Thelin T-4000 User manual

T-4000 WOOD STOVE
Wood Stove Heater Owner's Manual
Installation and Operating Instructions
SAFETY NOTICE
HEATER MUST BE PROPERLY INSTALLED AND MAINTAINED OR A HOUSE FIRE MAY
RESULT.
FOR YOUR SAFETY, FOLLOW THE INSTALLATION INSTRUCTIONS.
CONTACT LOCAL BUILDING OFFICIALS ABOUT RESTRICTIONS AND INSTALLATION
INSPECTION.
FAILURE TO COMPLY WITH OWNER'S MANUAL INSTRUCTIONS WILL VOID
WARRANTY.
PLEASE LEAVE THIS MANUAL WITH THE OWNER!!
TH-REF-SLS-235 Rev. B 2017
Please read this entire manual before installation.
Save these instructions.
Made in the USA by:
775-241-2586

T-4000 WOOD STOVE HEATER
CONTENTS
2-10-3 Rule, 11
Accessories, 7
Air Lever, 19
Ash Disposal, 21
Ash Drawer, 17
Ash Removal, 21
Back Fan, 23
Blower Assembly, 21
Burn Guidelines, 19
Burn Rates, 20
Densified Logs, 20
Fuel Selection, 20
Overfiring, 20
Starting a Fire, 19
Burning Process, 17
Chimney
Connector, 8, 12
Draft, 11
Height, 11
Masonry, 14
Placement, 11
Prefabricated Metal, 13
Support by Ceiling, 13
System, 8, 12, 13
Through Outer Wall and Enclosed, 14
Vacation A-Frame with Steep Pitch Roof, 14
with Pair of Offset Elbows, 13
Clean Out and Maintenance, 21
Clearance to Combustibles, 6, 10
Clearances
Combustibles, 6
Floor Protection, 11
Mobile Home, 16
Venting, 9
Connection
Masonry Chimney, 14
Mobile Home Installation, 15
Prefabricated Metal Chimney, 13
Creosote, 21
Dimensions, 7
Exhaust Air Flow, 19
Fire Safety, 8
Floor Protection, 9, 11
Flue Collar, 12
Flue Connection, 12
Glass Cleaning, 22
Glass Replacement, 22
Installation
Canada, 11
U.S., 11
Installation and Operating Instructions, 4
Installation Materials, 8
Installation of Optional Blower, 20
Laboratory Listing Label, 6
Maintenance
Ash Disposal, 21
Ash Removal, 21
Creosote Build Up, 21
Glass Cleaning, 22
Masonry Chimney, 15
Mobile Home
Clearances, 16
Installation, 15
One-Story House with Attic, 13
Operating Instructions, 17
Optional Blower
Installation, 20
Part Number, 20
Outside Air Kit, 17
Contents, 17
Installation, 17
Outside Air Mount, 16
Overfiring, 20
Plated Surfaces
Cleaning, 22
Primary Air Flow, 18
Procedures
Mobile Home, 15
Safety and Listing Information, 7
Safety Guidelines, 4
Secondary Air Flow, 18
Termination Cap, 8
Thimble, 8
Venting Systems, 8
Vermiculite Insulation, 22, 23
Warranty Information, 24

T-4000 WOOD STOVE HEATER
FIGURES
Figure 1. Laboratory Listing Label......................................................................................................................... 6
Figure 2. Dimensions .............................................................................................................................................. 7
Figure 3. Floor Protection ....................................................................................................................................... 9
Figure 4. Clearance to Combustibles .................................................................................................................... 10
Figure 5. 2-10-3 Rule............................................................................................................................................ 11
Figure 6. Chimney Connector and Flue Collar..................................................................................................... 12
Figure 7. Chimney with Pair of Offset Elbows..................................................................................................... 13
Figure 8. One-Story House with Attic .................................................................................................................. 13
Figure 9. Vacation A-Frame with Steep Pitch Roof ............................................................................................. 14
Figure 10. Chimney Through Outer Wall and Enclosed ...................................................................................... 14
Figure 11. Masonry Chimney ............................................................................................................................... 15
Figure 12. Masonry Chimney ............................................................................................................................... 15
Figure 13. Mobile Home Installation.................................................................................................................... 16
Figure 14. Outside Air Mount............................................................................................................................... 16
Figure 15. Outside Air Kit .................................................................................................................................... 17
Figure 16. Ash Drawer.......................................................................................................................................... 17
Figure 17. Primary Air Flow................................................................................................................................. 18
Figure 18. Secondary Air Flow............................................................................................................................. 18
Figure 19. Exhaust Air Flow................................................................................................................................. 19
Figure 20. Air Lever ............................................................................................................................................. 19
Figure 21. Blower Assembly ................................................................................................................................ 21
Figure 22. Placement of Vermiculite Insulation ................................................................................................... 23
Figure 23. Back Fan.............................................................................................................................................. 23

