Serial numbers on back cover.
Model #
OPERATING INSTRUCTIONS
AND OWNER’S MANUAL
MH9BX
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
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.
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
appliance.
— WHAT TO DO IF YOU SMELL GAS
•
•
•
Do not try to light appliance.
Shut off gas to appliance.
— Service must be performed by a qualified service agency.
Adequate combustion and ventilation air must be provided. Refer to page 3.
MR. HEATER, INC., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 • 216-916-3000
02/09 32030
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partments, burner and circulating air passageways of
the appliance must be kept clean, see MAINTENANCE.
• Get everyone out of the building and away from the
area immediately.
• Close all propane (LP) gas tank or cylinder fuel supply
valves, or the main fuel supply valve located at the
meter if you use natural gas.
• Propane (LP) gas is heavier than air and may settle in
low areas. When you have reason to suspect a propane
leak, keep out of all low areas.
• Use your neighbor’s phone and call your fuel gas
supplier and your fire department. Do not re-enter the
building or area.
• Stay out of the building and away from the area until
declared safe by the firefighters and your fuel gas
supplier.
• FINALLY, let the fuel gas service person and the
firefighters check for escaped gas. Have them air out
the building and area before you return. Properly trained
service people must repair any leaks, check for further
leakages, and then relight the appliance for you.
• 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 wa-
ter.
• 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 HEAT-
ER 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!
OdOr Fading ‑ nO OdOr detected
• Some people cannot smell well. Some people cannot
smell the odor of the man-made chemical added to
propane (LP) or natural gas. You must determine if you
can smell the odorant in these fuel gases.
• Learn to recognize the odor of propane (LP) gas and
natural gas. Local propane (LP) gas dealers will be more
than happy to give you a scratch and sniff pamphlet.
Use it to become familiar with the fuel gas odor.
• Smoking can decrease your ability to smell. Being
around an odor for a period of time can affect your
sensitivity to that particular odor. Odors present in
animal confinement buildings can mask fuel gas odor.
• the odorant in propane (lp) gas and natural gas
is colorless and the intensity of its odor can fade
under some circumstances.
OdOr Fade warning
warning
asphyxiation Hazard
• Do not use in unventilated areas.
• The flow of combustion and ventilation air must
not be obstructed.
• Proper ventilation air must be provided to
support the combustion air requirements of the
heater being used.
• Refer to the specification section of the heater’s
manual, heater dataplate, or contact the factory
to determine combustion air ventilation
requirements of the heater.
• If there is an underground leak, the movement of gas
through the soil can filter the odorant.
• Propane (LP) gas odor may differ in intensity at different
levels. Since Propane (LP) gas is heavier than air, there
may be more odor at lower levels.
• Always be sensitive to the slightest gas odor. If you
continue to detect any gas odor, no matter how small,
treat it as a serious leak. Immediately go into action as
discussed previously.
• Lack of proper ventilation air will lead to
improper combustion.
• Improper combustion can lead to carbon
monoxide poisoning leading to serious injury or
death. Symptom of carbon monoxide poisoning
can include headaches, dizziness and difficulty
in breathing.
attentiOn ‑ critical pOints tO
reMeMBer!
• Propane (LP) gas has a distinctive odor. Learn to
recognize these odors. (Reference Fuel Gas Odor and
Odor Fading sections above.
• Even If you are not property trained in the service and
repair of the heater, ALWAYS be consciously aware of
the odors of propane (LP) gas and natural gas.
• If you have not been properly trained in repair and
service of propane (LP) gas then do not attempt to
light heater, perform service or repairs, or make any
adjustments to the heater on the propane (LP) gas fuel
system.
Fuel gas OdOr
lp gas and natural gas have man‑made odorants
added specifically for detection of fuel gas leaks.
if a gas leak occurs you should be able to smell the
fuel gas. since propane (lp) is heavier than air you
should smell for the gas odor low to the floor. anY
gas OdOr is YOur signal tO gO intO iMMediate
actiOn!
