Stuv 21 Series User manual

S T U
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V 21:
SPECIFICATIONS &
MANUFACTURER
INSTALLATION
GUIDE

1. PRELIMINARY INSTALL INFORMATIONS
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In relation to the installation and use of this appliance, the installer and the user should strictly
adhere to local and national regulations as well as Australian & New Zealand Standards AS/NZS
2918:2001. They should also follow the instructions detailed in the Stûv 21 installation and user
manual. Safe operation of the fireplace is directly dependent thereon. The liability of the manufacturer
can neither be retained nor assured following failure of installation or incorrect use which is not
compliant with AS/NZS 2918:2001.
As each installation is different, a qualified and licensed trade’s professional should take all required
preliminary precautions depending on the technical elements inherent to each job.
In-observance of the assembly instructions in conjunction with AS/NZS 2918:2001 entails the liability
of the person who carries it out.
Fireplace structure and finishes shall be to your own design providing the exact and minimum
dimensions are maintained.
The floor must have adequate strength to support the fireplace. N.B. Timber floors may require
additional reinforcing.
Construction of the fireplace structure from floor to ceiling shall be: solid brick (110mm minimum),
Silicate board (40mm), stone (100mm minimum) or AAC block (75mm minimum).
When installed on a combustible floor surface the Stûv 21 firebox must be positioned on top of an
18mm cement sheet floor plate and raised to a minimum height of 150mm using the appliance
adjustable feet.
As a result of faulty assembly, use of parts or additional components not supplied by the
manufacturer/distributor, and/or modifying of the appliance or components will result in inferior or
unsafe operation. Should this occur the manufacturer/distributor bears no liability, and will result in a
null and void product warranty.

2. SPECIFICATIONS
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SINGLE FRONTED MODEL - STUV 21
DIMENSIONS (mm)
OTHER DETAILS
STUV 21 / 95 SF STUV 21 / 105 SF STUV 21 / 125 SF STUV 21 / 135 SF
OUTPUT KW 10kw to 18kw 7kw to 19kw 11kw to 23kw 11kw to 21kw
HEATING CAPACITY 120m2125m2145m2130m2
MINIMUM FLUE HEIGHT 4.5m 4.5m 4.5m 4.5m
WEIGHT (excluding zero clearance casing) 292kg 224kg 305kg 286kg
MAX LOG SIZE 60cm 80cm 100cm 100cm
ACTIVE FLUE SIZE
STUV 21 / 95 SF STUV 21 / 105 SF STUV 21 / 125 SF STUV 21 / 135 SF
A950 1050 1250 1350
B1455 1040 1295 1040
C590 496 563 500
D770 870 1070 1170
E615 400 535 400
ACTIVE FLUE SIZE
300mm,350mm
ADDITONAL FLUE LINERS
250mm
250mm
300mm,350mm 250mm,300mm
200mm 300mm
350mm,400mm

2. SPECIFICATIONS
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Extended exhaust plate
STÛV 21 / 95 DF
STÛV 21 / 125 DF
A
950
1250
B
1455
1295
C
670
670
D
770
1070
E
615
535
OTHER DETAILS
STÛV 21 / 95 DF
STÛV 21 / 125 DF
OUTPUT KW
12kw to 27kw
14kw to 27kw
HEATING CAPACITY
165m2
165m2
MINIMUM FLUE HEIGHT
4.5m
4.5m
WEIGHT (excluding zero clearance casing)
297kg
310kg
MAX LOG SIZE
700mm
1000mm
ACTIVE FLUE SIZE
250mm
300mm
ADDITIONAL FLUE LINERS
300mm, 350mm
350mm, 400mm
DOUBLE FRONTED MODEL - STUV 21
DIMENSIONS (mm)

3. CLEARANCES - IMPORTANT
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When installed on a combustible floor surface the Stûv 21 firebox must be positioned on top of an 18mm cement
sheet floor plate and raised to a minimum height of 150mm using the appliance adjustable feet.
When installed on a non-combustible floor the fireplace can be installed directly onto the floor and adjusted in
height using the adjustable feet.
In a cavity built out of bricks, block work or 75mm ACC block the appliance must be installed with a minimum
gap of 50mm at the back and on the sides.
In a cavity built out of silicate boards the appliance must be installed with a minimum gap of 100mm at the back
and on the sides.
Only non-combustible material (silicate board, Promatect H 12mm or brickwork) shall be used on the front wall
of the cavity.
All internal framework above the appliance shall be made of non-combustible material.
The cavity above the appliance must be capped and must have a minimum of 2500cm2 of venting.
The appliance must be fitted with the standard triple skin flue.
To conform to the requirement of the joint AS/NZS 2918:2001 the appliance must be bolted down to comply
with the seismic restrain provisions.

4. INSTALLATION - FLOOR PREPARATION
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The Stûv 21 can be installed straight
onto the surface with no prior
preparation required.
NON-COMBUSTIBLE FLOOR
The Stûv 21 must be installed on
a 18mm tick cement sheet plate
(minimum) and raised using the
appliance’s adjustable feet so that the
bottom edge of the firebox door is at
least 300mm from the floor.
BRICK WORK
50mm AIR GAP
18mm CEMENT SHEET
TIMBER FLOOR
COMBUSTIBLE FLOOR
NON-COMBUSTIBLE SURFACE
300mm minimum
COMBUSTIBLE SURFACE

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NON-COMBUSTIBLE FLOOR
CAVITY LID 30MM SILICATE BOARD 70mm SILICATE BOARD
COMBUSTIBLE WALL
NON COMBUSTIBLE BOARD
100mm AIR GAP
50mm AIR GAP
NON-COMBUSTIBLE FLOOR
FRONT
BACK