T-4000 WOOD STOVE HEATER
4
INSTALLATION AND OPERATING
INSTRUCTIONS
This manual contains installation and operating
instructions for your new T-4000 wood stove.
Correct and proper installation is mandatory.
Failure to comply with the instructions will void
your warranty and could lead to a house fire, bodily
injury, and even death. Please note the following
safety guidelines:
Important Safety Guidelines
1. Fire Protection. If this room heater is not
properly installed, a house fire may result. To
reduce risk of fire, follow the safety
instructions. Contact local building or fire
officials about restrictions and installation
inspection requirements in your area. A permit
is required to protect your insurance coverage.
2. Never use gasoline, kerosene, lantern fuel,
charcoal lighter, or similar liquids to start or
“freshen up” a fire in this heater. Keep all such
liquids away from this heater.
3. During operation do not overfire! Overfiring
occurs if any part of the heater starts to glow.
OVERFIRING VOIDS YOUR WARRANTY.
Close the air control completely until the
glowing has stopped.
4. Always use a metal container to dispose of
ashes. Always allow stove to cool down before
disposing of ashes.
5. Store wood fuel in a dry location. DO NOT burn
wet or green wood in this heater.
6. This heater is approved for cord wood and
densified wood fire logs. Do not burn treated
wood, fireplace logs with wax or petroleum
additives, driftwood with salt, garbage,
charcoal, etc. Burning materials other than wood
under adverse conditions may generate carbon
monoxide in the home and could lead to illness
or possible death.
7. Existing chimney systems must be checked
thoroughly before installation. Seek professional
help if installing into an existing metal or
masonry chimney.
8. Do not permit creosote or soot to build up in
your chimney or inside the firebox. Excessive
creosote buildup indicates wet or green wood is
being used.
9. Do not connect this appliance to a chimney flue
already serving another appliance. Do not
connect to any air distribution duct or system.
10. Note minimum clearance to combustibles.
These clearances are shown in Figure 4 and
must be complied with.
11. Build fire on firebrick floor of appliance. Do not
use grates, irons, or other methods to support the
fuel.
12. RISK OF FIRE! Do not operate stove with door
open.
13. HOT WHILE IN OPERATION! Keep children,
pets, clothing, draperies, and furniture away
from heater. Contact can cause skin burns.
14. Do not operate without fully assembling all
components. This will void your warranty and
could present a serious safety hazard.
15. When in doubt about safety or operation refer to
National Fire Protection Code NFPA 211 (US)
or CAN/CSA-B365 (Canada).

T-4000 WOOD STOVE HEATER
5
CONSUMER INFORMATION
Model Name: T-4000 Wood Stove
Serial Number:
Date Purchased:
Dealership Purchased At:
Dealer Phone Number:
Installation By:
Additional Information:
Complete your warranty card and attach sales receipt here for future reference.