• Do not take any action that could ignite the fuel gas.
Do not operate any electrical switches. Do not pull
any power supply or extension cords. Do not light
matches or any other source of flame. Do not use your
telephone.
Mr. Heater | Portable Propane Heater
Operating Instructions and Owner’s Manual
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propane cylinder. Do not use if head of cylinder is damaged,
punctured or deteriorated.
• A periodic sniff test around the heater or at the heater’s
joints; i.e. hose, connections, etc., is a good safety
practice under any conditions. If you smell even a small
amount of gas, CONTACT YOUR FUEL GAS SUPPLIER
IMMEDIATELY. DO NOT WAIT!
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 CONNEC-
TIONS!
general inFOrMatiOn:
• Use only LP-gas
cylinders marked in
accordance with the
U.S. Dept. of Trans-
portation (DOT).
• 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 for emergency indoor heating when
connected to a disposable 1-lb. propane cylinder and
for indoor use in commercial enclosures, having means
for providing combustion air and ventilation, such as
construction trailers or temporary work enclosures.
• Use only 16.4 oz.
(1 lb.) disposable
cylinders that mate
with No. 600 valve
connection.
• Heater and attached
cylinder must be in
an upright position
note: The heater can be used outdoors, but may experi-
ence nuisance shutoffs due to certain wind conditions.
during operation.
Figure 1: “Off” position.
• When the heater is cold or at room temperature, it will
take a few minutes for the burner tile to turn bright or-
ange. This is normal and the heater is working properly.
If burner tile is visibly flaming, turn heater off and call a
qualified service technician.
• Make sure four-po-
sition Control Knob
is in “OFF” position;
see Figure 1.
• Swivel regulator out-
ward for easy tank
installation. Screw 1
lb. disposable LP-gas
supply cylinder clock-
wise (from bottom)
into portable heater
until hand-tight; see
Figure 2.
• When the unit is lit, there should be about a quarter
inch (1/4”) border around the tile that will not turn
bright orange. This is normal.
• When operating the heater for the first time, the top
area of the reflector may discolor. This is also normal
and is no reason for concern.
• The protective grill on the front of this heater is coated
with a special high-temperature resistant paint. When
the heater is used for the first time, the grill may give
off noticeable smoke or fumes. This is normal and will
not occur during subsequent uses. The fumes are not
harmful.
• Check cylinder con-
nection for leaks
with soapy water at
the threaded con-
nection under the
domed plastic cover
where the cylinder
screws into the regu-
lator. SEE
Figure 2: Attach fuel tank
• 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.
WARNING! ON
• Operating time will vary depending on the heater set-
ting and the supply cylinder size. Up to 3 to 6 hours
on a 1 lb. cylinder. Up to 48 to 110 hours on a 20 lb.
cylinder (based on “HI” and “LO” settings).
DOMED PLASTIC
COVER.
¥
¥
¥
• Turn Control Knob
counterclockwise to
“PILOT” position and
depress to light; see
Figure 3.
• When moving heater when lit or bumping heater setting
it down, tip over switch may shut off heater. If this hap-
pens, re-light.
Figure 3: Ignition
• Due to natural operation of small tanks, condensation
• If heater does not light, hold down for approximately 30
seconds; release and depress again. Repeat until pilot
lights.
may build up on tank and drip on surface under heater.
ligHting / Operating instructiOns
FOr use witH dispOsaBle 1 lB. prOpane
• After pilot lights, hold down for 30 -60 seconds and
then release knob. Knob should return to fully extended
position; see Figure 4. To operate heater slightly depress
knob and gently turn to lock in the “HI” position to light
cYlinders:
warning: Always inspect propane cylinder and heater pro-
pane connections for damage, dirt, and debris before attaching
Mr. Heater | Portable Propane Heater
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burner tile. Leave on
“HI” position until
burner tile turns
bright orange.