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When installed on a combustible floor surface the Stûv 21 firebox must be positioned on top of a 18mm cement
sheet floor plate and raised to a minimum height of 150mm using the appliance adjustable feet.
STÛV 21 /105 SF
STÛV 21 / 135 SF
STÛV 21 / 95 SF/DF
STÛV 21 / 125 SF/ DF
A
1300
1600
1200
1500
B
1140
1140
1555
1395
C
150
150
150
150
D
800
800
800
800

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NON-COMBUSTIBLE FLOOR
CAVITY LID 30MM SILICATE BOARD
NON COMBUSTIBLE BOARD
BRICKWORK
50mm AIR GAP
NON-COMBUSTIBLE FLOOR
FRONT
BACK

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For installations where a combustible floor is
situated in front of the Stûv 21 a non combustibe
hearth (floor protector) is required.
For installations where
t he
Stûv 21 is raised and an
outside air kit is being
fitted below the appliance
there is an
OPTIONAL STEEL
STAND available.

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The minimum flue run for all Stûv fireplaces must be 4.5m from
the appliance to the top of the external flue.
Coming off of the appliance the flue must run straight vertically for a
minimum of 900mm before a bend or elbow can be included in the flue
run. Elbows or bends in the flue must be a maximum angle of 45º
STÛV 21 /105 SF
STÛV 21 / 135 SF
STÛV 21 / 95 DF
STÛV 21 / 125 DF
A
200mm
250mm
250mm
300mm
B
250mm
300mm
300mm
350mm
C
300mm
350mm
350mm
400mm
4500mm
MIN
FLUE SYSTEM (Triple flue system)

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4. INSTALLATION - SHELVES
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A
COMBUSTIBLE SHELF

5. C0NVECTION
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Convection air inlets are through single wall flexible ducts.
Convection air outlets must be through insulated double wall ducts.
It is important that the air flow is continuous. It is therefore forbidden to remove the air from a room and
send it to another airtight room.
Use a minimum of 2 fresh air inlets and 2 hot air outlets.
The distance between the ceiling and the center of the hot convection grill must be at least 35cm.
The horizontal distance between the hot air convection grill and the appliance cannot be greater than 3m.
The vertival distance between the hot air convection grill and the appliance is not limited.
See fig I and J.
Figure I
35cm (minimum)
155cm (minimum - from the base of the appliance)
CONVECTIONAIRINLET
CONVECTION AIR OUTLET
35cm (maximum)

5. C0NVECTION
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The convection air never comes into contact with the fire. The convection is an independant air channel.
The air circulates around the combustion chamber, gets hot and goes out through convection grates in
the same room or in other rooms.
CONVECTION AIR CIRCULATION CONVECTION AIR INLET CONVECTION AIR INLET
HOT AIR OUTLETS
CONVECTION AIR CIRCULATION

6. C0MBUSTION
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When operating with an open fire, the Stûv 21 consumes a large amount of air. Therefore, we recommend
providing an external air supply, although this is not mandatory.
A sufficient air inlet must be created under the stove, at the front. When not using the air intake box with
connected duct, the base of the fire must be supplied with fresh air. The fresh air must come from a ventilated
empty space, a ventilated room or from outside the house (mandatory for passive/air tight buildings).
ONLY DUCT THE FRESH AIR INLET TO THE APLLIANCE USING THE INTAKE BOX.
The air intake, which varies depending on the model, should ideally be located beneath the front of the unit
and incorporate a shut-off register (fig a).
Ideally the fresh air inlet would be fitted with a closure valve (fig e and f) to prevent the room from becoming
cold when the appliance is not in use. It should ideally be located as close as possible to the outside wall and
controlled from inside the room.
a. COMBUSTION AIR CIRCULATION b. COMBUSTION AIR INLET c. COMBUSTION AIR INLET WITH DUCTED INTAKE BOX
d. COMBUSTION AIR INTAKE BOX (Double-sided fires x 2) e. EXTERNAL COMBUSTION AIR INTAKE f. EXTERNAL COMBUSTION AIR INTAKE

6. C0MBUSTION
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INLET
DIAMETER
STÛV 21 / 105 SF
150mm
STÛV 21 / 135 SF
150mm
STÛV 21 / 95 DF
150mm
STÛV 21 / 125 DF
150mm
EXTERNAL COMBUSTION AIR (INTAKE BOX) EXTERNAL COMBUSTION AIR (NO INTAKE BOX) INTERNAL COMBUSTION AIR (INTAKE BOX)
EXTERNAL COMBUSTION AIR DOUBLE SIDED (INTAKE BOX)
COMBUSTION AIR INLET

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TEST REPORT NO ASFT18044 (PRELIMINARY REPORT)
TESTING LABORATORY: Australian Solid Fuel Testing
MANUFACTURER: Stûv
MODEL: Stûv 21
WORK REQUESTED: Compliance with AS/NZS2918:2001 Standards
ISSUE DATE: 4/05/2018
CONCLUSION:
The Stûv 21 Inbuilt appliance installed with a triple skin flue system, conforms to the requirements
of Australian/New Zealand Standard 2918:2001, with respect to floor, side wall and rear wall
surface temperatures, when tested in accordance with Appendix B of AS/NZS2918;2001.

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What you should burn
• Untreated, air dried softwood
• Split logs with a humidity content of less than 20%
Do not burn
• Trash
• Painted plastic
• Coated or preservative treated wood
• Waste or black coal
• Inflammable liquids
• Fire gels
• Moist wood with a residual humidity content of more than 20% (this may cause soothing of the chimney).