BuckMaster 21 NON-CATALYTIC UNIT User guide

MODEL 21
NON-CATALYTIC UNIT
With Motor
FEATURES
PREPARATIONS INSTALLATION
OPERATION MAINTENANCE SAFETY
FIREPLACE INSERT & FREESTANDING
Revised November 2021
SAFETY NOTICE
IF THIS HEATER IS NOT PROPERLY INSTALLED, A HOUSE FIRE MAY
RESULT.FOR YOUR SAFETY, FOLLOW THE INSTALLATION INSTRUCTIONS.
CONTACT THE AUTHORITY HAVING JURISDICTION (SUCH AS MUNICIPAL
BUILDING DEPARTMENT, FIRE DEPARTMENT, FIRE PREVENTION
BUREAU, etc.) CONSULT BEFORE INSTALLATION TO DETERMINE THE NEED
TO OBTAIN A PERMIT. KEEP THESE INSTRUCTIONS FOR FUTURE USE.
LISTED BY: PFS/TECO, COTTAGE GROVE, WI
MANUFACTURED BY NEW BUCK CORPORATION
200 ETHAN ALLEN DRIVE
P.O. BOX 69
SPRUCE PINE, N.C. 28777
www.buckstove.com
MODEL21
NON-CAT
MODEL51
NON-CAT
MODEL26
NON-CAT
B u c k
S t o v e
B u c k
S t o v e B u c k
S t o v e
MODEL21
NON-CAT
MODEL51
NON-CAT
MODEL26
NON-CAT
B u c k
S t o v e
B u c k
S t o v e B u c k
S t o v e
Buck Stove

TABLE OF CONTENTS
Important Instructions...........................................................................................................................................................2
Stove Parts Identification......................................................................................................................................................3
SECTION I: Introduction .....................................................................................................................................................4
Chimney Heights ..................................................................................................................................................................5
SECTION II: Masonry Insert Installation.............................................................................................................................6
Floor Protection ....................................................................................................................................................................7
Mounting Trim Panels .......................................................................................................................................................8-9
Masonry Insert Installation options ...............................................................................................................................10-11
SECTION III: Pre-Fab Insert Installation...........................................................................................................................13
SECTION IV: Residential Freestanding Installation .........................................................................................................14
Out Side Air Installation ..................................................................................................................................................... 15
Floor Protection ..................................................................................................................................................................16
Residential Installation
A. Vertical Exit Using Single Wall Pipe /Listed 2100° UL 103 HT chimney w/out
Close Clearance/Pipe Shield........................................................................................................................................17
B. Vertical Wall Exit Using Single Wall Pipe and Elbow /Listed 2100° UL 103 HT Chimney
and T-BOX assembily w/out Close Clearance/Pipe Shields .......................................................................................19
Residential and Mobile Home Freestanding Installation (See Page 12) For Out Side Air Installation.
C. Vertical Exit Using DVL Close Clearance Pipe /Listed 2100° UL 103 HT chimney w/out
Close Clearance/Pipe Shields ......................................................................................................................................21
D. Vertical Wall Exit Using DVL Close Clearance Pipe ,and Elbow /Listed 2100° UL 103 HT
Chimney and T-BOX assembly w/out Close Clearance/Pipe Shields .........................................................................23
E. Vertical Exit Using DVL Close Clearance Pipe /Listed 2100° UL 103 HT chimney with
Close Clearance/Pipe Shields ......................................................................................................................................25
F. Vertical Wall Exit Using DVL Close Clearance Pipe ,and Elbow /Listed 2100° UL 103 HT
Chimney and T-BOX assembly with Close Clearance/Pipe Shields ...........................................................................27
SECTION V: Alcove Installation .......................................................................................................................................31
Floor Protection ..................................................................................................................................................................32
Alcove Installation Clearances ...........................................................................................................................................33
Installation of Close Clearance Shields .............................................................................................................................. 35
Wood Heater Safety............................................................................................................................................................37
SECTION VI: Operation and Efficiency ............................................................................................................................ 38
Guide To Burning Qualities of Wood.................................................................................................................................39
Replacement Motor, Thermostat, Rheostat Installation ................................................................................................40-42
SECTION VII Maintenance: Brick Layout ........................................................................................................................43
Secondary Air Tube Replacement / Baffle Board Replacement ........................................................................................44
Door Gasket Replacement .................................................................................................................................................45
Check Chimney / Cleaning Heater / Care of Glass Door ................................................................................................... 46
Troubleshooting.............................................................................................................................................................48-49
Replacement parts..........................................................................................................................................................49-50
LIMITED WARRANTY

