés avec ce foyer.
DO NOT REMOVE THIS LABEL / NE PAS RETIRER CETTE ÉTIQUETTE
CERTIFIED AND CONFORMS TO :
CERTIFIÉ CONFORMÉMENT SELON :
ULC-S610 : 2018 & UL 127 - 9th Edition,
U.S. ENVIRONMENTAL PROTECTION AGENCY
Not affected wood heaters / Non applicable aux foyers aux bois
LISTED FACTORY BUILT FIREPLACE
NOT SUITABLE FOR MOBILE HOME INSTALLATION.
Certified for use in Canada and United-States.
FOYER HOMOLOGUÉ CONSTRUIT EN USINE
NE PAS INSTALLER DANS UNE MAISON MOBILE.
Usage homologué au Canada et aux États-Unis.
CHIMNEY TYPE (See manual for appropriate choice)
Use only a 12 inch insulated chimney listed per
ULC-S629 ou UL-103HT.
TYPE DE CHEMINÉE (Voir le manuel d’instruction pour les bons choix)
Utiliser uniquement une cheminée de 12 pouces isolée
répertoriée selon la norme ULC-S629 ou UL-103HT
MADE IN BELGIUM / FABRIQUÉ EN BELGIQUE
- Fuel : Cord wood Only.
- Floor must be protected as specified in the manual. For safe
operation, install in accordance with the manufacturer's instructions.
- Replace glass only with Stûv's ceramic glass 4 mm thick.
- Do not operate unit with door open exept by using a screen.
- Components used with fireplace must be listed. See manual.
- Contact your local building or fire officials about restrictions
and installation inspections in your area.
- Unit must be connected to a minimum of 2 ambiant-air inlet
and 2 hot-air outlet using 6" flexible insulated system (Stûv).
- Do not obstruct air inlet and outlet in any case.
- Refer to manual for optional components.
- Do not connect this unit to a chimney flue serving another appliance.
- Inspect and clean chimney frequently - Under certain conditions of
use, creosote buildup may occur rapidly. Do not overfire unit.
- CAUTION When a fire is burning in the fireplace, fresh air must be
supplied to the room where the fireplace is located. Failure to
provide this may starve other fuel burning appliance from an
adequate air supply.
- Combustible : Bois de corde seulement.
- Le plancher doit être protégé tel que spécifié dans le manuel. Pour un
fonctionnement sécuritaire, installez conformément aux directives du fabricant.
- Remplacez le verre uniquement par un verre de céramique Stûv 4 mm d'épais.
- Ne pas utiliser l'appareil la porte ouverte sauf utilisant un pare-étincelles.
- Les composants utilisés dans l'appareil doivent être répertoriés. Voir manuel.
- Communiquez avec les autorités locales en matière de construction
ou d'incendie pour connaître les restrictions et inspections d'installation dans
votre région.
- Cet appareil doit être raccordé à un minimum de 2 entrées d'air ambient et 2
sorties d'air chaud avec des conduits flexible 6" isolés (Stûv).
- Ne pas obstruer les entrées et sorties d'air en aucun cas.
- Ne reliez pas cet appareil à un conduit de cheminée servant un autre appareil.
- Inspectez et nettoyez la cheminée fréquemment - Dans certaines conditions
d'utilisation, l’accumulation de créosote peut se faire rapidement.
- Ne pas surchauffer l'appareil.
- ATTENTION : Lorsque le foyer brûle, un apport d'air supplémentaire doit être
prévu dans la pièce. Un manque d'air d'appoint pourrait priver les autres
appareils de combustion d'une alimentation d'air adéquate.
