Kenmore Power Miser 6 Manual

							11
Installation  Checklist                                                  
Water Heater Location
Water heater location is important and can affect system 
performance. Please check the following:
□  Installation area free of corrosive elements and flammable 
materials.
□  Centrally located with the water piping system (For new 
installations). Located as close to the gas piping and vent 
pipe system as possible.
□  Located indoors and in a vertical position. Protected from 
freezing temperatures.
□ Proper clearances from combustible surfaces 
maintained and not installed directly on a carpeted floor.
□  Provisions made to protect the area from water damage. 
Metal drain pan installed and piped to an adequate drain.
□  Sufficient room to service the water heater. See Clearances 
and Accessibility section of this manual.
□  Water heater not located near an air moving device.
□  Is the installed environment dirty (excessive amounts of 
lint, dirt, dust, etc.)?  If so, the base-ring filter located on 
the bottom of the water heater will need to be cleaned 
periodically.  Refer to the “Maintenance of your Water 
Heater” section of this manual for information on cleaning 
the base-ring filter. 
Combustion Air Supply and Ventilation
Check for sufficient combustion air supply.  Insufficient air for 
the combustion of gas will result in the flame becoming “lazy”, 
thereby allowing heat to build up in the combustion chamber.  
This excessive heat will cause a thermal switch on the door 
assembly to trip. Is the water heater installed in a closet or other 
small, enclosed space? If so:
□  Are there openings for make-up air to enter and exit the 
room/area? 
□ Are the openings of sufficient size?  Remember, if there 
are other gas-fired or air-consuming appliances in the 
same room, you need more make-up air.  Refer to the 
“Installation Instructions” and “Combustion Air Supply and 
Ventilation” sections for specific requirements.
□ Make sure that fresh air is not taken from areas that contain 
negative pressure producing devices such as exhaust fans, 
dryers, fireplaces, etc.
□   Is there a furnace/air handler in the same room space as 
the water heater?  If so, has a return air duct system been 
attached that exits the room? If so, check for leaks on the 
air duct system. If no air duct system is present, correct 
immediately by contacting a local Heating, Ventilation, Air-
Conditioning & Refrigeration (HVAC-R) authorized service 
provider. 
□  Use a fresh air supply that is free of corrosive elements and 
flammable vapors.
IMPORTANT INFORMATION ABOUT THIS WATER HEATER
This gas water heater was manufactured to voluntary safety standards to reduce the likelihood of a flammable vapor ignition incident. 
The new technology used in meeting these standards makes this product more sensitive to installation errors. Please review the 
following checklist and make any required installation upgrades or changes.  
Questions?  Contact Sears at 1-800-4-MY-HOME (1-800-469-4663).
□  Fresh air openings must be sized correctly with consideration 
given to the blocking effect of louvers and grilles.
□  Ductwork must be the same cross-sectional area as the 
openings.
Vent Pipe System
Check for proper drafting at the water heater draft hood. Refer 
to the “Checking the Draft” section of this manual for the test 
procedure. If the procedure shows insufficient draft is present, 
please check the following:
□  Draft hood properly installed.
□  Vent connectors securely fastened with screws and 
supported properly to maintain six inch clearance.
□  Vent connector made of approved material and sized 
correctly.
□  Vent pipe system installed according to all local and state 
codes or, in the absence of local and state codes, the 
“National Fuel Gas Code”, ANSI Z223.1(NFPA 54)-current 
edition.
□  Flue baffle properly positioned in the flue tube.
□  Check the vent system for restrictions/obstructions and 
check the vent termination height.  Refer to the “Combustion 
Air Supply and Ventilation” section of this water heater 
manual for specific requirements.
□ Recheck for sufficient combustion air supply.
Water System Piping
□  Temperature and pressure relief valve properly installed with 
a discharge line run to an open drain and protected from 
freezing.
□  All piping properly installed and free of leaks.
□  Heater completely filled with water.
□  Closed system pressure build-up devices installed.
□ Tempering valve (when applicable) installed per 
manufacturer’s instructions (See “Water Temperature 
Regulation” section).
Gas Supply and Piping
□  Gas type is the same as that listed on the water heater rating 
plate.
□  Gas line equipped with shut-off valve, union, and  drip leg.
□  Use pipe joint compound or teflon tape marked as being 
resistant to the action of petroleum [Propane (L.P.)] gases.
□  Adequate pipe size and approved pipe material.
