Mr. Heater MH18B Operating Instruction
Operational Instructions Only - No Parts List
OPERATING INSTRUCTIONS
Model #
MH18B
AND OWNER’S MANUAL
READ INSTRUCTIONS CAREFULLY: Read and follow all instructions. Place instructions in a safe
place for future reference. Do not allow anyone who has not read these instructions to assemble,
light, adjust or operate the heater.
PORTABLE PROPANE HEATER FOR
RECREATIONAL AND COMMERCIAL USE
For California Sale
WARNING:
— Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any
other appliance.
— An LP cylinder not connected for use shall not be stored in the vicinity of this or any other appli-
ance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light appliance.
• Extinguish any open ame.
• Shut off gas to appliance.
— Service must be performed by a qualified service agency.
This is an unvented gas-red portable heater. It uses air (oxygen) from the area in which it is used.
Adequate combustion and ventilation air must be provided. Refer to page 2.
If the information in this manual is not followed exactly, a fire or explosion
may result causing property damage, personal injury or loss of life.
04/08 78438CAL Rev. DENERCO GROUP, INC., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 • 216-916-3000
WARNING:
Every time hose or tank is connected to unit, connection
must be checked for leaks in one or more ways: Apply
soapy water to connection, look for bubbles, listen for
hiss of escaping gas, feel for extreme cold, smell for rot-
ten egg odor. Do not use if leaking!
WARNING:
Any changes to this heater or its controls can be danger-
ous.
WARNING:
Early signs of carbon monoxide poisoning resemble the
flu, with headache, dizziness and/or nausea. If you have
these signs, heater may not be working properly. Get
fresh air at once! Have heater serviced.
CONTENTS
General Safety Instructions ............................................... 2
General Information .......................................................... 3
Operating with Disposable Propane Cylinders ...................3
Operating With Hose Connected to Remote Cylinder ........4
Maintenance.....................................................................5
Troubleshooting ................................................................ 6
Parts List ........................................................................... 6
Parts Ordering Information ............................................... 8
Service Information ...........................................................8
SPECIFICATIONS
MODEL NO. .....................................................MH18B
GAS TYPE ......................................................PROPANE
INPUT BTU/HR. ......................... 4,000 / 9,000 /18,000
CLEARANCE TO COMBUSTIBLES
TOP ....................................................................... 30”
FRONT ....................................................................24”
SIDES ......................................................................6”
REAR ....................................................................... 0”
WARNING:
If the recreational or commercial enclosure does not
have a window or roof vent, DO NOT USE THIS HEATER
INSIDE.
THE STATE OF CALIFORNIA REQUIRES THE
FOLLOWING WARNING:
WARNING:
Combustion by-products produced when using this product
contain carbon monoxide, a chemical known to the State
of California to cause cancer and birth defects (or other
reproductive harm).
GENERAL SAFETY INSTRUCTIONS
THIS IS A HEATING APPLIANCE. DO NOT OPERATE
THIS APPLIANCE WITHOUT THE FRONT WIRE GUARD
INSTALLED
• Due to high temperatures, the appliance should be
located out of traffic and away from combustible materials.
• Children and adults should be alerted to the hazard of
high surface temperatures and should stay away to avoid
burns or clothing ignition.
• Young children should be carefully supervised when they
are near the appliance.
• Do not place clothing or other flammable material on or
near the appliance.
• Do not operate heater in any moving vehicle.
• This heater can only be used in a recreational or com-
mercial enclosure with a window or roof vent. It may
also be used outdoors.
• This heater requires a vent area of 18 square inches
(example 4 1/4” x 4 1/4” opening) minimum for adequate
ventilation during operation. Do not use other fuel burning appliances inside.
• GAS PRESSURE AT HEATER IS REGULATED AND FIXED
AT 11” W.C. WHEN USING A REMOTE HOSE CONNECTION TO HEATER REGULATOR(S), DO NOT REGULATE
OR REDUCE PROPANE TANK SUPPLY PRESSURE TO
HEATER.
• WARNING: ANY HOSE CONNECTION TO A QUICK DIS-
CONNECT FITTING ON HEATER MUST BE REGULATED
TO 11” W.C. PRESSURE
• REGULATOR(S) IN HEATER MUST ALWAYS BE IN PLACE
DURING OPERATION.
• Any safety screen or guard removed for servicing the ap-
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2
pliance must be replaced prior to operating the heater.
• The appliance should be inspected before each use. Fre-
quent cleaning may be required. The control compartments, burner(s) and circulating air passageways of the
appliance must be kept clean, see MAINTENANCE.
