HearthStone WFP-100 User manual

WFP-100 Model 8420
Manual: 6400-40405
R: 08/11/21
FP15 Waterloo
Manufactured for: HearthStone Quality Home Heating Products, Inc. 317 Stafford Avenue,
Morrisville VT 05661
PLEASE READ THIS ENTIRE OWNER’S MANUAL BEFORE YOU INSTALL AND USE YOUR
NEW WFP-100 FIREPLACE.
SAVE THIS OWNER’S MANUAL FOR FUTURE REFERENCE
WFP-100
(Model 8420)
Woodstove
OWNER’S MANUAL
Installation And
Operating Instructions
Listed to standards ULC-S610 and UL 127
CAUTION: Do not attempt to modify or alter the construction of the fireplace or its
components. Any modification or alteration of construction may void the
warranty, listings and approvals of this system. In that case, HearthStone Quality
Home Heating Products, Inc. will not be responsible for damages. Install the
fireplace only as described in these instructions.
This manual is available for free download on the manufacturer’s web site. It is a
copyrighted document. Re-sale is strictly prohibited. The manufacturer may update
this manual from time to time and cannot be responsible for problems, injuries, or
damages arising out of the use of information contained in any manual obtained
from unauthorized sources.
WARNING: This product can expose you to
chemicals including glass wool fiber and carbon
monoxide which are known to the State of California to
cause cancer, birth defects or other reproductive harm.
For more information go to www.P65Warnings.ca.gov
California Prop 65

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WFP-100 Model 8420
Notes on Fireplace Operation and Efficiency
Rating:
You have purchased a HearthStone WFP-100 tested to ASTM WK47329. This fireplace is certified to comply with the U.S.
Environmental Protection Agency 2020 particulate emissions standard using cord wood. It is certified at 1.6 g/hr emission
rate and under specific test conditions has been shown to deliver heat at rates ranging from 16,610 to 43,021Btu/hr
(output).
This wood heater has a manufacturer-set minimum allowable low burn rate that must not be altered. It is against federal
regulations to alter this setting or otherwise operate this wood heater in a manner inconsistent with operating instructions in
this manual.
Please refer to the Warranty section of this manual for registration instructions. In case of warranty claims, please contact
the point of original sale or the nearest authorized HearthStone dealer. All warranty claims are processed by our dealer
network. Authorized HearthStone dealers can be located at www.HearthStonestoves.com.
This heater is designed to burn natural wood only. Higher efficiencies and lower emissions generally result when burning
air dried seasoned hardwoods, as compared to softwoods or to green or freshly cut hardwoods. DO NOT BURN:
Garbage, lawn clippings, material containing rubber (including tires), materials containing plastic, waste petroleum products
paints or paint thinners, asphalt products, materials containing asbestos, construction or demolition debris, railroad ties,
pressure treated wood, manure or animal remains, salt water driftwood or other previously salt water saturated materials,
unseasoned wood, paper products, cardboard, plywood or particleboard. This prohibition against burning these materials
does not prohibit the use of fire starters made from paper, cardboard, saw dust, wax and similar substances for the
purpose of starting a fire in an affected wood heater. Burning these materials may result in a release toxic fumes or render
the heater ineffective and cause smoke.
Following the maintenance guidelines set forth in this manual will help insure the efficient use of your wood heater and
minimize visible emissions. Having your fireplace inspected by a trained professional on a regular basis will greatly
increase the potential for recognizing potential impacts to efficiency.
Proper draft is important to the efficient operation of your heater. Refer to the Normal Operation section of this manual for
information regarding adequate draft. Both excessive and sub-minimum draft can affect the efficiency of your wood heater.
Excessive draft can lead to over-consumption of fuel, lower overall heating capacity of the fireplace and potential over
firing. Low draft can result in inefficient burns, low heat output, expulsion of smoke into the living area when fireplace doors
are opened and an increased potential for build-up of flammable materials in the flue.
Efficiency:
Efficiency was captured using CSA B415-10 methodology. A weighted average was used to calculate the overall efficiency
across all of the 3 burn rate categories using the higher heating value (HHV).
To maximize the efficiency of your wood fireplace make sure it is sized properly for the space you plan to heat. An
oversized fireplace will often be forced to burn at a lower and dirtier burn rate. Consult with your dealer for sizing and
correctly placing the fireplace in your home. An incorrectly placed fireplace can greatly reduce efficiency. Maximizing the
efficiency of your fireplace will heat your house quickly, burn cleaner and use less wood.
Refer to the Choosing Firewood section of this manual for appropriate fuel selection. Seasoned firewood is typically at or
near 20% moisture content. This can be measured with any number of hand-held moisture meters available through your
local hearth shop. Follow instructions included in the meter you purchase to measure fuel wood moisture content. Burn
only dry, seasoned wood as using wet wood will greatly reduce your efficiency.
CO Emissions:
The WFP-100 has an average CO emission rate of 157.4 g/h. Wet wood or unapproved fuel described above can greatly
affect the emissions of a wood burning fireplace.
Smoke/Fire/CO Detectors:
It is highly recommended that smoke and CO detectors be installed throughout the heated space when a wood burning
heater is installed. Be certain to install these devices not only in the area where the wood appliance is located, but also
in bedrooms, hallways leading to other areas of the house and all common areas of the heated space. Check the
batteries in these devices and assure operation by performing whatever test operations are recommended by the
manufacturer.