Page 2
INSTALLATION AND OPERATION
IMPORTANT INSTRUCTIONS
WARNING
THESE UNITS GENERATE A LOT OF HEAT, SO TREAT THEM WITH CARE. HOT
WHILE IN OPERATION. KEEP CHILDREN, CLOTHING AND FURNITURE AWAY.
CONTACT MAY CAUSE SKIN BURNS. READ ALL INSTRUCTIONS BEFORE
INSTALLING AND USING THE APPLIANCE. FAILURE TO FOLLOW
INSTRUCTIONS MAY RESULT IN PROPERTY DAMAGE, BODILY INJURY OR
EVEN DEATH. SAVE THESE INSTRUCTIONS FOR FUTURE REFERENCES.
 The New Buck Corp. non-catalytic systems have been tested to UL 1482 Standards and
certified by PFS/TECO.
 When burning any unit or appliance that combusts fuel for heat, such as coal, oil,
wood or natural and (L.P.) liquid petroleum gas, we highly recommend use of
smoke and carbon monoxide detectors in your home. Correctly place monitors in
those areas that are expected to produce CO. Consult with your local fire safety
officials to learn more.
 This wood heater needs periodic inspection and repair for proper operation. It is
against federal regulations to operate this wood heater in a manner inconsistent with
operating instructions in this manual.
 Early signs of carbon monoxide poisoning resemble flu, with headaches, dizziness and/or
nausea. If you have these signs, heater may not be working properly. Get fresh air at once!
 Install and operate your units according to instructions provided in this manual. Local
building codes may apply; therefore, contact your local building inspector or fire marshal
for necessary installation requirements and permits which may go beyond these
instructions. The authority having jurisdiction should be consulted before installation to
determine the need to obtain a permit. Contact your insurance company for coverage and
installation inspection.
 If appliance is installed in permanently manufactured homes:
DO NOT INSTALL IN SLEEPING ROOMS.
 The Model 21 is approved for use in specified Pre-Fabricated fireplaces (ZCF’s). Use the
list on Page 13 or contact your dealer for additional units.
 Examine the masonry fireplace and chimney prior to installation of the fireplace accessory
to determine that the construction meets the minimum fireplace construction requirements
illustrated in the instructions, that it is free from cracks, loose mortar, creosote deposits
and other blockage or other signs of deterioration.
CAUTION
DO NOT USE MORE THAN ONE STOVE TO A CHIMNEY. DO NOT USE A FLUE
INTENDED FOR A GAS APPLIANCE. DO NOT CONNECT THIS UNIT TO A
CHIMNEY FLUE SERVING ANOTHER APPLIANCE. DO NOT CONNECT TO ANY
AIR DISTRIBUTION DUCT OR SYSTEM.

Page 3
1. 6" Flue Exit
2. Warm Air Outlets
3. Air Wash and Screen
4. Secondary Air Tubes
5. Top Baffle Board
6. Firebrick
7. Hearth Extension and Hearth Trim
8. Cover Door
9. Primary Air Control
10. Hinge Block
11. Hinge Pins
12. Cast Door
13. Door Glass
14. Glass Clips Small; Side, Top, Bottom
EPA COMPLIANCE STATUS
This manual describes installation and operation of the New Buck Corporation Model 21 wood heater.
This heater meets the U.S. Environmental Protection Agency’s Emission limits for wood heaters and is
in compliance with 2020 particulate emission standard. Under specific test conditions, this heater has
been shown to deliver heat at rates ranging from approximately 11,079-28,901 BTU/hr four the Model
21. Efficiency was calculated using CSA B415-1.10 stack loss method. A weighted average was used to calculate
the overall efficiency across all of the4 burn rate categories using the higher heating value (HHV).
MODEL 21 WOOD STOVE IDENTIFICATION
Buck Stove
DUMP CHANNEL.
SWEEP ASHES INTO ASH
ASH DUMP TOP LID AND
REAR OF HEATER. OPEN
DUMP TOP LID IN RIGHT
FIRE BOX. LOCATE ASH
OPEN MAIN DOOR TO
(4)
TURN BLOWER ON.
REPLACE ASH PAN IN PEDESTAL.
BE PLACED ON A NON COMBUSTIBLE FLOOR
UP TO 72 HOURS AFTER REMOVAL.
THOROUGHLY COOLED. ASHES CAN IGNITE
CONTAINER UNTIL ASH CINDERS HAVE
SHOULD BE RETAINED IN THE CLOSED
OTHERWISE LOCALLY DISPERSED, THEY
DISPOSED OF BY BURIAL IN SOIL OR
FINAL DISPOSAL. IF THE ASHES ARE
ALL COMBUSTIBLE MATERIALS, PENDING
OR ON THE GROUND, WELL AWAY FROM
CLOSED CONTAINER OF ASHES SHOULD
WITH A TIGHT FITTING LID. THE
BE PLACED IN A METAL CONTAINER
DISPOSAL OF ASHES: ASHES SHOULD
(6)
(5)
OF ASHES PROPERLY.
FROM PEDESTAL AND DISPOSE
OF REAR NOTCH. REMOVE PAN
LID AND LIFT ASH PAN OUT
WHEN FINISHED, CLOSE TOP
NOTE:
1 4 3
11
2
13
12
18
17
7
9
8
6
10
14
16
15
5
19
15. Door Gasket
16. Door Glass Gasket
17. Door Handle
18. Spring Handle
19. -Door Latch
-Door Latch Screw
-Door Handle Bushing
-Door Handle Spacer
-Door Latch Flat Washer
-Door Latch Screws (Phillips Head)
-Door Latch Screws (Allan Head)