T-4000 WOOD STOVE HEATER
7
DIMENSIONS
FIGURE 2. DIMENSIONS
Accessories
Fan/Blower Option # 46000-01
Outside Air Kit # 46000-02
WARNING!
DO NOT ATTEMPT TO OPERATE THIS
WOOD STOVE WITHOUT READING AND
UNDERSTANDING THESE OPERATING
INSTRUCTIONS THOROUGHLY. FAILURE
TO OPERATE THIS APPLIANCE
PROPERLY MAY CAUSE A HOUSE FIRE.
THE OUTSIDE SURFACES OF THIS UNIT
WILL BECOME EXTREMELY HOT DURING
OPERATION. ALWAYS KEEP CHILDREN
AWAY WHILE IT IS IN USE AND DO NOT
LET ANYONE OPERATE THIS APPLIANCE
UNLESS THEY ARE FAMILIAR WITH
THESE OPERATING INSTRUCTIONS.
NEVER DRAW OUTSIDE COMBUSTION AIR
FROM A WALL, FLOOR, OR CEILING
CAVITY OR FROM ANY ENCLOSED SPACE
SUCH AS AN ATTIC OR GARAGE.
SAFETY AND LISTING
INFORMATION
These installation instructions describe the
installation and operation of the Thelin T-4000
Wood Stove. This stove meets the strictest EPA and
Washington State particulate emission standards.
The T-4000 is listed by OMNI-Test Laboratories,
Inc. to UL Safety Standard 1482 and (UM) 84-
HUD. The T-4000 is approved for mobile home
installations when not installed in a sleeping room
and when an outside combustion air kit (available
from Thelin Hearth Products) is provided. The
structural integrity of the mobile home floor,
ceiling, and walls must be maintained. The stove
must be properly grounded to the frame of the
mobile home.
Check with local building officials and code
agencies before beginning installation to ensure
compliance with local codes, including the need for
permits and follow-up inspections. Always obtain a
building permit to ensure validation of insurance
protection. Contact your local dealer for
clarification and assistance, if required.
Inspect and clean vent system frequently in
accordance with the instructions contained in this
manual. Do not connect this unit to a chimney
serving another appliance.
When using the optional blower package, route
power cord away from the unit. Do not allow cord
to lay under or on the appliance.
Do not elevate fire. Build wood fire directly on
firebrick fiber (floor of stove).
Do not overfire. If heater or chimney connector
glows, you are overfiring.
Operate with the door closed. Open only to add fuel
to the fire. Operating with the door open can cause
hot embers or sparks to fall out and a fire may result.

T-4000 WOOD STOVE HEATER
8
MATERIALS NEEDED FOR SAFE
INSTALLATION
Fire Safety: To provide reasonable fire safety,
Thelin Hearth Products recommends the following:
1. Install at least one smoke detector on each floor of
your home. They should be located away from the
heating appliance and close to sleeping areas.
2. A Class “A” fire extinguisher should be kept
near the stove to contend with any small fires
resulting from burning embers, etc.
3. Create a house evacuation plan with at least two
escape routes and have all members of the
family aware of the plan.
4. Be aware of the possibility of a chimney fire
and know what to do, such as:
a. Notify the fire department
b. Prepare occupants for evacuation
c. Close all air openings into the stove
d. While waiting for the fire department, watch
for ignition of adjacent combustibles to
stove pipe, i.e., walls, ceiling, hot embers,
and sparks from the chimney.
VENTING SYSTEMS
The venting system consists of the following:
chimney connector, thimble, chimney system, and
termination cap. They are defined as follows:
Chimney Connector
The chimney connector, also known as the flue or
stove pipe, joins the stove to the chimney (see
Figure 6). It must be 6” (152mm) minimum
diameter, 24 MSG black or blued steel, or an
approved air-insulated double wall-venting pipe.
Thimble
A manufactured or site-constructed device installed
in combustible walls through which the chimney
connector passes to attach to the chimney system. It
is intended to keep the walls and ceiling from
catching on fire.
Chimney System
A. PREFABRICATED 6” (152mm) listed high-
temperature (UL103HT or ULC S629M)
chimney. Components required by
manufacturers for installation such as the
chimney support base, firestop (as appropriate),
attic insulation shield, insulated tee, etc., are
necessary to assure a safe installation. Use only
components manufactured for the chimney
system being used (do not mix brands).
Chimney should meet NFPA 211 standards.
B. APPROVED MASONRY (see specifications in
Figure 12 and Figure 13) with at least 5/8”
(16mm) fire clay lining joined with refractory
cement or other listed system suitable for use
with wood stoves.
Termination Cap
The cap on top of the chimney system that protects
the pipe from rain, snow, and wind. Some
installations will require a special “high wind” cap
depending upon location and prevailing wind
direction. Check with your local dealer to determine
if you need a special cap.
Venting systems get extremely hot during use.
Temperatures inside the chimney may exceed 2,000
degrees F (1,100 °C) in the event of a creosote fire.
To protect against the possibility of a house fire, the
chimney system must be properly installed and
maintained. An approved, listed thimble must be
used when a connection is made through a
combustible wall to a chimney. A chimney support
package must be used when a connection is made
through the ceiling to a prefabricated chimney.
These accessories are absolutely necessary to

