Sure Heat BWH10NLM, BWH20NLTB, BWH30NLTB Safety Information And Installation Manual

UNVENTED (VENT-FREE) BLUE FLAME GAS HEATER

SAFETY INFORMATION AND INSTALLATION MANUAL

INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.

— Do not store or use gasoline or other fl ammable 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 fi re department.
— Installation and service must be performed by a qualifi ed installer, service
agency or the gas supplier.

WARNING: If the information in this manual is not followed exactly, a fi re or
explosion may result causing property damage, personal injury or loss of life.

Model: BWH10NLM

Model: BWH20NLTB

Model: BWH30NLTB

Safety Information .............................................2

Local Codes...................................................... 4

Product Identifi cation ....................................... 4

Unpacking......................................................... 4

Air For Combustion and Ventilation ................. 5

Installation ........................................................ 8

Operating Heater ............................................ 17

Inspecting Heater ............................................19

Cleaning and Maintenance ..............................20

Troubleshooting.............................................. 21

Specifi cations ................................................. 25

Wiring Diagrams ............................................ 25

Replacement Parts ..........................................26

Service Hints ................................................. 29

Technical Service........................................... 29

Service Publications........................................ 29

Warranty Information ........................Back Cover

TABLE OF CONTENT

2

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 qualifi ed installer
service agency or the gas
supplier.

WARNING: This is an unve­nted gas fi 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 Air for Combustion and
Ventilation section on page
5 of this manual.

This appliance is only for use with
the type of gas indicated on the
rating plate. This appliance is not
convertible for use with other
gases.

This appliance may be installed
in an aftermarket,*permanently
located, manufactured (mobile)
home, where not prohibited by
local codes.

* Aftermarket: Completion of sale, not for
purpose of resale, from the manufacturer

WARNING: This product contains
and/or generates chemicals known
to the State of California to cause
cancer or birth defects or other
reproductive harm.

IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, operate
or service this heater. Improper
use of this heater can cause
serious injury or death from burns,
fi re, explosion, electrical shock
and carbon monoxide poisoning.

SAFETY INFORMATION

SAFETY INFORMATION

continued

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, people
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 fuel gases.
Fuel gases are odorless. An odor-making
agent is added to fuel gases. The odor helps
you detect a fuel gas leak. However, the odor
added to fuel gas can fade. Fuel 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.

Due to high temperatures, the
appliance should be located out of
traffi c and away from furniture and
draperies.

Do not place clothing or other
fl ammable material on or near the
appliance. Never place any objects
on the heater.

3

Surface of heater becomes very hot
when running heater. Keep children
and adults away from hot surface
to avoid burns or clothing ignition.
Heater will remain hot for a time after
shut-down. Allow surface to cool
before touching.

Carefully supervise young children
when they are in the same room with
heater.

Make sure Grill is in place before
running heater.

Keep the appliance area clear and
free from combustible materials,
gasoline and other fl ammable vapors
and liquids.

This appliance is only for use with the 1.
type of gas indicated on the rating plate.
Thisappliance is not convertible for use with
other gases.
Do not place propane/LP supply tank(s) 2.
inside any structure. Locate propane/LP
supply tank(s) outdoors.
For room heater having an input rating in 3.
excess of 6000 BTU/hr (1758W), this heater
shall not be installed in a bathroom. For
room heater having an input rating in excess
of 10,000 BTU/hr (2931W), this heater shall
not be installed in a bedroom or bathroom.
If you smell gas4.

• 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 your gas supplier from a
neighbor’s phone. Follow the gas
supplier’s instructions

• if you cannot reach your gas supplier, call
the fi re department
This heater needs fresh, outside air ventila-5.
tion to run properly. This heater has an Oxy­gen Depletion Sensing (ODS) safety shutoff
system. The ODS shuts down the heater if
not enough fresh air is available. See Air for
Combustion and Ventilation, page 5.
Keep all air openings in front and bottom 6.
of heater clear and free of debris. This will
ensure enough air for proper combustion.
If heater shuts off, do not relight until you 7.
provide fresh, outside air. If heater keeps
shutting off, have it serviced.

DANGER: Carbon monoxide
poisoning may lead to death!

WARNING: Do not use a blower
insert, heat exchanger insert or
other accessory not approved for
use with this heater.

WARNING: Any change to
this heater or its controls can be
dangerous.

