MrHeater MHVFDF20BFT Assembly instructions

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.
www.mrheater.com 800-251-0001
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
WARNING: Do not attempt to access
or change the setting of the fuel selection
means.
Access to and adjustment of the fuel
selection means must only be performed by
a qualified service person when connecting
this appliance to a specified fuel supply at
the time of installation.
Change of the selector setting to other
than the fuel type specified at the time of
installation could damage this appliance and
render it inoperable.
The installer shall replace the access cover
before completing the installation and
operating this appliance.
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
Model # MHVFDF20RTT MHVFDF20BFT
MHVFDF30RTT MHVFDF30BFT
UNIVERSAL
UNVENTED
ROOM 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.
-WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any 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 fire department.
-Installation and service must be performed by a qualified installer, service agency or the gas supplier.
This is an unvented gas-fired heater. It uses air (oxygen) from the room in which it is in-
stalled. 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.
This appliance may be installed in an aftermarket permanently manufactured (mobile) home,
where not prohibited by local codes. This appliance is only for use with propane or natural gas.
This appliance is equipped with a simple means to switch between propane and natural gas.
Field conversion by any other means including the use of a kit is not permitted.
MHVFDF20RTT
MHVFDF30RTT
MHVFDF20BFT
MHVFDF30BFT
Plaque Heaters Blue Flame Heaters

2
Mr. Heater | Universal Unvented Room Heater Installation Instructions and Owner’s Manual
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
WARNING:
Do not use a blower insert,
heat exchanger insert or other
accessory not approved for use
with this heater.
Due to high temperatures,
heater should be kept out of
traffic and away from furniture
and draperies.
Do not place clothing or other
flammable material on or near
the appliance.
Children and adults should be
alerted to the hazard of high
surface temperature and should
stay away to avoid burns or
clothing ignition.
Young children should be
carefully supervised when they
are in the same room with
heater.
A barrier designed to reduce
the risk of burns from the
hot viewing glass is provided
with this appliance and shall
be installed for the protection
of children and other at-risk
individuals.
If the barrier becomes damaged,
the barrier shall be replaced with
the manufacturer’s barrier for
this appliance.
Any safety screen or guard
removed for servicing an
appliance must be replaced prior
to operating the heater.
Installation and repair should
be done by a qualified service
person. The appliance should be
inspected before use and at least
annually by a professional service
person. More frequent cleaning
may be required due to excessive
lint from carpeting, bedding
material, etc. It is imperative that
control compartments, burners,
and circulating air passageways
of the appliance be kept clean.
DANGER:
WARNING:
THIS PRODUCT CAN EXPOSE
YOU TO CHEMICALS INCLUDING
LEAD AND LEAD COMPOUNDS,
WHICH ARE KNOWN TO
THE STATE OF CALIFORNIA
TO CAUSE CANCER AND
BIRTH DEFECTS OR OTHER
REPRODUCTIVE HARM. FOR
MORE INFORMATION GO TO
WWW.P65WARNINGS.CA.GOV
WARNINGS
WARNING: FIRE,
EXPLOSION, AND
ASPHYXIATION HAZARD
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 qualified installer, service
agency, or gas supplier.
Read and follow instructions
and precautions in User’s
Information Manual provided
with this heater.
HOT GLASS WILL CAUSE BURNS.
DO NOT TOUCH GLASS UNTIL
COOLED.
NEVER ALLOW CHILDREN TO
TOUCH GLASS.
A barrier designed to reduce the risk
of burns from the hot viewing glass
is provided with this appliance and
shall be installed for the protection of
children and other at-risk individuals.
CAUTION: Never connect heater directly to the Propane supply. This heater requires an external
regulator (not supplied). Install the external regulator between the heater and Propane/LP supply.
The installer must supply an external regulator. The external regulator will reduce the incoming gas pressure
to between 11 and 14 inches of water. If you do not reduce incoming gas pressure heater regulator
damage could occur. Install external regulator with the vent pointing down. Pointing the vent down
protects it from freezing rain or sleet.
WARNING:
Fuels used in liquefied propane
gas appliances, and the products
of combustion of such fuel,
can expose you to chemicals
including benzene, which is
known to the state of California
to cause cancer and cause birth
defects or other reproductive
harm, for more information go
to www.P65Warnings.ca.gov

3Installation Instructions and Owner’s Manual
Mr. Heater | Universal Unvented Room Heater
Specifications
MODEL MHVFDF20RTT MHVFDF30RTT MHVFDF20BFT MHVFDF30BFT
Rate (Available) 20,000 BTU/Hr (NG) 30,000 BTU/Hr 20,000 BTU/Hr 30,000 BTU/Hr
18,000 BTU/Hr (LP)
Type of Gas Propane/LP or NG Only Propane/LP or NG
Only
Propane/LP or NG Only PropaneLP or NG Only
Ignition Battery Igniter (1-AAA) Battery Igniter (1-AAA) Battery Igniter (1-AAA) Battery Igniter (1-AAA)
Propane
Manifold Pressure 10 inches of Water 10 inches of Water 10 inches of Water 10 inches of Water
Inlet Gas Pressure
(Min.)
11 inches of Water 11 inches of Water 11 inches of Water 11 inches of Water
Inlet Gas Pressure
(Max.)
14 inches of Water 14 inches of Water 14 inches of Water 14 inches of Water
Natural
Gas
Manifold Pressure 4.5 inches of Water 4.5 inches of Water 4.5 inches of Water 4.5 inches of Water
Inlet Gas Pressure
(Min.)
7 inches of Water 7 inches of Water 7 inches of Water 7 inches of Water
Inlet Gas Pressure
(Max.)
14 inches of Water 14 inches of Water 14 inches of Water 14 inches of Water
Electrical Rating/Blower 120V, 60Hz, 1Ø 120V, 60Hz, 1Ø 120V, 60Hz, 1Ø 120V, 60Hz, 1Ø
Thermostatic Control Yes Yes Yes Yes
Clearances
Top 36” (91.4 cm) 36” (91.4 cm) 36” (91.4 cm) 36” (91.4 cm)
Sides 10” (25.4 cm) 10” (25.4 cm) 10” (25.4 cm) 10” (25.4 cm)
Floor (min. to top of
carpet)
3” (7.6 cm) 3” (7.6 cm) 3” (7.6 cm) 3” (7.6 cm)
Fabric / flammable objects 36” (91.4 cm) 36” (91.4 cm) 36” (91.4 cm) 36” (91.4 cm)
CONTENTS
2 Warnings
3 Specifications
3 Precautions
4 Installation
9 Operation
Lighting
Shutdown
11 Maintenance
12 Troubleshooting
16 Parts List
20 Ordering Parts/Warranty
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
PRECAUTIONS
PRECAUTIONS:
1. This heater may not be installed in
a bedroom, bathroom or any place
where a strong wind would shut
down the appliance.
2. This heater needs outside ventilation
air to run properly. The Oxygen
Depletion Sensor (ODS) safety shutoff
system shuts down the heater if not
enough fresh air is available. See
Fresh Air for Combustion and
Ventilation, page 4.
3. Keep all air openings in heater clear,
free of debris or any blockage. This
will ensure that enough air for proper
combustion enters the heater.
4. If heater shuts off, do not relight
until you provide fresh, outside air. If
heater keeps shutting off, it requires
servicing.
5. Turn off and let cool before servicing.
Only a qualified service person should
service and repair heater.
6. Do not run heater:
• Where flammable liquids or vapors are
used or stored
• During dusty conditions.
7. Before using furniture polish, wax,
carpet cleaner or similar products, turn
heater off. If heated the vapors from
these products may create a white
powder residue within burner box or
on adjacent walls or furniture.
8. Do not use heater if any part has
been underwater. Immediately call a
qualified service technician to inspect
the room heater and to replace any
part of the control system and any gas
control which has been underwater.
9. Operating heater above elevations
of 4,500 feet could cause pilot/ODS
to shutdown heater.
10.Always run heater with control knob
in a locked position. Never set control
knob between locked positions. Poor
combustion and higher levels of
carbon monoxide may result if control
knob is left between locked positions.
**Operating heater above elevations of 4,500 feet could cause
pilot/ODS to shutdown heater.**
SOCIAL MEDIA
In order to provide the best service possible Mr. Heater is now giving you more
ways to get in touch with us:
WEBSITE: Mr. Heater’s full line of product are now at: www.mrheater.com
FACEBOOK: Find us on Facebook TWITTER: Find us on twitter
YouTube: There are now informational videos on Youtube.
DANGER: Carbon monoxide
poisoning may lead to death.