T-4000 WOOD STOVE HEATER
9
provide safe clearances to combustible wall and
ceiling materials. All venting and pipe systems
come with instructions. Follow these
manufacturer’s instructions carefully to avoid safely
problems later.
The T-4000 may be connected to a lined masonry
chimney or a listed high-temperature, prefabricated,
approved metal chimney. DO NOT connect it to a
chimney serving another appliance. Doing so will
affect the safe operation of both appliances and will
void your warranty.
LOCATING YOUR STOVE
Plan the stove location carefully. It is a good idea to
plan on paper, using exact measurements, before
cutting any holes in walls or ceiling. Consider
safety, convenience, traffic flow, and the fact that
the stove will need a chimney and chimney
connector. When not using an existing chimney
system, place the stove where there will be a clear
passage for a factory-built, listed chimney through
the ceiling and roof.
Avoid the possibility of fire hazard by maintaining
the designated clearance to combustibles (see
FIGURE 1). Attic and wall insulation must not
touch the chimney. Maintain the designated air
space clearance around the chimney. Each
manufacturer of chimney pipe and venting lists
clearances with their pipe. Read instructions
carefully. The space around the chimney is
necessary to allow natural removal of heat from the
area. Insulation in this space will cause heat to build
up, and this can ignite the wood framing inside the
wall or attic. NOTE: Clearances may only be
reduced by means approved by the regulatory
authority having jurisdiction.
FIGURE 3. FLOOR PROTECTION

T-4000 WOOD STOVE HEATER
10
FIGURE 4. CLEARANCE TO COMBUSTIBLES
Please use these diagrams when locating stove in a room.
Please note “Cornerwall” means from the back of the stove to the corner.
13”
14.5”
19”
19”
13”
14.5”

T-4000 WOOD STOVE HEATER
11
FLOOR PROTECTION
The T-4000 requires a non-combustible floor pad
extending beneath the heater and to the front and
sides as indicated (See FIGURE 3). This protector
must be non-combustible, such as wonder board or
similar product, which will protect floor from
radiant heat given off by the unit and from sparks
and falling embers. A thin layer of brick or ceramic
tile over a combustible floor is not sufficient and
will not meet code.
U.S. Installation
It is necessary to install a floor protector of 3/8”
thick metal clad millboard or equivalent at least 16”
in front of glass door and 8” to both sides of the
door opening. Open the door and measure 8” from
the side edge of the opening in the face of the stove.
Canada Installation
Similar floor protection must be provided 18” in
front and 8” from the sides and rear of the stove.
Non-combustible floor protection must also extend
beneath the flue pipe when installed with horizontal
venting and extend 2” beyond each side.
CHIMNEY HEIGHT AND DRAFT
The T-4000 was designed and tested on a 6”
(152mm) diameter chimney with a height of twelve
(12) to fourteen (14) feet (3.66 to 4.27m) measured
from the base of the stove to the top of the
termination cap. The performance of your heater
could be affected when varying from these
measurements. In addition, exterior conditions such
as roofline, surrounding trees, prevailing winds, and
nearby buildings and hills could affect the draw and
stove performance. Your local dealer and/or hearth
professional should be able to help in determining
the best chimney height for your particular setting.
FIGURE 5. 2-10-3 RULE
The 2-10-3 Rule
A masonry chimney or listed factory-built 103HT
chimney must be the required height above the roof
and any other nearby obstructions. The chimney
must be at least 3’ (91cm) higher than the highest
point where it passes through the roof and at least 2’
(61cm) higher than any portion of the roof within
10’ (305cm) measured horizontally.
NOTE: This is a safety requirement and is not
meant to ensure proper flue draft. The pipe may
have to go higher to ensure proper draft. We
recommend a minimal total height of 12’ (366cm),
measured from the flue collar to the top of the
chimney (not including the cap).
WARNING!
CHIMNEY CONNECTOR IS TO BE USED
ONLY WITHIN THE ROOM BETWEEN THE
STOVE AND CEILING OR WALL. THE
CONNECTOR SHALL NOT PASS THROUGH
AN ATTIC OR ROOF SPACE, CLOSET OR
SIMILAR CONCEALED SPACE, FLOOR, OR
CEILING. MAINTAIN MINIMUM
CLEARANCES TO COMBUSTIBLES AS
REFERRED TO IN FIGURE 4. ALWAYS
FOLLOW CHIMNEY CONNECTOR
MANUFACTURER’S INSTRUCTIONS FOR
PROPER INSTALLATION.

