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Mr. Heater MH12HB - User Manual

Mr. Heater MH12HB
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2017 32097 CAN-CB
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.
DANGER:
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.
PORTABLE PROPANE HEATER FOR
RECREATIONAL, COMMERCIAL AND
EMERGENCY INDOOR USE
PORTABLE HUNTING BUDDY
RADIANT HEATER
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.
MH12HB
www.mrheater.com 800-251-0001
Model #
LANGUAGES INCLUDED:
Use only Mr. Heater branded accessories
(See page 9 for WARNING information)

Table of Contents

Questions and Answers

  • A
    Amanda BarnettJul 27, 2025
    Why does my Mr. Heater Heater keep shutting off?
    • B
      Brittany AndersonJul 27, 2025
      If your Mr. Heater Heater keeps shutting off, here's what you can check: * A blocked pilot can cause this, so clean the pilot. * Ensure a minimum fresh air opening of 9 square inches (e.g., a 3” x 3” opening). * If the heater was bumped, the tip-over switch may have been activated; try re-lighting it. * A defective regulator could be the issue; consider replacing it. * Internal contamination might be present; in this case, replace the control valve and regulator.
  • L
    Laura HaleAug 5, 2025
    What to do if the pilot light won't stay lit on my Mr. Heater Heater?
    • K
      Kathy FitzgeraldAug 5, 2025
      If the pilot flame on your Mr. Heater Heater doesn't stay lit when you release the knob, consider these possibilities: * The control knob might not be fully depressed in the “PILOT” position or held long enough to purge air from the lines. Ensure you check the control knob. * The pilot flame may not be surrounding the thermocouple adequately. If so, clean the pilot. * The pilot assembly could be defective and require replacement. * Disconnected tip switch wires can also cause this issue; make sure they are connected.
  • N
    nmossAug 16, 2025
    What to do if Mr. Heater Heater keeps shutting off?
    • B
      Brett HarrisAug 16, 2025
      If your Mr. Heater Heater keeps shutting off during normal operation, there are several potential causes: * A blocked pilot can cause the heater to shut off. Clean the pilot as described in the maintenance section. * The tip-over switch may have been activated. Re-light the heater. * A defective regulator may be the cause. Replace the regulator. * Internal contamination may cause the heater to shut off. Replace the control valve and regulator. Also, ensure a minimum fresh air opening of 9 square inches (e.g., a 3” x 3” opening) is provided.

Summary

General Safety Guidelines

Essential Safety Precautions

Essential safety guidelines for operating the heater, covering usage, placement, and supervision.

Heater Specifications

Technical Specifications & Clearances

Fuel Gas Odor and Leak Response

Responding to Suspected Gas Leaks

1 lb. Cylinder Operation

Connecting & Igniting with 1 lb. Cylinders

Instructions for safely connecting a 1 lb. propane cylinder and lighting the heater.

Remote Cylinder Operation

Connecting & Operating with 20 lb. Cylinders

Instructions for connecting to a remote 20 lb. propane cylinder and operating the heater.

Heater Maintenance

Cleaning & Inspection Procedures

Troubleshooting Guide

Common Issues & Solutions

Mr. Heater MH12HB Specifications

General IconGeneral
ModelMH12HB
TypePortable Propane Heater
Heat Output12, 000 BTU
Heating Area300 sq. ft.
Fuel TypePropane
IgnitionPiezo Ignition
Oxygen Depletion Sensor (ODS)Yes
Tip-Over Safety Shut-OffYes
BTU Output12, 000 BTU
ConnectionPropane Tank
Safety FeaturesOxygen Depletion Sensor (ODS), Tip-Over Safety Shut-Off

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