□  An approved noncorrosive leak detection solution used 
to check all connections and fittings for possible gas leaks. 
Correct any leak found. 
						

							12
INSTALLATION INSTRUCTIONS
Removing  the  Old  Water  Heater                                                         
FIGURE 2.
1.      Turn “OFF” the gas supply to the 
water heater.
    If the main gas line shutoff valve 
serving all gas appliances is used,  
also shut “OFF” the gas at each 
appliance.  Leave all gas appliances  
shut “OFF” until the water heater 
installation is completed. See 
Figures 2 and 3.
                                            
2.    Turn “OFF” the water supply to 
the water heater at the water 
shut off valve or water meter.  
Some installations require that 
the water be turned off to the 
entire house. See Figures 2 
and 4.
                           
3.      Check again to make sure the gas supply is “OFF” to the water 
heater. Then disconnect the gas supply connection from the 
gas control valve.
4.    Attach a hose to the water heater 
drain valve and put the other end 
in a fl oor drain or outdoors.  (See 
Figures 2 and 5.) Open the water 
heater drain valve.  Open a nearby 
hot water faucet which will relieve 
pressure in the water heater and 
speed draining. The water passing out  
of the drain valve may be extremely 
hot.  To avoid being scalded, make 
sure all connections are tight and that 
the water fl ow is directed away from 
any person. 
5.      Disconnect the vent pipe from the draft hood where it connects 
to the water heater.  In most installations the  vent pipe can 
be lifted off after any screw or other attached devices are 
removed.  Dispose of the draft hood.  The new water heater 
has a draft hood which must be used for proper operation.
6.  If you have copper piping to the water heater, the two copper 
water pipes can be cut with a hacksaw approximately four 
inches away from where they connect to the water heater. 
See Figure 6. This will avoid cutting off pipes too short. 
Additional cuts can be made later if necessary. Disconnect the 
temperature-pressure relief valve drain line. When the water 
heater is drained, disconnect the hose from the drain valve. 
Close the drain valve. The water heater is now completely 
disconnected and ready to be removed.
FIGURE 6.
 
If you have galvanized pipes to the water heater, loosen 
the two galvanized pipes with a pipe wrench at the union in 
each line.  Also disconnect the piping remaining to the water 
heater. See Figure 7.  These pieces should be saved since 
they may be needed when reconnecting the new water heater.  
Disconnect the temperature-pressure relief valve drain line.  
When the water heater is drained, disconnect the hose from 
the drain valve.  Close the drain valve.  The water heater 
is now completely disconnected and ready to be removed. 
Mineral buildup or sediment may have accumulated in the 
old water heater.  This causes the water heater to be much 
heavier than normal and this residue, if spilled out, could 
cause staining.                          
FIGURE 7.
FIGURE 3.
FIGURE 4.
FIGURE 5.CHECK WITH
LOCAL UTILITY
FOR MINIMUM HEIGHT
3” MINIMUM
DRIP LEG
GROUND 
JOINT
UNION
SUITABLE
DRAIN
MANUAL GAS 
SHUT-OFF VALVE
6” MAXIMUM
AIR GAP DISCHARGE PIPE
(DO NOT CAP 
OR PLUG) 1
2
3
4
56      
						

							13
Location  Requirements                                              
Carbon Monoxide Poisoning Hazard
WARNING
Do not install in a mobile home.  
Doing so can result in carbon monoxide poisoning and death.  
The FVIR System is designed to reduce the risk of flammable 
vapor-related fires. The patented system protects your family by 
trapping the burning vapors within the water heater combustion 
chamber through the special flame-arrestor. The burning vapors 
literally “burn themselves out” without escaping back into the 
room. In the event of a flammable vapor incident, the FVIR 
System disables the water heater by shutting off the gas supply 
to the water heater’s burner and pilot, preventing re-ignition 
of any remaining flammable vapors in the area. This will not 
prevent a possible fire/explosion if the igniter is depressed 
and flammable vapors have accumulated in the combustion 
chamber with the pilot light off. If you suspect a flammable 
vapor incident has occurred, do not use this appliance. Do not 
attempt to light this appliance, or depress the igniter button 
if you suspect flammable vapors have accumulated inside or 
outside the appliance. Immediately call a qualified technician to 
inspect the appliance. Water heaters subjected to a flammable 
vapors incident will show a discoloration on the flame-arrestor 
and require replacement of the entire water heater.