PW9310303000_R6
2022
DATE OF MANUFACTURE / DATE DE FABRICATION
JAN FEB MAR APR
2023 MAY JUN JUL AUG
2024 SEP OCT NOV DEC
USC
MODELS/MODÈLES: STÛV
21-65H*, 21-75*, 21-85, 21-105 SF
MANUFACTURED BY / FABRIQUÉ PAR :
STÛV S.A. rue Jules Borbouse 4
B-5170 Bois-de-Villers, Belgium [stuv.be]
LABEL NO. / NO. D’ÉTIQUETTE : 000 000
Clearance to combustible materials using the Stûv insulated shell /
Dégagement aux matériaux combustibles utilisant le caisson isolé Stûv :
SIDE WALL / PAROIS LATÉRALES: 0 mm ( 0")
BACK WALL / MUR ARRIÈRE: 0 mm ( 0")
CEILING / PLAFOND: 1,98 m ( 78")
Couvrir le plancher de 2 épaisseurs de panneaux de fibrociment /".
SUIVRE LES INSTRUCTIONS D’INSTALLATION DU MANUEL DE
L’UTILISATEUR POUR LES DÉTAILS.
Cover floor using 2 layers of /" fibrocement board.
FOLLOW THE INSTALLATION INSTRUCTIONS IN THE
OWNER’S MANUAL FOR DETAILS.
Do not use a fireplace insert or other products not specified for use with
this product.
Ne pas utiliser d’encastrables ou autres produits non spécifiés avec ce foyer.
DO NOT REMOVE THIS LABEL / NE PAS RETIRER CETTE ÉTIQUETTE
* models 21.65H-SF & 21.75-SF may not be sold or operated within the United States.
CERTIFIED AND CONFORMS TO :
CERTIFIÉ CONFORMÉMENT SELON :
ULC-S610 : 2018 & UL 127 - 9th Edition,
U.S. ENVIRONMENTAL PROTECTION AGENCY
Not affected wood heaters / Non applicable aux foyers aux bois
LISTED FACTORY BUILT FIREPLACE
NOT SUITABLE FOR MOBILE HOME INSTALLATION.
Certified for use in Canada and United-States.
FOYER HOMOLOGUÉ CONSTRUIT EN USINE
NE PAS INSTALLER DANS UNE MAISON MOBILE.
Usage homologué au Canada et aux États-Unis.
CHIMNEY TYPE (See manual for appropriate choice)
Use only a 8 inch insulated chimney listed per
ULC-S629 ou UL-103HT.
TYPE DE CHEMINÉE (Voir le manuel d’instruction pour les bons choix)
Utiliser uniquement une cheminée de 8 pouces isolée
répertoriée selon la norme ULC-S629 ou UL-103HT
MADE IN BELGIUM / FABRIQUÉ EN BELGIQUE
- Fuel : Cord wood Only.
- Floor must be protected as specified in the manual. For safe
operation, install in accordance with the manufacturer's instructions.
- Replace glass only with Stûv's ceramic glass 4 mm thick.
- Do not operate unit with door open exept by using a screen.
- Components used with fireplace must be listed. See manual.
- Contact your local building or fire officials about restrictions
and installation inspections in your area.
- Unit must be connected to a minimum of 2 ambiant-air inlet
and 2 hot-air outlet using 6" flexible insulated system (Stûv).
- Do not obstruct air inlet and outlet in any case.
- Refer to manual for optional components.
- Do not connect this unit to a chimney flue serving another appliance.
- Inspect and clean chimney frequently - Under certain conditions of
use, creosote buildup may occur rapidly. Do not overfire unit.
- CAUTION When a fire is burning in the fireplace, fresh air must be
supplied to the room where the fireplace is located. Failure to
provide this may starve other fuel burning appliance from an
adequate air supply.
- Combustible : Bois de corde seulement.
- Le plancher doit être protégé tel que spécifié dans le manuel. Pour un
fonctionnement sécuritaire, installez conformément aux directives du fabricant.
- Remplacez le verre uniquement par un verre de céramique Stûv 4 mm d'épais.
- Ne pas utiliser l'appareil la porte ouverte sauf utilisant un pare-étincelles.
- Les composants utilisés dans l'appareil doivent être répertoriés. Voir manuel.
- Communiquez avec les autorités locales en matière de construction
ou d'incendie pour connaître les restrictions et inspections d'installation dans
votre région.