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WFP-100 Model 8420
TABLE OF CONTENTS
PART A - OPERATION AND MAINTENANCE .................................................................................................... 5
1. Safety Information ......................................................................................................................................... 5
1.1 Summary of Operation and Maintenance Cautions and Warnings .......................................................... 5
2 General Information ...................................................................................................................................... 7
2.1 Appliance performance ............................................................................................................................. 7
2.2 General Features ...................................................................................................................................... 7
2.3 Dimensions............... ................................................................................................................................ 8
2.4 Zone Heating and How to make it work for you ....................................................................................... 8
2.5 The Benefits of Low Emissions and High Efficiency ................................................................................ 9
2.6 The HEARTHSTONE Commitment to You and the Environment ............................................................ 9
2.6.1 What is Your New Fireplace Made Of? .......................................................................................... 9
3 Fuel ......................................................................................................................................................... 10
3.1 How to Prepare or Buy Good Firewood .................................................................................................. 10
3.1.1 What is Good Firewood? .............................................................................................................. 10
3.1.2 Tree Species ................................................................................................................................. 10
3.1.3 Log Length .................................................................................................................................... 10
3.1.4 Piece Size ..................................................................................................................................... 11
3.1.5 How to Dry Firewood .................................................................................................................... 11
3.1.6 Judging Firewood Moisture Content ............................................................................................. 11
3.2 Manufactured Logs ................................................................................................................................. 12
4 Operating Your Fireplace ........................................................................................................................... 12
4.1 Your First Fires ....................................................................................................................................... 12
4.2 Lighting Fires .......................................................................................................................................... 12
4.2.1 BEST PRACTICE: The Top Down Fire ........................................................................................ 12
4.2.2 Conventional Fire Starting ............................................................................................................ 13
4.2.3 Two Parallel Logs ......................................................................................................................... 13
4.2.4 Using Fire Starters ........................................................................................................................ 13
4.3 Maintaining Wood Fires .......................................................................................................................... 13
4.3.1 General Advice ............................................................................................................................. 13
4.3.2 Ash Removal ................................................................................................................................ 14
4.3.3 Raking Charcoal ........................................................................................................................... 14
4.3.4 Firing Each New Load Hot ............................................................................................................ 14
4.3.5 Shutting Down the Air Supply ....................................................................................................... 15
4.3.6 Building Different Fires for Different Needs .................................................................................. 16
5 Maintaining Your Wood Heating System .................................................................................................. 19
5.1 Fireplace Maintenance ........................................................................................................................... 19
5.1.1 Plated Finish Maintenance ........................................................................................................... 19
5.1.2 Glass Door Cleaning .................................................................................................................... 19
5.1.3 Door Adjustment ........................................................................................................................... 19
5.1.4 Door Alignment ............................................................................................................................. 20
5.1.5 Replacing the Door Gaskets ......................................................................................................... 21
5.1.6 Replacing the Door Glass ............................................................................................................. 21
5.1.7 Cleaning and Painting the Fireplace............................................................................................. 22
5.2 Chimney and Chimney Liner Maintenance ............................................................................................. 22
5.2.1 Why Chimney Cleaning is Necessary .......................................................................................... 22
5.2.2 How Often Should You Clean the Chimney? ............................................................................... 22
5.2.3 Cleaning the Chimney .................................................................................................................. 23
5.2.4 Fire Baffle Removal Prior to Cleaning the Chimney ..................................................................... 23
5.2.5 Chimney Fire ................................................................................................................................ 24
PART B – INSTALLATION ................................................................................................................................. 24
6 Safety Information ....................................................................................................................................... 24

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6.1 Summary of Installation Cautions and Warnings ................................................................................... 24
6.2 Regulations Covering Fireplace Installation ........................................................................................... 25
6.3 Fireplace Installation ............................................................................................................................... 25
6.3.1 Standoff installation ...................................................................................................................... 25
6.3.2 Transportation Packaging ............................................................................................................. 25
6.3.3 Locating the WFP-100 .................................................................................................................. 25
6.3.4 Clearances to combustible materials............................................................................................ 26
6.3.5 Hearth extension construction options ......................................................................................... 27
6.3.6 Minimum Heart Extension Requirements ..................................................................................... 33
6.3.7 Framing construction .................................................................................................................... 34
6.3.8 Facing ........................................................................................................................................... 37
6.3.9 Installation of a non combustible shelf.......................................................................................... 37
7 Façade and Door Installation ..................................................................................................................... 36
7.1 Façade Package……………………………………………………………………………….………………36
7.2 Install the Doors…………………………………………………………………………………………………37
7.3 Install the Wooden Knobs…………………………………………………………………………………….37
7.4 Aligning the Doors ................................................................................................................................... 37
7.5 Install the Façade……………………………………………………………………………………………..37
8 The Venting System .................................................................................................................................... 38
8.1 General ................................................................................................................................................... 39
8.2 Suitable Chimneys .................................................................................................................................. 39
8.3 Minimum Chimney Height....................................................................................................................... 39
8.4 The Relationship Between the Chimney and the House ........................................................................ 39
8.4.1 Why the chimney should penetrate the highest heated space ..................................................... 40
8.5 Chimney Installation Notes ..................................................................................................................... 40
8.6 Chimney Installation Instructions ............................................................................................................ 42
8.6.1 Examples of Typical Chimney Installation .................................................................................... 42
8.6.2 Exterior Offset Installation ............................................................................................................ 43
8.6.3 Installation Instructions ................................................................................................................. 43
8.6.4 Offset Chimney Installation ........................................................................................................... 44
8.7 Angled Wall Radiation Shield ................................................................................................................. 46
8.8 Chimney Support Installation .................................................................................................................. 46
8.8.1 Universal Roof Support ................................................................................................................ 46
8.8.2 Universal Offset Support .............................................................................................................. 47
8.9 Installation Instructions for Masonry Application .................................................................................... 47
8.9.1 Installation instructions ................................................................................................................. 47
8.10 Supply of Combustion Air .................................................................................................................... 47
APPENDIX 1 - Hot air circulation grille – Modern style (94-99200) ............................................................... 48
APPENDIX 2 - Forced Air Distribution Kit (94-57200) .................................................................................... 49
APPENDIX 3 - Blower Maintenance or Replacement ..................................................................................... 50
APPENDIX 4 - Installing the Fresh Air Intake Kit ............................................................................................ 51
APPENDIX 5 - Refractory Slabs Replacement ................................................................................................ 53
APPENDIX 6 - Installation OF Secondary Air Tubes and Baffle ................................................................... 53
APPENDIX 7 - Air Control Snap Disc Replacement ....................................................................................... 56
APPENDIX 8 – Electrical Wiring ....................................................................................................................... 57
APPENDIX 9 - Parts List .................................................................................................................................... 57
HEARTHSTONE LIMITED LIFETIME WARRANTY .......................................................................................... 59