FIRE AND EXPLOSION HAZARD
Can result in serious injury or death
        Do not store or use gasoline or other flammable 
vapors and liquids in the vicinity of this or any other 
appliance. Storage of or use of gasoline or other 
flammable vapors or liquids in the vicinity of this or any 
other appliance can result in serious injury or death.
Fl ammable VaporsFLAMMABLES
Read and follow water heater warnings and instructions.
WARNING
Do not use or store flammable products such as gasoline, 
solvents, or adhesives in the same room or area near the 
water heater. If such flammables must be used, all gas burning 
appliances in the vicinity must be shut off and their pilot lights 
extinguished. Open the doors and windows for ventilation while 
flammable substances are in use. 
If flammable liquids or vapors have spilled or leaked in the 
area of the water heater, leave the area immediately and call 
the fire department from a neighbor’s home. Do not attempt to 
clean the spill until all ignition sources have been extinguished.
Fire or Explosion Hazard
WARNING
•  Read instruction manual before installing, using or 
  servicing water heater.
•  Improper use may result in fire or explosion.
•  Maintain required clearances to combustibles.
Keep combustibles such as boxes, magazines, clothes, etc. 
away from the water heater area. 
Site  Location                                                          
•  Select a location near the center of the water piping system. 
The water heater must be installed indoors and in a vertical 
position on a level surface. DO NOT install in bathrooms, 
bedrooms, or any occupied room normally kept closed.
•  Locate the water heater as close to the chimney or gas 
vent as practical. Consider the vent system piping and 
combustion air supply requirements when selecting the 
water heater location. The venting system must be able 
to run from the water heater to termination with minimal 
length and elbows. 
•  Locate the water heater near the existing gas piping. If 
installing a new gas line, locate the water heater to minimize 
the pipe length and elbows. 
•  The water heater should be located in an area not subject 
to freezing temperatures. Water heaters located in 
unconditioned spaces (i.e., attics, basements, etc.) may 
require insulation of the water piping and drain piping 
to protect against freezing. The drain and controls must 
be easily accessible for operation and service. Maintain 
proper clearances as specified on the rating plate.
•  Do not locate the water heater near an air-moving device. 
The operation of air-moving devices such as exhaust fans, 
ventilation systems, clothes dryers, fireplaces, etc., can 
affect the proper operation of the water heater. Special 
attention must be given to conditions these devices may 
create. Flow reversal of flue gases may cause an increase 
of carbon monoxide inside of the dwelling (Figure 8).
•  If the water heater is located in an area that is subjected to 
lint and dirt, it may be necessary to periodically clean the 
base-ring filter and flame-arresto r (s e e E x te r n a l I ns p e c t i o n 
& Cleaning of the Flame-arrestor). 
•  This water heater is not for use in manufactured (mobile) 
homes or outdoor installation.  
NOTE:  This water heater must be installed according to all local 
and state codes or, in the absence of local and state codes, the 
“National Fuel Gas Code”, ANSI Z223.1(NFPA 54)-current edition.
REVERSE FLOW
OF GASES  
EXHAUST FAN
FIGURE 8 
						

							14
IMPORTANT: The water heater should be located in an area 
where leakage of the tank or connections will not result in damage 
to the area adjacent to the water heater or to lower floors of the 
structure. Due to the normal corrosive action of water, the tank will 
eventually leak after an extended period of time. Also any external 
plumbing leak, including those from improper installation, may 
cause early failure of the tank due to corrosion if not repaired.  If 
the homeowner is uncomfortable with making the repair a qualified 
technician should be contacted.  A suitable metal drain pan should 
be installed under the water heater as shown below, to help protect 
the property from damage which may occur from condensate 
formation or leaks in the piping connections or tank. The pan must 
limit the water level to a maximum depth of 1-3/4” and be two inches 
wider than the heater and piped to an adequate drain. NOTE: The 
pan must not restrict combustion air flow. Locate the water heater 
near a suitable indoor drain. Outside drains are subject to freezing 
temperatures which can obstruct the drain line. The piping should 
be at least 3/4” ID and pitched for proper drainage. 
  METAL
DRAIN
PAN
AT LEAST 2” GREATER  THAN THE 
DIAMETER OF THE WATER HEATER.PIPED TO AN 
ADEQUATE DRAIN
FIGURE 9.