- Cet appareil doit être raccordé à un minimum de 2 entrées d'air ambient et 2
sorties d'air chaud avec des conduits flexible 6" isolés (Stûv).
- Ne pas obstruer les entrées et sorties d'air en aucun cas.
- Ne reliez pas cet appareil à un conduit de cheminée servant un autre appareil.
- Inspectez et nettoyez la cheminée fréquemment - Dans certaines conditions
d'utilisation, l’accumulation de créosote peut se faire rapidement.
- Ne pas surchauffer l'appareil.
- ATTENTION : Lorsque le foyer brûle, un apport d'air supplémentaire doit être
prévu dans la pièce. Un manque d'air d'appoint pourrait priver les autres
appareils de combustion d'une alimentation d'air adéquate.
PW9310303100_R6
2022
DATE OF MANUFACTURE / DATE DE FABRICATION
JAN FEB MAR APR
2023 MAY JUN JUL AUG
2024 SEP OCT NOV DEC
USC
MODELS/MODÈLES: STÛV
21-95 SF, 21-125 SF, 21-135 SF
MANUFACTURED BY / FABRIQUÉ PAR :
STÛV S.A. rue Jules Borbouse 4
B-5170 Bois-de-Villers, Belgium [stuv.be]
LABEL NO. / NO. D’ÉTIQUETTE : 000 000
Clearance to combustible materials using the Stûv insulated shell /
Dégagement aux matériaux combustibles utilisant le caisson isolé Stûv :
SIDE WALL / PAROIS LATÉRALES: 0 mm ( 0")
BACK WALL / MUR ARRIÈRE: 0 mm ( 0")
CEILING / PLAFOND: 1,98 m ( 78")
Couvrir le plancher de 2 épaisseurs de panneaux de fibrociment /".
SUIVRE LES INSTRUCTIONS D’INSTALLATION DU MANUEL DE
L’UTILISATEUR POUR LES DÉTAILS.
Cover floor using 2 layers of /" fibrocement board.
FOLLOW THE INSTALLATION INSTRUCTIONS IN THE
OWNER’S MANUAL FOR DETAILS.
Do not use a fireplace insert or other products not specified for use with
this product.
Ne pas utiliser d’encastrables ou autres produits non spécifiés avec ce foyer.
DO NOT REMOVE THIS LABEL / NE PAS RETIRER CETTE ÉTIQUETTE
CERTIFIED AND CONFORMS TO :
CERTIFIÉ CONFORMÉMENT SELON :
ULC-S610 : 2018 & UL 127 - 9th Edition,
U.S. ENVIRONMENTAL PROTECTION AGENCY
Not affected wood heaters / Non applicable aux foyers aux bois
LISTED FACTORY BUILT FIREPLACE
NOT SUITABLE FOR MOBILE HOME INSTALLATION.
Certified for use in Canada and United-States.
FOYER HOMOLOGUÉ CONSTRUIT EN USINE
NE PAS INSTALLER DANS UNE MAISON MOBILE.
Usage homologué au Canada et aux États-Unis.
CHIMNEY TYPE (See manual for appropriate choice)
Use only a 10 inch insulated chimney listed per
ULC-S629 ou UL-103HT.
TYPE DE CHEMINÉE (Voir le manuel d’instruction pour les bons choix)
Utiliser uniquement une cheminée de 10 pouces isolée
répertoriée selon la norme ULC-S629 ou UL-103HT
MADE IN BELGIUM / FABRIQUÉ EN BELGIQUE
- Fuel : Cord wood Only.
- Floor must be protected as specified in the manual. For safe
operation, install in accordance with the manufacturer's instructions.
- Replace glass only with Stûv's ceramic glass 4 mm thick.
- Do not operate unit with door open exept by using a screen.
- Components used with fireplace must be listed. See manual.
- Contact your local building or fire officials about restrictions
and installation inspections in your area.
- Unit must be connected to a minimum of 2 ambiant-air inlet
and 2 hot-air outlet using 6" flexible insulated system (Stûv).
- Do not obstruct air inlet and outlet in any case.
- Refer to manual for optional components.