T-4000 WOOD STOVE HEATER
12
FIGURE 6. CHIMNEY CONNECTOR AND
FLUE COLLAR
WARNING!
IF INSTALLING THE T-4000 INTO A
MASONRY CHIMNEY, ALWAYS BE SURE
THE CHIMNEY IS IN GOOD CONDITION
AND THAT IT MEETS THE MINIMUM
STANDARDS OF THE NATIONAL FIRE
PROTECTION ASSOCIATION (NFPA)
STANDARD 211. A LICENSED CHIMNEY
SWEEP CAN INSPECT TO DETERMINE THE
QUALITY OF YOUR CHIMNEY. A
FACTORY-BUILT (METAL) CHIMNEY
MUST BE 6” UL 103 HT.
DO NOT CONNECT THIS UNIT TO A
CHIMNEY FLUE SERVING ANOTHER
APPLIANCE!
FLUE CONNECTION
This appliance is made with a 6” (152mm) diameter
flue collar connector attached to the stove.
Changing the diameter of the chimney connector
can affect the draft and cause poor performance. It
is not recommended to use offsets or elbows at
altitudes above 4,000-foot sea level or when there
are other factors that can affect flue draft.
Note: There are two separate and different parts to a
flue system: the chimney connector (defined on
page 8) and the chimney system itself (defined on
page 8).
1. Chimney Connector: This must be at least 24-
gauge mild steel or 26-gauge blue steel. The
sections must be attached to the stove and to
each other with the crimped (male) end pointing
toward the stove (see FIGURE 6). All joints,
including the connection at the stove collar,
should be secured with three sheet metal screws.
Make sure to follow the minimum clearances to
combustibles (see FIGURE 4). Where passage
through the wall or partition of combustible
construction is desired, the installation shall
conform to CAN/CSA-B365 (check with local
building officials).
2. Factory-built Listed Chimney Connector
(vented double wall): This type of connector
must be used when installing this unit into a
mobile home. The listed connectors must be the
same brand as the listed chimney system to
ensure proper fit and seal.
3. Double wall pipe may also be used above the
connector to reduce clearance. Follow pipe
manufacturer’s instructions in order to reduce
clearance to combustibles.

T-4000 WOOD STOVE HEATER
13
CHIMNEY SYSTEM DIAGRAMS
Connection to a Prefabricated Metal Chimney
There are basically two methods of metal chimney
installation. One is to install the chimney inside the
room directly up and through the ceiling and roof.
The second method is to install an interior and
exterior chimney that runs up outside of the house.
(See FIGURE 7 and FIGURE 8 for both methods.)
Both methods require special chimney pipe pieces
such as ceiling support packages, firestops, “T”
section packages, insulation shield, roof flashing,
chimney cap, wall pass through device, etc. The
components illustrated may not look exactly like the
system purchased (brand to brand may vary), but
these demonstrate the basic components needed for
proper and safe installation.
REMEMBER: Follow the manufacturer’s
installation instructions and maintain the specified
clearance distances.
FIGURE 7. CHIMNEY WITH PAIR OF
OFFSET ELBOWS
FIGURE 8. ONE-STORY HOUSE WITH
ATTIC