Water heater life depends upon water quality, water usage, 
water temperature and the environment in which the water 
heater is installed. Water heaters are sometimes installed 
in locations where leakage may result in property damage, 
even with the use of a drain pan piped to a drain. However, 
unanticipated damage can be reduced or prevented by a leak 
detector or water shut-off device used in conjunction with 
a piped drain pan. These devices are available from some 
plumbing supply wholesalers and retailers, and detect and react 
to leakage in various ways:
•   Sensors mounted in the drain pan that trigger an alarm or 
turn off the incoming water to the water heater when water 
is detected.
•   Sensors mounted in the drain pan that turn off the water 
supply to the entire home when water is detected in the 
drain pan.
•   Water supply shut-off devices that activate based on the 
water pressure differential between the cold water and hot 
water pipes connected to the water heater.
•   Devices that will turn off the gas supply to a gas water 
heater while at the same time shutting off its water supply.
Insulation Blankets                                            
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Insulation blankets available to the general public for external 
use on gas water heaters are not necessary with Kenmore 
products. The purpose of an insulation blanket is to reduce the 
standby heat loss encountered with storage tank heaters. Your 
Kenmore water heater meets or exceeds the National Appliance 
Energy Conservation Act standards with respect to insulation 
and standby loss requirements, making an insulation blanket 
unnecessary.
 WARNING
Should you choose to apply an insulation blanket to this 
heater, you should follow these instructions (See Figure 1 
for identification of components mentioned below). Failure to 
follow these instructions can restrict the air flow required for 
proper combustion, potentially resulting in fire, asphyxiation, 
serious personal injury or death.
• Do not apply insulation to the top of the water heater, as    
this will interfere with safe operation of the draft hood.
• Do not cover the outer door, thermostat or temperature & 
pressure relief valve.
• Do not allow insulation to come within 2” (50.8 mm) of 
the floor to prevent blockage of combustion air flow to the 
burner.
• Do not cover the instruction manual. Keep it on the side of 
the water heater or nearby for future reference.
• Do obtain new warning and instruction labels from Sears 
for placement on the blanket directly over the existing 
labels.
• Do inspect the insulation blanket frequently to make 
certain it does not sag, thereby obstructing combustion air 
flow.
Clearances  and  Accessibility                                    
NOTE: Minimum clearances from combustible materials are 
stated on the label adjacent to the gas control valve/thermostat 
of the water heater.  The water heater is certified for installation 
on a combustible floor.
• IMPORTANT: If installing over carpeting, the carpeting 
must be protected by a metal or wood panel beneath the 
water heater. The protective panel must extend beyond the 
full width and depth of the water heater by at least three 
inches (76.2mm) in any direction; o r i f i n a n a l c ove o r c l o s et 
installation, the entire floor must be covered by the panel. 
• Figure 10 may be used as a reference guide to locate the 
specific clearance locations. A minimum of 24 inches of 
front clearance should be provided for inspection and 
service.   
						

							15
 
BACK
SIDES
TOP
VIEWSIDESVENT
FRONT
24” MINIMUM
FOR SERVICETOP
TO 
CEILING
FIGURE 10.
Filling  the  Water  Heater                                                                                                                                          
Never use this water heater unless it is completely full of water.  
To prevent damage to the tank, the tank must be fi lled with water.  
Water must fl ow from the hot water faucet before turning “ON” gas 
to the water heater. To fi ll the water heater with water:
•   Close the water heater drain valve by turning the handle to 
the right (clockwise). The drain valve is on the lower front of 
the water heater.
Explosion Hazard
•  Use a new CSA approved gas supply line.
•  Install a shut-off valve.
•  Do not connect a natural gas water heater to an 
L.P. gas supply.
•  Do not connect an L.P. gas water heater to a 
natural gas supply.
•  Failure to follow these instructions can result in 
death, explosion, or carbon monoxide poisoning.
WARNING
Gas  Requirements                                                       
IMPORTANT: Read the rating plate to be sure the water heater 
is made for the type of gas you will be using in your home. This 
information will be found on the rating plate located near the 
gas control valve/thermostat. If the information does not agree 
with the type of gas available, do not install or light. Call your 
dealer.
NOTE: An odorant is added by the gas supplier to the gas used 
by this water heater. This odorant may fade over an extended 
period of time. Do not depend upon this odorant as an indication 
of leaking gas.
Gas  Piping                                                                    
The gas piping must be installed according to all local and state 
GAS SUPPLY
codes or, in the absence of local and state codes, the “National 
Fuel Gas Code”, ANSI Z223.1(NFPA 54)-current edition.