Page 4
INTRODUCTION
Your new MODEL 21 is a non-catalytic unit designed to meet the most stringent emissions
standards without the use of a catalytic combustor. This effect is achieved through the use of
secondary air which is mixed with primary air in the unit’s firebox.
For peak performance, we suggest the use of hard seasoned natural wood, loading wood length
way from front to rear.
NOTE: Soft woods such as pine, create more creosote, clogging of chimney and produce a less
efficient burn performance.
You should not burn trash or garbage, artificial or paper logs, gift wrapping, treated or painted
wood or any type of coal.
DO NOT USE CHEMICALS OR FLUIDS TO START THE FIRE.
DO NOT BURN GARBAGE OR FLAMMABLE FLUIDS.”
The primary air, which is controlled by the user, burns the wood. Secondary air is admitted into
firebox through secondary air tubes at top of the firebox. This secondary air burns impurities in
the smoke released from initial wood burning. The temperature necessary for this combustion is
maintained through the firebrick refractory. If any more technical information is necessary,
contact your local dealer.
A factory-built prefabricated chimney may be used for your unit when installed in compliance
with the manufacturer's specification and uniform building code.
SECTION I
CAUTION
YOUR CHIMNEY OR FLUE MUST BE CORRECTLY SIZED. A CHIMNEY OR FLUE
THAT IS TOO SMALL OR LARGE IN DIAMETER, OR TOO SHORT, CAN CAUSE
YOUR STOVE TO SPILL SMOKE WHEN DOOR IS OPENED.

Page 5
Stack wood in criss-cross
pattern under a shelter to allow
air flow to dry wood and to keep
wood from rain. Green wood
may have 50-60% moisture
content. Wood seasoned outside
uncovered may have 40%
moisture content. Wood
properly seasoned in a covered
environment will have less than
20% moisture content.
3 FT.
2 FT.
LESS THAN
10 FT.
2 FT.
10 FT.
GREATER
THAN
10 FT.
3 FT.
METAL
CHIMNEY
MASONRY
CHIMNEY
2 FT. MINIMUM HEIGHT ABOVE THE
ROOF WITHIN 10 FT. HORIZONTALLY
CHIMNEY “10 FT.” RULE (MINIMUM HEIGHTS)
NOTE: MINIMUM CHIMNEY HEIGHT 15 FT.
CHIMNEY HEIGHTS
HOW TO STACK WOOD
Figure 3
Figure 2

Page 6
MASONRY INSERT INSTALLATION
The Model 21 may be installed using an all masonry fireplace built in accordance with the
Uniform Building Code and National Fire Protection Association (NFPA). The first step in
this type of installation is to determine the acceptability of fireplace and chimney for use with a
woodstove. Both construction and condition of fireplace are important
considerations when installing a woodstove. The chimney should extend at least 3' above roof
and at least 2' above any point of the roof within 10'. (See Page 5, Figure 3).
MINIMUM CLEARANCES TO FLOOR AND COMBUSTIBLES
MINIMUM CLEARANCE MASONRY INSERT
A. Side Wall Combustible
B. Front Floor Protector
C. Side Floor Protector
D. Side Wood Trim
E. Top Wood Trim
F. Mantel or Brackets
25"
16"
8"
17"
17"
25"
MODEL 21
1. The hearth must be of masonry construction and must extend a minimum of 16" in front of
firebox opening and a minimum of 8" to either side of the firebox opening.
(See Figure 4).
2. If there is not minimum hearth protection from the front of firebox opening and front of
masonry hearth, a floor protector must be used in front of hearth to protect combustible
materials. The floor protector must be 3/8" minimum thickness non- combustible material
or equivalent.(See Page 7).
F
B
A
E
C
D
F
B
A
E
C
D
F
B
A
E
C
D
Figure 4
CAUTION
REMEMBER TO HAVE YOUR CHIMNEY INSPECTED FOR LEAKS AND BLOCKAGE
BEFORE YOU INSTALL YOUR STOVE. DO NOT CONNECT THIS UNIT TO A
CHIMNEY FLUE SERVING ANOTHER APPLIANCE.
SECTION II