Screw hose connector into regulator on heater 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
filter F273699 to trap any oil substances when connect-
ed to a remote cylinder that can make heater inoper-
able.
• After burner tile has
turned bright orange,
adjust heat output by
turning Control Knob
to desired position
• 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
where the hose connector screws into the regulator and
at LP-gas supply cylinder. SEE WARNING!
¥
(“LO” or “HI” setting)
¥
¥
• Turn Control Knob counterclockwise to “PILOT” position
and depress to light; see Figure 3. This may take longer
to purge air from the supply hose depending on the
length of the hose being used.
Figure 4: Release knob.
warning:
DO NOT OPERATE HEATER UNLESS CONTROL KNOB IS
LOCKED IN A POSITION MARKED “HI”, “LO” or “PILOT”.
NEVER SET CONTROL KNOB BETWEEN LOCKED POSI-
TIONS. POOR COMBUSTION AND HIGHER LEVELS OF
CARBON MONOXIDE MAY RESULT.
• If pilot does not light, hold down for approximately 30
seconds; release and depress again. Repeat until pilot
lights.
• After pilot lights, hold down for 30 -60 seconds and
then release knob. Knob should return to fully extended
position; see Figure 4. The pilot should remain lit. To
operate heater slightly depress knob and gently turn to
lock in the “HI” position to light burner tile. Leave on
“HI” position until burner tile turns bright orange.
• 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.
• After burner tile has turned bright orange, adjust heat
output by turning Control Knob to desired position
(“LO” or “HI” setting).
• Do not operate, store or remove cylinder near flam-
mable items or ignition sources.
• LP-GAS CYLINDERS MUST BE DISCONNECTED FROM
HEATER WHEN NOT IN USE!
caution: Do not try to adjust heating levels by using the
propane tank shut off valve.
ligHting / Operating instructiOns FOr
use witH HOse cOnnected tO a reMOte
cYlinder, MaXiMuM siZe 20 lBs:
warning:
DO NOT OPERATE HEATER UNLESS CONTROL KNOB IS
LOCKED IN A POSITION MARKED “HI”, “LO” or “PILOT”.
NEVER SET CONTROL KNOB BETWEEN LOCKED POSI-
TIONS. POOR COMBUSTION AND HIGHER LEVELS OF
CARBON MONOXIDE MAY RESULT.
• 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 filter
F273699. Fuel filter must be replaced annually. (NOTE:
Do not operate without the fuel filter as fuel contamina-
tion may damage the heater.) Or use green F273704
Buddy series hose. Fuel filter not required.
• to shut off heater, shut off propane at supply tank,
allow heater to use‑up propane in supply line un‑
til heater shuts off, then slightly push down and
turn control Knob clockwise to “OFF” position.
• cautiOn: After turning heater off, wire guard will
• danger: NEVER bring a refillable propane cylinder
indoors. A fire or explosion can occur causing property
damage, serious injury or death!
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.
• 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 cylin-
der valve.
• 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.
• Heater must be in an upright position during operation.
• Make sure four-position Control Knob is in “OFF” posi-
tion; see Figure 1, at left.
• Swivel regulator outward for easy hose installation.
Mr. Heater | Portable Propane Heater
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assembly venturi with (2) two screws.
Maintenance:
Always keep the heater area clear and free from combus-
tible materials, gasoline and other flammable vapors and
liquids.
8 Inspect and clean pilot (mounted to bracket) by using a
vacuum or apply air pressure through the holes in the
pilot indicated by the arrows in Figure 5.
warning: Never use needles, wires, or similar cylin-
drical objects to clean the pilot to avoid damaging the
calibrated orifice that controls the gas flow.
Keep the vent areas (slots in the bottom and the top at the
front and rear of
heater) clear at all
times.
9 Apply air pressure (max. 30 psi.) into ceramic tile of
burner assembly and the venturi tube (ref. item #17) to
remove dust, lint or spider webs.
