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Jøtul F 35 130074_1 6/22
5.0 Operation
Please read the following section before building the first fire in
your new Jøtul F 35 Rockwood.
5.1 Combustion Efficiency
The Jøtul F 35 Rockwood has an EPA tested High Heating Value
(HHV) efficiency rate of 68.47%. There are aspects of efficiency,
however, that you should be aware of in order to get the most from
your stove.
Operation habits and fuel moisture can have a significant effect on
efficiency. Poorly seasoned wood having a higher than optimum
moisture content, can reduce the amount of energy transferred to
the living area as a result of the energy expended to evaporate the
excess fuel moisture in order for the wood to burn. Operational
aspects, such as not building a robust kindling fire to readily ignite
the larger fuel pieces, can result in an inefficient smoldering fire.
Additionally, most modern wood heaters' optimum performance
and efficiency are at the medium to medium -to-low burn rates.
The location of the stove can have a significant effect on heating
efficiency, primarily in regard to heat distribution. For example,
a wood heater centrally located in the residence in an open living
area will likely provide better circulation of heat than will a stove
located in a room adjacent to the larger living area.
5.2 Minimize Carbon Monoxide Emissions
Testing the F 35 Rockwood to CSA B414.1-10 resulted in a carbon
monoxide emission rate of 1.35 grams per minute. Most means of
combustion produce CO, including wood fires. Maintaining a well-
established fire and avoiding operation that produces a smoldering,
smoky fire, will greatly reduce CO levels.
It is highly recommended that a CO monitor (detector) be
installed in the same room as the stove. The monitor, however,
should be located as far away as possible from the stove to avoid
alert soundings when adding fuel to the fire.
5.3 Wood Fuel and Performance
Jøtul specifies the use of only 16" fuel for several important
reasons. Foremost, the combustion system was specifically
designed for optimum performance with 16" fuel. There can
be several unwanted consequences of using fuel longer than
16". Longer fuel pieces can potentially diminish combustion
and emissions performance. Longer pieces can also present an
interference with proper door closing operation and potentially
result in broken glass should the fuel extend to the opening of the
firebox
The F 35 Rockwood is designed to burn natural wood only. Higher
efficiencies and lower emissions generally result when burning
air-dried, seasoned hardwoods, as opposed to softwoods, green or
freshly cut hardwoods. Wood that has been air-dried for a period
of 6 to 14 months will provide the cleanest, most efficient heat.
Wood seasoned more than 2 years will burn too quickly to take
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advantage of the stove's low end efficiency strength. A seasoned
log will have check marks (cracks) on the ends and be lighter than
an unseasoned log which will show little or no check marks.
We recommend using a moisture meter to determine the
moisture content of your wood. For purposes of home heating,
your fuel should have a moisture content between 12 - 20%. Wood
with higher moisture content will burn, however, very inefficiently.
Most of its heat value will be lost to driving water out of the wood.
Worse, that moisture will condense as creosote in the relatively
cool chimney flue, increasing the potential for a chimney fire.
Use of unseasoned wood defeats the purpose of any modern wood-
burning stove.
BURN UNTREATED WOOD ONLY. DO NOT BURN:
• Coal
• Synthetic fuel or logs
• Materials containing asbestos
• Manure or animal remains
• Material containing rubber, including tires
• Waste petroleum products, asphalt products, paints,
paint thinners or solvents
• Construction or demolition debris
• Railroad ties or pressure-treated wood
• Salt water driftwood or other previously salt-water;
saturated materials
• Paper products, cardboard, plywood, or particle board. (The
prohibition against burning these materials does not prohibit the use
of fire starters made from paper, cardboard, saw dust, wax or similar
substances for the purpose of starting a fire.)
Burning of any of the materials listed above can result in the release
of toxic fumes, cause smoke, or render the heater ineffective and
cause smoke
• NEVER USE GASOLINE, GASOLINE-TYPE LANTERN FUEL,
KEROSENE, CHARCOAL LIGHTER FLUID OR SIMILAR
LIQUIDS TO START OR "FRESHEN-UP" THE FIRE. ALWAYS
KEEP SUCH LIQUIDS AWAY FROM THE HEATER AT ALL
TIMES.
WARNING
ALWAYS WEAR STOVE GLOVES WHILE TENDING
THE FIRE.
NEVER ALLOW THE FIRE TO REST DIRECTLY ON
THE GLASS. KEEP THE LOGS SPACED AT LEAST ONE
INCH FROM THE GLASS TO ALLOW FOR PROPER
AIR FLOW WITHIN THE STOVE. AVOID STRIKING
THE GLASS WITH LOGS.
OPERATE THIS STOVE ONLY WITH THE FRONT
DOOR FULLY CLOSED. OPERATION WITH THE
DOOR PARTIALLY OPEN MAY RESULT IN OVER-
FIRING. IF THE DOOR IS LEFT PARTIALLY OPEN,
GAS AND FLAME MAY BE DRAWN OUT OF THE
STOVE CREATING SAFETY RISKS FROM BOTH
FIRE AND SMOKE.
• Garbage
• Material containing plastics
• Unseasoned wood
• Lawn clippings or yard waste
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