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PART A - OPERATION AND MAINTENANCE
1. SAFETY INFORMATION
1.1 SUMMARY OF OPERATION AND MAINTENANCE CAUTIONS AND WARNINGS
CAUTION - OPERATION
•
USING A FIREPLACE WITH CRACKED OR BROKEN COMPONENTS, SUCH AS GLASS OR FIREBRICKS OR
BAFFLES MAY PRODUCE AN UNSAFE CONDITION AND MAY DAMAGE THE FIREPLACE.
•
OPERATE ONLY WITH DOOR FULLY CLOSED. IF DOOR IS LEFT PARTLY OPEN, GAS AND FLAME MAY
BE DRAWN OUT OF THE OPENING, CREATING RISKS FROM BOTH FIRE AND SMOKE.
•
OPEN THE AIR CONTROL FULLY BEFORE OPENING THE LOADING DOOR.
•
NEVER USE GASOLINE, LANTERN FUEL (NAPHTHA), FUEL OIL, MOTOR OIL, KEROSENE, CHARCOAL
LIGHTER FLUID, OR SIMILAR LIQUIDS OR AEROSOLS TO START A FIRE IN THIS FIREPLACE. KEEP ALL
SUCH LIQUIDS OR AEROSOLS WELL AWAY FROM THE FIREPLACE WHILE IT IS IN USE.
•
HOT WHILE IN OPERATION, KEEP CHILDREN, CLOTHING AND FURNITURE AWAY. CONTACT MAY
CAUSE SKIN BURNS. GLOVES MAY BE NEEDED FOR FIREPLACE OPERATION.
•
DO NOT STORE FUEL WITHIN HEATER MINIMUM INSTALLATION CLEARANCES.
•
BURN ONLY SEASONED NATURAL FIREWOOD.
•
DO NOT BURN SCRAP OR GARBAGE, TREATED WOOD OR WOOD SUCH AS DRIFTWOOD FROM THE
OCEAN WHICH HAS BEEN EXPOSED TO SALT OR OTHER CHEMICALS. SALT OR CHEMICALS CAN
CORRODE THE FIREBOX AND CHIMNEY. DO NOT BURN LARGE AMOUNTS OF PAPER, CARDBOARD,
TREE BRANCHES OR BUILDING CONSTRUCTION MATERIALS. INTENSE FIRING WITH THESE
MATERIALS MAY OVERHEAT THE FIREPLACE, CAUSING DAMAGE TO THE UNIT, A HOME FIRE OR
EVEN POSSIBLY IGNITING A CHIMNEY FIRE IF THE CHIMNEY IS CREOSOTED.
•
THIS APPLIANCE SHOULD BE MAINTAINED AND OPERATED AT ALL TIMES IN ACCORDANCE WITH
THESE INSTRUCTIONS.
•
DO NOT ELEVATE THE FIRE BY MEANS OF GRATES, ANDIRONS OR OTHER MEANS.
•
DO NOT OBSTRUCT AIR INTLETS. THIS FIREPLACE NEEDS AIR FOR ITS GOOD OPERATION.
•
DO NOT BLOCK THE HOT AIR VENTS TO THE FIREPLACE AS THIS WILL CAUSE THE FIREPLACE TO
OVERHEAT.
•
A SMOKE DETECTOR, A CARBON MONOXIDE DETECTOR AND A FIRE EXTINGUISHER SHOULD BE
INSTALLED IN THE HOUSE. THE LOCATION OF THE FIRE EXTINGUISHER SHOULD BE KNOWN BY ALL
FAMILY MEMBERS.
•
THIS WOOD HEATER NEEDS PERIODIC INSPECTION AND REPAIRS FOR THE PROPER OPERATION. IT IS
AGAINST FEDERAL REGULATIONS TO OPERATE THIS WOOD HEATER IN A MANNER INCONSISTENT
WITH OPERATING INSTRUCTIONS IN THIS GUIDE.
CAUTION - INSTALLATION
•
DO NOT INSTALL THE FIREPLACE OUTDOORS.
•
THE FIREPLACE AND CHIMNEY MUST BE IN AN ENCLOSURE UP TO THE ATTIC.
•
SOME JURISDICTIONS IN THE USA REQUIRE A SUPPLY OF OUTDOOR COMBUSTION AIR FOR THE
FIREPLACE. IN CANADA, AN OUTDOOR AIR SUPPLY IS NOT REQUIRED, IF A CARBON MONOXIDE (CO)
DETECTOR/ALARM IS LOCATED IN THE ROOM IN WHICH THE FIREPLACE IS INSTALLED. THE CO
DETECTOR WILL PROVIDE WARNING IF FOR ANY REASON THE WOOD FIREPLACE FAILS TO FUNCTION
CORRECTLY. IF YOU ARE REQUIRED TO INSTALL AN OUTDOOR AIR SUPPLY, WE RECOMMEND THAT
YOU ALSO INSTALL A CO DETECTOR/ALARM TO PROVIDE WARNING IF SMOKE SPILLAGE FROM THE
FIREPLACE OCCURS.

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WFP-100 Model 8420
•
KEEP COMBUSTIBLE MATERIALS AT LEAST 48 INCHES AWAY FROM THE FRONT OF THE FIREPLACE
OPENING.
•
DO NOT USE A FIREPLACE INSERT AND OTHER PRODUCTS NOT SPECIFIED FOR USE WITH THIS
FIREPLACE.
•
DO NOT INSTALL IN A MOBILE HOME (CANADA) OR MANUFACTURED HOME (USA).
WARNING
•
DO NOT USE MATERIALS OTHER THAN THOSE LISTED IN THE REPLACEMENT PARTS SECTION DURING
INSTALLATION AS THEY MAY BE SAFETY HAZARDS AND A FIRE COULD RESULT.
•
THIS FIREPLACE HAS NOT BEEN TESTED WITH AN UNVENTED OR VENTED GAS LOG SET. TO REDUCE
RISK OF FIRE OR INJURY, DO NOT INSTALL AN UNVENTED GAS LOG SET INTO THIS FIREPLACE.
PLEASE NOTE THAT THE PICTURES SHOWN IN THIS MANUAL ARE GENERIC AND MAY NOT
MATCH EXACTLY THE LOOK OF YOUR FIREPLACE.

