Mr.Heater MH4B PORTABLE RADIANT BUDDY HEATER OPERATING INSTRUCTIONS AND OWNERS MANUAL

: June 15, 2024
: Mr.Heater

Table of Contents

Mr. Heater MH4B PORTABLE RADIANT BUDDY HEATER
GENERAL SAFETY INSTRUCTIONS
LIGHTING / OPERATING INSTRUCTIONS
MAINTENANCE
TROUBLESHOOTING INFORMATION
PARTS LIST
LIMITED WARRANTY
FAQs
Video-How to use
Reference Link
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Mr. Heater MH4B PORTABLE RADIANT BUDDY HEATER

Mr. Heater-MH4B-PORTABLE-RADIANT-BUDDY-HEATER-product

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.

WARNING: 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.

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 appliances.
- Extinguish any open flame.
- Shut off the gas to the appliance.
Service must be performed by a qualified service agency.
This is an unvented gas-fired portable heater. It uses air (oxygen) from the area in which it is used.
Adequate combustion and ventilation air must be provided.

WARNING:

Every time a hose or tank is connected to the unit, the connection must be checked for leaks in one or more ways: Apply soapy water to the connection, look for bubbles, listen for hiss of escaping gas, feel for extreme cold, smell for rotten egg odor. Do not use if leaking!
Any changes to this heater or its controls can be dangerous.
Early signs of carbon monoxide poisoning resemble the flu, with headache, dizziness and/or nausea. If you have these signs, the heater may not be working properly. Get fresh air at once! Have heater serviced.
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 WARNINGS:
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).
WARNING :
Early signs of carbon monoxide poisoning resemble the flu, with headache, dizziness and/or nausea. If you have these signs, the heater may not be working properly. Get fresh air at once! Have heater serviced.
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.

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 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 4 square inches (example 2” x 2” opening) minimum for adequate ventilation during operation. Do not use other fuel-burning appliances inside.
GAS PRESSURE AT THE HEATER IS REGULATED AND FIXED AT 11” W.C.
THE REGULATOR IN THE HEATER MUST ALWAYS BE IN PLACE DURING OPERATION.
Any safety screen or guard removed for servicing the appliance must be replaced before operating the heater.
The appliance should be inspected before each use. Frequent cleaning may be required. The control compartments, burner, and circulating air passageways of the appliance must be kept clean, see MAINTENANCE.
DO NOT use this heater if any part has been underwater. 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 ventilation 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, and those at high altitudes – are more affected by carbon monoxide than others.
When the 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 THE HEATER UNATTENDED OR WHERE CHILDREN MAY CAUSE THE HEATER TO TIP OVER. NEVER OPERATE THE HEATER WHILE SLEEPING!

GENERAL INFORMATION:

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.
Note : The heater can be used outdoors, but may experience nuisance shutoffs due to certain wind conditions.
When the heater is cold or at room temperature, it will take a few minutes for the burner tile to turn bright orange. This is normal and the heater is working properly. If the burner tile is visibly flaming, turn the heater off and call a qualified service technician.
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 be discolored. This is also normal and is no reason for concern.
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.
Operating time will be approximately 5 hours on a one 1lb. cylinder. Due to the properties of LP gas, runtimes can be significantly reduced when operating continuously at temperatures below 20ºF.
This heater is equipped with a tip-over safety switch. Nuisance shut-downs may be experienced if the unit is bumped or moved. if this occurs simply relight the heater.
Due to the natural operation of small tanks, condensation may build up on the tank and drip on the surface under the heater. Sometimes this condensation may freeze due to the extreme cold caused when propane vaporizes. This is normal and no reason for alarm.

LIGHTING / OPERATING INSTRUCTIONS

WARNING : Always inspect the propane cylinder and heater propane connections for damage, dirt, and debris before attaching the propane cylinder. Do not use if the head of the cylinder is damaged, punctured or deteriorated.