Tables 1 and 2 on the following page provide a sizing reference 
for commonly used gas pipe materials. Consult the “National 
Fuel Gas Code” for the recommended gas pipe size of other 
materials.
NOTE: Use pipe joint compound or teflon tape marked as being 
resistant to the action of petroleum [Propane (L.P.)] gases. 
(See Figure 11.)
1.  Install a readily accessible manual shut-off valve in the gas 
supply line as recommended by the local utility. Know the 
location of this valve and how to turn off the gas to this unit.
2.  Install a drip leg (if not already incorporated as part of 
the water heater) as shown. The drip leg must be no less 
than three inches long for the accumulation of dirt, foreign 
material, and water droplets.
3.  Install a ground joint union between the gas control valve/
thermostat and the manual shut-off valve. This is to allow 
easy removal of the gas control valve/ thermostat.
4.  Turn the gas supply on and check for leaks. Test all 
connections by brushing on an approved noncorrosive 
leak-detection solution. Bubbles will show a leak. Correct 
any leak found.
CHECK WITH
LOCAL UTILITY
FOR MINIMUM HEIGHT
3” MINIMUM
DRIP LEG
GROUND 
JOINT
UNION
SUITABLE
DRAIN
MANUAL GAS 
SHUT-OFF VALVE
FIGURE 11. •   Open the cold water supply valve to the water heater.  
NOTE: The cold water supply valve must be left open 
when the water heater is in use.
•   To ensure complete fi lling of the tank, allow air to exit by 
opening the nearest hot water faucet.  Allow water to run until 
a constant fl ow is obtained.  This will let air out of the water 
heater and the piping.
•   Check all water piping and connections for leaks.  Repair as 
needed. 
						

							16
Gas  Pressure                                                         
WARNING
Explosion Hazard
•  Gas leaks can not always be detected by smell.
•  Gas suppliers recommend that you use a gas 
detector approved by UL or CSA.
•  For more information, contact your gas supplier.
•  If a gas leak is detected, follow the “What to do if you 
smell gas” instructions on the cover of this manual.
IMPORTANT: The gas supply pressure must not exceed the maximum 
supply pressure as stated on the water heater’s rating plate. The 
minimum supply pressure is for the purpose of input adjustment.
Gas  Pressure  Testing                                           
IMPORTANT: This water heater and its gas connection must be 
leak tested before placing the appliance in operation.
•  If the code requires the gas lines to be tested at a pressure 
exceeding 14” W.C., the water heater and its manual shut-off 
valve must be disconnected from the gas supply piping system 
and the line capped.
•  If the gas lines are to be tested at a pressure less than 14” W.C., 
the water heater must be isolated from the gas supply piping 
system by closing its manual shut-off valve.
NOTE: Air may be present in the gas lines and could prevent the 
pilot from lighting on initial start-up. The gas lines should be purged 
of air by a qualified technician after installation of the gas piping 
system. While purging the gas piping system of air, ensure that 
the fuel is not spilled in the area of the water heater installation, 
or any source of ignition.  If the fuel is spilled while purging the 
piping system of air follow the “WHAT TO DO IF YOU SMELL 
GAS” instructions on the cover of this manual.
LP  Gas  Only                                                                    
WARNING
Explosion Hazard
Have a qualified person make sure L.P. gas pressure 
does not exceed 13” water column.
Examples of a qualified person include: licensed 
plumbers, authorized gas company personnel, and 
authorized service personnel.
Failure to do so can result in death, explosion, or 
fire.
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Liquefied petroleum gas is over 50% heavier than air and in 
the occurrence of a leak in the system, the gas will settle at 
floor level. Basements, crawl spaces, closets and areas below 
ground level will serve as pockets for the accumulation of gas. 
Before lighting an L.P. gas water heater, smell all around the 
appliance at floor level. If you smell gas, follow the instructions 
as given in the warning on the front page.
When your L.P. tank runs out of fuel, turn off the gas at all 
gas appliances including pilot lights. After the tank is refi lled, 
all appliances must be re-lit according to their manufacturer’s 
instructions. 
						

							17
Carbon Monoxide Warning
Follow all the local and state codes or, in the absence of 
local and state codes, the “National Fuel Gas Code”, 
ANSI Z223.1 (NFPA 54)- current edition to properly 
install vent system.