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WFP-100 Model 8420
2 GENERAL INFORMATION
2.1 APPLIANCE PERFORMANCE
(1)
Fuel type Dry cordwood
Recommended heating area
[*]
1,000 to 2,800 ft
2
(93 to 260 m
2
)
Firebox volume 4.28 ft
3
(0.113 m
3
)
Maximum burn time
[*]
10 h
Overall heat output rate (min. to max.)
(2)(3)
16,610 BTU/h to 43,021 BTU/h (4.9 kW to 12.6 kW)
Average overall efficiency
(3)
- Dry cordwood 63.9% (HHV
(4)
) 68.4% (LHV
(5)
)
Optimum efficiency
(2)(6)
69.7%
Average particulate emissions rate
(7)
1.6 g/h (EPA)
Average CO
(8)
157.4 g/h
[*]
Recommended heating area and maximum burn time may vary subject to location in home, chimney draft, heat loss factors,
climate, fuel type and other variables. The recommended heated area for a given appliance is defined by the manufacturer as its
capacity to maintain a minimum acceptable temperature in the designated area in case of a power failure.
(1)
Values are as measured per test method, except for the recommended heating area, firebox volume, maximum burn time and
maximum heat output.
(2)
The maximum heat output (dry cordwood) is based on a loading density varying between 15 lb/ft
3
and 20 lb/ft
3
. Other
performances are based on a fuel load prescribed by the standard. The specified loading density varies between 7 lb/ft
3
and
12 lb/ft
3
. The moisture content is between 19% and 25%.
(3)
As measured per CSA B415.1-10 stack loss method.
(4)
Higher Heating Value of the fuel.
(5)
Lower Heating Value of the fuel.
(6)
Optimum overall efficiency at a specific burn rate (LHV).
(7)
This appliance is officially tested and certified by an independent agency.
(8)
Carbon monoxide.
2.1 GENERAL FEATURES
Maximum log length
1
25 in (635 mm) east-west*
Flue outlet diameter 8 in (203 mm)
Chimney diameter 8 in (203 mm)
Type of chimney CAN/ULC S629, UL 103 HT (2100 °F)
Baffle material C-Cast
Approved for alcove installation Not approved
Approved for mobile home installation
‡
Not approved
Shipping weight (without option) 545 lb (247 kg)
Appliance weight
(Including refractory slabs and faceplate)
665 lb (302 kg)
Type of door Double, glass with cast iron frame
Type of glass Ceramic glass
Blower Included (up to 176 CFM)
Particulate emission standard EPA / ASTM WK47329
USA standard (safety) UL 127
Canadian standard (safety) ULC-S610
**
East-west: through the door you see the longitudinal sides of the logs; north-south: through the door you see the tips of the
logs.
‡
Mobile home (Canada) or manufactured home (USA): The US department of Housing and Urban Development describes
“manufactured homes” better known as “mobile homes” as followed; buildings built on fixed wheels and those transported on
temporary wheels/axles and set on a permanent foundation. In Canada, a mobile home is a dwelling for which the
manufacture and assembly of each component is completed or substantially completed prior to being moved to a site for
installation on a foundation and connection to service facilities and which conforms to the CAN/CSA-Z240 MH standard.
1
The recommended log length is 16 inches, placed in the north-south orientation. For more details see section 3 - Fuel.

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WFP-100 Model 8420
2.2 DIMENSIONS
2.3.1 ZONE HEATING AND HOW TO MAKE IT WORK FOR YOU
Your new WFP-100 wood fireplace is a space heater, which means it is intended to heat the area it is
installed in as well as spaces that connect to that area, although to a lower temperature. This is called
zone heating and it is an increasingly popular way to heat homes or spaces within homes.
Zone heating can be used to supplement another heating system by heating a particular space within a
home, such as a basement family room or an addition that lacks another heat source.
Houses of moderate size and relatively new construction can be heated with a properly sized and located
wood fireplace. Whole house zone heating works best when the fireplace is located in the part of the
house where the family spends most of its time. This is normally the main living area where the kitchen,

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WFP-100 Model 8420
dining and living rooms are located. By locating the fireplace in this area, you will get the maximum benefit
of the heat it produces and will achieve the highest possible heating efficiency and comfort. The space
where you spend most of your time will be warmest, while bedrooms and basement (if there is one) will
stay cooler. In this way, you will burn less wood than with other forms of heating.
Although the fireplace may be able to heat the main living areas of your house to an adequate
temperature, we strongly recommend that you also have a conventional oil, gas or electric heating system
to provide backup heating.
Your success with zone heating will depend on several factors, including the correct sizing and location of
the fireplace, the size, layout and age of your home and your climate zone. Three-season vacation homes
can usually be heated with smaller fireplaces than houses that are heated all winter.
2.3 THE BENEFITS OF LOW EMISSIONS AND HIGH EFFICIENCY
The low smoke emissions produced by the special features inside the WFP-100 firebox mean that your
household will release up to 90 percent less smoke into the outside environment than if you used an older
conventional stove. But there is more to the emission control technologies than protecting the environment.
The smoke released from wood when it is heated contains about half of the energy content of the fuel. By
burning the wood completely, your fireplace releases all the heat energy from the wood instead of wasting it
as smoke up the chimney. Also, the features inside the firebox allow you to reduce the air supply to control
heat output, while maintaining clean and efficient flaming combustion, which boosts the efficient delivery of
heat to your home.
The emission control and advanced combustion features of your fireplace can only work properly if your fuel
is in the correct moisture content range of 15% to 20%. See Section 3: Fuel of this manual for suggestions
on preparing fuel wood and judging its moisture.
2.4 THE HEARTHSTONE COMMITMENT TO YOU AND THE ENVIRONMENT
The HEARTHSTONE team is committed to protecting the environment, so we do everything we can to use
only materials in our products that will have no lasting negative impact on the environment.
2.4.1 WHAT IS YOUR NEW FIREPLACE MADE OF?
The body of your fireplace, which is most of its weight, is carbon steel. Should it ever become necessary
many years in the future, almost the entire fireplace can be recycled into new products, thus eliminating
the need to mine new materials.
The paint coating on your fireplace is very thin. Its VOC content (Volatile Organic Compounds) is very low.
VOCs can be responsible for smog, so all the paint used during the manufacturing process meets the
latest air quality requirements regarding VOC reduction or elimination.
The air tubes are stainless steel, which can also be recycled.
The C-Cast baffle is made of an aluminosilicate fibre material that is compressed with a binder to form a
rigid board. C-Cast can withstand temperatures above 2,000 °F. It is not considered hazardous waste.
Disposal at a landfill is recommended.
Moulded refractory bricks are mainly composed of silicon dioxide, also known as silica, a product
processed from a mined mineral. It is most commonly found in nature in the form of sand and clay.
Disposal at a landfill is recommended. The steel mesh contained in some refractory bricks can be
recycled.
The door and glass gaskets are fibreglass which is spun from melted sand. Black gaskets have been
dipped into a solvent-free solution. Disposal at a landfill is recommended.