Visually inspect the
pilot flame and
10 Reassemble main burner orifice holder onto the burner
assembly.
burner periodically
during use. The
pilot flame should
be blue in color
(not yellow) and
11 Reinstall burner assembly into the heater housing.
12 Reinstall fuel line and check for leaks.
13 Install heater back cover.
will extend beyond
the thermocouple.
The flame will surround the thermocouple just below the
tip, see Figure 5.
Figure 5
trOuBlesHOOting inFOrMatiOn:
If Spark electrode does not produce spark.
CHECK
• Spark electrode broken – replace ODS (Oxygen Depletion
Sensor).
A slight yellow flame may occur where the pilot flame
and main burner flame meet. The burner 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 flame. 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.
• Igniter wire may not be attached to spark electrode.
• Igniter wire damaged – replace.
• Piezo igniter defective – replace control valve.
If Spark electrode produces spark but pilot does not light.
CHECK
• No gas to heater – install disposable cylinder or connect
hose and filter where required and turn on valve at remote
cylinder.
• “PILOT” position not properly aligned – turn gas control
knob to “PILOT” position and depress.
• Pilot is blocked from spider web or dirt – clean pilot, see
MAINTENANCE.
If Pilot flame does not stay lit when knob is released.
CHECK
It is necessary to periodically check the burner orifice 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.
• Control knob in “PILOT” position not completely depressed
or held in long enough to purge air from lines.
• Pilot flame not surrounding thermocouple – clean pilot, see
1 Allow heater to thoroughly cool before performing any
maintenance.
MAINTENANCE.
• Pilot Assembly defective – replace.
• Tip switch wires disconnected – connect.
If Main burner does not ignite.
CHECK
• Main burner orifice is blocked – clean burner, see MAINTE-
NANCE.
If Heater keeps shutting “OFF” during normal operation.
CHECK
2 Remove disposable 1 lb. cylinder from heater or turn
OFF gas supply at remote cylinder valve, and disconnect
hose from heater.
3 Remove (4) four screws that secure the rear cover to the
Heater.
4 Pivot cover outward from bottom. Release from 2 top
clips. Set aside.
• Pilot is blocked – clean pilot, see MAINTENANCE.
• Provide minimum fresh air opening of 9 square inches
(example 3” x 3” opening).
5 Remove (4) four burner retaining screws and fuel line
from burner assembly. Remove burner assembly from
back of housing.
• Tip over switch activated from bumping heater. Re-light.
• Regulator defective - Replace regulator.
6 Inspect interior of housing for accumulation of dust, lint
or spider webs. If necessary, clean interior housing with
a vacuum cleaner or apply air pressure. Do not damage
any components within the housing assembly when you
are cleaning.
• Internal contamination - Replace control valve and regulator.
• Call Technical Services for additional information.
7 Inspect and clean main burner orifice (threaded into
orifice holder). Orifice holder is attached to the burner
Mr. Heater | Portable Propane Heater
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Mr. Heater • Portable Propane Heater • Model # MH9BX
6
7
1
5
2
4
9
3
10
11
8
12
13
accessOries:
ITEM # descriptiOn
16
18
F273701 5 ft. PROPANE HOSE ASSEMBLY
(Swivel 1”-20 Male Throwaway
Cyl. Thd. X P.O.L. w/Handwheel)
(Recommended use with fuel
filter.)
14
25
F273702 12 ft. PROPANE HOSE ASSEMBLY
(Swivel 1”-20 Male Throwaway
Cyl. Thd. X P.O.L. w/Handwheel)
(Recommended use with fuel
filter.)
15
17
21
F272702 12 ft. PROPANE HOSE ASSEMBLY
(Swivel 1”-20 Male Throwaway
Cyl. Thd. X P.O.L. w/Handwheel)
(Recommended use with fuel
filter.)