- Do not connect this unit to a chimney flue serving another appliance.
- Inspect and clean chimney frequently - Under certain conditions of
use, creosote buildup may occur rapidly. Do not overfire unit.
- CAUTION When a fire is burning in the fireplace, fresh air must be
supplied to the room where the fireplace is located. Failure to
provide this may starve other fuel burning appliance from an
adequate air supply.
- Combustible : Bois de corde seulement.
- Le plancher doit être protégé tel que spécifié dans le manuel. Pour un
fonctionnement sécuritaire, installez conformément aux directives du fabricant.
- Remplacez le verre uniquement par un verre de céramique Stûv 4 mm d'épais.
- Ne pas utiliser l'appareil la porte ouverte sauf utilisant un pare-étincelles.
- Les composants utilisés dans l'appareil doivent être répertoriés. Voir manuel.
- Communiquez avec les autorités locales en matière de construction
ou d'incendie pour connaître les restrictions et inspections d'installation dans
votre région.
- Cet appareil doit être raccordé à un minimum de 2 entrées d'air ambient et 2
sorties d'air chaud avec des conduits flexible 6" isolés (Stûv).
- Ne pas obstruer les entrées et sorties d'air en aucun cas.
- Ne reliez pas cet appareil à un conduit de cheminée servant un autre appareil.
- Inspectez et nettoyez la cheminée fréquemment - Dans certaines conditions
d'utilisation, l’accumulation de créosote peut se faire rapidement.
- Ne pas surchauffer l'appareil.
- ATTENTION : Lorsque le foyer brûle, un apport d'air supplémentaire doit être
prévu dans la pièce. Un manque d'air d'appoint pourrait priver les autres
appareils de combustion d'une alimentation d'air adéquate.
PW9310303200_R6
2022
DATE OF MANUFACTURE / DATE DE FABRICATION
JAN FEB MAR APR
2023 MAY JUN JUL AUG
2024 SEP OCT NOV DEC
USC

2
COMPONENTS
2.1 LIST OF COMPONENTS ................................................................................................................ 9
2.2 CONVECTION KIT ........................................................................................................................ 12
2.3 OPTIONAL KITS .......................................................................................................................... 13

9
2
COMPONENTSSTÛV 21
.1 LIST OF COMPONENTS
Option
1
2
3
4
5
710
8
6
9
11
6
2
3
4
7
11
10
8
9
1
5
SIMPLE FACE (SF) See table for code and description DOUBLE FACE (DF) See table for code and description
Option

10
2
COMPONENTSSTÛV 21
.1 LIST OF COMPONENTS
21-85 SF FW1002102300 21-95 SF FW1002102700
21-105 SF FW1002102400 21-125 SF FW1002102800
# DESCRIPTION PRODUCT
CODE
INCLUDED
OR OPTION QTY
1 Fireplace N/A Included 1
2 Insulated shell N/A Included 1
3 Hearth finishing trims N/A Included
1
2
1
4 Horizontal finishing trims N/A Included 2
1
5 Wool support plate N/A Included 1
6 Hot air outlet (convection kit) PV1200200010 Included 2
7 Cold air intlet (convection kit) PW1200200005 Included 2
8 Outside air kit AW1200200001 Option 1
9 Air damper 4" AW1200100300 Option 1
10 Airtight box AW1200202700 Option 1
11 Adjustable stand AW1300200000 Option 1
# DESCRIPTION PRODUCT
CODE
INCLUDED
OR OPTION QTY
1 Fireplace N/A Included 1
2 Insulated shell N/A Included 1
3 Hearth finishing trims N/A Included
1
2
1
4 Horizontal finishing trims N/A Included 2
1
5 Wool support plate N/A Included 1
6 Hot air outlet (convection kit) PV1200200010 Included 2
7 Cold air intlet (convection kit) PW1200200005 Included 2
8 Outside air kit AW1200200001 Option 1
9 Air damper 4" AW1200100300 Option 1
10 Airtight box AW1200206500 Option 1