Page 7
Floor Protection:
When installing freestanding heater, a floor protector must be use. Floor protector must be 3/8”
minimum thickness non-combustible material or equivalent.
How to use alternate materials and how to calculate equivalent thickness
An easy means of determining if a proposed alternate floor protector meets requirements listed
in the appliance manual is to follow this procedure:
1. Convert specification to R-value:
R-value is given—no conversion is needed.
K-factor is given with a required thickness (T) in inches:
C-factor is given: R=1/C
2. Determine the R-value of the proposed alternate floor protector.
Use the formula in step (1) to convert values not expressed as “R”
For multiple layers, add R-values of each layer to determine the overall R-value.
3. If the overall R-value of the system is grater than the R-value of the specified floor protec-
tor, the alternate is acceptable.
Example:
The specified floor protector should be 3/4” thick material with a K-factor of 0.84.
The proposed alternate is 4” brick with a C-factor of 1.25 over 1/8” mineral board with a
K-factor of 0.29.
Step (a): Use formula above to convert specification to R-value. R= 1/K x T = 1/0.84 x .75 =
0.893
Step (b): Calculate R of proposed system. 4” brick of C=1.25, therefore Rbrick = 1/C = 1/1.25
=0.80 1/8” mineral board of K = 0.29, therefore Rmin.bd. =1/029 x0.125 = 0.431
Step (c): Compare proposed system R of 1.231 to specified R of 0.893. Since proposed
system R is greater than required , the system is acceptable.
Definitions:
Thermal conductance = C = Btu = W
(hr)(ft²)(°F) (m²)(°K)
Thermal conductance = K = (Btu)(inch) = W= (Btu)
(hr)(ft²)(°F) (m)(°K) (hr)(ft)(°F)
Thermal conductance = R = (ft²)(hr)(°F) = (m²)(°K)
Btu W

Page 8
INSTALLATION PROCEDURE (Use a Listed Direct or Positive Connect)(See Page 6).
FIGURE 5 POSITIONING
3. Slide unit out of the fireplace far enough to work behind trim panel reference lines.
4. Mount side trim panels. (See Figure 6).
a. Position trim panel on reference line.
b. Drill mounting holes in center of trim panels mounting brackets to allow for adjustment in and out if
necessary.
c. Mount trim panel using self-tapping screws provided.
5. Place top panel back on reference mark. Take top trim panel mounting bracket supplied with unit. Position
bracket so it overlaps rear lip of top trim panel. Drill mounting holes in top of stove using holes in bracket as
guide. Tighten down screws.
6. Now, follow installation procedures in the listed direct connect or positive connect kit you are using and install
heater connect kit in the fireplace.
7. Slide unit back into fireplace. Check to be sure that trim panels are properly positioned and lie flat against
front of fireplace. If one or more of the panels is out of position, slide unit out and reset by loosening
mounting screws and repositioning in slot.
8. Reinstall top trim panel by sliding rear lip of top trim panel underneath front lip of mounting bracket already
secured to top of unit.
NOTE: Mount top trim panel so that it sits in front of top of side trim panels.
9. Obtain brass trim kit provided with unit and slip over top and sides of trim panels. (Top ends of brass may
need to be trimmed to fit).
POSITIONING THE HEATER
NOTE: If the three suggested installations have been
chosen, certain steps must be followed when installing
heater into a masonry fireplace.
When positioning heater, the following conditions
MUST be met! (See Figure 5).
1. The front of damper opening must be positioned
BEHIND back edge of the lintel to ensure proper
draft. (See Figure 5).
2. Center heater in fireplace opening.
MOUNTING THE TRIM PANELS
After unit is positioned as shown in (Figure 8), mark
mounting position of trim panels as follows:
1. Place side trim panels in place, flat against the face
of the fireplace. Mark down front edge of trim panel
with a pencil to make a vertical reference line. (See
Figure 6).
2. Place top (long) trim panel in place on top of unit.
The panel should be flat against the outside face
of fireplace and standing vertically. Mark along
lower edge of trim panel with a pencil to make a
reference line for mounting.
FIGURE 6 MOUNTING TRIM PANELS