Failure to do so can result in death, explosion, or 
carbon monoxide poisoning.
WARNING
IMPORTANT:  Air for combustion and ventilation must not 
come from a corrosive atmosphere. Any failure due to corrosive 
elements in the atmosphere is excluded from warranty 
coverage.
The following types of installation (not limited to the following) 
will require outdoor air for combustion due to chemical exposure 
and may reduce but not eliminate the presence of corrosive 
chemicals in the air:
• beauty shops
•  photo processing labs
•  buildings with indoor pools 
•  water heaters installed in laundry, hobby, or craft rooms
•  water heaters installed near chemical storage areas
Combustion air must be free of acid-forming chemicals such as sulfur, 
fluorine, and chlorine. These elements are found in aerosol sprays, 
detergents, bleaches, cleaning solvents, air fresheners, paint, and 
varnish removers, refrigerants, and many other commercial and 
household products. When burned, vapors from these products 
form highly corrosive acid compounds. These products should not 
be stored or used near the water heater or air inlet.
Combustion and ventilation air requirements are determined by 
the location of the water heater. The water heater may be located 
in either an open (unconfined) area or in a confined area or small 
enclosure such as a closet or small room. Confined spaces are 
areas with less than 50 cubic feet for each 1,000 BTUH of the total 
input for all gas-using appliances.
Unconfined  Space                                                   
A water heater in an unconfined space uses indoor air for 
combustion and requires at least 50 cubic feet for each 1,000 
BTUH of the total input for all gas appliances. The table below 
shows a few examples of the minimum square footage (area) 
required for various BTUH inputs.
TABLE 3
BTUH InputMinimum Square
Feet with
8’ CeilingTypical Room
with 8’ Ceiling
30,000 188 9 x 21
45,000 281 14 x 20
60,000 375 15 x 25
75,000 469 15 x 31
90,000 563 20 x 28
105,000 657 20 x 33
COMBUSTION AIR SUPPLY & VENTILATION
TABLE 3
120,000 750 25 x 30
135,000 844 28 x 30
IMPORTANT:
•  The area must be open and be able to provide the proper 
air requirements to the water heater. Areas that are being 
used for storage or contain large objects may not be 
suitable for water heater installation. 
•  Water heaters installed in open spaces in buildings with 
unusually tight construction may still require outdoor air 
to function properly. In this situation, outside air openings 
should be sized the same as for a confined space. 
•  Modern home construction usually requires supplying 
outside air into the water heater area. 
Confined Space                                                     
For the correct and proper operation of this water heater, 
ample air must be supplied for the combustion, ventilation, and 
dilution of flue gases. Small enclosures and confined areas 
must have two permanent openings so that sufficient fresh air 
can be drawn from outside of the enclosure. One opening shall 
be within 12 inches of the top and one within 12 inches of the 
bottom of the enclosure as shown in Figure 12.
The size of each opening (free area) is determined by the total 
BTUH input of all gas utilization equipment (i.e., water heaters, 
furnaces, clothes dryers, etc.) and the method by which the air 
is provided. The BTUH input can be found on the water heater 
rating plate. Additional air can be provided by two methods:
1.   All air from inside the building.
2.   All air from outdoors.
12” MAXIMUM
PERMANENT
OPENINGS TO
THE OUTSIDE OR 
ADDITIONAL 
ROOMS WITHIN
THE BUILDINGCLOSET
OR 
OTHER 
CONFINED 
SPACE
12” MAXIMUM
FIGURE 12.
All  Air  from  Inside  the  Building                              
When additional air is to be provided to the confined area 
from additional room(s) within the building, the total volume of 
the room(s) must be of sufficient size to properly provide the 
necessary amount of fresh air to the water heater and other  
						

							18
TABLE 4
Minimum Free Area of Permanent Openings for Ventilation 
and Combustion Air Supply - All Air from Outdoors Only.
Based on total BTUH input rating for all utilizing equipment 
within the confi ned  space.
Opening SourceMinimum Free Area 
Per Opening (sq. in.)Reference 
Drawing
* D i r e c t  t o  o u t d o o r s 1 sq. in, per 4000 BTUH F i g u r e  14
Ve r t i c a l  D u c t s 1 sq. in, per 4000 BTUH F i g u r e  15
H o r i z o n t a l  D u c t s 1 sq. in, per 2000 BTUH F i g u r e  16
S i n g l e O p e n i n g 1 sq. in, per 3000 BTUH F i g u r e 17
Example: A water heater with an input rating of 50,000 BTUH using 
horizontal ducts would require each opening to have a minimum free 
area of 25 square inches.