• DO NOT use this heater if any part has been under
water. Immediately call a qualified service technician to
inspect the heater and to replace any part of the control
system and any gas control, which has been under water.
• When used without adequate combustion and ventila-
tion air, this heater may give off excessive CARBON
MONOXIDE, an odorless, poisonous gas.
• Some people - pregnant women, persons with heart
or lung disease, anemia, those under the influence of
alcohol, those at high altitudes - are more affected by
carbon monoxide than others.
• When heater is placed on the ground, make sure the
ground is level and keep any objects at least 24 inches
from the front of the heater. THIS HEATER IS EQUIPPED
WITH A TIP OVER SWITCH THAT WILL SHUT THE HEATER OFF IF THE HEATER TIPS OVER HOWEVER, DO NOT
LEAVE HEATER UNATTENDED OR WHERE CHILDREN
MAY CAUSE THE HEATER TO TIP OVER. NEVER OPERATE
THE HEATER WHILE SLEEPING!
• When the unit is lit, there should be about a quarter
inch border around the tile that will not turn bright
orange. This is normal.
• When operating the heater at altitudes over 7,000 FT.
above sea level, the unit may not burn as bright as in
lower altitudes. This is normal. At higher altitudes, the
heater may shut-off. If this happens, provide fresh air,
wait 5 minutes and re-light. Due to local atmospheric
conditions heater may not re-light.
• Operating time will vary depending on the heater set-
ting and the supply cylinder size. (One 1 lb. cylinder: 1.5
to 6 hours. Two 1 lb. cylinders: 3 to 12 hours. Two 20
lb. cylinders: 50 to 220 hours.) Heater may be operated
from quick disconnect, one or both regulated inlets.
• When moving heater when lit or bumping heater setting
it down, tip over switch may shut off heater. If this happens, re-light.
• NOTE: THIS HEATER MAY BE OPERATED WITH (1) OR (2)
DISPOSABLE 1 LB. PROPANE CYLINDERS OR WITH A REMOTE REFILLABLE CYLINDER(S) MAX. 20 LBS USING (1)
OR (2) F273701, F273702 OR F272702 HOSE ASSEMBLIES
WITH FUEL FILTERS (F273699) ON EACH HOSE ASSEMBLY.
IT MAY ALSO BE OPERATED WITH (1) F271802 HOSE
ASSEMBLY CONNECTED TO A REGULATED (11” W.C.)
PROPANE SOURCE OR (1) F271803 HOSE ASSEMBLY WITH
11” REGULATOR WITH ACME NUT.
GENERAL INFORMATION:
• This heater is safe for indoor use in small recreational
enclosures, having means for providing combustion air
and ventilation, such as enclosed porches, cabins, fishing
huts, trailers, tent trailers, tents, truck caps and vans. It
may be used in commercial enclosures, having means
for providing combustion air and ventilation, such as
construction trailers or temporary work enclosures.
Note: The heater can be used outdoors, but may experi-
ence nuisance shutoffs due to certain wind conditions.
• When the heater is cold or at room temperature, it will
take a few minutes for the burner(s) tile to turn bright
orange. This is normal and the heater is working properly. If burner(s) tile is visibly aming, turn heater off
and call a qualified service technician.
LIGHTING / OPERATING INSTRUCTIONS
FOR USE WITH DISPOSABLE 1 LB.
PROPANE CYLINDERS:
WARNING: Always inspect propane cylinder and heater propane
connections for damage, dirt, and debris before attaching
propane cylinder. Do not use if head of cylinder is damaged,
punctured or deteriorated.
ALWAYS ATTACH OR DETACH CYLINDER OUTDOORS AWAY
FROM FLAMES, OTHER IGNITION SOURCES, AND ONLY WHEN
HEATER IS COOL TO TOUCH. NEVER SMOKE WHEN ATTACHING
OR REMOVING PROPANE CYLINDER OR MAKING REMOTE
CONNECTIONS!
• Use only LP-gas cylinders marked in accordance with the
U.S. Dept. of Transportation (DOT).
• Use only 16.4 oz. (1 lb.) disposable cylinders that mate
with No. 600 valve connection.
• Heater and attached cylinder(s) must be in an upright
position during operation.
• Make sure ve-position Control Knob is in “OFF” posi-
tion; see Figure 1.
• Screw 1 lb. disposable LP-gas supply cylinder(s) clock-
wise (from bottom) into portable heater until hand-tight.