ALWAYS ATTACH OR DETACH THE CYLINDER OUTDOORS
AWAY FROM FLAMES, AND OTHER IGNITION SOURCES, AND ONLY WHEN THE HEATER IS COOL TO TOUCH. NEVER SMOKE WHEN ATTACHING OR REMOVING PROPANE CYLINDER OR MAKING REMOTE CONNECTIONS!

Use only LP-gas cylinders marked by the U.S. Dept. of Transportation (DOT).
Use only 16.4 oz. (1 lb.) disposable cylinders that mate with the No. 600 valve connection.
The heater and attached cylinder must be in an upright position during operation.
Screw 1 lb. disposable LP-gas supply cylinder clockwise (from bottom) into the portable heater until hand-tight and fit the cylinder into the stand. Do not use thread sealant on this connection.
Check the cylinder connection for leaks with soapy water at the threaded connection under the domed plastic cover where the cylinder screws into the regulator. SEE WARNING! ON PLASTIC COVER.
Depress the “ON” button to light the pilot flame (repeat until the pilot lights) and continue to hold for 30-60 seconds.
After lighting the pilot, release the “ON” button to light the heater.
To shut off the heater, press the “OFF” button.
CAUTION : After turning the heater off, the wire guard will remain hot. Allow to thoroughly cool before storing.
Do not operate, store, or remove cylinders near flammable items or ignition sources.
LP-GAS CYLINDERS MUST BE DISCONNECTED FROM THE HEATER WHEN NOT IN USE!

MAINTENANCE

Always keep the heater area clear and free from combustible materials, gasoline and other flammable vapors and liquids.
Keep the vent areas (slots in the bottom and top of the heater) clear at all times.
Visually inspect the pilot flame and burner periodically during use. The pilot flame should be blue (not yellow) and will extend to the thermocouple. The flame will surround the thermocouple just below the tip, see Figure 2.
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 redorange 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 housing 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. It is necessary to periodically check the burner orifice and burner venturi to make sure that they are clear of things such as insect nests and spider webs that may accumulate over time. A clogged tube can lead to a fire.
CLEANING INSTRUCTIONS:

Allow the heater to thoroughly cool before performing any maintenance.
Remove the disposable 1 lb. propane cylinder from the heater.
Remove the right side plastic service panel (ref.5) by removing the six screws holding it in place.
Inspect the interior of the casing for accumulation of dust, lint, or spider webs. If necessary, clean the interior of the casing assembly with a vacuum cleaner or compressed air (max 30 psi). Do not damage any components within the casing assembly when you are cleaning.
Inspect and clean the main burner (ref. 13) and orifice (ref. 3) by using a vacuum or compressed air (max 30 psi).
Inspect and clean the pilot tube (ref. 14). Insert a doubled-over pipe cleaner into the pilot tube until it bottoms against the pilot orifice (approximately 2”). Rotate the pipe cleaner a couple of times and remove it. Blow out the remaining debris using compressed air.
WARNING : Never use needles, wires, or similar cylindrical objects to clean the pilot to avoid damaging the calibrated ruby that controls the gas flow through the pilot orifice.
Apply compressed air (max 30 psi) into the ceramic tile of the burner assembly and venturi tube (ref. 13) to remove dust, lint, and spider webs.
Reinstall the right-side plastic service panel.

TROUBLESHOOTING INFORMATION

If the Spark electrode does not produce a spark.
CHECK

The spark electrode is broken – replace.
Igniter wire may not be attached to spark electrode.– attach
Igniter wire damaged – replace.
Piezo igniter was defective – replace gas valve assembly.

If the Spark electrode produces a spark but the pilot does not light.
CHECK

No gas to heater – re-install or replace gas cylinder.
The pilot is blocked from spider web or dirt – clean pilot, see MAINTENANCE.

If the Pilot flame does not stay lit when a button is released.
CHECK

The “Pilot/Ignition” button is not held long enough to purge air from the line.
Pilot flame not surrounding thermocouple – clean pilot, see MAINTENANCE.
Pilot Assembly defective – replace.
Tip switch wires disconnected – connect tip switch (check off switch and off switch wiring).