SAFETY INFORMATION

Continued

8. Do not run heater

• where fl ammable liquids or vapors are
used or stored

• under dusty conditions

9. 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.

10. Do not use heater if any part has been
under water. Call a qualifi ed service technici-
an immediately to inspect the room heater
If necessary, replace some parts of the con-
trol system and some parts of the gas con-
trol which has been under water.

11. Turn off and let cool before servicing. Only
a qualifi ed service person should service
and repair heater.

12. Operating heater above elevations of
4,500 feet could cause pilot outage.

13. To prevent performance problems, do not
use propane/LP fuel tank of less than 100
lbs. capacity.

14. Provide adequate clearances around air
openings.

Install and use heater with care. Follow all lo­cal codes. In the absence of local codes, use
the latest edition of National Fuel Gas Code,
ANSI Z223.1/NFPA 54*.
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269

LOCAL CODES

State of Massachusetts

: The installation

must be made by a licensed plumber or gas
fi tter in the Commonwealth of Massachsetts
Sellers of unvented propane or natural
gas-fired supplemental room heaters shall
provide to each purchaser a copy of 527
CMR 30 upon sale of the unit. Vent-free gas
products are prohibited for bedroom and
bathroom installation in the Commonwealth of
Massachusetts.

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.

PRODUCT FEATURES

SAFETY DEVICE

This heater has a pilot with an Oxygen Deple­tion Sensing (ODS) safety shutoff system. The
ODS/pilot is a required feature for vent-free
room heaters. The ODS/pilot shuts off the
heater if there is not enough fresh air.

PIEZO IGNITION SYSTEM

This heater has a piezo ignitor. This system re­quires no matches, batteries or other sources
to light heater.

THERMOSTATIC HEAT CONTROL

Thermostat models have a thermostat sens­ing bulb and a control valve. This results in the
greatest heater comfort. This can also result
in lower gas bills.

UNPACKING

Figure 1 - Vent-Free Gas Heater

Control Knob

Ignitor Button

Grill

Glass

Heater Cabinet

Shell Front

Product

Identifi cation

4

Switch

AIR FOR COMBUSTION

AND VENTILATION

Today’s homes are built more energy effi cient
than ever. New materials, increased
insulation and new construction methods help
reduce heat loss in homes. Home owners
weather strip and caulk around windows and
doors to keep the cold air out and the warm
air in. During heating months, home owners
want their homes as airtight as possible.
While it is good to make your home energy
effi cient, your home needs to breathe. Fresh
air must enter your home. All fuel-burning ap­pliances need fresh air for proper combustion
and ventilation.
Exhaust fans, fi replaces, clothes dryers and
fuel burning appliances draw air from the
house to operate. You must provide adequate
fresh air for these appliances. This will
ensure proper venting of vented fuel-burning
appliances.

The following are excerpts from National Fuel
Gas Code, ANSI Z223.1/NFPA 54, Section

5.3, Air for Combustion and Ventilation.
All spaces in homes fall into one of the three
following ventilation classifi cations:

1. Unusually Tight Construction

2. Unconfi ned Space

3. Confi ned Space
The information on pages 5 through 7 will
help you classify your space and provide
adequate ventilation.

PROVIDING ADEQUA TE

VENTILATION

Unusually Tight Construction

The air that leaks around doors and windows
may provide enough fresh air for combustion
and ventilation. However, in buildings of un­usually tight construction, you must provide
additional fresh air.
Unusually tight construction is defi ned as
construction where:
a. 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-m ) or less with
openings gasketed or sealed and
b. weather stripping has been added on
openable windows and doors and
c. caulking or sealants are applied to areas
such as joints around window and door
frames, between sole plates and fl oors,
between wall-ceiling joints, between wall
panels, at penetrations for plumbing, electri­ cal and gas lines and at other openings.
If your home meets all of these three criteria,
you must provide additional fresh air. See
Ventilation Air From Outdoors, page 7.
If your home does not meet all of the three
criteria above, proceed to Determining Fresh­Air Flow For Heater Location, page 6.

Confi ned and Unconfi ned Space

The National Fuel Gas Code, ANSI Z223.1/
NFPA 54 defi nes a confi ned space as a space
whose volume is less than 50 cubic feet per
1,000 Btu per hour (4.8

m

3 per kw) of the ag­gregate input rating of all appliances installed
in that space and an unconfi ned space as a
space whose volume is not less than 50 cubic
feet per 1,000 Btu per hour (4.8 m3 per 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 un­confi ned space.
* Adjoining rooms are communicating only if
there are doorless passageways or ventilation
grills between them.