T-4000 WOOD STOVE HEATER
14
FIGURE 9. VACATION A-FRAME WITH
STEEP PITCH ROOF
FIGURE 10. CHIMNEY THROUGH OUTER
WALL AND ENCLOSED
Masonry Chimney
Have chimney inspected to make sure that it
conforms to the NFPA 211 Standard 211. It must
have at least a 5/8” (16mm) fire clay liner or a listed
chimney liner system. Make sure there are no
cracks, loose mortar, or other signs of deterioration
and blockage. It is best to have chimney inspected
by a professional before the stove is installed to
ensure it is not too large for the stove. NFPA 211
allows the cross-sectional area of the flue to be no
more than three times the cross-sectional area of the
flue collar of the stove (28 x 3 = 84 square inches).
It is recommended that a chimney with a larger
diameter be relined, since the oversized flue can
cause poor performance and contribute to the
formation and accumulation of creosote.
When connecting the stove through a combustible
wall to a masonry chimney, special methods are
needed. There are several ways to make this
connection. Refer to the masonry diagrams in
Figure 11 and Figure 12, and check with your local
building officials to make sure the installation
conforms with CAN/CSA-B365.

T-4000 WOOD STOVE HEATER
15
FIGURE 11. MASONRY CHIMNEY FIGURE 12. MASONRY CHIMNEY
MOBILE HOME INSTALLATION
The Thelin Hearth Products outside air/mobile
home kit (Part Number 46000-02) must be used for
installation in a mobile home. Use of alternative
material will void your warranty.
Mandatory Mobile Home Procedures
1. An outside air inlet must be provided for
combustion and must remain clear of debris,
leaves, ice and/or snow. It must be unrestricted
while the unit is in use to prevent room air
starvation which can cause smoke spillage and
an inability to maintain a fire. Smoke spillage
will set off smoke alarms.
2. Unit must be secured to the mobile home
structure by drilling holes in at least two legs
and bolting through hearth pad and into floor.
Countersink holes in legs and fill with putty for
attractive finish.
3. Unit must be grounded with #8 copper
grounding wire or equivalent and terminated at
each end with N.E.C.-approved grounding
device.
WARNING!
DO NOT INSTALL IN A SLEEPING ROOM.

T-4000 WOOD STOVE HEATER
16
4. Stove must be installed with an approved 103
HT ventilated (double wall) chimney connector,
103 HT chimney, and terminal cap with spark
arrestor. Never use a single wall connector
(stove pipe) in a mobile home installation.
5. Mobile home clearances are listed on the serial
number label on the back of the stove.
6. Floor protection requirements are found in
FIGURE 3 and must be followed exactly.
7. In Canada, this appliance must be connected to
a 6” (152mm) factory-built chimney conforming
to CAN/ULC 629M. See FIGURE 3 for Canada
floor protection requirements.
8. Use silicone to create an effective vapor barrier
at the location where the chimney or other
components penetrate to the exterior of the
mobile home.
9. Follow the chimney and chimney connector
manufacturer’s instructions when installing the
flue system for use in a mobile home. Offsets
from the vertical, not exceeding 45 degrees, are
allowed per Section 905(a) of the Uniform
Mechanical Code (UMC). Offsets greater than
45 degrees are considered horizontal and are
also allowed, providing the horizontal does not
exceed 75% of the vertical height of the vent
system.
10. Top sections of the chimney must be removable
to allow maximum clearance of 13.5’ from
ground level for transportation purposes.
CAUTION!
THE STRUCTURAL INTEGRITY OF THE
MOBILE HOME FLOOR, WALL, CEILING,
AND ROOF MUST BE MAINTAINED. DO
NOT CUT THROUGH FLOOR JOIST, WALL
STUD, CEILING TRUSS, ETC.
FIGURE 13. MOBILE HOME
INSTALLATION
FIGURE 14. OUTSIDE AIR MOUNT