Page 9
POSSIBLE TOOLS NEEDED FOR INSTALLATION
If you decide to install your own stove, there are several hand tools you may need to do the job. If you do not
already have them, they are readily available at most hardware stores.
Caulking gun
Large adjustable wrench (may not be needed)
Drop cloths or newspapers
Vacuum cleaner or whisk broom
Flashlight
1 tube of RTV silicone (Code 103 or 106, or high temperature rubber cement rated between 450oF- 600o F)
7/32" drill bit and drill
Socket/Ratchet Set
INSTALLATION PREPARATION
1. Relocate furniture and other materials away from front of fireplace to allow free access to fireplace.
2. Cover hearth and adjacent floor areas with a drop cloths to protect from soiling or marring surface.
3. Remove existing fireplace damper plate.
4. Thoroughly clean fireplace of ashes and soot.
5. Check chimney and smoke chamber for excessive buildup of creosote or soot. Also, check for obstructions,
such as birds nests. If chimney is excessively dirty, clean it or have someone clean it professionally BEFORE
installing or using room heater.
6. If fireplace has an ash dump or outside air provision, these must be sealed off with metal or tightly packed non
-combustible insulation to prevent cold air from entering fireplace chamber.
10. If direct connect or positive connect kit is not used, follow instructions in mounting trim panels, steps 1-4c on page 10.
11. Mount top trim panel by drilling mounting holes in center of trim panel mounting brackets, with top end side of top panel
overlapping side panel.
12. Using insulation provided, peel and stick to back of panels overlapping fireplace dimensions by 1” on each side and top. (See Page 8,
Figure 6).
13. Next using high heat silicone or furnace cement run heavy bead of caulking around where panels meet stove. (See Figure 7).
14. Slide the unit back into fireplace. Check to be sure that trim panels (and brass) are properly positioned and lie flat against front of
fireplace. If panels are out of position, slide unit out and reset by loosening mounting screws and repositioning in the slot. Using the
bar, lift stove in front. Place insulation across front and the surface of hearth or bottom of fireplace, to make complete seal.
15. To check seal of panels, use candle flame and go around entire area sealed by silicone and insulation. If flame leans toward inside
of fireplace, add additional insulation. This ensures an airtight seal.
SILICONE
SCREW
FIGURE 7

Page 10
MASONRY INSERT INSTALLATION OPTIONS
This unit (appliance) may be installed into an all masonry fireplace, built in accordance with the
Uniform Building Code and the National Fire Protection Association (NFPA 211).
NOTE: Check with local building officials for any permits required for installation of this unit
and notify your insurance company before proceeding with installation
In some cases, such as improperly drawing fireplaces, oversize flue liners are to meet codes in
certain areas it is recommended that one of the flowing procedures be followed:
A. A Chimney Connector can be installed from the appliance flue exit through the damper
and an air-tight face seal. (See option (A) Page 9).
B. A listed Direct Connect can be installed from the appliance flue exit through the damper
into the first section of the flue liner with air-tight seal. (See option (B) Page 9).
C. A Positive Connect can be installed from the appliance flue exit continuing up through the
entire chimney and exiting at the top of the chimney. (See option (C) Page 9).
NOTE: If mounting trim panels, See Page 8-9.
FINAL CHECK
1. Recheck specified clearances.
2. Remove all foreign material from firebox area.
3. Open the primary air draft.
4. Plug power cord into a 115V AC outlet if optional motor is being used. Do not run cord
under unit or in high traffic areas.
5. Place crumpled pieces of newspaper in the stove. Light it and close door. Ensure that the
stove draws properly through primary draft.
6. Check for smoke leaks around door.
7. Open door and check for smoke escaping from front of stove. Smoking usually indicates
a defective or poorly positioned chimney. Some chimneys with a marginal draft can be
preheated by lighting newspaper and holding it near open damper with a poker or fire tong.
Once the chimney heats up, a proper draft can usually be obtained.
If a thorough review of the Troubleshooting Guide in the manual does not reveal the problem,
contact your dealer for assistance.