4
Mr. Heater | Universal Unvented Room Heater Installation Instructions and Owner’s Manual
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
Control
Knob
Igniter
Button
Heater
Cabinet
Front Panel
Grill
Burners
Figure 1
WARNING: This heater shall not
be installed in a confined space or
unusually tight construction unless
provisions are provided for adequate
combustion and ventilation air. Read the
FRESH AIR FOR COMBUSTION AND
VENTILATION section to insure proper
fresh air for this and other fuel-burning
appliances in your home.
WARNING: This heater shall not be
installed in a room or space unless the
required volume of indoor combustion
air is provided by the method described
in the National Fuel Gas Code, ANSI
Z223.1/NFPA 54, the International Fuel
Gas Code, or applicable local codes.
Carbon Monoxide Poisoning:
Early signs of carbon monoxide poisoning
resemble the flu, with headaches,
dizziness, or nausea. If you have these
signs, the heater may not be working
properly. Get fresh air at once! Have
heater serviced. Some people are more
affected by carbon monoxide than others.
These include pregnant women, persons
with heart or lung disease or anemia,
those under the influence of alcohol, and
those at high altitudes.
Natural and Propane/LP Gas:
Natural and Propane/LP gases are
odorless. An odor making agent is added
to these gases. The odor helps you detect
a gas leak. However, the odor added to
the gas can fade. Gas may be present
even though no odor exists. Make certain
you read and understand all warnings.
Keep this manual for reference.
It is your guide to safe and proper
operation of this heater.
Safety Device
This heater has a pilot with an Oxygen
Depletion Sensor (ODS) safety shut off
system. The ODS/pilot shuts off the
heater if there is not enough fresh air.
Ignition System/ Battery
Installation
The heater is equipped with an electronic
manual ignitor. This system requires no
matches, batteries, or other source to
light heater but does require one AAA
battery to operate igniter.
To install or replace battery, unscrew
the igniter cap (red button), insert
battery positive (+) terminal up and
replace cap. (AAA Battery included).
Thermostatic Control
These heaters have a control valve with
a thermostat sensing bulb. This results
in the greatest heater comfort and may
result in lower fuel bills.
Optional Blower Kit
(Sold Separately)
On models not equipped with a blower,
an optional blower kit (F299201) is
available. Please refer to the instruction
sheet that accompanies the blower kit for
steps on how to remove knock-out plate
and install.
Local Codes
Install and use heater with care.
Installation must conform to local codes
or in the absences of local codes, use the
latest edition of National Fuel Gas Code,
ANSI Z223.1/NFPA 54.
Unpacking
1. Remove heater from carton.
2. Remove all protective packaging
applied to heater for shipment.
3. Check heater for any shipping
damage. If heater is damaged,
promptly inform dealer where you
bought heater.
FRESH AIR FOR COMBUSTION
AND VENTILATION
Establishing Adequate
Ventilation
The following are excerpts from National
Fuel Gas Code, NFPA 54/ ANSI Z223.1,
Section 5.3, Air for Combustion and
Ventilation. All spaces in homes fall into
one of the three following ventilation
classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
This heater must not be installed in
a confined space or unusually tight
construction unless provisions are
provided for adequate combustion and
ventilation air. The information on pages
4 and 5 will help you classify your space
and provide adequate ventilation.
Unusually Tight Construction
If your home meets all of the three
following criteria, you must provide
additional fresh air. See Ventilation from
Outdoors, page 5.
Unusually tight construction is defined as
construction where:
1. Walls and ceilings exposed to the
outside atmosphere have a continuous
water vapor retarder with a rating of
one perm (6 x 10-11 kg per pa-sec-m2)
or less with openings gasketed or
sealed and
2. Weather stripping has been added on
operable windows and doors, and
3. Caulking or sealants are applied to
areas such as joints around windows
and door frames, between wall-
ceiling joints, between wall panels, at
penetrations for plumbing, electrical,
and gas lines, and at other openings.
If you home does not meet all of the
three criteria above, see Determining the
Type of Heater Location Space, below.
Product Features
INSTALLATION