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WFP-100 Model 8420
The door glass is a 5 mm thick ceramic material that contains no toxic chemicals. It is made of natural raw
materials such as sand and quartz that are combined in such a way to form a high temperature glass.
Ceramic glass cannot be recycled in the same way as normal glass, so it should not be disposed of with
your regular household products. Disposal at a landfill is recommended.
3 FUEL
CAUTION
 DO NOT BURN SCRAP OR GARBAGE, TREATED WOOD OR WOOD SUCH AS DRIFTWOOD FROM
THE OCEAN WHICH HAS BEEN EXPOSED TO SALT OR OTHER CHEMICALS. SALT OR
CHEMICALS CAN CORRODE THE FIREBOX AND CHIMNEY. DO NOT BURN LARGE AMOUNTS OF
PAPER, CARDBOARD, TREE BRANCHES OR BUILDING CONSTRUCTION MATERIALS. INTENSE
FIRING WITH THESE MATERIALS MAY OVERHEAT THE FIREPLACE, CAUSING DAMAGE TO THE
UNIT, A HOME FIRE OR EVEN POSSIBLY IGNITING A CHIMNEY FIRE IF THE CHIMNEY IS
CREOSOTED.

DO NOT OVER FIRE THIS HEATER OVER FIRING CAN RESULT IN A SAFETY HAZARD AND CAN
PERMANENTLY DAMAGE THE FIREPLACE AND CHIMNEY.
3.1 HOW TO PREPARE OR BUY GOOD FIREWOOD
3.1.1 WHAT IS GOOD FIREWOOD?
Good firewood has been cut to the correct length for the fireplace, split to a range of sizes and stacked in
the open until its moisture content is reduced to 15% to 20%.
3.1.2 TREE SPECIES
The tree species the firewood is produced from is less important than its moisture content. The main
difference in firewood from various tree species is the density of the wood. Hardwoods are denser than
softwoods. People who live in the coldest regions of North America usually have only spruce, birch and
poplar, other low-density species to burn and yet they can heat their homes successfully.
Homeowners with access to both hardwood and softwood fuel sometimes use both types for different
purposes. For example, softer woods make good fuel for relatively mild weather in spring and fall because
they light quickly and produce less heat. Softwoods are not as dense as hardwoods so a given volume of
wood contains less energy. Using softwoods avoids overheating the house, which can be a common
problem with wood heating in moderate weather. Harder woods are best for colder winter weather when
more heat and longer burn cycles are desirable.
Note that hardwood trees like oak, maple, ash and beech are slower growing and longer lived than softer
woods like poplar and birch. That makes hardwood trees more valuable. The advice that only hardwoods
are good to burn is outdated. Old, leaky cast iron stoves wouldn’t hold a fire overnight unless they were fed
large pieces of hardwood. That is no longer true. You can successfully heat your home by using the less
desirable tree species and give the forest a break at the same time.
3.1.3 LOG LENGTH
Logs should be cut at least 1" (25 mm) shorter than the firebox so they fit in
easily. Pieces that are even slightly too long make loading the fireplace very
difficult. The log length recommended for your fireplace is 16" (406mm)
The pieces should be a consistent length, with a maximum of 1" (25 mm)
variation from piece to piece.

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WFP-100 Model 8420
3.1.4 PIECE SIZE
Firewood dries more quickly when it is split. Large unsplit rounds can take years to dry enough to burn.
Even when dried, unsplit logs are difficult to ignite because they don’t have the sharp edges where the
flames first catch. Logs as small as 3” (75 mm) should be split to encourage drying.
Wood should be split to a range of
sizes, from about 3" to 6" (75 mm to
150 mm) in cross section. Having a
range of sizes makes starting and
rekindling fires much easier. Often,
the firewood purchased from
commercial suppliers is not split
finely enough for convenient
stoking. It is sometimes advisable to
resplit the wood before stacking to
dry.
3.1.5 HOW TO DRY FIREWOOD
Firewood that is not dry enough to burn is the cause of
most complaints about wood fireplaces. Continually
burning green or unseasoned wood produces more
creosote and involves lack of heat and dirty glass door.
See Section 5: Maintaining your wood heating
system for concerns about creosote.
Here are some things to consider in estimating drying
time:
•
Firewood takes a long time to dry.
•
Small pieces dry more quickly than large pieces.
•
Split pieces dry more quickly than unsplit rounds.
•
Softwoods take less time to dry than hardwoods.
•
Softwoods like pine, spruce, and poplar/aspen
can be dry enough to burn after being stacked in the
open for only the summer months.
•
Hardwoods like oak, maple and ash can take one,
or even two years to dry fully, especially if the
pieces are big.
•
Firewood that is ready to burn has a moisture
content between15% and 20% by weight and will
allow your fireplace to produce its highest possible
efficiency.
•
Firewood bought from a dealer is rarely dry
enough to burn, so it is advisable to buy the wood in
spring and dry it yourself.
•
Drying happens faster in dry weather than in
damp, maritime climates.
•
Drying happens faster in warm summer weather
than in winter weather.
•
Firewood dries more quickly when stacked in the
open where it is exposed to sun and wind; it takes
much longer to dry when stacked in a wood shed.
3.1.6 Judging Firewood Moisture Content
You can find out if some firewood is dry enough to burn by using these guidelines:
•
cracks form at the ends of logs as they dry
•
as it dries in the sun, the wood turns from white or cream
colored to grey or yellow
•
bang two pieces of wood together; seasoned wood
sounds hollow and wet wood sounds dull
•
dry wood is much lighter in weight than wet wood
•
split a piece, and if the fresh face feels warm and dry it
is dry enough to burn; if it feels damp, it is too wet
•
burn a piece; wet wood hisses and sizzles in the fire
and dry wood does not
You could buy a wood moisture meter to test your firewood.