• Check cylinder(s) connection for leaks with soapy water
at the threaded connection under the domed plastic
cover where the cylinder screws into the regulator. SEE
WARNING! ON PLASTIC COVER DOORS.
• Depress and turn Control Knob counterclockwise to “PI-
LOT” position. Ignitor will spark to light the pilot burner.
(If needed, repeat these steps until pilot lights) and
continue to hold control knob down in “Pilot” position
for 30-60 seconds.
Operating Instructions and Owner’s ManualMr. Heater | Big Buddy/Tough Buddy
3
Fan Switch
Control Knob
Figure1
• After lighting pilot, release knob. Knob should return
to fully extended position. To operate heater slightly
depress knob and gently turn to lock in desired position.
• Turn control knob to “LO” or “MD” position to light
heater. Leave on “LO” or “MD” position until rst burner
tile has turned bright orange.
• After first burner tile has turned bright orange, adjust
heat output by turning Control Knob to desired position
(“LO”, “MD” or “HI”)
Warning:
DO NOT OPERATE HEATER UNLESS CONTROL KNOB IS LOCKED
IN A POSITION MARKED “HI”, “MD”, “LO” or “PILOT”. NEVER
SET CONTROL KNOB BETWEEN LOCKED POSITIONS. POOR
COMBUSTION AND HIGHER LEVELS OF CARBON MONOXIDE
MAY RESULT.
• For added heat circulation turn red fan switch to on. The
fan switch is located just left of control knob side handel
support. See Figure 1.
• Installation of 4 D-cell batteries is required for fan
operation. Battery box is located on lower back panel of
heater. Follow instructions on battery cover for correct
battery installation. See gure 2.
• Heater can also be powered by electrical adapter
F276127. Required adapter to be 6 volt DC up to 800 milliamp current with positive tip polarity. See gure 2.
• To shut off heater, slightly push down and turn Control
Knob clockwise to “OFF” position.
• CAUTION: After turning heater off, wire guard will
remain hot. Allow to thoroughly cool before storing.
• Do not operate, store or remove cylinder(s) near am-
mable items or ignition sources.
• LP-GAS CYLINDERS MUST BE DISCONNECTED FROM
HEATER WHEN NOT IN USE!
LIGHTING / OPERATING INSTRUCTIONS
FOR USE WITH HOSE(S) CONNECTED TO
A REMOTE CYLINDER, MAXIMUM SIZE 20
LBS:
• WARNING: ANY HOSE CONNECTION TO A QUICK DIS-
CONNECT FITTING ON HEATER MUST BE REGULATED
TO 11” W.C. PRESSURE
• This Heater may be used in a Recreational Enclosure or
Temporary Construction Work Enclosure with a Remote
Refillable Propane Cylinder ONLY when the Cylinder
is Located Outdoors and the Heater is Used with Mr.
Heater Hose No. F273701, F273702 or F272702 and fuel
lter F273699. Fuel lter must be replaced annually.
• Mr. Heater Hose No. F271802 which includes a quick
disconnect fitting and a 3/8” female flare fitting connected to a regulated (11” W.C.) propane source.
• Mr. Heater Hose No. F271803 which includes a quick
disconnect fitting and a 11” W.C. regulator.
• DANGER: NEVER bring a refillable propane cylinder
indoors. A re or explosion can occur causing property
damage, serious injury or death!
• Inspect the hose before each use of the heater. If there
is excessive abrasion or wear, or the hose is cut, replace
prior to using the heater with one of the Mr. Heater
Hose No’s. shown above.
• The propane cylinder must include a listed overfilling
protection device as well as a collar to protect the cylinder valve.
• Heater must be in an upright position during operation.
• Make sure ve-position Control Knob is in “OFF” posi-
tion; see Figure 1, at left.
• Screw hose connector into regulator on heater or con-
nect to quick disconnect and screw connector on other
end of hose into LP-gas supply cylinder valve. Tighten all
hose connections.
• Mr. Heater strongly recommends using disposable fuel
lter F273699 to trap any oil substances when connect-
ed to a remote cylinder that can make heater inoperable.
• Open valve at LP-gas supply cylinder.
• Check all hose connections for leaks with soapy water at
the threaded connection under the domed plastic cover
Electrical Adapter Outlet
Figure 2
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Electrical adapter
and batteries not included.
where the hose connector screws into the regulator and
at LP-gas supply cylinder. SEE WARNING! ON PLASTIC
DOORS.
