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Mr. Heater MHVFR20TB NG - User Manual

Mr. Heater MHVFR20TB NG
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MR. HEATER, INC., 4560 W. 160
TH
ST., CLEVELAND, OHIO 44135 · 800-251-0001
WARNING: If the information in this manual is not followed exactly, a re or explosion may result causing
property damage, personal injury, or loss of life.
- Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or any other appliance.
- WHAT TO DO IF YOU SMELL GAS
• Shut off gas supply
• Do not try to light any appliance
• Do not touch an electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the re department.
- Installation and service must be performed by a qualied installer, service agency, or the gas supplier.
WARNING: This is an unvented gas-red heater. It uses air (oxygen) from the room in which it is installed.
Provisions for adequate combustion and ventilation air must be provided. Refer to Fresh Air for Combustion
and Ventilation section on page 4 of this manual.
WARNING: Improper installation, adjustment, alteration, service or maintenance can cause injury or property
damage. Refer to this manual for correct installation and operational procedures. For assistance or additional
information consult a qualied installer, service agency, or gas supplier.
02/14 70808 2015 JM
Installer: Leave this manual with the appliance. Consumer: Retain this manual for future reference.
UNVENTED NATURAL GAS FIRED ROOM HEATER
Blue Flame Heaters
MHVFB20TB NG
(BLOWER INCLUDED)
MHVFB20T NG
(BLOWER SOLD SEPARATELY)
MHVFB30TB NG
(BLOWER INCLUDED)
MHVFB30T NG
(BLOWER SOLD SEPARATELY)
Plaque Heaters
MHVFR20TB NG
(BLOWER INCLUDED)
MHVFR20T NG
(BLOWER SOLD SEPARATELY)
MHVFR30TB NG
(BLOWER INCLUDED)
MHVFR30T NG
(BLOWER SOLD SEPARATELY)
OPERATING INSTRUCTIONS
AND OWNER’S MANUAL
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.

Table of Contents

Other manuals for Mr. Heater MHVFR20TB NG

Preview: Operating Instructions And Owner's Manual
Operating Instructions And Owner's Manual16 pages

Questions and Answers

  • D
    Dana VelezAug 20, 2025
    What to do if Mr. Heater MHVFR20TB NG shuts off in use?
    • J
      Jessica KingAug 20, 2025
      If your Mr. Heater Gas Heater shuts off during use and the ODS (Oxygen Depletion Sensor) operates, it could be due to a few reasons. Primarily, there might not be enough fresh air available, so try opening a window or door for ventilation. Alternatively, low line pressure could be the cause, in which case you should contact your local gas company. Lastly, the ODS/pilot might be partially clogged; consider cleaning it.
  • A
    Amanda McdonaldAug 22, 2025
    Why does the pilot light go out on my Mr. Heater MHVFR20TB NG?
    • V
      Vanessa RichmondAug 22, 2025
      If the ODS/pilot lights but the flame goes out when you release the control knob on your Mr. Heater Gas Heater, there could be several reasons. Ensure the gas supply is turned on and the equipment shutoff valve is open. Make sure to fully press in the control knob while pressing the ignition button. If there's air in the gas line from a recent installation, continue holding down the control knob and repeat the ignition operation until the air is removed. The ODS/pilot might also be clogged and require cleaning. A gas regulator setting might not be correct, and require replacement. Ensure the control knob is in the pilot position.
  • A
    alexandersimonAug 25, 2025
    What to do if Mr. Heater MHVFR20TB NG Gas Heater spark but no ignition?
    • D
      Daniel HarmonAug 25, 2025
      If, when you press the ignitor button on your Mr. Heater Gas Heater, there is a spark at the ODS/pilot but no ignition, ensure the control knob is fully pressed in. Also, after the ODS/pilot lights, keep the control knob pressed in for 30 seconds. Make sure the equipment shutoff valve is fully open. Check if the thermocouple is damaged, and hand tighten the thermocouple nut until snug, then tighten it an additional 1/4 turn.
  • M
    Marisa WalkerAug 27, 2025
    Why won't the burner light on my Mr. Heater MHVFR20TB NG Gas Heater?
    • M
      Michael MccormickAug 27, 2025
      If your Mr. Heater Gas Heater burner does not light after the ODS/pilot is lit, the burner orifice may be clogged; consider cleaning or replacing it. Also, the burner orifice diameter might be too small, requiring replacement. Finally, the inlet gas pressure could be too low, in which case you should contact your local gas company.
  • E
    Elizabeth CookAug 28, 2025
    Why does my Mr. Heater Gas Heater smell like gas when off?
    • J
      joshua39Aug 28, 2025
      If you notice a gas odor even when the control knob of your Mr. Heater Gas Heater is in the OFF position, it's likely due to a gas leak. Locate and correct all leaks. Another potential cause is a defective control valve, which would need replacement.
  • J
    josephallisonAug 29, 2025
    Why does my Mr. Heater MHVFR20TB NG Gas Heater smell like gas when burning?
    • P
      Patricia PowellAug 30, 2025
      If your Mr. Heater Gas Heater has a gas odor during combustion, it could be due to foreign matter between the control valve and burner; in this case, take apart the gas tubing and remove any foreign matter. Another potential cause is a gas leak, so locate and correct any leaks.
  • D
    Diane YoungSep 1, 2025
    Why does my Mr. Heater MHVFR20TB NG smell?
    • J
      jessicacooleySep 1, 2025
      If your Mr. Heater Gas Heater produces unwanted odors, it might be burning vapors from paint, hair spray, glues, etc. Ventilate the room and stop using odor-causing products while the heater is running. Alternatively, there could be a gas leak; locate and correct all leaks.
  • E
    ericksoncourtneySep 2, 2025
    Why is there a delay when my Mr. Heater Gas Heater burner ignites?
    • J
      Jason GeorgeSep 2, 2025
      If your Mr. Heater Gas Heater experiences delayed ignition of the burner, the manifold pressure might be too low; contact your local gas company. Also, the burner orifice could be clogged; try cleaning or replacing it.
  • J
    Joseph BoyleSep 4, 2025
    Why is my Mr. Heater MHVFR20TB NG Gas Heater burner backfiring?
    • S
      Sherry ParsonsSep 4, 2025
      If your Mr. Heater Gas Heater burner backfires during operation, the burner orifice might be clogged or damaged; clean or replace it. The burner itself could also be damaged, requiring replacement. A defective gas regulator could also cause this issue, and should be replaced.
  • P
    phamiltonSep 6, 2025
    Why is my Mr. Heater MHVFR20TB NG Gas Heater whistling?
    • G
      griveraSep 6, 2025
      If your Mr. Heater Gas Heater produces a whistling noise when the burner is lit, try turning the control knob to the LO position and let it warm up for a minute, especially if the burner is cold. The noise could also be due to air in the gas line; operate the burner until the air is removed from the line, and have the gas line checked by your local gas company. Blocked air passageways on the heater could also be the cause; ensure you observe minimum installation clearances.