5Installation Instructions and Owner’s Manual
Mr. Heater | Universal Unvented Room Heater
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
Figure 2
Figure 3
INSTALLATION
WARNING: Rework worksheet,
adding the space of the adjoining
unconfined space. The combined space
must have enough fresh air to supply all
appliance in both spaces.
*IMPORTANT: Do not provide
openings for inlet or outlet into attic. If
attic has a thermostat-controlled power
vent, heated air entering the attic will
activate the power vent.
IMPORTANT: Vent-free heaters
add moisture to the air. Although
this is beneficial, installing heater in
rooms without enough ventilation air
may cause mildew to form from too
much moisture. See Fresh Air for
Combustion and Ventilation, pages
4 through 5.
WARNING: Any change to this
heater or its controls can be dangerous.
WARNING: A qualified service
person must install heater. Follow all
local codes.
Confined Space and Unconfined
Space
The National Fuel Gas Code, NFPA
54/ ANSI Z223.1 defines a confined
space as a space whose volume is less
than 50 cubic feet per 1,000 Btu per
hour (4.8 m3per kW) of the aggregate
input rating of all appliances installed in
that space, and an unconfined space as
a space whose volume is not less than
50 cubic feet per 1,000 Btu per hour
(4.8 m3per kW) of the aggregate input
rating of all appliances installed in that
space. Rooms communicating directly
with the space in which the appliances
are installed*, through openings not
furnished with doors, are considered a
part of the unconfined space.
*Adjoining rooms are communication
only if there are doorless passageways or
ventilation grills between them.
Determining The Type Of
Heater Location Space
Use this method to determine if you have
a confined or unconfined space.
Note: The space includes the room in
which you install heater plus any adjoining
rooms with doorless passageways or
ventilation grills between the rooms.
1. Find the volume of the space by
multiplying room length x width x
height.
Example: Space size 18ft (length) x 18ft.
(width) x 8ft. (height) = 2592
If additional ventilation to adjoining room
is supplied with grills or openings, add
the volume of these rooms to the total
volume of the space.
2. Divide the space volume by 50 cubic
feet to determine the maximum Btu/
hr the space can support.
Example: 2592 cu.ft. (volume of space)
/ 50 cu.ft. = 51.8 or 51,800 (maximum
Btu/hr the space can support)
3. Add the Btu/hr of all the fuel-
burning appliances in the space such
as, Vent–free heater, Gas water
heater, Gas furnace, Vented gas
heater, Gas fireplace logs, and other
gas appliances*
*Do not include direct-vent gas
appliances. Direct-vent draws
combustion air from the outdoors
and vents to the outdoors.
Ventilated
Attic
To Attic
To Crawl
Space
Inlet Air
Ventilation Crawl Space
Ventilation Air
Outlet Air
Ventilation Grills into Adjoining
Room-Option 2
Or remove
door into
Adjoining
Room-
Option 3
Ventilation
Grills into
Adjoining
Room-
Option 1
(30.5 cm) 12”
12” (30.5 cm)
Example:
Gas water heater 40,000 Btu/
hr
Vent Free Heater + 20,000 Btu/
hr
Total =60,000 Btu/hr
4. Compare the maximum Btu/hr the
space can support with the actual
amount of Btu/hr used.
Example: 51,800 Btu/hr (maximum
Btu/hr the space can support)
60,000Btu/hr (Actual
amount of Btu/hr used)
The space in the above example is a
confined space because the actual
Btu/hr used is more than the maximum
Btu/hr the space can support.
You must provide additional fresh
air. Your options are as follows:
a. Rework worksheet, and the space
of an adjoining room. If the extra
space provides an unconfined space,
remove door to adjoining room or add
ventilation grills between the rooms.
See Ventilation From Inside Building
(Fig. 2)
b. Vent room directly to the outdoors.
See Ventilation From Outdoors (Fig.
3).
c. Install a lower Btu/hr heater if lower
Btu/hr size makes room unconfined.
If actual Btu/hr used is less than
the maximum Btu/hr the space can
support, the space is an unconfined
space. You will need no additional
fresh air ventilation.
Ventilation Air
Ventilation from Inside Building
This fresh air would come from
an adjoining unconfined space.
When ventilation to an adjoining
unconfined space, you must provide
two permanent openings: one within
12” of the ceiling and one within 12”
of the floor on the wall connecting
the two spaces (see options 1 & 2 of
figure 2). You can also remove door
into adjoining room (see option 3, Fig
2). Follow the National Fuel Gas Code
NFPA 54/ ANSI Z223.1, Section 5.3,
Air for Combustion and Ventilation
for required size of ventilation grills or
ducts.

6
Mr. Heater | Universal Unvented Room Heater Installation Instructions and Owner’s Manual
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
CAUTION: If you install the heater
in a home garage:
• Heater pilot and burner must be
at least 18 inches above floor.
• Locate heater where moving
vehicle will not hit it.
CAUTION: This heater creates
warm air currents. These currents
move heat to wall surfaces next to
heater. Installing heater next to vinyl
or cloth wall covering or operating
heater where impurities (such as
tobacco smoke, aromatic candles,
cleaning fluids, oil or kerosene lamps,
etc.) are present in the air may discolor
walls.
Ventilation from Outdoors
If necessary provide extra fresh air
by using ventilation grills or ducts.
Connect these items directly to the
outdoors or spaces open to the
outdoors. These include attics* and
crawl spaces. Follow the National Fuel
Gas Code NFPA 54/ ANSI Z223.1,
Section 5.3, Air for Combustion
and Ventilation for required size of
ventilation grills or ducts.
INSTALLATION
NOTICE: This heater is intended for
the use as supplemental heat. Use
this heater along with your primary
heating system. Do not install this
heater as your primary heat source.
If you have a central heating system,
you may run system’s circulating
blower while using heater. This will
help circulate the heat throughout the
house. In the event of a power outage,
you can use this heater as your primary
heat source for the duration of the
outage.
This Installation Requires:
Before installing heater, make sure you
have the items listed below:
• Piping (check local codes)
• Sealant (resistant to Natural and
Propane/LP gases)
• Equipment shutoff valve*
• Ground joint union
• Test gauge connection*
• Sediment trap
• Tee joint
• Pipe wrench
*A CSA/AGA certified equipment
shutoff valve with 1/8” NPT tap is an
acceptable alternative to test gauge
connection. Purchase a CSA/AGA
certified equipment shutoff valve from
your dealer.
Locating Heater
This heater is designed to be mounted
on the wall. The heater can also be
located on a non-combustible floor,
away from a wall by using the floor
mounting stands included with the
heater. If installed on combustible
flooring such as carpeting, tile or other
combustible material other than wood
flooring, the heater must be placed on
a metal or wood panel extending the
full width and depth of the appliance.
For convenience and efficiency, install
the heater:
• Where there is easy access for
operation, inspection, and service.
• In the coldest part of the room.
• If planning to use fan, locate heater
near an electrical outlet.
Fastening Heater to Wall
Mounting Bracket
The mounting bracket in located on
the back panel of heater. See Figure 5.
It has been taped there for shipping.
Remove mounting bracket from back
panel.
Removing Front Panel of Heater
1. Remove (4) screws total there are (2)
screws on either side of the heater.
See Figure 6.
2. Pull the front panel and back panel
apart.
Attaching Mounting Bracket to Wall
Use holes on each end of mounting
bracket to attach bracket to wall.
These holes are 16 inches apart. Attach
mounting bracket to wall in one of two
following ways.
1. Attach to wall studs
2. Attach to wall anchor
Decide which way best suits your
needs. Either method will provide a
secure hold for the mounting bracket.
Figure 4
Figure 5
Figure 6
Right
Side
Left
Side
Floor
10” (25.4 cm)
from sides
3” (7.62 cm) min. to top surface of carpet,
tile, or other combustible material
36” (91.4 cm)
min. from ceiling
(2)
Screws
(2)
Screws
Mounting
Bracket
WARNING: Never install the heater:
• In a bedroom or bathroom
(MHVFDF20RTT, MHVFDF30RTT,
MHVFDF20BFT, MHVFDF30BFT)
• In a recreational vehicle.
• Where curtains, furniture, clothing,
or other flammable objects are less
than 36 inches from the front, top,
or sides of the heater.
• As a fireplace insert
• In high-traffic areas
• In windy or drafty areas
WARNING: Heater must be
mounted to maintain the minimum
clearances shown in Figure 4. If possible,
provide greater clearances from the
floor, ceiling, and joining walls.
INSTALLATION