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………………………………………………….CAUTION………………………………………………………….
 DO NOT BURN ANY MANUFACTURED LOGS CONTAINING CHEMICAL ADDITIVES. YOU MAY
OVERHEAT YOUR FIREPLACE, THEREFORE CAUSING A FIRE HAZARD AND VOIDING YOUR
WARRANTY.
 DO NOT POKE OR STIR THE LOGS WHILE THEY ARE BURNING.
 USE ONLY FIRELOGS THAT HAVE BEEN TESTED FOR USE IN FIREPLACES (SEE ULC/ORD-
C127, COMPOSITE FIRELOGS) AND PRIOR TO USE, REFER TO FIRELOG WARNINGS AND
CAUTIONS MARKINGS ON PACKAGING.
3.2 MANUFACTURED LOGS
Manufactured logs made of 100% wood residues can be burn in your
fireplace. However, they must be used carefully. Therefore, you cannot
place a large quantity of such logs into your fireplace. Manufactured
logs typically release a much larger heat output over a short period of
time. Start with one log and see how the fireplace reacts. You can
increase the number of logs burned at a time to a maximum of three.
Burning more than three manufactured logs at one time can overheat
and damage your stove.
4 OPERATING YOUR FIREPLACE
4.1 YOUR FIRST FIRES
Two things will happen as you burn your first few fires: the paint cures and the internal components of the
fireplace are conditioned.
As the paint cures, some of the chemicals vaporize. The vapors are not poisonous, but they do smell bad.
Fresh paint fumes can also cause false alarms in smoke detectors. So, when you first light your fireplace, be
prepared by opening doors and/or windows to ventilate the house. As you burn hotter and hotter fires, more
of the painted surfaces reach the curing temperature of the paint. The smell of curing paint does not
disappear until you have burned one or two very hot fires.
Burn one or two small fires to begin the curing and conditioning process. Then build bigger and hotter fires
until there is no longer any paint smell from the fireplace. Once the paint smell disappears, your fireplace is
ready for serious heating.
4.2 LIGHTING FIRES
Each person who heats with wood develops their own favorite way to light fires. Whatever method you
choose, your goal should be to get a hot fire burning quickly. A fire that starts fast produces less smoke and
deposits less creosote in the chimney. Here are three popular and effective ways to start wood fires.
4.2.1 BEST PRACTICE: THE TOP DOWN FIRE
The top down fire starting method solves two problems with the conventional method: first, it does not
collapse and smother itself as it burns; and second, it’s cleaner. The top down method only works properly
if the wood is well-seasoned.
Start by crisscrossing around 10 finely split and dry kindling (0.5 to 1 in) leaving air space between the
pieces. Then put at least 5 news paper sheets to the top of the pieces. The best way to have your ignition
clean and environmentally friendly is to roll the news papers to make a long cylinder, then to make 2 knots
with it. The goal is to have the news papers as compact as possible to make it burn slowly. After the
ignition of the news paper, let the door open of 1 inch for 5-10 minutes.
The air control should be open.
When you have a small coal bed, it’s the time to crisscross three or four
medium-sized split pieces (2-3 in) of dry firewood in the firebox. You
can close the door as soon as you loaded the pieces. Let burn until you
have a good coal bed. You are now ready for the main load.

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4.2.2 CONVENTIONAL FIRE STARTING
DO NOT LEAVE THE FIREPLACE UNATTENDED WHEN THE DOOR IS SLIGHTLY
OPENED. ALWAYS CLOSE AND LATCH THE DOOR AFTER THE FIRE IGNITES.
After the kindling fire has mostly burned, you can add standard firewood pieces until you have a fire of the
right size for the conditions.
CAUTION: PLACE THE WOOD LOGS FAR ENOUGH FROM THE GLASS TO ALLOW
PROPER PRIMARY AIR FLOW
4.2.3 TWO PARALLEL LOGS
Place two split logs in the firebox. Place a few sheets of twisted newspaper between the logs. Now place
some fine kindling across the two logs and some larger kindling across those, log cabin style. Light the
newspaper.
4.2.4 USING FIRE STARTERS
Many people like to use commercial fire starters instead of newspaper. Some of these starters are made of
sawdust and wax and others are specialized flammable solid chemicals. Follow the package directions for
use.
Gel starter may be used but only if there are no hot embers present. Use only in a cold firebox to start a
fire.
DO NOT USE FLAMMABLE LIQUIDS SUCH AS GASOLINE, NAPHTHA, FUEL OIL, MOTOR
OIL, OR AEROSOLS TO START OR REKINDLE THE FIRE.
4.3 MAINTAINING WOOD FIRES
4.3.1 GENERAL ADVICE
Wood heating with a space heater is very different than other forms of heating. There will be variations in
the temperature in different parts of the house and there will be variations in temperature throughout the
day and night. This is normal, and for experienced wood burners these are advantages of zone heating
with wood.
Do not expect steady heat output from your fireplace. It is normal for its surface temperature to rise after a
new load of wood is ignited and for its temperature to gradually decline as the fire progresses. This rising
and falling of temperature can be matched to your household routines.
For example, the area temperature can be cooler when you are active, such as when doing housework or
cooking, and it can be warmer when you are inactive, such as when reading or watching television.
IMPORTANT: Wood burns best in cycles. A cycle starts when a new load of wood is ignited by hot coals
and ends when that load has been consumed down to a bed of charcoal about the same size as it was
when the wood was loaded. Do not attempt to produce a steady heat output by placing a single log on the
fire at regular intervals. Always place at least 5 to 8 pieces on the fire at a time in the North-South
orientation so that the heat radiated from one piece helps to ignite the pieces next to it. Each load of wood
The conventional way to build a wood fire is to bunch up 5 to
10 sheets of plain newspaper and place them in the firebox.
Next, place 10 or so pieces of fine kindling on the
newspaper. This kindling should be very thin; less than 1”
(25 mm). Next, place some larger kindling pieces on the fine
kindling. Open the air control fully and light the newspaper.
If you have a tall, straight venting system you should be able
to close the door immediately and the fire will ignite. Once
the fire has ignited, close the door and leave the air control
fully open.
A conventional kindling fire with
Paper under finely split wood.

