3
Operating Instructions and Owner’s ManualMr. Heater | Big Buddy/Tough Buddy
05/06 78438CAL Rev. L1
WARNING:
Every time hose or tank is connected to unit, connec-
tion 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
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.
SPECIFICATIONS
MODEL NO. ................................................ MH18B
GAS TYPE ............................................. PROPANE
INPUT BTU/HR..................... 4,000 / 9,000 /18,000
CLEARANCE TO COMBUSTIBLES
T O P .................................................................... 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).
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
• 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
commercial 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 ad-
equate 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 DISCONNECT FITTING ON HEATER
MUST BE REGULATED TO 11” W.C. PRESSURE
• REGULATOR IN HEATER MUST ALWAYS BE IN PLACE
DURING OPERATION.
GENERAL SAFETY INSTRUCTIONS
THIS IS A HEATING APPLIANCE. DO NOT OPERATE
THIS APPLIANCE WITHOUT THE FRONT WIRE
GUARD INSTALLED
Caution: Some carpets or linoleum surfaces may discolor if
heater is placed directly on these floor coverings.