7Installation Instructions and Owner’s Manual
Mr. Heater | Universal Unvented Room Heater
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
WARNING: Maintain minimum
clearances shown in Figure 7. If you can,
provide greater clearances from the floor
and joining wall.
Figure 9
Figure 8
Figure 10
Figure 11
Figure 7
Horizontal
Slots
Mounting
Bracket
mounted
to wall
Mark mounting hole locations and drill
holes where indicated. Allow for minimum
clearances.
See clearance
specs on Pg. 3
Adjoining Wall
16” (Lg)
12-9/64” (Sm)
18” Min.
Attaching to Wall Stud
This way is the best providing the
strongest mounting in wood frame
houses.
For attaching mounting bracket to wall
studs:
1. Drill holes at marked locations using
9/64” drill bit.
2. Place mounting bracket onto wall.
Line up holes on each end of bracket
with hole drilled in wall.
3. Insert mounting screws through
bracket and into wall studs.
4. Tighten screws until mounting bracket
is firmly fastened to wall studs.
Attaching to Wall Anchor
This way allows you to attach
mounting bracket to hollow walls (wall
areas between studs) or to solid walls
(concrete or masonry).
1. Tape mounting bracket to wall where
heater will be located. Make sure
mounting bracket is level. For wall
stud mounting locate one end of the
mounting bracket over a wall stud.
2. Mark screw locations on wall.
See figure 7.
3. Remove tape and mount bracket to
wall.
Note: Wall anchors, mounting screws,
and spacer are in hardware package.
The hardware package is provided with
heater.
4. Drill holes at marked locations using
5/16” drill bit. For solid walls (concrete
or masonry), drill at least 1” deep.
5. Fold wall anchor as shown in Figure 8
below.
6. Insert wall anchor (wings first) into
hole. Tap anchor flush to wall.
7. For thin walls (1/2” or less) insert red
key into wall anchor.
8. Place mounting bracket onto wall.
Line up holes on each end of bracket
with wall anchors.
9. Insert mounting screws through
bracket and into wall anchors.
10.Tighten screws until mounting bracket
is firmly fastened to wall.
Placing Heater on Mounting Bracket
1. Locate two horizontal slots on back
pane of heater. See Figure 9.
2. Place heater onto mounting bracket.
Slide horizontal slots onto stand-out
tabs on mounting bracket.
Screw Hole
Screw Hole
Installing Bottom Mounting Screws
1. Locate two bottom mounting holes.
These holes are near bottom on back
panel of heater. See Figure 10.
2. Mark screws locations on wall.
3. Remove heater from mounting
bracket.
4. If installing bottom mounting screw
into hollow or solid wall, install wall
anchors. Follow steps 1 through 4
under Attaching to Wall using Anchor.
If installing bottom mounting screw
into wall stud, drill holes at marked
locations using 9/64” drill bit.
5. Re-place heater onto mounting
bracket.
6. Place spacers between bottom
mounting holes and wall anchor or
drilled hole.
7. Hold spacer in place with one hand.
With the other hand, insert mounting
screw through bottom mounting
hole and spacer. Place tip of screw in
opening of wall anchor or drilled hole.
8. Tighten both screws until heater is
firmly secured to wall. Do not over
tighten.
Note: Do not re-place front panel at
this time.
9. Replace front panel after making gas
connections and checking for leaks.
Floor Mounting Away From Wall
Installing Support Feet (See Figure 11):
1. Lay heater onto table on its back with
bottom edge overhanging table edge.
2. Securely attach feet to bottom of
heater using 2 – self-tapping screws
each.
Note: Feet should have long end going
out the front of heater, and the edge
coinciding with side of heater. If feet
overhang side of the heater, switch leg
location.
3. Place heater on non-combustible
surface (see Locating Heater, page
6) before proceeding with gas
connection. If this will be a permanent
location, heater may be locked into
position using anchoring holes in
mounting feet.
Note: Use of floor mounting feet will
require you to use a 3/8 NPT street
elbow to make gas connection.
INSTALLATION

8
Mr. Heater | Universal Unvented Room Heater Installation Instructions and Owner’s Manual
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
Connecting to Gas Supply
DUAL FUEL CAPABILITY
This appliance can be used with
propane or natural gas. The factory
has set the heater up for propane
operation by default. If using propane,
remove the plug from the Propane/LP
regulator and do not make any further
adjustments. If converting for use with
Natural Gas See FUEL CONVERSION
INSTRUCTIONS on Page 11 before
proceeding.
Natural Gas
CAUTION: Never connect heater
to private (non-utility) gas well. This gas
is commonly known as well-head gas.
IMPORTANT: Check your gas line
pressure before connecting heater to
gas line. Gas line pressure must be no
greater than 10.5 inches of water. If gas
line pressure is higher, heater regulator
damage could occur.
Propane/LP
CAUTION: Never connect heater
directly to the Propane supply. This
heater requires an external regulator
(not supplied). Install the external
regulator between the heater and
Propane/LP supply.
The installer must supply an
external regulator. The external
regulator will reduce the incoming
gas pressure to between 11 and
14 inches of water. If you do not
reduce incoming gas pressure
heater regulator damage could
occur. Install external regulator with
the vent pointing down. Pointing
the vent down protects it from
freezing rain or sleet.
Installation must include an equipment
shutoff valve, union and plugged 1/8”
NPT tap. Locate NPT tap within reach
of test gauge hookup. NPT tap must be
upstream from heater. See Figure 12.
*A CSA/AGA certified equipment
shutoff valve with 1/8” NPT tap is an
acceptable alternative to test gauge
connection. Purchase the CSA/AGA
certified equipment shutoff valve from
your dealer.
INSTALLATION
WARNING: A qualified service
person must connect heater to gas
supply. Follow all local codes.
WARNING: This appliance requires
a 3/8” NPT (National Pipe Thread) inlet
connection to the pressure regulator.
Use of floor mounting feet will require
you to use a 3/8 NPT street elbow to
make gas connection.
CAUTION: Two gas line installations
at the same time are prohibited. The
access plate to the switching means
shall not be opened while the heater is
in operation.
CAUTION: Use only new black iron
or steel pipe. Internally-tinned copper
tubing may be used in certain areas.
Check your local codes. Use pipe
of large enough diameter to allow
proper gas volume to heater. If pipe
is too small, undue loss of pressure
will occur.
CAUTION: Use pipe joint sealant
that is resistant to Propane/LP and/or
Natural Gas depending on fuel used.
Figure 12
Nipple
Tee Joint
Cap
Shutoff Valve
HEATER CABINET
Nipple
Nipple
Tee Joint
Ground Joint Union
3/8” NPT Pipe Nipple
Pressure
Regulator
Test Gauge
Connection
1/8” NPT Plug Tap
Reducer Bushing
to 1/8” NPT
Nipple
Sediment
Trap
3” minimum
Regulated NG Line
(7.5”W.C to 14”WC Pressure)
OR
Regulated LP (Propane) Tank
(11”W.C to 14”WC Pressure)
IMPORTANT: Install an equipment
shutoff valve in an accessible location.
The equipment shutoff valve is for
turning on or shutting off the gas to
the appliance.
Apply pipe joint sealant lightly to male
threads. This will prevent excess sealant
from going into pipe. Excess sealant in
pipe could result in clogged heater fuel
train. Sealant will also help reduce the
chance of cross threading.
Install sediment trap in supply line as
shown in Figure 12. Locate sediment
trap where it is within reach for
cleaning. A sediment trap traps
moisture and contaminants. This
keeps them from going into heater.
If sediment trap is not installed or is
installed improperly, heater may not
run correctly.
IMPORTANT: Hold pressure regulator
with wrench when connecting it to gas
piping and/or fittings.