11 Adjustable stand AW1300200000 Option 1
# DESCRIPTION PRODUCT
CODE
INCLUDED
OR OPTION QTY
1 Fireplace N/A Included 1
2 Insulated shell N/A Included 1
3 Hearth finishing trims N/A Included
1
2
1
4 Horizontal finishing trims N/A Included 2
1
5 Wool support plate N/A Included 1
6 Hot air outlet (convection kit) PV1200200010 Included 2
7 Cold air intlet (convection kit) PW1200200005 Included 2
8 Outside air kit AW1200200001 Option 1
9 Air damper 4" AW1200100300 Option 1
10 Airtight box AW1200203600 Option 1
11 Adjustable stand AW1300200000 Option 1
# DESCRIPTION PRODUCT
CODE
INCLUDED
OR OPTION QTY
1 Fireplace N/A Included 1
2 Insulated shell N/A Included 1
3 Hearth finishing trims N/A Included
1
2
1
4 Horizontal finishing trims N/A Included 2
1
5 Wool support plate N/A Included 1
6 Hot air outlet (convection kit) PV1200200010 Included 2
7 Cold air intlet (convection kit) PW1200200005 Included 2
8 Outside air kit AW1200200001 Option 1
9 Air damper 4" AW1200100300 Option 1
10 Airtight box AW1200202800 Option 1
11 Adjustable stand AW1300200000 Option 1

11
2
COMPONENTSSTÛV 21
.1 LIST OF COMPONENTS
21-85 DF FW1002103000 21-95 DF
FW100210310021-85 DF FW1002103000 21-95 DF FW1002103100
21-125 DF FW1002103200
# DESCRIPTION PRODUCT
CODE
INCLUDED
OR OPTION QTY
1 Fireplace N/A Included 1
2 Insulated shell N/A Included 1
3 Hearth finishing trims N/A Included
2
4
2
4 Horizontal finishing trims N/A Included 4
2
5 Wool support plate N/A Included 1
6 Hot air outlet (convection kit) PV1200200010 Included 2
7 Cold air intlet (convection kit) PW1200200005 Included 2
8 Outside air kit AW1200200001 Option 1
9 Air damper 6" AW1200100200 Option 1
10 Airtight box AW1200206501 Option 2
11 Adjustable stand AW1300200000 Option 1
# DESCRIPTION PRODUCT
CODE
INCLUDED
OR OPTION QTY
1 Fireplace N/A Included 1
2 Insulated shell N/A Included 1
3 Hearth finishing trims N/A Included
2
4
2
4 Horizontal finishing trims N/A Included 4
2
5 Wool support plate N/A Included 1
6 Hot air outlet (convection kit) PV1200200010 Included 2
7 Cold air intlet (convection kit) PW1200200005 Included 2
8 Outside air kit AW1200200001 Option 1
9 Air damper 6" AW1200100200 Option 1
10 Airtight box AW1200203601 Option 2
11 Adjustable stand AW1300200000 Option 1
# DESCRIPTION PRODUCT
CODE
INCLUDED
OR OPTION QTY
1 Fireplace N/A Included 1
2 Insulated shell N/A Included 1
3 Hearth finishing trims N/A Included
2
4
2
4 Horizontal finishing trims N/A Included 4
2
5 Wool support plate N/A Included 1
6 Hot air outlet (convection kit) PV1200200010 Included 2
7 Cold air intlet (convection kit) PW1200200005 Included 2
8 Outside air kit AW1200200001 Option 1
9 Air damper 4" AW1200100300 Option 1
10 Airtight box AW1200202701 Option 2
11 Adjustable stand AW1300200000 Option 1
SF DF

12
2
COMPONENTSSTÛV 21
.2 CONVECTION KIT
Installation p.39
Installation p.39
GRILLE To be fixed on the grille boxes
GRILLE BOXES For air outlets and intakes AIR DUCTS For convection
Installation p.31
10 ⁄"
12 ⁄"
7"
5"
½"
5½"
Ø 6'' 2"
10 ⁄"
12 ⁄"
5"
½"
6"
2"
Ø 6''
COLD Air
HOT Air
GRILLE BOX
PW1200200008
GRILLE BOX
PV1200200002
5 ⁄"
11"
⁄"
9 ¾"
4 ¾"
¾"
28 in2
GRILLE
PV1200200006
Ø 6"
H : 3'' H : 20'' H : 10' H : 10'
COLD Air HOT Air
INSULATED DUCT
PV1200200010
DUCT
PW1200200005
LONG FLANGE
PV1200200009
SHORT FLANGE
PV1200200003
MAXCLIP
PV1200200011

13
2
COMPONENTSSTÛV 21
.3 OPTIONAL KITS (NOT INCLUDED)
AIRTIGHT BOX For outside air intake OUTSIDE AIR KIT
Installation p.29
This part is inside
the fireplace
Installation p.27 Follow the instructions supplied with the air damper.
