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HearthStone Quality Home Heating Products, Inc. ®                                                                                                                                                                       Morgan Model 8470            
15
The quality of your firewood affects heat output, duration 
of burn and performance of your Fireplace Insert.  
Softwoods generally burn hotter and faster, while 
hardwoods burn longer and produce more coals.  Density 
and moisture content are two critical factors to consider 
when purchasing wood for your Fireplace Insert.  
 
The following is a list of wood species and their relative 
BTU (British Thermal Unit) content.  The higher the BTU 
the longer the burn.  Firewood with higher BTUs is 
generally considered ideal for a wood stove. 
 
 
HIGH: Apple, Black Birch, Hickory, Locust, White Oak, 
Black Beech, Mesquite 
MEDIUM HIGH: White Ash, Beech, Yellow Birch, 
Sugar Maple, Red Oak 
 
MEDIUM LOW: Black Ash, White Birch, Grey Birch, 
Elm, Norway Pine, Pitch Pine, Black Cherry, Soft Maple, 
Tamarack 
 
LOW: White Pine, White Cedar, Balsam Fir, Spruce, 
Aspen, Basswood, Butternut, Hemlock 
 
Moisture content also plays a key role in the performance 
of your stove.  Wood freshly cut from a living tree (green 
wood) contains a great deal of moisture.  As you might 
expect, green wood has difficulty burning and should be 
seasoned before using it in your wood stove.  To properly 
season green wood, it should be split, stacked and allowed 
to air dry for a period of one year.  
 
Stack the firewood on skids or blocks to keep it off the 
ground, cover only the top of the stack.  Plastic or tarps 
that cover the sides of the woodpile trap moisture and 
prevent the wood from drying.  As for stacking, an old 
Vermonter said, "The spaces between the logs should be 
large enough for a mouse to get through, but not for the 
cat that's chasing it." 
 
Firewood should not be stored within the Fireplace 
Insert's specified clearances to combustible materials. 
 
 
B
UILDING 
A F
IRE
 
Once you understand the controls of your wood Fireplace 
Insert and have chosen the appropriate firewood, you are 
ready to start a fire. 
 
 
B
REAKING 
I
Y
OUR 
W
OOD 
F
IREPLACE 
I
NSERT
 
 
 
It is imperative that your Fireplace Insert be "broken in" 
slowly.  Cast iron must be "seasoned"; over-firing a new 
Fireplace Insert may cause castings to crack or may 
damage other Fireplace Insert parts.  Moisture in the 
soapstone must be driven out slowly to minimize the 
“shock” to the stone of its first exposure to high firebox 
temperatures. In addition, the asbestos-free furnace 
cement must be cured slowly to insure adequate sealing 
and bonding. 
 
When you light your first fires, the wood Fireplace Insert 
will emit some smoke and fumes.  This is normal “off-
gassing” of the paints and oils used when manufacturing 
the wood Fireplace Insert.  If you find it necessary, open a 
few windows to vent your room.  The smoke and fumes 
will usually subside after 10 to 20 minutes of operation.  
The odor and smoke will end once the Fireplace Insert is 
“cured”.   
 
The first fires may produce other odors from impurities 
that exist in the area immediately surrounding the 
Fireplace Insert.  Some of these impurities can be 
cleaning solvents, paint solvents, cigarettes, smoke, pet 
hair, dust, adhesives, a new carpet, and new textiles.  
These odors will dissipate over time.  You can alleviate 
these odors by opening a few windows or otherwise 
creating additional ventilation around your Fireplace 
Insert.  If any odor persists, contact your dealer or an 
authorized service technician. 
 
If you adhere to the following break-in procedure, as well 
as all other operating procedures in this manual, the cast 
iron and soapstone components of your Fireplace Insert 
will give you many years of trouble-free use. With use, 
the color of the soapstone may change and small fractures 
may appear on the surface of the stone. These changes 
will only add character and distinction to your Fireplace 
Insert. 
 
Avoid the following conditions that can cause the 
soapstone or cast iron pieces to break: 
 
•  Do not throw wood into the Fireplace Insert. 
•  Do not use the door as leverage to force wood into 
the Fireplace Insert. 
•  Do not load wood that is encrusted with ice into a 
burning stove as the thermal shock can cause 
damage. 
•  Do not use a manufactured grate. Burn the fire 
directly on the soapstone that lines the bottom of the 
firebox. 
 
The bottom layer of soapstone in the firebox is intended 
to prevent thermal stress and should remain in place in the 
fire box at all times. 
 
B
UILDING 
A B
REAK 
I
F
IRE
 
 
1)  Open the front door and place five or six 
double sheets of tightly twisted newspaper