Page 11
OPTION (B)
REMOVE
DAMPER
OR WIRE IT
OPEN
AIRTIGHT
INSULATED
CLEAN-
BLOCK-OFF PLATE
OR DAMPER
ADAPTER
SEAL TRIM PANELS
WITH INSULATION
OR HIGH
TEMPERATURE
CAULK
STAINLESS
STEEL
CHIMNEY
CONNEC-
TOR MUST
EXTEND 1’
PAST THE
BLOCK-OFF
PLATE OR
TO THE
FLUE LINER
NOTE: Follow installation instruction
with Direct Connection Kit.
(Kit sold separately)
STARTER PIPE
SEAL TRIM PANELS AND UNDER
FRONT OF STOVE UNIT WITH
INSULATION OR HIGH
TEMPERATURE CAULK
OPTION (A)
REMOVE
DAMPER
OR WIRE
IT OPEN
AIRTIGHT INSU-
LATED CLEAN-
OUT
NOTE: New Buck Corporation grants no
warranty, implied or stated, for the installation
or maintenance of your appliance, and assumes
no responsibility of any consequential damage
OPTION (C)
NOTE: Follow installation
instruction with Positive
Connection Kit.
(Kit sold separately)
TRIM PANELS
CAP PREVENTS
WATER FROM
ENTERING)
FLUE
LINER
THE LINER MUST
BE STAINLESS
STEEL CONNEC-
TOR OR FLEXIBLE
VENT. FOLLOW
THE LINER MANU-
FACTURER’S IN-
STRUCTIONS FOR
INSTALLATION
AND SUPPORT.
AIRTIGHT
INSULATED
CLEAN-OUT
REMOVE
DAMPER
OR WIRE
IT OPEN
INSTALL A NON-COMBUSTIBLE
COVER PLATE TO PREVENT
WATER FROM ENTERING THE
CHIMNEY
SAFETY NOTICE:
If this appliance is not properly installed, a house fire may result. For your safety, follow the installation directions.
Contact local building or fire officials about restrictions and installation inspection requirements in your area.

Page 12
The connector and/or chimney should be inspected at least once a month during the heating
season to determine if a creosote buildup has occurred.
CAUTION
THE UNIT IS PAINTED WITH A SPECIALLY FORMULATED HIGH
TEMPERATURE PAINT THAT CURES DURING THE FIRST TWO OR THREE
FIRINGS. YOU MAY NOTICE A SLIGHT SMOKING EFFECT AND AN ODOR OF
BURNING PAINT WHEN YOU BUILD THE FIRST FIRES. THIS IS NORMAL AND
IS NOT A CAUSE FOR ALARM. IN SOME CASES, THESE FUMES WILL
ACTIVATE A SMOKE ALARM. OPENING A WINDOW NEAR THE UNIT WILL
ALLOW THESE FUMES TO ESCAPE. DO NOT BUILD A LARGE, ROARING FIRE
UNTIL THIS CURING IS COMPLETE OR THE HEATER FINISH MAY BE
DAMAGED.
CAUTION
NEVER USE GASOLINE, GASOLINE-TYPE LANTERN FUEL, KEROSENE,
CHARCOAL LIGHTER FLUID OR SIMILAR LIQUIDS TO START OR "FRESHEN
UP" A FIRE IN THE HEATER. KEEP ALL SUCH LIQUIDS WELL AWAY FROM
THE STOVE WHEN IT IS IN USE. ALL FLUIDS OF THIS TYPE GIVE OFF
VOLATILE FUMES AND CAN AND WILL EXPLODE! DON'T TAKE A CHANCE
WITH THE SAFETY OF YOUR HOME AND FAMILY.

Page 13
PRE-FAB INSERT INSTALLATION
The Model 21 has been tested with the following:
Heatilator Security
Tempco Preway
Marco FMI
Woodside Majestic
NOTE: The Model 21 may be installed in any of the pre-fabricated fireplaces listed above if
they are big enough to accept heater.
NOTE: A FULL CHIMNEY LINER IS REQUIRED IN A ZERO CLEARANCE OR PRE -
FABRICATED FIREPLACE.
NOTE: The ash lip, smoke baffle and smoke shelf may be removed if necessary to provide
room for these models. Any other alteration to unit will void ALL NEW BUCK
CORPORATION, responsibility and liability. The warning label below must be
attached to the pre- fabricated fireplace before unit is installed.
Except for the “notes” above, please follow the instructions for Masonry Insert Installation
including Minimum Clearances for stove and floor protector in Section II.
NOTE: When installing trim panels DO NOT COVER ANY EXITING LOUVERS OR AIR
OPENING IN PRE-FABRICATED FIREPLACE .
SECTION III
WARNING: This fireplace must be
restored to its original condition for safe use,
if the fireplace insert is removed.