Follow the instructions supplied with the air damper.
ADJUSTABLE STAND To raise the unit AIR DAMPER For outside air intake
5’’ or 6 1/4’’
1"
1"
+/-1 ½"
7 ¼"
18 ⁄"
24 ⁄"
21-85 23 ¾"
21-95 27 ⁄"
21-105 29 ⁄"
21-125 37 ½"
WIRE
4’
THREADED ROD
M10 x 3 ½’’
HANDLE
1’’ x ⁄’’
NUT
M10
WASHER
M10
FINISHING WASHER
M5 int.
Ø
4" ou 6"
Ø4"
Ø 4"
It is recommended for 21-95 DF et 21-125 DF models to use
a ø6" outside air kit (not provided by Stûv America)

3
DIMENSIONS
3.1 SIMPLE FACE .............................................................................................................................. 15
3.2 DOUBLE FACE ............................................................................................................................. 16
3.3 R VALUE ....................................................................................................................................... 17
3.4 FLOOR PROTECTION ................................................................................................................ 17
3.5 FRAMEWORK CHARACTERISTICS ......................................................................................... 18
3.6 NON COMBUSTIBLE MATERIAL .............................................................................................. 18
3.7 AIR SUPPLY ................................................................................................................................ 19
3.8 FITTED TELEVISION .................................................................................................................. 19
3.9 CORNER INSTALLATION .......................................................................................................... 20
3.10 HEARTH EXTENSION ................................................................................................................ 20
3.11 SHELF MADE OF COMBUSTIBLE MATERIAL ......................................................................... 21
3.12 RISK AREA ................................................................................................................................... 23
3.13 INSTALLATION EXAMPLE ........................................................................................................ 23

15
3
DIMENSIONSSTÛV 21
.1 SIMPLE FACE
FRONT VIEW BACK VIEW SIDE VIEW TOP VIEW BOTTOM VIEW
6"
i
H
ø 6"
Anchor
plate
G
F
E
B
C
A
D
4 / "
5 / "
R
TS
P
Q
O
U
ø 6 ¼"
ø V
3 ¾"
J
K
¼"
L
M
FRONT
VIEW A B C D E F G
21-85 SF 40" 59 /" 51 /" 30 /" 23 /" 26 /" 21 /"
21-95 SF 43 ⁄" 63 /" 56 /" 34 /" 26 /" 30 /" 24 /"
21-105 SF 47 ⁄" 56 /" 48 /" 38 /" 18 /" 34 /" 15 /"
21-125 SF 55 ¾" 59" 51 /" 46 /" 23 /" 42 /" 21 /"
TOP
VIEW O P Q R S T U V
21-85 SF 25 /" 7 /" 7" 19 /" 7 ¼" 25 /" 10 /" Ø 8"
21-95 SF 27 /" 8 /" 7" 21 /" 7 ¼" 30" 11 /" Ø 10"
21-105 SF 24" 6 /" 6 /" 23 /" 8" 31 /" 11" Ø 8"
