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8
Operating the Heater
8.1 Before You Begin
Do not use any flammable liquid (gasoline, lighter
fluid, diesel, etc) to help start or maintain a fire in the
heater as this can result in serious bodily injury and
can cause damage to the heater and property.
Do not burn anything other than properly prepared
wood in the heater. Do not burn garbage, trash,
unseasoned wood, treated wood, plastic, oil, coal,
coloured paper, solvents or anything other than
properly prepared firewood.
Be sure to keep all combustibles outside of the fire
clearances as specified. See Section 6.6 for minimum
fire clearances. The heater is designed to have an open
or unpressurized water jacket. Pressurizing the heater
can cause damage the heater, property and/or cause
bodily harm.
Reference Section:
Wood Moisture
Requirements
8.2 Wood Fuel Requirements and
Guidelines
The only allowed fuel for the G-Class heaters is
properly seasoned firewood. Logs or split pieces
of wood with a diameter of less than 6" are best.
Larger pieces can be burned but the flame will not
be as intense and heat output will be reduced. The
moisture content of the wood used must be less than
24%. Wood with a moisture content under 20% is
even better and will provide the most efficient wood
burning. The manufacturer cannot and will not be
responsible for problems related to using wood that
is not adequately dry. Using wood that is freshly cut
or improperly seasoned may result in unpredictable
operation, poor efficiency and a shortened heater life.
As a general rule wood that is cut to length,
split and stacked under a roof without side walls for
one year will usually season to within the acceptable
24
Owner's manual for Polar Furnace models: G2, G2 Plus & G3
moisture range. Wood that has been properly stored
and seasoned for two years is better. The best way to
determine wood moisture content is with a moisture
meter.
Checking is a good indicator if a piece of wood
has been seasoned or not. Checking is cracks that
appear on the end of a log as it seasons or dries. Green
freshly cut wood will have no checking or cracks.
Seasoned wood will have checking on the ends. The
longer the wood seasons the more checking or cracks
will show. Review diagrams 8.1 to 8.4 showing green
and seasoned wood:
Diagram 8.1–Green, Split Wood: no
checking visible, indicates green, freshly cut
wood.
Diagram 8.2–Seasoned, Split Wood:
checking visible, indicates wood has been
seasoned.
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