Page 14
TOOLS FOR INSTALLATION
Drop cloth, 3/32" Metal drill bit, 5/16" magnetic socket chuck adapter, 5/16" wrench (box or socket) or adjustable
wrench, Jigsaw with masonry, metal and wood blades
WARNING: DO NOT INSTALL IN A SLEEPING ROOM
PREPARING THE STOVE FOR INSTALLATION
1. Remove the protective plastic wrapping from unit, inspect unit for any obvious physical damage.
2. Plug power cord into a 115V AC outlet to test motor and fan when optional motor is being used. Do not run cord
under unit or in high traffic areas.
3. Check primary air draft control to ensure that it slides freely.(See Figure 11).
4. Remove any items from within firebox. Spread a dropcloth on floor behind heater. Next, tilt heater so that back is
on drop cloth.
5. (Leg Kit):If legs are to be used, obtain four legs, attach legs to holes in bottom of unit with bolts and washers
supplied with the leg kit. (See Figure 11).
6. (Pedestal Kit): If pedestal kit is being used an outside air is required, see Out Side Air Installation below. Open
freestanding kit and obtain stand. Place stand against bottom of heater (angle side to heater). Center stand front to
back and also center stand left and right. Mark screw locations on bottom of stove through outer holes of stand
mounting angles. Set stand aside and drill four 7/32" holes in heater bottom. Before attaching heater to stand,
take a large flat screwdriver or pliers and remove the 2" x 2" knockout on bottom of unit.
(See Figure 12). Then mount stand to bottom of heater with screws provided. (See Figure 12).
7. Obtain four (4) 3/16" self-tapping screws and secure stand to heater.
8. Reposition heater to the upright position.
Out Side Air Installation
1. Select an installation location that gives the best airflow from the front of heater to remainder of home.
2. Place protective floor pad in position. For minim floor protection (See Page 16).
Figure 12
2" x 2"
KNOCKOUT
Figure 11
PRIMARY AIR
DRAFT CONTROL
HOLES FOR MOUNTING PEDESTAL
PEDESTAL
CAUTION
THE STRUCTURAL INTEGRITY OF THE MOBILE HOME FLOOR MUST BE MAINTAINED. (MOVE
OPENING AND/OR REPOSITION HEATER LOCATION IFNECESSARY).
SECTION IV
RESIDENTIAL FREESTANDING INSTALLATION

Page 15
3. Place unit on pad making sure minimumum clearance specifications are met.
4. Lightly mark with a pencil the location of pedestal on protective pad.
5. Next, remove the four (4) screws holding heater to stand. Position heater out of the way of
installation area.
6. Check that pedestal stand is still aligned with marks on the protective pad, now mark
outside air opening in bottom of pedestal stand on to the pad.
7. Mark center line of outside air opening. Set stand aside for now.
8. Cut a 4 1/4" diameter hole in pad and continue through floor.
CAUTION. The structural integrity of mobile home floor must be maintained.
(Move opening and/or reposition heater location if necessary).
9. Now, reposition pedestal stand on pad being sure to line stand up with reference marks on
pad.
10. Using an electric drill and 3/8" masonry bit, drill four (4) holes in the protective pad using
holes in the bottom of the pedestal stand as a guide. Be careful to drill only through pad and
not into floor. Change the bit to a 1/4" metal bit and drill through floor.
11. Using four (4) 3/8" x 1-1/2" lag bolts provided, secure pedestal stand and pad to floor
of mobile home.
12. Obtain outside air duct from the box in pedestal kit marked FA P21B.
13. Slip duct down through the 4-1/4" hole until the face of outside air duct with screen wire,
contacts bottom of pedestal.
14. Secure outside air duct to inside bottom of pedestal using four (4) #10x1 screws provided.
(See Figure 13).
15. Set heater back onto stand and resecure using screws.
16. NOTE: If home is underpinned, you must duct through underpin as shown. (See Figure 14).
UNDER SIDE OF MOBILE HOME FLOOR
OUTSIDE AIR DUCT
FLOOR PROTECTOR PAD
PEDESTAL
OUTSIDE AIR DUCT THROUGH
UNDERPINNED.
OUTSIDE AIR DUCT THROUGH FLOOR WHEN
MOBILE HOME IS NOT UNDERPINNED.
(4) 3/8" x 1-1/2"
(4) #10x1
CAUTION
IF A THICK FLOOR PROTECTOR IS USED, YOU MAY HAVE TO
USE LONGER LAG BOLTS.
Figure 13 Figure 14

Page 16
Chimney
This model is designed for connection to any listed 2100º UL103 HT chimneys and parts.
Follow chimney manufacturer's instructions carefully.
This room heater must be converted to (1) a chimney complying with the requirements for
Type HT chimneys in the Standard for chimneys, Factory-Built, Residential, Type and
Building Heating Appliance, UL 103 or (2) a code approved masonry chimney with a flue
liner.
Floor Protection:
Floor protection must be 3/8” minimum thickness non-combustible material or equivalent.
How to use alternate materials and how to calculate equivalent thickness
An easy means of determining if a proposed alternate floor protector meets requirements listed
in the appliance manual is to follow this procedure:
1. Convert specification to R-value:
R-value is given—no conversion is needed.
K-factor is given with a required thickness (T) in inches:
C-factor is given: R=1/C
2. Determine the R-value of the proposed alternate floor protector.
Use the formula in step (1) to convert values not expressed as “R”
For multiple layers, add R-values of each layer to determine the overall R-value.
3. If the overall R-value of the system is grater than the R-value of the specified floor protec-
tor, the alternate is acceptable.
Example:
The specified floor protector should be 3/4” thick material with a K-factor of 0.84.
The proposed alternate is 4” brick with a C-factor of 1.25 over 1/8” mineral board with a
K-factor of 0.29.
Step (a): Use formula above to convert specification to R-value. R= 1/K x T = 1/0.84 x .75 =
0.893
Step (b): Calculate R of proposed system. 4” brick of C=1.25, therefore Rbrick = 1/C = 1/1.25
=0.80 1/8” mineral board of K = 0.29, therefore Rmin.bd. =1/029 x0.125 = 0.431
Step (c): Compare proposed system R of 1.231 to specified R of 0.893. Since proposed
system R is greater than required , the system is acceptable.
Definitions:
Install in accordance with 24 CFR, Part 3280 (HUD).
Thermal conductance = C = Btu = W
(hr)(ft²)(°F) (m²)(°K)
Thermal conductance = K = (Btu)(inch) = W= (Btu)
(hr)(ft²)(°F) (m)(°K) (hr)(ft)(°F)
Thermal conductance = R = (ft²)(hr)(°F) = (m²)(°K)
Btu W