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should provide several hours of heating. The size of each load can be matched to the amount of heat
needed.
When you burn in cycles, you rarely need to open the fireplace’s loading door while the wood is flaming.
This is an advantage because there is more chance that smoke will leak from the fireplace when the door
is opened as a full fire is burning.
IF YOU MUST OPEN THE DOOR WHILE THE FUEL IS FLAMING, OPEN THE AIR CONTROL FULLY
FOR A FEW MINUTES, THEN UNLATCH AND OPEN THE DOOR SLOWLY.
4.3.2 ASH REMOVAL
Ash should be removed from the firebox every two or three days of full time heating. Do not let the ash
build up in the firebox because it will interfere with proper fire management.
The best time to remove ash is after an overnight fire when the fireplace is relatively cool, but there is still
some chimney draft to draw the ash dust into the fireplace and prevent it from coming into the room.
After ashes have been removed from the fireplace and placed in a tightly covered metal container, they
should be taken outside immediately. The closed container of ashes should be placed on a non-
combustible floor or on the ground well away from all combustible materials pending final disposal. Ashes
normally contain some live charcoal that can stay hot for several days. If the ashes are disposed of by
burial in soil or otherwise locally dispersed, they should be retained in the closed container until all cinders
have thoroughly cooled. Other waste should not be placed in this container.
NEVER STORE ASHES INDOORS OR IN A NON-METALIC CONTAINER OR ON A WOODEN DECK.
4.3.3 RAKING CHARCOAL
Rekindle the fire when you notice that the room temperature has fallen. You will find most of the remaining
charcoal at the back of the firebox, furthest from the door. Rake these coals towards the door before
loading. There are two reasons for this raking of the coals. First, it concentrates them near where most of
the combustion air enters the firebox and where they can ignite the new load quickly, and second, the
charcoal will not be smothered by the new load of wood. If you were to simply spread the charcoal out, the
new load will smoulder for a long time before igniting.
Remove ash first, and then rake charcoal towards the front of the firebox before loading so that it will ignite
the new load.
4.3.4 FIRING EACH NEW LOAD HOT
Place the new load of wood on and behind the charcoal, and not too close to the glass. Close the door and
open the air control fully. Leave the air control fully open until the firebox is full of flames, the wood has
charred to black and its edges are glowing red. Firing each load of wood hot accomplishes a few things:
•
Drives the surface moisture from the wood,
•
Creates a layer of char on the wood, which slows down its release of smoke,
•
Heats the firebox components so they reflect heat back to the fire, and
•
Heats the chimney so it can produce strong, steady draft for the rest of the cycle.
DO NOT LEAVE THE FIREPLACE UNATTENDED WHILE A NEW LOAD IS BEING FIRED
HOT. DO NOT OVERFIRE.
When you burn a new load of wood hot, the result will be a surge of heat from the fireplace. This heat
surge is welcome when the room temperature is a little lower than desirable, but not welcome if the space
is already warm. Therefore, allow each load of wood to burn down so that the space begins to cool off a

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little before loading. Letting the space cool before loading is one of the secrets to clean burning and
effective zone heating.
4.3.5 SHUTTING DOWN THE AIR SUPPLY
The fireplace can operate at three different settings: Maximum combustion rate, medium combustion rate
and finally low combustion rate. At the low combustion rate setting, the fireplace is operated with an air
control system that regulates the combustion.
The maximum combustion rate setting is usually for cold startup and when maximum heat is desired
(Position A). At the maximum combustion rate setting, the air control system is not operating.
NOTE
THE AIR CONTROL SYSTEM IS ACTIVATED ONLY WHEN THE AIR INTAKE IS COMPLETLY CLOSED
(POSITION B) AND WHEN THE FIREPLACE IS HOT ENOUGH.
When you close the air intake, you gradually reduce the combustion. Visually you will be able to notice a
considerable reduction of combustion. Under these conditions, you will be at the medium combustion rate.
Using the secondary air intake lever you can adjust your combustion system to eventually reach the
minimum combustion rate.
If the flames diminish to the point of disappearing when you reduce the air supply, your wood can be too
humid. If you have seasoned wood and use the air intake control properly, the flames should decrease, but
remain strong and stable, even when operating at low combustion rate.
Position A: In this position, air supply is fully
open. You should be using this position for :
 Cold start;
 Maximum burn rate;
Position B: Air control intake is closed. The air
control system is activated.
Position B1: Low combustion rate.
Position B2 : Medium combustion rate
Example of operating sequence :
A : Cold start or Maximum burn rate.
B : Mid-High until the factory setting temperature
is reached.
B-2 or B-1 : Mid-Low or Low once the factory
setting is reached.

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In the B position, it is also possible to close the air supply manually if a power failure occurs by pushing the
small lever to the left.
4.3.6 BUILDING DIFFERENT FIRES FOR DIFFERENT NEEDS
Using the air control is not the only way to match the fireplace’s heat output to the heat demand. Your
house will need far less heat in October than in January to be kept at a comfortable temperature. If you fill
the firebox full in fall weather, you will either overheat the space or turn the fireplace down so much that
the fire will be smoky and inefficient.
4.3.7 EPA Certification Loading
The charging methods presented below are those that were used during emissions certification.
For EPA Certification testing, wood logs were 16 ± 1 inches long and the specie used was beech.

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High burn rate
Open the air control completely (see Section 4.3.5, position A). Place two medium kindling pieces (2"x2")
of wood on the brick of the firebox in a north-south orientation. Then, put two other medium kindling pieces
(2"x2") of wood above the first one with an east-west orientation. Then, put two more rows of smaller wood
(1"x1") on top of the first two rows. The first row, put four pieces with a north-south orientation and the
second one, put two more pieces with the east-west direction. Leave a little space between each piece. Tie
knot with four sheets of paper and place them on top of the kindling wood. Light up the paper and let the
door ajar at 90° until all the wood is on fire. Close the door.
When there is no more fire in the front of the firebox and there are only faint flames on the wood in the
back of the firebox, break ashes, level the coal bed and put four start-up fuel pieces (3"x2"). Put the first
two bigger pieces with a north-south orientation and a second row of two pieces with an east-west
orientation. Spaced them of around 6 inches. Let the door ajar until all the wood is on fire. Close the door.
Once again, when there is no more fire in the front of the firebox and there are only faint flames on the
wood in the back of the firebox, break ashes and level the coal bed. Then place two rows of three pieces
of wood (4"x4") in the middle of the fire chamber in a North-South orientation. They should touch the rear
bricks and be 1 ½ inch apart from each other. Close the door immediately and leave the primary air control
completely open.
Medium and low burn rate
On a 2" coal bed that is still slightly red, place two rows of three pieces of wood (5"x4") on the left side of
the fire chamber with a north-south orientation then place one more piece of wood (5"x4") on the right side
of the two rows. There should be all at least 1 inch of air between each column. Let the door ajar for 5
minutes and then close the door with the primary air control fully open. Wait for approximately 2 more
minutes before closing manually the primary air control completely. For the medium burn rate, push the
auxiliary air control toward the fireplace (see Section 4.3.5, position B-2). For the low burn rate, pull the
auxiliary air control out (see Section 4.3.5, position B-1).
4.3.8 MAXIMUM BURN CYCLE TIMES
The burn cycle time is the period between loading wood on a coal bed and the consumption of that wood
back to a coal bed of the same size. The flaming phase of the fire lasts for roughly the first half of the burn
cycle and the second half is the coal bed phase during which there is little or no flame. The length of burn
you can expect from your fireplace, including both the flaming and coal bed phases, will be affected by a
number of things, such as:
•
Firebox size,
•
The amount of wood loaded,
•
The species of wood you burn,
•
The wood moisture content
•
The size of the space to be heated,
•
The climate zone you live in, and
•
The time of year.
This table provides a very general indication
of the maximum burn cycle times you are
likely to experience, based on firebox
volume.
Long burn times are not necessarily an
indication of efficient fireplace operation.
When you are home during the day and
able to tend the fire, it is preferable to build
a smaller fire that might provide three or four hours of heating than to fully load the firebox for a much
longer burn. Shorter burn cycles make it easier to match the heat output of the fireplace to the heat
demand of the space.
4.3.9 HOW TO PLACE THE LOGS
In fireboxes that are roughly square, wood can be loaded so that looking through the glass door you see
the ends of the logs (north-south) or the sides of the logs (east-west). This fireplace is designed to burn
efficiently in the north-south orientation.
FIREBOX VOLUME
MAXIMUM BURN
TIME
<1.5 cubic feet
3 to 5 hours
1.5 c.f. to 2.0 c.f.
5 to 6 hours
2.0 c.f. to 2.5 c.f.
6 to 8 hours
2.5 c.f. to 3.0 c.f. 8 to 9 hours
>3.0 c.f.
9 to 10 hours