19
20
24
22
F273699 Fuel Filter (Replace Annually)
23
F273704 10 ft. BUDDY-SERIES HOSE
ASSEMBLY (Fuel filter not
required)
replaceMent parts list:
No. Part# Description
No. Part# Description
No. Part# Description
8. 32027 Brkt, Valve
9. 32028 Heat, Shield
1. 32017 Knob, Valve, Safety, Red
17. 33090 Housing, Right, Plastic, Gray
33091 Housing, Right, Plastic, Black
32019 Knob, Valve, Safety, Green
2. 32054 Valve, Assy, Control
3. 32056 Tube, Burner, Main
4. 32053 Tube, Inlet, Assy
18. 32068 Orifice, Assy with O-Ring
19. 32052 Orifice, Holder
10. 32015 Handle, Back, Plastic, Gray
32074 Handle, Back, Plastic, Black
11. 32014 Handle, Front, Plastic, Gray
32072 Handle, Front, Plastic, Black
20. 32023 Floor, Panel, Metal
21. 73403 Switch, Tipover
5. 32051 Guard, Wire
32061 Guard, Wire, Heavy
12. 75198 Assy, Regulator, w/Support
22. 32046 Brkt,ODS (Oxygen Depletion Sensor)
23. 73404 ODS, Pilot, Assy
6. 33092 Panel, Front, Metal, Red
33094 Panel, Front, Metal, Yellow
33093 Panel, Front, Metal, Green
13. 32080 Housing, Left, Plastic, Gray
32085 Housing, Left, Plastic, Black
24. 32057 Tube, Pilot, Assy
14. 32021 Reflector, Metal
25. 32067 Magnet, Tank
7. 75191
Panel, Back, Metal, w/32004, Red
15. 33088 Tile, Replacement Kit, MH9BX
16. 32032 Burner, Assy
75194 Panel, Back, Metal, w/32004, Yellow
75196 Panel, Back, Metal, w/32004, Green
Mr. Heater | Portable Propane Heater
Operating Instructions and Owner’s Manual
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Model #
MH9BX
OPERATING INSTRUCTIONS
AND OWNER’S MANUAL
WARNING:
USE ONLY MANUFACTURER’S REPLACEMENT PARTS. USE OF ANY OTHER PARTS
COULD CAUSE INJURY OR DEATH. REPLACEMENT PARTS ARE ONLY AVAILABLE
DIRECT FROM THE FACTORY AND MUST BE INSTALLED BY A QUALIFIED SERVICE
AGENCY. MR. HEATER HOSES F273701, F273702 AND F272702 ARE SPECIFICALLY
DESIGNED FOR USE WITH THIS HEATER ALONG WITH F273699 DISPOSABLE FUEL
FILTER (REPLACE ANNUALLY) OR HOSE F273704 (FILTER NOT REQUIRED). USE OF
OTHER HOSES MAY CAUSE THE HEATER TO BECOME INOPERABLE.
PARTS ORDERING INFORMATION:
PURCHASING: Accessories may be purchased at any Mr. Heater local dealer or
direct from the factory
Heaters with
Starting Serial#
FOR INFORMATION REGARDING SERVICE
MHC-320000000001
MHC-320100000001
MHC-320200000001
MHC-320400000001
MHC-320600000001
Please call Toll-Free 800-251-0001
Please include the model number, date of purchase, and description of problem in
all communication.
LIMITED WARRANTY
Mr. Heater, Inc. warrants its heaters and accessories to be free from defects in
material and workmanship for a period of 1 year from date of purchase. Mr. Heater,
Inc. will repair or replace this product free of charge if it has been proven to be
defective within the 1-year period, and is returned at customer expense with proof
of purchase to Mr. Heater, Inc. within the warranty period.
Mr. Heater, Inc. reserves the right to make changes at any time, without notice or
obligation, in colors, speci¯cations, accessories, materials and models.
MR. HEATER, INC., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 • 800-251-0001
Mr. Heater and Portable Buddy are registered trademarks of Enerco Group, Inc.
© 2009, Enerco/Mr. Heater. All rights reserved
CSA 4.98
U.S.
03/09 32030
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