Page 17
PREPARING THE ROOM HEATER LOCATION
1. Select an installation location that will give the best airflow from the front of the heater to
the remainder of the home.
2. Place the protective floor pad in position.
3. Place unit on pad making sure minimum clearance specifications are met.
4. If connecting to an existing masonry flue, first ensure that flue conforms to the NFPA-211
Code and/or consult your local code for proper procedures.
NOTE: This model is designed for connection to: any Listed 2100° UL 103 HT. TYP chimney
also any Listed UL DVL Close Clearance Pipe or Single wall minimum 24 ga. Blued or Black
Pipe. Follow pipe manufacturer’s instructions carefully.
CHIMNEY
This room heater must be converted to (1) a chimney complying with requirements for Type
HT chimneys in the Standard for Chimneys, Factory-Built, Residential, Type and Building
Heating Appliance, UL 103, or (2) a code approved masonry chimney with flue liner.
HOW TO LOCATE CHIMNEY EXIT AND INSTALL
Residential Installation
A. Vertical Exit using (6" Single Wall minimum 24 ga. blued or black pipe and any
Listed 2100° UL 103 HT. chimney).
Without optional close clearance shield and pipe shield.
NOTE: For minimum clearances (See Page 18, Figure 15).
1. Suspend a plumb bob from ceiling above unit so that weight is hanging in the center of
flue exit. (A small weight on a string will serve as a plumb bob). Mark ceiling where
string is suspended to locate center of chimney.
2. After locating center of hole, install ceiling support box, chimney or chimney connector,
flashing, and rain cap, per chimney manufacturer’s instructions and local building codes
for installation through combustible walls or ceilings.
3. Now connect stove and ceiling support box using 6" Single Wall minimum 24 ga. blued
or black pipe (DO NOT USE GALVANIZED PIPE). Connect each section so crimped
end faces downward and secure each section to each other using at least three (3) sheet
metal screws or rivets. Single wall pipe is to be connected with (3) sheet metal screws or
rivets to connector collar on heater. (See Page 18, Figure 16).
4. NOTE: If your local code requires outside air for residential installation, refer to pages
14-15 for outside air installation.
CAUTION: Certain installation types require the use of certain chimney types.
Please follow these instructions exactly.

Page 18
A. Vertical exit using (6" Single Wall minimum 24ga. blued or black
pipe and any listed 2100° UL 103 HT. TYPE Chimney)
Without optional close clearance shield and pipe shield
Model 21 minimum clearance to combustibles
NOTE: All clearances are to combustibles without close clearance shields and pipe shield, using 6"
Single Wall minimum 24ga. blued or black pipe and minimum floor protector. The clearances above
may be reduced. Follow NFPA-211 codes if available or follow instructions on (Pages 21, 22 or
Pages 25, 26).
BACK WALL
SIDE WALL
A
E
B
F
CC
D
G
C
C
Figure 16
SINGLE WALL
CONNECTOR PIPE
CEILING SUPPORT
CEILING
INSTALLATION
FLASHING
CONTEMPORARY CAP
STORM COLLAR
DO NOT OBSTRUCT
CAULK
NEW BUCK
SIDE
WALL
BUCK STOVE
LISTED 2100° UL 103 HT
TYP. CHIMNEY
RADIATION SHIELD
LISTED 2100° UL 103 HT TYP.
Figure 15
BACK WALL
SIDE WALL
A
E
B
F
CC
D
G
A
E
B D
F
BACK WALL
SIDE WALL
PROTECTOR PAD
G
A B C D E F G
MODEL 21 25” 13" 13" 15.5" 8" 6" 16"