Minimum free area = 50,000 BTUH x 1 sq. in. / 2000 BTUH = 25 sq. 
in.
*  These openings connect directly with the outdoors through a 
ventilated attic, a ventilated crawl space, or through an outside 
wall.
Consult the local codes of your area for specific ventilation and 
combustion air requirements.
GABLE VENT
TO OUTDOORS
INSTALL ABOVE
INSULATION
CONFINED
SPACE
ALTERNATE
AIR INLETOUTLET 
AIR TO 
ATTIC 1 SQ.
INCH PER 
4000 BTUH
INLET AIR FROM 
THE CRAWL SPACE
OPEN 
FOUNDATION 
VENT 1 SQ. INCH PER 
4000 BTUH
ALL AIR FROM OUTDOORS: INLET AIR FROM VENTILATED
CRAWL SPACE/OUTLET AIR TO VENTILATED ATTIC 
FIGURE 14.
GABLE VENT
TO OUTDOORS
INSTALL ABOVE
INSULATION
CONFINED
SPACEOUTLET AIR
TO ATTIC
1 SQ. INCH
PER 4000 
BTUH
INLET AIR DUCT
1 SQ. INCH PER
4000 BTUH
12” MAXIMUM
ALL AIR FROM OUTDOORS THROUGH VENTILATED ATTIC
FIGURE 15.
gas utilization equipment in the area. If you are unsure that the 
structure meets this requirement, contact your local gas utility 
company or other qualified agency for a safety inspection. 
Each of the two openings shall have a minimum free area of 1 
square inch per 1,000 BTUH of the total input rating of all gas 
utilization equipment in the confined area, but not less than 100 
square inches (Figure 13).
CONFINED
SPACE
PERMANENT
OPENINGS
1 SQUARE
INCH/1000
BTUH 
(MINIMUM
100 SQ. IN.)
FIGURE 13.
All Air  from  Outdoors                                           
Outdoor fresh air can be provided to a confined area either 
directly or by the use of vertical and horizontal ducts. The 
fresh air can be taken from the outdoors or from crawl or attic 
spaces that freely communicate with the outdoors. Attic or crawl 
spaces cannot be closed and must be properly ventilated to the 
outside. 
Ductwork must be of the same cross-sectional area as the 
free area of the opening to which they connect. The minimum 
dimension of rectangular air ducts cannot be less than three 
inches. 
The size of each of the two openings is determined by the 
method in which the air is to be provided. Refer to Table 4 to 
calculate the minimum free area for each opening. Figures 14, 
15, 16 and 17 are typical examples of each method. 
Louvers  and  Grilles                                                     
In calculating free area for ventilation and combustion air supply 
openings, consideration must be given to the blocking effect 
of protection louvers, grilles, and screens. These devices can 
reduce airflow, which in turn may require larger openings to 
achieve the required minimum free area. Screens must not be 
smaller than 1/4” mesh. If the free area through a particular 
design of louver or grille is known, it should be used in 
calculating the specified free area of the opening. If the design 
and free area are not known, it can be assumed that most wood 
louvers will allow 20 - 25% of free area while metal louvers and 
grilles will allow 60 - 75% of free area. 
Louvers and grilles must be locked open or interconnected with 
the equipment so that they are opened automatically during 
equipment operation. 
Keep louvers and grilles clean and free of debris or other 
obstructions. 
						

							19
1 SQ. INCH PER
2000 BTUH
CONFINED
SPACE
1 SQ. INCH PER
2000 BTUHINLETOUTLET
OUTDOOR
AIR DUCTS
ALL AIR FROM OUTDOORS USING HORIZONTAL DUCTS
FIGURE 16.
ALTERNATIVE
OPENING
LOCATION
1 SQ. INCH 
PER 3000 BTUH CONFINED
SPACE
ALL AIR FROM OUTDOORS - USING A SINGLE PERMANENT OPENING
FIGURE 17.
Vent  Pipe  System                                                   
This water heater uses a non-direct, single-pipe vent system 
to remove exhaust gases created by the burning of fossil fuels. 
Air for combustion is taken from the immediate water heater 
location or is ducted in from the outside (see “Combustion Air 
Supply and Ventilation”).