21-125 SF 26 /" 7 /" 7 /" 27 /" 8" 39 /" 11 /" Ø 10"
BACK
VIEW H I
21-85 SF 11 /" 16 /"
21-95 SF 12 /" 18 /"
21-105 SF 13 /" 20 /"
21-125 SF 15 /" 24"
SIDE
VIEW J K L M
21-85 SF 21" 32 /" 59 /" 14"
21-95 SF 20 /" 36 /" 63 /" 14 /"
21-105 SF 20 /" 29 /" 56 /" 13 /"
21-125 SF 20 /" 32 /" 59" 14 /"
BOTTOM
VIEW W X Y
21-85 SF 16 /" 13 /" 12 /"
21-95 SF 15 /" 15 /" 15 /"
21-105 SF 17 /" 11 /" 8"
21-125 SF 21 /" 14 /" 11 /"
X
6 ¾" 6 ¼"
W
Y
Glass

16
3
DIMENSIONSSTÛV 21
.2 DOUBLE FACE
FRONT VIEW SIDE VIEW TOP VIEW BOTTOM VIEW
Anchor
plate
E
B
C
G
F
5 / "
D
A
4 / "
K
L
29 / "
9 ¾"
J
M
ø i
ø
6 ¼"
14
¾"
3 ¾"
17"
6 ¾"
6 ¼" N
13 ¼"
ø 6"
H
TOP
VIEW i J K L M N
21-85 DF 10" 6 ⁄" 19 ⁄" 7 ¼" 25 ⁄" 16 ½"
21-95 DF 12" 6 ⁄" 21 ⁄" 7 ¼" 30" 18 ½"
21-125 DF 12" 7 ⁄" 27 ¾" 8" 39 ⁄" 24 ⁄"
FRONT
VIEW A B C D E F G H
21-85 DF 39 ¾" 59 ⁄" 51 ¾" 30 ¾" 23 /" 26 ½" 21 /" 32 ⁄"
21-95 DF 43 ⁄" 63 ½" 56 ¼" 34 ⁄" 26 /" 30 ⁄" 24 /" 36 ⁄"
21-125 DF 55 ½" 59" 51 ⁄" 46 ½" 23 /" 42 ⁄" 21 /" 32 ⁄"

17
3
DIMENSIONSSTÛV 21
2x ½" cement boards are ALWAYS MANDATORY under the fireplace.
If a podium made of combustible materials is installed, it must be
protected by ½’’ cement boards on top and in front.
For the Stûv 21, there is no R Value to be considered when installing floor finishing
materials. All materials installed under and in front of the fireplace must be non
combustible to a height of 6 ½’’, see below for additional information.
1
2
3
Floor protection is MANDATORY. See adjoining section.
4
5
See section : 3.7 Hearth extension
All components located in the hearth extension zone, for a height of 6 ½’’ from
the bottom of the glass must be in non combustible materials.
.3 R VALUE
2
1
4
3
5
P
8"
8"
21-85 26 ½"
21-95 30 ⁄"
21-105 34 ¼"
21-125 42 ⁄"
In order to be compliant with building codes floor protection is mandatory. The
surface of the floor in front of the unit must be protected by non combustible floor
protection (tile, plate, slab..) .
This protection must cover the width of the glass plus 8’’ on each side of the glass
(see table (P)) according regulations per Country.
A non combustible sealing strip must be placed through the whole length of
the junction between the cement board and the finished floor to avoid ember
projections.
Sealing strip
Floor protection
Glass
Cover to the top of the
2x ½’’ cement boards...
...to underneath the
floor protection.
COUNTRY P
Canada 18"
United States 16"
.4 FLOOR PROTECTION
3

18
3
DIMENSIONSSTÛV 21
NOTE
Installing two ½" cement board
under the unit is mandatory. If
a combustible framing is built, it
must be strong enough to support
the weight of the fireplace and
cement board must be installed
over it.
!
NOTE
Framing is not always perfectly level. We
suggest that at least /'' clearance be
added to the dimensions listed in the table.
!