T-4000 WOOD STOVE HEATER
17
OUTSIDE AIR KIT INSTALLATION
Kit Contents
Outside Air Box, 4 screws, and 1 hose clamp (flex
line and termination cap not included).
Items Needed for Installation
4” flex pipe in the length needed for installation
(should not exceed 5’), screwdriver, silicone
sealant, drill and saw for cutting hole through wall
as necessary.
Installation
Cut a 4” minimum hole in wall or floor as
necessary. Attach outside air box to bottom rear of
stove as per diagram. Attach flex pipe to box with
hose clamp. Run flex pipe either through wall or
floor into vented crawl space or outside. Do not put
flex into non-vented crawl space. Attach
termination cap with rodent guard to end of flex
outside. Seal between wall or floor and pipe with
silicone to prevent moisture and air penetration.
WARNING!
NEVER DRAW COMBUSTION AIR FROM A
WALL, FLOOR, OR CEILING CAVITY OR
FROM ANY ENCLOSED SPACE SUCH AS
AN ATTIC OR GARAGE.
FIGURE 15. OUTSIDE AIR KIT
OPERATING INSTRUCTIONS
The T-4000 Wood Stove is an advanced
technology, clean-burning heater that has surpassed
all EPA and Washington State (the toughest in the
U.S.) emission standards. Because this technology
allows wood to burn in a different way than was
customary in earlier years, it is important to
understand how the stove works in order to achieve
maximum performance and efficiency.
Burning Process
The T-4000’s secondary burn technology allows for
virtually smokeless burns providing the stove is
correctly operated. It is helpful to understand this
burning process in order to help create a healthy
environment and enhance air quality even while
burning a wood stove. This can achieve this by
burning the heater responsibly. Below is a
description of how the technology works:
FIGURE 16. ASH DRAWER
Blower
Option
Outside Air
Adaptor
Ash Drawer
4” Flex Line (not included)
Lift Up
Ash Cover
Plate to
Sweep
Ashes
into Ash
Drawer
Cut Away View Showing
Ash Cover Plate

T-4000 WOOD STOVE HEATER
18
Fire requires three things to burn: fuel, air, and heat.
On start up, the first stage of burning, the wood is
heated to a temperature high enough to boil water
(212 degrees F), and it will not get any hotter until
the water is evaporated. This process takes heat
from the coals and tends to cool the stove. This is
also why burning seasoned, dried wood is so
important. The secondary state of wood burning
occurs when the wood gives off flammable gases
that burn above the fuel with bright flames. During
the secondary stage it is important that the flames
be maintained and not allowed to go out. This will
ensure the cleanest possible fire. The final stage of
burning is called the charcoal state, this occurs
when the flammable gases have been mostly burned
and the coals burn with a blue flame. This is a
naturally clean burn and new fuel should be
deposited while these lively hot coals remain. This
will ensure immediate combustion and start the
clean burning cycle over again. The T-4000
addresses this burn cycle in the most efficient
manner by the following:
On start up, pull the primary air adjustment all the
way out (see FIGURE 20), as this will allow for the
quickest and hottest initial burn. At this point there
is sufficient air to create a hot fire. As the primary
air enters the firebox it is preheated and enters the
fire chamber in front of the glass door, helping to
keep it clean. The preheated primary air allows the
temperature to rise to the point where secondary
combustion takes place (air mixing with the
unburned gasses creates secondary combustion).
This usually takes about 15 to 20 minutes. This is
demonstrated when the primary air is closed and the
secondary air tubes (see FIGURE 18) begin igniting
the gases exiting the heater. Look to the top of the
firebox and notice the secondary
FIGURE 17. PRIMARY AIR FLOW FIGURE 18. SECONDARY AIR FLOW