9Installation Instructions and Owner’s Manual
Mr. Heater | Universal Unvented Room Heater
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
WARNING: Test all gas piping and
connections for leaks after installing or
servicing. Correct all leaks at once.
WARNING: Never use an open flame
to check for a gas leak. Apply a mixture
of liquid soap and water to all joints.
Bubbles forming show a leak. Correct
all leaks at once.
OPERATION
PRESSURE TESTING GAS SUPPLY
PIPING SYSTEM
High Pressure
Test pressure in Excess of ½ psig
(3.5kPa)
1. The appliance and its appliance main
gas valve must be disconnected from
the gas supply piping system during
any pressure testing of that system at
test pressures in excess of ½ psi (3.5
kPa). The appliance must be isolated
from the gas supply piping system by
closing its equipment shutoff valve
during any pressure testing of the gas
supply piping system at test pressures
equal to or less than ½ psi (3.5 kPa).
2. Cap off open end of gas pipe
where equipment shutoff valve was
connected.
3. Pressurize supply piping system
by either using compressed air or
opening main gas valve on or near gas
meter.
4. Check all connections and joints in gas
supply piping system. Apply mixture
of liquid soap and water to gas joints.
Bubbles forming show a leak.
5. Correct all leaks at once.
6. Depressurize and relieve pressure in
supply piping system.
7. Reconnect heater and equipment
shutoff valve to gas supply.
8. Reconnected fittings must be checked
for leaks in next section.
Low Pressure
Test Pressure Equal To or Less Than ½
psig (3.5 kPa)
1. Close equipment shutoff valve.
See Figure 13.
2. Pressurize supply piping system
by either using compressed air or
opening propane/LP supply valve.
3. Check all joints from the propane/
LP supply valve to equipment shutoff
valve. See Figure 14. Apply mixture
of liquid soap and water to gas joints.
Bubbles forming show a leak.
4. Correct all leaks at once.
5. Depressurize and relieve pressure from
supply piping system.
Figure 13
Figure 14
Equipment
Shutoff
Valve
Open
Closed
To regulated
propane source
Control Valve
Equipment Shutoff Valve
Pressure Testing Heater Gas
Connections
1. Make sure that the heater supply
piping system is connected and has
been leak tested as described above.
2. Make sure control knob of heater is in
OFF position.
3. Open equipment shutoff valve. See
Figure 13.
4. Open propane/LP supply valve.
5. Check all joints from equipment
shutoff valve to control valve. See
Figure 14. Apply mixture of liquid
soap and water to gas joints. Bubbles
forming show a leak.
6. Correct all leaks at once.
7. Light heater. See Operating Your
Heater.
8. Turn off heater. See To Turn OFF Gas
to Appliance.
9. Replace lower front panel.
OPERATING YOUR HEATER
For Your Safety Read Before
Lighting
A. This appliance has a pilot that must be
lit by hand. When lighting the pilot,
follow these instructions exactly.
B. BEFORE LIGHTING smell all around
the appliance area for gas. Be sure to
smell next to the floor because some
gas is heavier than air and will settle
on the floor.
WHAT TO DO IF YOU SMELL GAS
• Shut off gas supply.
• Do not try to light any appliance.
• Do not touch any electrical switch; do
not use any phone in your building.
• Immediately call you gas supplier from
a neighbor’s phone. Follow the gas
supplier’s instructions.
• If you can not reach your gas supplier,
call the fire department.
C. Use only your hand to push in or
turn the gas control knob. Never use
tools. If knob will not push in or turn
by hand, don’t try to repair it; call
a qualified service technician or gas
supplier. Force or attempted repair
may result in a fire or explosion.
D. Do not use this appliance if any part
has been underwater. Immediately call
a qualified service technician to inspect
the appliance and to replace any part
of the control system which has been
under water.

10
Mr. Heater | Universal Unvented Room Heater Installation Instructions and Owner’s Manual
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
Lighting Instructions
1. STOP! Read the all safety information
included with and on the side of
heater.
2. Check that gas supply to heater is on.
3. Push in gas control knob and slightly
turn clockwise to the OFF position
See Figure 15.
Note: Knob cannot be turned from
PILOT to OFF unless knob is pushed in
slightly. Do not force.
4. Wait five (5) minutes to clear out any
gas. Then smell for gas, including
near the floor. If you smell gas, STOP!
Follow “B” in the safety information
above. If you do not smell gas, go to
the next step.
5. Push in gas control knob slightly and
turn counterclockwise to PILOT/
IGN and depress for five (5) seconds.
Note: The first time that the heater
is operated after connecting the gas
supply, the control knob should be
depressed for about 30 seconds. This
will allow air to bleed from the gas
system.
6. With control knob pressed in, push
and hold in ignitor button. This will
light pilot. If needed, keep holding the
ignitor button in until pilot lights.
• If pilot does not stay lit, contact a
qualified service person or gas supplier
for repairs. Until repairs are made,
light pilot with match.
7. Keep control knob pressed in for (30)
seconds after lighting pilot. After 30
seconds, release control knob.
• If pilot does not stay lit, repeat steps
5-7 or refer to Troubleshooting, pages
12-15.
• If control knob does not pop up when
released, contact a qualified service
person or gas supplier for repairs.
8. When the pilot is lit, turn the control
knob counterclockwise to desired
heating level. The main burner should
light. Turn the temperature setting
knob to desired comfort setting from
1 to 5.
Figure 16
Correct Pilot Position
Incorrect Pilot Position
CAUTION: Do not try to adjust
heating level by using equipment
shutoff valve.
To Turn Off Gas To Appliance
SHUTTING OFF HEATER:
1. Turn control knob clockwise to
the OFF position.
2. Turn off equipment shutoff valve.
SHUTTING OFF BURNER ONLY
(PILOT STAYS LIT)
1. Turn control knob clockwise to
the PILOT/IGN position.
THERMOSTAT CONTROL
OPERATION
The thermostatic control used
modulates the flame size as the
temperature gets closer to set point,
then it turns off the burner upon
reaching temperature.
The burner will cycle back on when
room temperature drops below the set
temperature. The control knob can be
set to any heat level between 1 and 5.
Selecting the HI setting will cause the
burner to remain on.
INSPECTING BURNER
Check pilot flame pattern and burner
flame pattern often.
PILOT FLAME PATTERN
Figure 16 show a correct pilot flame
pattern and also shows an incorrect
pilot flame pattern. The incorrect
pilot flame pattern is not touching
thermocouple. This will cause the
thermocouple to cool. When the
thermocouple cools, the heater will
shut down. If pilot flame pattern is
incorrect, as shown in Figure 16.
Note: This heater contains 2 pilots; 1
for NG operation and 1 for LP/Propane
operation. Make sure the pilot relevent
to the type of fuel used is always clean.
• Turn heater off (refer back to To Turn
OFF Gas to Appliance)
• See Troubleshooting, pages 12-15.
OPERATION
WARNING: If you do not follow
these instructions exactly, a fire or
explosion may result causing property
damage, personal injury or loss of life.
Figure 15
Igniter Button Control
Knob