Summary

SPECIFICATIONS

PRECAUTIONS

IGNITION SYSTEM; BATTERY INSTALLATION

THERMOSTATIC CONTROL

BLOWER FAN CONTROL SWITCH OPERATION

LOCAL CODES

UNPACKING

FRESH AIR FOR COMBUSTION AND VENTILATION

ESTABLISHING ADEQUATE VENTILATION

Guidance on ensuring sufficient air for combustion and ventilation in various construction types.

DETERMINING THE TYPE OF HEATER LOCATION SPACE

VENTILATION AIR

Ventilation from Inside Building

Details on providing fresh air from adjoining rooms using openings or doors.

INSTALLATION

LOCATING HEATER

Instructions for choosing the optimal and safe placement of the heater.

FASTENING HEATER TO WALL

Attaching Mounting Bracket to Wall

Steps for securely attaching the wall mounting bracket to studs or anchors.

FLOOR MOUNTING AWAY FROM WALL

Installing Support Feet

Instructions for attaching the support feet for floor-based heater placement.

CONNECTING TO GAS SUPPLY

PRESSURE TESTING GAS SUPPLY PIPING SYSTEM

ELECTRICAL WIRING DIAGRAM

OPERATING YOUR HEATER

LIGHTING INSTRUCTIONS

Step-by-step guide for safely lighting the heater's pilot and main burner.

THERMOSTAT CONTROL OPERATION

TO TURN OFF GAS TO APPLIANCE

SHUTTING OFF HEATER

Procedure for completely turning off the heater and its gas supply.

SHUTTING OFF BURNER ONLY (PILOT STAYS LIT)

Procedure to turn off the burner while keeping the pilot light active.

INSPECTING BURNER

PILOT FLAME PATTERN

Guidance on checking the pilot flame for correct position and condition.

CLEANING AND MAINTENANCE

CLEANING ODS;PILOT AND BURNER

Instructions for cleaning the Oxygen Depletion Sensor, pilot, and burner components.

CLEANING BURNER PILOT AIR HOLE INLET

Procedure for cleaning the air inlet hole on the pilot assembly for optimal performance.

CLEANING HEATER CABINET

Instructions for cleaning the exterior cabinet and air passageways.

TROUBLESHOOTING

Parts List

REPLACEMENT PARTS ORDERING INFORMATION

FOR INFORMATION REGARDING SERVICE

LIMITED WARRANTY

PRODUCT REGISTRATION

Mr. Heater MHVFR20TB NG Specifications

General IconGeneral
BrandMr. Heater
ModelMHVFR20TB NG
CategoryGas Heater
LanguageEnglish

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