• Depress and turn Control Knob counterclockwise to “PI-
LOT” position and hold down for 1 - 5 minutes. This may
take longer to purge air from the supply hose depending on the length of the hose being used.
• Depress and turn Control Knob counterclockwise to “PI-
LOT” position. Ignitor will spark to light the pilot burner.
(If needed, repeat these steps until pilot lights) and
continue to hold control knob down in “Pilot” position
for 30-60 seconds.
• After lighting pilot, release knob. Knob should return
to fully extended position. To operate heater slightly
depress knob and gently turn to lock in desired position.
• Turn control knob to “LO” or “MD” position to light
heater. Leave on “LO” or “MD” position until rst burner
tile has turned bright orange.
• After first burner tile has turned bright orange, adjust
heat output by turning Control Knob to desired position
(“LO”, “MD” or “HI” setting).
Caution: Do not try to adjust heating levels by using the
propane tank shut-off valve,
Warning:
DO NOT OPERATE HEATER UNLESS CONTROL KNOB IS LOCKED
IN A POSITION MARKED “HI”, “MD”, “LO”or “PILOT”. NEVER
SET CONTROL KNOB BETWEEN LOCKED POSITIONS. POOR
COMBUSTION AND HIGHER LEVELS OF CARBON MONOXIDE
MAY RESULT.
• Installation of 4 D-cell batteries is required for fan
operation. Battery box is located on lower back panel of
heater. Follow instructions on battery cover for correct
battery installation. See gure 2.
• Heater can also be powered by electrical adapter,
F276127. Required adapter to be 6 volt DC up to 800 milliamp current with positive tip polarity. See gure 2.
• To shut off heater, shut off propane at supply tank, al-
low heater to use-up propane in supply line until heater
shuts off, then slightly push down and turn Control
Knob clockwise to “OFF” position.
• CAUTION: After turning heater off, wire guard will
remain hot. Allow to thoroughly cool before storing.
• When not in use, the gas must be turned off at the
LP-gas supply cylinder. As stated before allow heater
to use up propane in supply line until heater shuts off.
When the LP-gas supply cylinder is not disconnected
from the heater, the heater and the cylinder must be
stored outdoors, in a well ventilated space, out of reach
of children, and must not be stored in a building, garage
or any other enclosed area.
• Indoor storage of the heater is permissible only if the
cylinder is disconnected and removed from the heater.
Cylinders must be stored outdoors out of the reach of
children and must not be stored in a building, garage or
any other enclosed area.
MAINTENANCE:
Always keep the heater area clear and free from combustible
materials, gasoline and other flammable vapors and liquids.
Keep the vent areas (slots in the bottom and the top at the front
of heater) clear at all times.
Visually inspect the pilot flame and burner periodically during
use. The pilot ame should be blue in color (not yellow) and will
extend beyond the thermocouple. The ame will surround the
thermocouple just below the tip, see Figure 3. A slight yellow
flame may occur where the pilot flame and main burner flame
meet. The burner(s) should be bright orange (with a slight blue
color around the border, a red-orange haze that is visible on the
ceramic tile is acceptable) and without a noticeable ame.
A blue flame that rolls out at the top of the ceramic tile indicates
an accumulation of dust, lint or spider webs inside the casing
assembly and main burner assembly. If the pilot is yellow or the
burner has a noticeable flame, cleaning may be required. Use
the following procedure to inspect the casing assembly and main
burner assembly.
It is necessary to periodically check the burner(s) orice and
burner venturi tube to make sure they are clear of insects/nests or
spider webs that may accumulate over time. A clogged tube can
lead to a fire.
1 Allow heater to thoroughly cool before performing any
maintenance.
2 Remove disposable 1 lb. cylinder(s) from heater or turn
OFF gas supply at remote cylinder valve, and disconnect
hose from heater.
3 Remove wire guard from front of heater by gently bend-
ing to remove from holes in front cover.
Figure 3
4 Remove (4) screws securing back cover to heater. Lift up
slightly to release (2) plastic hooks on top of back cover.
5 Remove back cover.
6 Remove (3) screws attaching lower bafe to expose
burner air openings.
7 Inspect interior of casing assembly for accumulation
of dust, lint or spider webs. If necessary, clean interior
of casing assembly with a vacuum cleaner or apply air
pressure. Do not damage any components within casing
assembly when you are cleaning.
8 Inspect and clean main burner orifice located at bottom
of burner venturi tube, by using a vacuum or apply air
pressure at orifice opening.
Operating Instructions and Owner’s ManualMr. Heater | Big Buddy/Tough Buddy
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