5

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 following instru­ctions to ensure proper fresh air
for this and other fuel-burning
appliances in your home.

AIR FOR COMBUSTION

AND VENTIlATION

Continued

DETERMINING FRESH-AIR FLOW
FOR HEATER LOCATION
Determining if you Have a Confi ned or
Unconfi ned Space
Use this work sheet to determine if you have
a confi ned or unconfi ned space.
Space: Includes the room in which you will
install
heater plus any adjoining rooms with doorless
passageways or ventilation grills between the
rooms.

1. Determine the volume of the space (length
x width x height).
Length x Width x Height =__________cu. ft.
(volume of space)
Example: Space size 20 ft. (6.1 m) (length)
x 16 ft. (4.88 m) (width) x 8 ft. ( .44 m)
(ceiling height) = 560 cu. ft. (7 .49 m3)
(volume of space)
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. Multiply the space volume by 20 to determine
the maximum Btu/Hr the space can support.
________ (volume of space) x 20 = (Maxi­ mum Btu/Hr the space can support)
Example: 560 cu. ft. (72.49 m3) (volume of
space) x 20 = 51,200 (maximum Btu/Hr the
space can support)

3. Add the Btu/Hr of all fuel burning appliances
in the space.
Vent-free heater ____________Btu/Hr
Gas water heater* ____________Btu/Hr
Gas furnace ____________Btu/Hr
Vented gas heater ___________ Btu/Hr
Gas fi replace logs ____________Btu/Hr
Other gas appliances*+ ___________Btu/Hr
Total = ___________Btu/Hr
* Do not include direct-vent gas appliances.
Direct-vent draws combustion air from the
outdoors and vents to the outdoors.
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.

_______ Btu/Hr (maximum can support)
_______ Btu/Hr (actual amount)Example:
51,200 Btu/Hr (maximum the
space can support)
60,000 Btu/Hr (actual amount of
Btu/Hr used)
The space in the above example is a confi ned
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, adding the space of an
adjoining room. If the extra space provides
an unconfi ned space, remove door to
adjoining room or add ventilation grills
between rooms. See Ventilation Air From
Inside Building, page 7.
B. Vent room directly to the outdoors. See
Ventilation Air From Outdoors, page 7.
C. Install a lower Btu/Hr heater, if lower Btu/Hr
size makes room unconfi ned.
If the 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.

6

WARNING: If the area in which
the heater may be operated is small­er than that defi ned as an unconfi ned
space or if the building is of unusua­lly tight construction, provide adequ­ate combustion and ventilation air by
one of the methods described in the
National Fuel Gas Code, ANSI Z223.1/
NFPA 54 Section 5.3 or applicable
local codes.

VENTILA TION AIR

Ventilation Air From Inside Building. This fresh
air would come from an adjoining unconfined
space. When ventilating to an adjoining
unconfined space, you must provide two
permanent openings: one within 12" (30.5
cm) of the ceiling and one within 12" (30.5 cm)
of the fl oor on the wall connecting the two
spaces (see options 1 and 2, Figure 2). You
can also remove door into adjoining room (see
option 3, Figure 2). Follow the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, Section

5.3, Air for Combustion and Ventilation for
required size of ventilation grills or ducts.

AIR FOR COMBUSTION

AND VENTILATION

Continued

Ventilation Air From Outdoors

Provide extra fresh air by using ventilation
grills or ducts. You must provide two perma­nent openings: one within 12" of the ceiling
and one within 12" of the fl oor. Connect these
items directly to the outdoors or spaces open
to the outdoors. These spaces include attics
and crawl spaces. Follow the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, Section

5.3, Air for Combustion and Ventilation for
required size of ventilation grills or ducts.
IMPORTANT: Do not provide openings for
inlet or outlet air into attic if attic has a thermo­stat-controlled power vent. Heated air entering
the attic will activate the power vent.

NOTICE: This heater is intended
for 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.

CHECK GAS TYPE

Use only the correct type of gas (natural or
propane/LP). If your gas supply is not the
correct gas type, do not install heater. Call
dealer where you bought heater for proper
type heater.

7

WARNING: A qualified service
person must install heater. Follow
all local codes.

WARNING: This appliance is
equipped for either natural gas or
propane/LP gas but not both. Gas
type is indicated on the rating plate.
Field conversion is not permitted.

