Mr. Heater MH18B Owners Manual
OPERATING INSTRUCTIONS AND OWNER’S MANUAL
PORTABLE BIG BUDDY
RADIANT HEATER
Model #
MH18B
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
USED FOR:
RECREATIONAL
AND COMMERCIAL
For Canada & Massachusetts Sale
Use only Mr. Heater branded accessories
(See page 10 for WARNING information)
!
DANGER:
CARBON MONOXIDE HAZARD
This appliance can produce carbon
monoxide which has no odor.
Using it in an enclosed space can kill you.
Never use this appliance in an enclosed
space such as a camper, tent, car or
home.
LANGUAGES INCLUDED:
•ENGLISH
•FRENCH
FOR YOUR SAFETY
If you smell gas:
1. Do not attempt to light appliance.
2. Extinguish any open flame.
3. Disconnect from fuel supply.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
www.mrheater.com 800-251-0001
2017 78438 CAN-CB
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Mr. Heater | Big Buddy Operating Instructions and Owner’s Manual
2
WARNING:
Any changes to this heater or its controls can be
dangerous.
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.
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 rotten
egg odor. Do not use if leaking!
THE STATE OF CALIFORNIA REQUIRES THE FOLLOWING WARNINGS:
WARNING: Combustion by-products produced when using this product contain carbon monoxide, a chemi-
cal known to the State of California to cause cancer and birth defects (or other reproductive harm).
WARNING: This product contains chemicals known to the State of California to cause cancer and birth
defects or other reproductive harm.
NOTICE: Not for use in a “dwelling home” in California.
CONTENTS
General Safety Instructions ............................................... 3
General Information .......................................................... 4
Operating with Disposable Propane Cylinders ................... 5
Operating With Hose Connected to Remote Cylinder ........6
Maintenance.....................................................................7
Troubleshooting ................................................................ 7
Parts List ........................................................................... 8
Parts Ordering Information ............................................. 10
Service Information ......................................................... 10
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”
CAUTION:
•Some carpets or linoleum surfaces may discolor if heater is
placed directly on these floor coverings.
•When operating the heater at altitudes over 7,000 FT above sea
level the heater may shut off. (Please read the GENERAL
INFORMATION)
GENERAL SAFETY INSTRUCTIONS
THIS IS A HEATING APPLIANCE. DO NOT OPERATE
THIS APPLIANCE WITHOUT THE FRONT WIRE GUARD
INSTALLED. DO NOT ATTEMPT TO WARM OR COOK
FOOD ON THIS HEATER.
• Do not use non-approved attachments on this heater.
• Due to high temperatures, the appliance should be lo-
cated 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 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 TANK SWIVEL(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 IN HEATER MUST ALWAYS BE IN PLACE
DURING OPERATION.
• Any safety screen or guard removed for servicing the ap-
pliance must be replaced prior to operating the heater.
• The appliance should be inspected before each use. Fre-
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Operating Instructions and Owner’s ManualMr. Heater | Big Buddy
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!
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 rotten 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.
GENERAL INFORMATION:
• 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 flaming, turn heater off
and call a qualified service technician.
• 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-of f. 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 tank swivel inlets.
Due to the properties of LP gas, run times can be signifi-
cantly reduced when operating continuously at tempera-
tures below 20º F. Use of a 20lb tank is recommended in
these conditions.
• 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)(Fig. A) ON
EACH HOSE ASSEMBLY. HOSE NO. F273704 BUDDY
SERIES HOSE, FUEL FILTER NOT REQUIRED. IT MAY
ALSO BE OPERATED WITH (1) F271802 HOSE ASSEMBLY
CONNECTED TO A REGULATED (11” W.C.) PROPANE
SOURCE *FILTER NOT REQUIRED* OR (1) F271803 HOSE
ASSEMBLY WITH 11” REGULATOR WITH ACME NUT
*FILTER NOT REQUIRED*.
WARNING:
DO NOT USE THIS HEATER INSIDE!
F273699 - Fuel Filter accessory used with
hose assemblies
Accessory Not Included
Mr. Heater | Big Buddy Operating Instructions and Owner’s Manual
4
Figure A
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 five-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.
DO NOT use thread sealant on this connection.
• Check cylinder(s) connection for leaks with soapy water
at the threaded connection under the domed plastic
cover where the cylinder screws into the tank swivel.
SEE WARNING!
• Depress the Control Knob and turn counterclockwise to
the pilot postion.
Fan Switch
• Once the pilot has lit, hold the Control Knob down for
an additional 30 seconds to heat the thermocouple.
After 30 seconds, release the Control Knob and the pilot
should remain lit.
• If the pilot goes out repeat the lighting procedure.
• After lighting pilot, release Control Knob. Control 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 first 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”) NOTE: Both tiles ignite only when
Control Knob is positioned on ‘HI’. (2) 1 LB. propane
bottles are needed to use heater in (HI) position.
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 figure 2.
• Heater fan can also be powered by electrical adapter
F276127. Required adapter to be 6 volt DC up to 800 mil-
liamp current with positive tip polarity. See figure 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 flam-
mable items or ignition sources.
• LP-GAS CYLINDERS MUST BE DISCONNECTED FROM
HEATER WHEN NOT IN USE!
Control Knob
Figure1
• Hold Control Knob down in the pilot position for 30-40
seconds.
• While holding down the Control Knob, rotate clockwise
to the OFF position and immediately turn back to the
pilot position, a spark will be generated at the pilot assembly and the heater should light.
• If the heater does not light on the first attempt, repeat
the procedure.
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Operating Instructions and Owner’s ManualMr. Heater | Big Buddy
LIGHTING / OPERATING INSTRUCTIONS
FOR USE WITH HOSE(S) CONNECTED TO
A REMOTE CYLINDER, MAXIMUM SIZE 20
LBS:
• WARNING: ANY HOSE CONNECTION TO A QUICK
DISCONNECT FITTING ON HEATER MUST BE
REGULATED TO 11” W.C. PRESSURE
• 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 fire 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 five-position control knob is in “OFF” position;
see Figure 1, at left.
• Mr. Heater strongly recommends using disposable
fuel filter F273699, which connects to tank swivel on
heater to trap any oil substances when connected to a
remote cylinder that can make the heater inoperable.
• Screw hose connector into tank swivel or fuel filter on
heater or connect to quick disconnect and screw con-
nector on other end of hose into LP-gas supply cylinder
valve. Tighten all hose connections. DO NOT use thread
sealant on any of these connections.
• 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 tank swivel
and/or fuel filter and at LP-gas supply cylinder. SEE
WARNING!
• Depress the control knob and turn counter-clockwise to
the pilot position.
Electrical Adapter Outlet
Electrical adapter
Figure 2
Mr. Heater | Big Buddy Operating Instructions and Owner’s Manual
• Hold control knob down in the pilot position for 1-5
seconds.
• While holding down the control knob, rotate clockwise
to the OFF position and immediately turn back to the
pilot position, a spark will be generated at the pilot assembly and the heater should light.
• If the heater does not light on the first attempt, repeat
the procedure.
• Once the pilot has lit, hold the control knob down for
an additional 30 seconds to heat the thermocouple.
After 30 seconds, release the control knob and the pilot
should remain lit.
• If the pilot goes out repeat the lighting procedure.
• 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 first 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).(2) 1 LB. propane bottles
are needed to use heater in (HI) position.
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 COMBUS-
TION 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 figure 2.
• Heater fan can also be powered by electrical adapter,
F276127. Required adapter to be 6 volt DC up to 800 mil-
liamp current with positive tip polarity. See figure 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.
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