11 Installation Instructions and Owner’s Manual
Mr. Heater | Universal Unvented Room Heater
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
WARNING: Failure to keep the
primary air opening(s) of the burner(s)
clean may result in sooting and property
damage.
WARNING: Do not attempt to
access or change the setting of the
fuel selection means. Access to and
adjustment of the fuel selection means
must only be performed by a qualified
service person when connecting this
appliance to a specified fuel supply at
the time of installation. Change of the
selector setting to other than the fuel
type specified at the time of installation
could damage this appliance and render
it inoperable. The installer shall replace
the access cover before completing the
installation and operating this appliance.
WARNING: Do not operate the
heater with the selector valve in-between
locked positions or with the selector
valve set to the incorrect position.
WARNING: Unplug the electrical
cord from the outlet before performing
any service maintenance.
WARNING: Failure to follow these
instructions will result in death, injury
or property damage.
WARNING: Turn off heater and let
cool before performing any service or
maintenance.
CAUTION: You must keep control
areas, burner and circulation air
passageways of heater clean. Inspect
these areas of heater before use. Have
the heater inspected yearly by a qualified
service person. Heater may need more
frequent cleaning due to excess lent
from carpeting, bedding material, pet
hair, etc.
CLEANING AND MAINTENANCE
For maintenance of the inside cabinet
or to access the burner and pilot
assembly for cleaning or service.
Remove the four screws(two located
on each side) that secure the front shell
to the unit. Refer to Figure 6. Gently
lift up on the front shell to disengage
the hooks and pull forward to remove
it. You will now be able to access all
of the internal components of the
appliance.
Make sure grille guard is in place
before running heater. If screen or
grille guard is removed for servicing it
must be replaced prior to operating the
heater.
CLEANING ODS/PILOT AND BURNER
• Use as vacuum cleaner, pressurized air
or small soft bristled brush to clean.
CLEANING BURNER PILOT AIR HOLE
INLET
We recommend that you clean the unit
every 2,500 hours of operation or every
three months. We also recommend
that you keep the burner tube and
pilot assembly clean and free of dust
and dirt. To clean these parts we
recommend using compressed air no
greater than 30 psig.
This can be done by using a vacuum
cleaner in the blow position or
using compressed air in a can. If
using canned air please follow the
directions on the can. If you don’t
follow directions on the can you could
damage the burner or pilot assembly.
In addition, the directions below should
also be followed.
1. Shut off the unit, including the pilot.
Allow the unit to cool for at least thirty
minutes.
2. Inspect burner and pilot for dust and
dirt.
3. Blow air through the port/slots and
holes in the burner.
A yellow tip on the pilot flame indicates
dust and dirt in the pilot assembly.
To clean the pilot assembly find the
small pilot air inlet hole about two
inches from where the pilot flame
comes out of the pilot assembly. See
Figure 17. With the unit off, lightly
blow air through the air inlet hole. You
may blow through a drinking straw if
compressed air is not available.
CLEANING HEATER CABINET
Air passageways
• Use a vacuum cleaner or pressurized
air to clean the air passageways.
Exterior
• Use a soft cloth dampened with a
mild soap and water mixture. Wipe
the cabinet to remove dust.
FUEL CONVERSION
INSTRUCTIONS
Propane/LP to Natural Gas
Conversion Instructions
Step 1: Reveal the selector valve by
removing the screw & access panel on
the back of the heater.
Step 2: The gas selector valve should
be locked in the Propane/LP position.
Push the knob in and then rotate
clockwise until the knob locks into
the Natural Gas position.
Step 3: Remove the plug from the NG
regulator inlet. If there is not already a
plug in the Propane/LP regulator inlet,
install this plug to that inlet after first
applying thread sealant to the plug’s
threads to ensure that there will be no
leaks.
Step 4: Reinstall the access panel to the
rear of the heater with the screw.
Natural Gas to Propane/LP
Conversion Instructions
Step 1: Reveal the selector valve by
removing the screw & access panel on
the back of the heater.
Step 2: The gas selector valve should
be locked in the Natural Gas position.
Push the knob in and then rotate
counterclockwise until the knob
locks into the LP/Propane position.
Step 3: Remove the plug from the
Propane/LP regulator inlet. Install this
plug into the Natural Gas inlet after
first applying thread sealant to the
plug’s threads to ensure that there will
be no leaks.
Step 4: Reinstall the access panel to the
rear of the heater with the screw.
Figure 17
Pilot Assembly
Pilot Air Inlet Hole
MAINTENANCE

12
Mr. Heater | Universal Unvented Room Heater Installation Instructions and Owner’s Manual
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
TROUBLESHOOTING
SYMPTOM
• When ignitor button is pressed in, there is a spark at the ODS/pilot but no ignition.
CAUSE REMEDY
1.Control knob not fully pressed in. 1.Press in control knob fully.
2.Control knob not pressed in long enough. 2.After ODS/pilot lights, keep control knob pressed in for 30 seconds.
3.Equipment shutoff valve not fully open. 3.Fully open equipment shutoff valve.
4.Thermocouple connection loose at control
valve.
4.Hand tighten thermocouple nut until snug, and then tighten 1/4
turn more.
5.Pilot flame not touching thermocouple, which
allows thermocouple to cool, causing pilot
flame to go out. This problem could be caused
by one or both of the following:
a. Low gas Pressure
b.Dirty or Partially clogged ODS/pilot
a. Contact local gas company.
b.Clean ODS/pilot (see Cleaning and Maintenance, page 11).
6.Thermocouple damaged. 6.Replace thermocouple.
7.Control valve damaged. 7.Replace Control valve.
REMEDY
SYMPTOM
• Burner does not light after ODS/pilot is lit.
CAUSE
1.Burner orifice is clogged. 1.Clean burner orifice (see Cleaning and Maintenance on page 11), or
replace burner orifice.
2.Burner orifice diameter to small. 2.Replace burner orifice.
3.Inlet gas pressure is too low. 3.Contact local gas company.
REMEDY
SYMPTOM
• Delayed ignition of burner.
CAUSE
1.Manifold pressure is too low. 1.Contact local gas company. (Natural Gas)
2.Check that the gas regulator at supply (Propane)
2.Burner orifice is clogged. 2.Clean burner orifice (see Cleaning and Maintenance on page 11), or
replace burner orifice.
NOTE: All troubleshooting items are
listed in order of operation and likely
occurrence.
IMPORTANT: Operating heater where
impurities in air exist may create odors.
Cleaning supplies, paint, paint remover,
cigarette smoke, cements and glues,
new carpet or textiles, etc., create
fumes. These fumes may mix with
combustion air and create odors and
possible discoloration of walls and
ceilings.
WARNING: Only a qualified service
person should service and repair heater.
CAUTION: Never use a wire needle,
or similar object to clean ODS/pilot.
This can damage ODS/pilot unit. Make
sure grille guard is in place before
running heater. If screen or grille guard
is removed for servicing it must be
replaced prior to operating the heater.
WARNING: If you smell gas:
• Shut off gas supply
• Do not try to light any appliance
• Do not touch any electrical switch;
do not use any phone in your
building
• Immediately call you gas supplier
from a neighbor’s phone. Follow
the gas supplier’s instructions.
• If you cannot reach your gas
supplier, call the fire department.