INSTALLATION

Figure 3 - Ventilation Air from Outdoor

Figure 2 - Ventilation Air from Inside

Building

INSTALLATION

Continued

INSTALLATION ITEMS

Before installing heater, make sure you have
the items listed below.

• for propane/LP gas, external regulator
(supplied by installer)

• piping (check local codes)

• sealant (resistant to propane/LP gas)

• equipment shutoff valve *

• ground joint union

• sediment trap

• tee joint

• pipe wrench

• for natural gas, test gauge connection*

• hardware packet

- wall anchor (4)

- key (1)

- Mounting screw, black (4)

- nylon spacer (2)

- Sheet metal screw, silver (4)
* An CSA design-certifi ed equipment shutoff
valve with 1/8" NPT tap is an acceptable alter­native to test gauge connection. The optional
CSA design-certifi ed equipment shutoff valve
can be purchased from your dealer.

LOCATING HEATER

This heater is designed to be mounted on a wall.

You can locate heater on fl oor, away from a wall.
An optional fl oor mounting stand is included.

IMPORTANT: Vent-free heaters add moisture
to the air. Although this is benefi cial, installing
heater in rooms without enough ventilation
air may cause mildew to form from too much
moisture. See Air for Combustion and Ventila­tion, page 5. If high humidity is experienced,
a dehumidifi er may be used to help lower the
water vapor content in the air.

For convenience and effi ciency, install heater

• where there is easy access for operation,
inspection and service

• in coldest part of room
If planning to use fan, locate heater near an
electrical outlet. (Only for models

BWH20NLTB

and BWH30NLTB

)

8

WARNING: Maintain the minimum
clearances shown in Figure 4. If you
can, provide greater clearances from
fl oor, ceiling and joining wall.

WARNING: Never install the heater

in a bathroom for room heater •
having an input rating in excess
of 6000 BTU/hr; in a bedroom or
bathroom for room heater having
an input rating in excess of 10,000
BTU/hr.

in a recreational vehicle•
where curtains, furniture,clothing •
or other fl ammable objects are
less than 36” (91.5 cm) from the
front, top or sides of the heater
as a fi replace insert•
in high traffi c areas•
in windy or drafty areas•

CAUTION: If you install the
heater in a home garage

• heater pilot and burner must be at
least 18” (45.7 cm) above fl oor

• 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 coverings or operating
heater where impurities (such as,
but not limited to, tobacco smoke,
aromatic candles, cleaning fluids,
oil or kerosene lamps, etc.) in the air
exist, may discolor walls or cause
odors.

Figure 4 - Mounting Clearances As

Viewed From Front of Heater

INSTALLING HEATER TO WALL

Mounting Bracket
Locate mounting bracket in heater carton. Re­move mounting bracket from heater carton.

Removing Shell Front Of Heater

1. Remove the four painted screws, two on
side of Shell Front.

2. Pull bottom of Shell Front forward, then out.

3. Remove any remaining packaging materials.

Attaching to Wall Anchor: This method al­lows you to attach mounting bracket to hollow
walls (wall areas between studs) or to solid
walls (concrete or masonry).
Decide which method better suits your needs.
Either method will provide a secure hold for
the mounting bracket.

Marking Screw Locations

1. Tape mounting bracket to wall where
heater will be located. Make sure mount­ ing bracket is level.

9

Figure 6 - Removing Shell Front Of

Heater

Methods For Attaching Mounting Bracket
To Wall

Only use last hole on each end of mounting
bracket to attach bracket to wall. Attach
mounting bracket to wall in one of two ways:

1. Attaching to wall stud

2. Attaching to wall anchor

Attaching to Wall Stud

: This method pro-

vides the strongest hold. Insert mounting
screws through mounting bracket and into
wall studs.

INSTALLATION

Continued

Figure 5 - Mounting Bracket

WARNING: Maintain minimum
clearances shown in Figure 8. If you
can, provide greater clearances from
fl oor and joining wall.

Shell Panel

Screws

2. Mark screw locations on wall (see Figure 7).
Note: Only mark last hole on each end of
mounting bracket. Insert mounting screws
through these holes only.

3. Remove tape and mounting bracket from
wall.

Figure 7 - Mounting Bracket Clearances

A

B

C

ITEM NO. BWH10NLM BWH20NLTB BWH30NLTB

A 8" 12" 16"
B 11" 14" 14"

C 18 3/4" 19 3/4" 19 3/4"