If the Main burner does not ignite.
CHECK

The main burner orifice is blocked – clean burner, see MAINTENANCE.

If the Heater keeps shutting “OFF” during normal operation.
CHECK

The pilot is blocked – clean pilot, see MAINTENANCE.
Provide minimum fresh air opening of 4 square inches (example 2” x 2” opening).
Tip over switch activated from bumping heater. Re-light

PARTS LIST

SEE THE BACK PAGE FOR PARTS ORDERING INFORMATION

Mr. Heater-MH4B-PORTABLE-RADIANT-BUDDY-HEATER-fig.2

ITEM NO.| PART NUMBER| ****

DESCRIPTION

---|---|---
1| 15161| Regulator/Valve Assembly| 1
2| 15151| Orifice| 1
3| 15163| Off Button Wire| 1
4| 15126| Left Housing| 1
5| 15128| Right Service Housing| 1
6| 15122| On Button| 1
7| 15123| Off Button| 1
8| 15165| Off Button Spring| 1
9| 15124| Tank Base| 1
10| 15157| Reflector Panel| 1
1| 15158| Reflector Ring| 1
12| 15162| Wire Guard| 1
13| 15138| Burner Assembly| 1
14| 15155| ODS/Pilot Assembly| 1
15| 15153| Burner Bracket| 1
16| 15145| Off Switch| 1
17| 73403| Tipover Switch| 1
18| 15148| Pilot Fuel Line| 1
19| 15154| Heat Shield| 1

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.

WARNING:
USE ONLY THE 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.

PARTS ORDERING INFORMATION:
PURCHASING : Accessories may be purchased at any Mr. Heater local dealer or directly from the factory
FOR INFORMATION REGARDING SERVICE
VISIT : mrheater.com
Or call Toll-Free 800-251-0001
Our office hours are 8:00 AM – 5:00 PM, EST, Monday through Friday.
Please include the model number, date of purchase, and description of the problem in all communication.

LIMITED WARRANTY

Mr. Heater, Inc. warrants its heaters and accessories to be free from defects in material and workmanship for 1 year from the 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, 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, specifications, accessories, materials, and models.
PRODUCT REGISTRATION: Thank you for your purchase.
Please log in to http://www.egiregistration.com to register your product.

FAQs

How do you ignite and operate the Mr. Heater MH4B?

It typically has a push-button ignition and easy-to-use controls for adjusting heat settings.

Can the Mr. Heater MH4B be used at high altitudes?

Yes, it is suitable for use at high altitudes and can perform well in various environmental conditions.

Does the Mr. Heater MH4B have multiple heat settings?

Yes, it has two heat settings, low and high, to control the level of heat output.

Is the Mr. Heater MH4B easy to carry and transport?

Yes, the MH4B is designed to be lightweight and comes with a built-in handle for easy transportation.

Is the Mr. Heater MH4B suitable for emergency heating during power outages?

Yes, the MH4B is often used as an emergency heating source when electricity is unavailable, thanks to its reliable propane operation and safety features.

Can the Mr. Heater MH4B be used for camping and outdoor activities?

Yes, the MH4B is a popular choice for camping, fishing, and other outdoor activities due to its portability and efficiency.

How long can the Mr. Heater MH4B run on a single propane cylinder?

The runtime depends on the size of the propane cylinder used. On a 1 lb. cylinder, it can run for approximately 3 to 6 hours.

What is the BTU output of the Mr. Heater MH4B?

The MH4B has a maximum output of 4,000 BTUs (British Thermal Units).

Is the Mr. Heater MH4B safe for indoor use?

Yes, the MH4B is designed for safe indoor use, equipped with several safety features like an oxygen depletion sensor (ODS) and a tip-over switch.

What type of fuel does the Mr. Heater MH4B use?

The MH4B operates on propane fuel, typically supplied via a propane cylinder.

What is the heating capacity of the Mr. Heater MH4B?

The MH4B can heat spaces up to 225 square feet.