13 Installation Instructions and Owner’s Manual
Mr. Heater | Universal Unvented Room Heater
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
TROUBLESHOOTING
SYMPTOM
• Burner backring during operation.
CAUSE REMEDY
1.Burner orifice is clogged or damaged. 1.Clean burner orifice (see Cleaning and Maintenance on
page 11), or replace burner orifice.
2.Burner damaged. 2.Replace burner.
3.Gas regulator defective. 3.Replace gas regulator.
REMEDY
SYMPTOM
• Burner plaque(s) does not glow [Infrared Only].
CAUSE
1.Plaque damaged. 1.Replace burner.
2.Control knob set between locked positions. 2.Turn control knob until it locks at desired setting.
3.Inlet gas pressure is too low. 3.Replace gas regulator.
REMEDY
SYMPTOM
• Heater produces a whistling noise when burner is lit.
CAUSE
1.Air in gas line. 1.Operate burner until air is removed from line have gas
line checked by local gas company.
2.Air passageways on heater blocked. 2.Observe minimum installation clearances (see Figure 4
page 6).
3.Dirty or partially clogged burner orifice. 3.Clean burner orifice (see Cleaning and Maintenance on
page 11), or replace burner orifice.
REMEDY
SYMPTOM
• Slight smoke or odor during initial operation.
CAUSE
1.Residues from manufacturing process. 1.Problem will stop after a few hours of operation.
1.When heated, vapors from furniture polish, wax, carpet
cleaners, etc., turn into white powder residue.
1.Turn heater off when using furniture polish, wax, carpet
cleaner or similar products.
SYMPTOM
• White powder residue forming within burner box or on adjacent walls or furniture.
CAUSE REMEDY

14
Mr. Heater | Universal Unvented Room Heater Installation Instructions and Owner’s Manual
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
REMEDY
SYMPTOM
• Moisture/condensation noticed on windows.
CAUSE
1.Not enough combustion/ventilation air. 1.Refer to Fresh Air for Combustion and Ventilation on pages 4-5.
REMEDY
SYMPTOM
• Heater produces a clicking/ticking noise just after burner is lit or shut off.
CAUSE
1.Metal expanding while heating or contracting
while cooling.
1.This is common with most heaters. If noise is excessive, contact
qualified service person.
REMEDY
SYMPTOM
• Heater produces unwanted odors.
CAUSE
1.Heater burning vapors from paint, hair spray, glues, etc.
See IMPORTANT statement on Page 12.
1.Ventilate room. Stop using odor-causing products while
heater is running.
2.Gas leak. See WARNING statement at top of Page 12. 2.Locate and correct all leaks (see Checking Gas Connec-
tions, page 9).
REMEDY
SYMPTOM
SYMPTOM
SYMPTOM
• Heater shuts off in use (ODS operates).
• Gas odor even when control knob is in OFF position.
• Gas odor during combustion.
CAUSE
CAUSE
CAUSE
1.Not enough fresh air is available. 1.Open window and/or door for ventilation.
2.Low line pressure. 2.Contact local gas company.
3.ODS/pilot is partially clogged. 3.Clean ODS/pilot (see Cleaning and Maintenance, page 11).
1.Gas leak. See WARNING statement at top of
Page 12.
1.Locate and correct all leaks (see Checking Gas Connections, page 9).
2.Control valve is defective. 2.Replace control valve.
1.Foreign matter between control valve and
burner.
1.Take apart gas tubing and remove foreign matter.
2.Gas leak. See WARNING statement at top of
Page 12.
2.Locate and correct all leaks (see Checking Gas Connections, page 9).
TROUBLESHOOTING

15 Installation Instructions and Owner’s Manual
Mr. Heater | Universal Unvented Room Heater
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
THIS PAGE INTENTIONALLY LEFT BLANK
TROUBLESHOOTING

16
Mr. Heater | Universal Unvented Room Heater Installation Instructions and Owner’s Manual
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
PARTS LIST
Mr. Heater • Universal Unvented Room Heater • Model # MHVFDF20BFT
WARNING: Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with
this heater may result in property damage or personal injury.
Item Part No. Description
180122 Wire Guard (Barrier) 1
2N/A Reflector 1
380205 Front Panel 1
480093 Glass 1
580091 Glass Bracket 1
6N/A Burner Left Bracket 1
780216 Burner Assembly 1
880014 Igniter Wire 2
980178 Igniter Module 1
10 80184 Igniter Module Mounting Bracket 1
11 80240 Thermostat Valve 1
12 N/A Thermostat Mounting Valve 1
13 N/A Back Heat Shield 1
15 80013 High Limited Switch (Fan, Optional) 1
16 80206 Back Panel 1
17 80037 Wall Mounting Bracket 1
18 80225 ODS-NG 1
19 N/A Bushing 1 1
20 N/A Bushing 2 1
21 80213 ODS-LP 1
22 N/A ODS Tube Assembly-NG 1
23 N/A Burner Right Bracket 1
24 N/A Selector Valve Nut 1
Item Part No. Description
25 80228 Regulator 1
26 N/A ODS Tube Assembly 2 1
27 80236 Orifice-NG 1
28 80234 Orifice-LP 1
29 N/A ODS Tube Assembly-LP 1
30 N/A Gas Inlet Tube Assembly 1
31 N/A Gas Outlet Tube Assembly 1
32 N/A ODS Tube Assembly 1 1
33 N/A Selector Valve Knob 1
34 N/A Selector Valve 1
35 N/A T-Connection 1
36 80214 Floor Mounting Feet (Pair) 1
37 N/A Selector Valve Cover Plate 1
38 N/A T-stat Sensor Clip 2
39 N/A Blower Shroud Bottom 1
40 N/A Blower Shrould - Top 1
41 F299201 Fan Assembly (Optional) 1
42 N/A Fan Bracket 2
43 N/A Fan Blade 1
44 N/A Fan Cover Plate 1
45 N/A Strain Relief 1
46 80049 Fan Switch (Optional) 1
47 N/A Fan Power Cord 1
B
C
D
1
2
34 5
6
7
8
9
10
11
39 40 41 42 44 46 47 15 16 43
17
38
37
36
18
19
20
21
13
30
31
32
33
34
35
12
45
22
23
24
26
27
28
29
25

17 Installation Instructions and Owner’s Manual
Mr. Heater | Universal Unvented Room Heater
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
PARTS LIST
WARNING: Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with
this heater may result in property damage or personal injury.
Mr. Heater • Universal Unvented Room Heater • Model # MHVFDF20RTT
Item Part No. Description
180094 Wire Guard (Barrier) 1
280086 Reflector 1
380205 Front Panel 1
4N/A Bracket Plenum Assembly 1
5N/A Ceramic Tile 3
6N/A Tile Strip 2
7N/A Tile Gasket 1
880219 Burner Assembly 1
9N/A ODS Bracket 1
10 80178 Igniter Module 1
11 80242 Thermostat Valve 1
12 N/A Thermostat Mounting Bracket 1
13 N/A Selector Valve Nut 1
14 80235 Orifice-LP 1
15 80236 Orifice-NG 1
16 80225 ODS-NG 1
17 N/A Bushing 1 1
18 N/A Bushing 2 1
19 80213 ODS-LP 1
20 80229 Regulator 1
21 N/A ODS Tube Assembly-NG 1
22 N/A ODS Tube Assembly-LP 1
23 N/A ODS Tube Assembly 2 1
24 N/A Selector Valve 1
Item Part No. Description
25 N/A T-Connection 1
26 N/A ODS Tube Assembly 1 1
27 N/A Gas Outlet Tube Assembly 1
28 N/A Gas Inlet Tube Assembly 1
29 N/A Back Heat Shield 1
31 80013 High Limited Switch (Fan,Optional) 1
32 80204 Back Panel 1
33 80037 Wall Mounting Bracket 1
34 N/A T-stat Sensor Clip 2
35 N/A Selector Valve Cover Plate 1
36 80214 Floor Mounting Feet (Pair) 1
37 N/A Blower Shrould - Top 1
38 N/A Blower Shroud Bottom 1
39 F299201 Fan Assembly (Optional) 1
40 N/A Fan Bracket 1
41 N/A Fan Blade 1
42 N/A Fan Cover Plate 1
43 80184 Igniter Module Mounting Bracket 1
44 80049 Fan Switch (Optional) 1
45 N/A Fan Power Cord 1
46 N/A Strain Relief 1
47 80014 Igniter Wire 2
48 N/A Selector Valve Knob 1
1 2 3
37
38
39
40
43
41
45
42
44
46
8
10 11 12
31
29
32
33
3435
36
28
13
14 15
27
26
48
24
23
2221
16
17
18
19 20
9
47
25