T-4000 WOOD STOVE HEATER
19
combustion taking place. At this point close down
the primary air as far as possible without losing
secondary combustion. This will take some trial and
error but it is crucial to monitor and learn this
process to ensure the cleanest possible burn. This
process can be regulated by simply pushing the
primary air control lever in or out. As the load of
firewood burns down, open the primary air all the
way before opening the door. This will prevent
smoke spillage and give the coals a fresh supply of
air to ignite the new fuel load. Now, let’s get the
heater burning!
FIGURE 19. EXHAUST AIR FLOW
FIGURE 20. AIR LEVER
FIRST BURN AND BURN GUIDELINES
Prior to First Fire
Remove labels from glass. Clean glass and gold
surfaces with glass cleaner and soft cloth to
prevent staining from fingerprint oils.
CAUTION
NEVER USE GASOLINE, GASOLINE-TYPE
LANTERN FUEL, KEROSENE, CHARCOAL
LIGHTER FLUID, OR SIMILAR LIQUIDS TO
START OF “FRESHEN UP” FIRE IN AP
PLIANCE. KEEP ALL SUCH LIQUIDS AWAY
FROM THE HEATER WHILE IT IS IN USE.
Starting a Fire
1. Pull out primary air lever all the way (see
FIGURE 20).
2. Place several wads of crushed paper on the
firebox floor and add several small pieces of
kindling on top of the paper.
3. Light the paper in the stove. Once the paper and
kindling are burning, add several 3” or 4” logs
of seasoned, dry wood. Be careful not to
smother the fire with the small logs. Stack the
logs so there is plenty of airflow between them.
Shut the door.
4. As the fire takes off and begins to burn intensely
gently open the door and add more wood. When
the fire is burning full and the door is full of
flame begin the adjustment for secondary
combustion.
5. Push the primary air lever in and watch the
secondary combustion tubes on the top of the
firebox. When secondary combustion occurs, a
gentle, rolling flame will emit from the tubes.
Keep the lever in the position that allows for
secondary combustion but does not allow the
fire to go out. This will take some practice—
trial and error—but you will quickly learn the
best position for the lever in order to achieve the
maximum clean burn without wasting wood fuel
unnecessarily.

T-4000 WOOD STOVE HEATER
6. Always open the primary air lever before
opening the door to refuel. It is a good practice
to run the stove with the lever open 10 to 15
minutes per day to keep air passageways clean.
ADDITIONAL BURN INFORMATION
Fuel Selection
It is a waste of energy to burn unseasoned wood of
any kind. Burn only dry, seasoned wood. Store
wood under cover, out of the rain and snow.
CAUTION
DO NOT PLACE OR STORE WOOD WITHIN
CLEARANCE TO COMBUSTIBLE
SPECIFIED
ON LISTING LABEL (SEE FIGURE 1) OR
WITHIN AREA USED FOR STARTING FIRE
AND REMOVING ASHES.
Dry, well-seasoned wood will minimize the chance
of creosote formation and will give you the most
efficient fire. Even dry wood contains at least 15%
moisture by weight, and should be burned hot
enough to keep the chimney hot for as long as it
takes to dry the wood out. Check for smoke coming
out of the chimney. Periodically check the smoke
coming out of the chimney, in order to determine
how clean the stove is burning. The goal is 0%
opacity. Opacity is measured by how much can be
seen through the smoke (i.e., 100% opacity means
no object can be seen through the smoke).
Densified Logs
It is permissible to burn densified wood logs in this
heater. Do not use logs that are treated with wax,
paraffin, petroleum bi-products, etc. Densified
logs are composed of compressed sawdust or wood
shavings, without any binder added. Read the label
carefully before burning.
Burn Rates
Control the rate of burn by moving the primary air
lever. The more you can close it and still maintain
secondary combustion, the better the burn rate will
be. If, more heat is needed, open the control lever.
Note: by doing this more heat will be consumed. If
more heat is needed when large quantities of wood
is being consumed, consider installing the blower
option.
NOTE
THE SPECIAL HIGH-TEMPERATURE
PAINT WILL CURE AND EMIT SOME
SMOKE AND ODORS DURING THE FIRST
BURN. THIS IS NORMAL. WE
RECOMMEND OPENING A WINDOW
UNTIL THE ODOR DISSIPATES AND THE
PAINT IS CURED.
Overfiring
DO NOT OVERFIRE. Burning trash in the stove,
too much wood, flammable liquids, or too much air
can create an overfire situation. This can be
dangerous. If the chimney or chimney connector or
stove glow red, the stove is overfired. This
condition can ignite any creosote build-up in the
chimney and cause a house fire. If you overfire,
immediately close the air control and door, if open,
to reduce the supply of air to the fire. Overfiring
will void your warranty!
MAINTENANCE OF BLOWER
All Thelin Hearth Products T-4000 stoves are
equipped with an blower that will move
more heat into the room and thus make the stove
more efficient. Please follow the steps for removal
and service as outlined here.
Step-By-Step Procedure for Installing Blower (see
instruction sheet included at end of manual)
1. Removal and replacement of blower assembly to
stove body is shown in FIGURE 21. (See FIGURE
23 for a larger
picture.)
20