MODEL A B C**
21-85 SF 40" 25 ⁄" 59 ⁄"
21-95 SF 43 ⁄" 27 ¾" 63 ½"
21-105 SF 47 ⁄" 24 ¼" 56 ⁄"
21-125 SF 55 ¾" 26 ¾" 59 ⁄"
21-85 DF 40" 29 ¾" 59 ⁄"
21-95 DF 43 ⁄" 29 ¾" 63 ½"
21-125 DF 55 ¾" 29 ¾" 59 ⁄"
.5 FRAMEWORK CHARACTERISTICS .6 NON-COMBUSTIBLE MATERIAL
3
The dimensions given above will vary if a front panel or a Stûv frame is used.
For wall finishing without a front panel see the last page of the INSTALLATION
section. For frames and front panels, refer to the specific appendix or contact
customer service for more details.
MODEL D E F G
21-85 36 ¾" 28 ¾" 31" 23 ¾"
21-95 40 ⁄" 30" 34 ⁄" 27"
21-105 44 ⁄" 31 ⁄" 38 ¾" 18 ½"
21-125 52 ½" 28 ¾" 46 ½" 23 ¾"
** This value varies according to the
height of the adjustable stand.
6 ½"
min.*
FG
E
min.
D min.
4"
4"
!
IMPORTANT
Use a ½" cement board to finish the hearth opening after the fireplace installation.
Other non-combustible materials may be used. The framing and the wall finishing
around the hot air grille boxes are required to be in non-combustible materials. It is
mandatory to affix 4" of cement board around the hot air grille.
!
C**
78"
min.*
A
min.
B
min.
17’’
non-combustible
cement board
combustible
* From the bottom of the unit
Without the adjustable stand
2 x cement
board ½''
non-combustible
framing
To be installed
after the fireplace

19
3
DIMENSIONSSTÛV 21
.7 AIR SUPPLY
It is essential to install two
room air intakes and two
hot air outlets in order to
have a natural, functional
and efficient convection.
10' Maximum horizontal distance
from the side of the fireplace in the
centre of the air grilles.
The room air inlet for convection
cannot be higher than the
bottom of the glass.
60" Minimum distance from the floor
to the centre of the hot air outlet.
12" Minimum distance from the ceiling
to the centre of the hot air outlet.
Room air intakes
Hot air outlets
1
4
2
3
Poor airflow in your convection system
should be avoided. Installing the hot
air outlet in an enclosed or restricted
space, such as a cabinet box or shelf, is
prohibited.
It is important that the airflow be
continuous. It is forbidden to take
fresh air from a closed room and
to discharge the same airflow
into another closed room.
The hot air duct must always be
installed horizontally or ascending as
hot air naturally goes up, never down.
It is forbidden to have a curtain or any
other object that can block the airflow
located less than 24" in front of the
hot air outlet, as air could get trapped
behind it creating a heat trap.
To ensure adequate
convection, air inlet and
outlet should be facing
the same direction in the
same room.
12" MIN.
60"
MIN.
10’
MAX.
1
4
2
3
H MAX.
No
MAX.

20
3
DIMENSIONSSTÛV 21
.7 AIR SUPPLY
Combustion air intake
Outside air via the airtight box is
recommended for a better draft.
Convection air inlet
The majority of fireplace
installations use the air intake
from underneath the unit.
Supplying air to the fire
An outside air supply
contributes to the
strength and beauty
of the flames.
Hot air outlet
Heating efficiency
is determined by
the convection air.
The air gets warmer
The air passes near the
combustion chamber
and warms up.
Flue outlet
Constant air eva-
cuation prevents
back drafts
COMBUSTION AIR
1
2
2
1
3
3
Before starting the installation, it is important to choose the air inlets and outlets
that will be used for the convection system.
A minimum of two intakes and outlets must be connected. Air inlets are located in
the lower part of the fireplace. Favor the connection under the fireplace. In the case
of a low installation, the bottom pre-cuttings on the sides can be used. For the hot
air output we recommend using the top back outlets.
For all questions concerning a non-standard installation,
contact Stûv America customer service.
x2
x2
CONVECTION AIR
The fireplace is supplied with two types of
air: convection air and combustion air.