18
Mr. Heater | Universal Unvented Room Heater Installation Instructions and Owner’s Manual
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
Mr. Heater • Universal Unvented Room Heater • Model # MHVFDF30BFT
WARNING: Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with
this heater may result in property damage or personal injury.
Item Part No. Description
180123 Wire Guard (Barrier) 1
280208 Front Panel 1
3N/A Reflector 1
4N/A Reflector Back Panel 1
580039 Glass 1
680035 Glass Bracket 1
780217 Burner Assembly 1
8N/A Burner Left Bracket 1
9N/A Thermostat Bracket 1
10 80013 High Limited Switch (Fan, Optional) 1
11 N/A Blower Shroud Bottom 1
12 F299201 Fan Assembly (Optional) 1
13 N/A Fan Bracket 2
14 N/A Blower Shrould - Top 1
15 N/A Fan Blade 1
16 N/A Fan Cover Plate 1
17 80049 Fan Switch (Optional) 1
18 N/A Fan Power Cord 1
19 N/A Strain Relief 1
20 80184 Igniter Module Mounting Bracket 1
21 80178 Igniter Module 1
22 80014 Igniter Wire 2
23 80226 ODS-NG 1
24 N/A Bushing 1 1
25 N/A Bushing 2 1
Item Part No. Description
26 80213 ODS-LP 1
27 N/A ODS Tube Assembly-NG 1
28 N/A ODS Tube Assembly-LP 1
29 N/A Selector Valve Nut 1
30 80238 Orifice-NG 1
31 80237 Orifice-LP 1
32 80230 Regulator 1
33 80223 Regulator Mounting Bracket 1
34 N/A Gas Outlet Tube Assembly 1
35 N/A Selector Valve Nut 1
36 N/A Gas Inlet Tube Assembly 1
37 N/A ODS Tube Assembly 2 1
38 N/A T-Connection 1
39 N/A ODS Tube Assembly 1 1
40 N/A Burner Right Bracket 1
41 80241 Thermostat Valve 1
42 N/A Thermostat Mounting Bracket 1
43 N/A Back Heat Shield 1
45 80214 Floor Mounting Feet (Pair) 1
46 80209 Back Panel 1
47 N/A Selector Valve Cover Plate 1
48 N/A T-Stat Sensor Clip 2
49 N/A Selector Valve Knob 1
50 80037 Wall Mounting Bracket 1
51 N/A Zn-Mn Dry Battery 1
1
2
3
4
5
69
10 11 12 13
15
16
17
19
18
8
14
43
42
41
21
20
23
7
26
27
40
35
34
33
22
45
48
50
46
51
24
25
28
39
38
37
36
31
47
49
30
32
29
PARTS LIST

19 Installation Instructions and Owner’s Manual
Mr. Heater | Universal Unvented Room Heater
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
WARNING: Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with
this heater may result in property damage or personal injury.
Mr. Heater • Universal Unvented Room Heater • Model # MHVFDF30RTT
Item Part No. Description
180041 Wire Guard (Barrier) 1
280208 Front Panel 1
3N/A Reflector 1
4N/A Bracket Plenum Assembly 1
5N/A Ceramic Tile 5
6N/A Tile Strip 4
7N/A Tile Strip 1
8N/A Tile Strip 1
9N/A Thermostat Bracket 1
10 80013 High Limited Switch (Fan, Optional) 1
11 N/A Blower Shroud Bottom 1
12 F299201 Fan Assembly (Optional) 1
13 N/A Fan Bracket 2
14 N/A Blower Shrould - Top 1
15 N/A Fan Blade 1
16 N/A Fan Cover Plate 1
17 80049 Fan Switch (Optional) 1
18 N/A Fan Power Cord 1
19 N/A Strain Relief 1
20 80184 Igniter Module Mounting Bracket 1
21 80178 Igniter Module 1
22 80014 Igniter Wire 2
23 80220 Burner Assembly 1
24 N/A ODS Bottom Bracket 1
25 80225 ODS-NG 1
26 N/A Bushing 1 1
Item Part No. Description
27 N/A Bushing 2 1
28 80213 ODS-LP 1
29 N/A ODS Tube Assembly-NG 1
30 80242 Thermostat Valve 1
31 80238 Orifice-NG 1
32 80237 Orifice-LP 1
33 N/A Selector Valve 1
34 N/A Selector Valve Nut 1
35 N/A ODS Tube Assembly 2 1
36 N/A ODS Tube Assembly-LP 1
37 N/A Thermostat Mounting Bracket 1
38 N/A Gas Outlet Tube Assembly 1
39 N/A Gas Inlet Tube Assembly 1
40 N/A ODS Tube Assembly 1 1
41 N/A T-Connection 1
42 80223 Regulator Mounting Bracket 1
43 80231 Regulator 1
44 N/A Back Heat Shield 1
46 80214 Floor Mounting Feet (Pair) 1
47 80207 Back Panel 1
48 N/A Selector Valve Knob 1
49 N/A T-Stat Sensor Clip 2
50 N/A Selector Valve Cover Plate 1
51 80337 Wall Mounting Bracket 1
52 N/A Zn-Mn Dry Battery 1
46
22
40
39
38
36
35
34
28
20
21
30
37 44
51
14
18
19
17
16
15
13
12
11
10
9
2
1
49
24
27
33
26
52
29
25 31
32
43
42
41
47
48
50
23
3
PARTS LIST

20
Mr. Heater | Universal Unvented Room Heater Installation Instructions and Owner’s Manual
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
Mr. Heater, Inc. reserves the right to make changes at any time, without notice or obligation, in colors, specifications, accessories,
materials and models.
WARRANTY AND PARTS ORDERING
ENERCO GROUP, INC., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 • 800-251-0001
Mr. Heater and Portable Buddy are registered trademarks of Enerco Group, Inc.
© 2021, Enerco/Mr. Heater. All rights reserved
PARTS ORDERING INFORMATION
PURCHASING: Accessories may be purchased at any Mr. Heater local dealer or direct from the factory
FOR INFORMATION REGARDING SERVICE
Please call Toll-Free 800-251-0001
Or visit www.mrheater.com
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 problem in all communication.
LIMITED WARRANTY
Enerco Group, Inc. (EGI) warrants Mr. Heater Vent free heaters to be free from defects in material and workmanship for a
period of five years from the date of manufacture.
• During the first two years, EGI will repair or replace this product if it is proven to be defective within the first two years
and it is returned at customer expense with proof of purchase to the location of EGI’s choice. EGI will be the sole judge
of what is determined to be a defect.
• In year’s three to five, EGI will provide replacements for defective parts to the customer free of charge.
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
WARNING:
USE ONLY 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.
PRODUCT REGISTRATION: Thank you for your purchase.
Please log in to http://www.egiregistration.com to register your product.
UNIVERSAL
UNVENTED
ROOM HEATER
Model # MHVFDF20RTT MHVFDF20BFT
MHVFDF30RTT MHVFDF30BFT