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.

Mr. Heater MH12HB Specifications

General

Model	MH12HB
Type	Portable Propane Heater
Heat Output	12, 000 BTU
Heating Area	300 sq. ft.
Fuel Type	Propane
Ignition	Piezo Ignition
Oxygen Depletion Sensor (ODS)	Yes
Tip-Over Safety Shut-Off	Yes
BTU Output	12, 000 BTU
Connection	Propane Tank
Safety Features	Oxygen Depletion Sensor (ODS), Tip-Over Safety Shut-Off

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

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