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East-west loads that are built compactly break down slowly when heated, but the amount of wood you can
load is limited because if you put in too many pieces, one may fall against the glass. East-west loads are
excellent for long, low output fires for relatively mild weather.
North-south loads break down more quickly, but much more wood can be loaded at a time. This makes
north-south loading good for high output, long lasting fires for cold weather.

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5 MAINTAINING YOUR WOOD HEATING SYSTEM
5.1 FIREPLACE MAINTENANCE
Your new fireplace will give many years of reliable service if you use and maintain it correctly. Some of the
internal components of the firebox, such as refractory slabs, baffles and air tubes, will wear over time under
intense heat. You should always replace defective parts with original parts (see Appendix 9: Exploded
Diagram and Parts List).
Firing each load hot to begin a cycle as described above will not cause premature deterioration of the
fireplace. However, letting the fireplace run with the air control fully open for the entire burn cycles can cause
damage over time. The hotter you run the fireplace throughout burn cycles, the more quickly its components
will deteriorate. For that reason, never leave the fireplace unattended while a new load is being fired
hot.
5.1.1 PLATED FINISH MAINTENANCE
If your appliance has a plated finish, use a metal polish and a soft cloth to clean it. Do not use abrasives
such as steel wool, steel pads or an abrasive cleaner for they may scratch the finish.
5.1.2 GLASS DOOR CLEANING
Under normal conditions, your door glass should stay relatively clear. If your firewood is dry enough and
you follow the operating instructions in this manual, a whitish, dusty deposit will form on the inside of the
glass after a week or so of use. This is normal and can be easily removed when the fireplace is cool by
wiping with a damp cloth or paper towel and then drying. Never try to clean the glass when the fireplace
is hot.
In spring and fall when the fireplace is run at lower temperatures, you may see some light brown stains
forming, especially at the lower corners of the glass. This indicates that the fire has been smoky and some
of the smoke has condensed on the glass. When the weather is mild, you may find that letting the fire go
out is better than trying to maintain a continuous fire. Use the technique described above for building a fire
to take the chill off the house.
If you do get brown stains on the glass you can remove them with special cleaners for wood heater glass
doors. Do not use abrasives to clean your fireplace’s door glass.
The deposits that form on the glass are the best indication of the quality of your fuel and how well you are
doing in operating the fireplace. Your goal should be clear glass with no brown stains. If you continue to
see brown stains on the glass, something about your fuel and operating procedure needs to be changed.
Stains on the glass indicate incomplete combustion of the wood, which also means more smoke emissions
and faster formation of creosote in the chimney.
If you see brown streaks coming from the edge of the glass, it is time to replace the gasket around the
glass. Visit your fireplace retailer to get the self-adhesive glass gasket and follow the instructions below for
installation.
Do not abuse the glass door by striking or slamming shut. Do not use the fireplace if the glass is
broken.
5.1.3 DOOR ADJUSTMENT
In order for your fireplace to burn at its best efficiency, the door must provide a perfect seal with the
firebox. Therefore, the gasket should be inspected periodically to check for a good seal. The gasket seal
may be improved with a simple latch mechanism adjustment. The right hand door has the operational latch
mechanism installed.

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This mechanism consists of a door
latch (with roller), small metal
spacer rings, a washer, latch spring,
the exterior handle and a handle set
screw. The distance maintained
between the latch roller and the
door itself dictates the latching
pressure, and therefore the overall
door seal. This distance is adjusted
by adding or removing the small
metal spacer rings from the latch
shaft between the latch head and
the back of the door itself. To adjust
the count of these spacer rings on
the latch shaft:
1. Loosen the handle set screw using a 5/32” allen wrench. It may be necessary to rotate the handle
to access the screw head.
2. Unscrew the exterior door handle from the door latch shaft by turning it counter clockwise until it can
be removed.
3. Remove the latch spring and washer.
4. Slide the latch shaft through the door.
5. Remove spacer rings from the latch shaft to tighten the door seal, add spacers to the latch shaft to
loosen.
6. Note the flat spot on the latch shaft. The set screw in the handle docks on this flat spot to prevent
handle rotation on the shaft. Reinstall the latch shaft, washer and spring.
7. Reinstall the handle on the latch shaft by threading it on clockwise and tighten until the handle crank
body is 1/8” away from the door face.
8. Firmly snug set screw.
5.1.4 DOOR ALIGNMENT
To align, open the fireplace’s door and loosen the pressures screws located on the lower and upper hinges
of the door using a 3/32” Allen key to free the adjustable hinge rods.
Using a flat screwdriver, turn the adjustable hinge rods in the direction shown to adjust the doors.
Tighten all door hinge pressure screws when they are at the desired positions.