This water heater must be properly vented for the removal of 
exhaust gases to the outside atmosphere. Correct installation 
of the vent pipe system is mandatory for the proper and efficient 
operation of this water heater and is an important factor in the 
life of the unit.
The vent pipe must be installed according to all local and state 
codes or, in the absence of local and state codes, the “National 
Fuel Gas Code”, ANSI Z223.1(NFPA 54)-current edition. The 
vent pipe installation must not be obstructed so as to prevent 
the removal of exhaust gases to the outside atmosphere.
IMPORTANT: The use of vent dampers is not recommended 
by the manufacturer of this water heater. Although some vent 
dampers are certified by CSA International, this certification 
applies to the vent damper device only and does not mean they 
are certified for use on this water heater.
U.L. recognized fuel gas and carbon monoxide (CO) detectors 
are recommended in all applications and should be installed 
using the manufacturer’s instructions and local codes, rules, or 
regulations.
IMPORTANT:  If you lack the necessary skills required to 
properly install this venting system, you should not proceed, but 
get help from a qualified technician.
Draft  Hood  Installation                                             
SHEET METAL SCREWS (FOUR PROVIDED)
DRAFT HOOD
LEGS LEGS
SLOT SLOT
JACKET TOP
INSTALL THE DRAFT HOOD WITH
THE FOUR SCREWS PROVIDED.
FIGURE 18.
Align the legs of the draft hood with the slots provided. Insert 
the legs and secure the draft hood to the water heater’s top 
with the four screws provided as shown in Figure 18. Do not 
alter the draft hood in any way. If you are replacing an existing 
water heater, be sure to use the draft hood supplied with this 
water heater.
Vent  Pipe  Size                                                               
It is important that you follow the guidelines in these instructions 
for sizing a vent pipe system. If a transition to a larger vent size 
is required, the vent transition connection must be made at the 
draft hood outlet.
Vent  Connectors                                                          
1.  Type B, Double wall, U.L. Listed Vent Pipe.
2.  Single wall Vent Pipe.
Maintain the manufacturer’s specified minimum clearance from 
combustible materials when using type B double wall vent 
pipe.
Vent connectors made of type B, double wall vent pipe material 
may pass through walls or partitions constructed of combustible 
material if the minimum listed clearance is maintained.
Maintain a six inch minimum clearance from all combustible 
materials when using single wall vent pipe.
IMPORTANT: Single wall vent pipe cannot be used for water 
heaters located in attics and may not pass through attic spaces, 
crawl spaces or any confined or inaccessible location. A single 
wall metal vent connector cannot pass through any interior 
wall.
When installing a vent connector, please note the following 
(See Figures 19-21):
•  Install the vent connector avoiding unnecessary bends, 
which create resistance to the flow of vent gases.
•  Install without dips or sags with an upward slope of at least 
1/4-inch per foot.
•  Joints must be fastened by sheet metal screws or other 
approved means. It must be supported to maintain 
clearances and prevent separation of joints and damage.
•  The length of the vent connector cannot exceed 75% of the 
ver tical vent height. 
						

							20
separation, and maintain clearances to combustible materials 
(Figures 20 and 21).
IMPORTANT: This gas vent must be terminated in a vertical 
position to facilitate the removal of the burnt gases.
An unused chimney flue or masonry enclosure may be used as a 
passageway for the installation of a gas vent (Figure 21).
Common (combined) venting is allowable with vertical type B 
vent systems and lined masonry chimneys as long as proper 
draft for the water heater is established under all conditions of 
operation. CAUTION: DO NOT common vent this water heater 
with any power vented appliance.
Figures 19-21 are examples of vent pipe system installations 
and may or may not be typical for your specific application. 
Consult the “National Fuel Gas Code”, NFPA 54, ANSI Z223.1-
current edition and the guidelines set forth by prevailing local 
codes.
VERTICAL GAS VENT SYSTEM WITH 
TYPE B DOUBLE WALL VENT PIPE.
3 FT. MINIMUM
LISTED VENT CAP
2 FT. MINIMUM ABOVE ANY OBJECT 
WITHIN 10 FT. HORIZONTALLY
TYPE B DOUBLE
WALL VENT PIPE
**MAINTAIN
SPECIFIED
CLEARANCE
VENT
CONNECTOR
SLOPE UP
1/4 IN. PER FT.
MINIMUM *MAINTAIN
CLEARANCE
SUPPORT
STRAP
FIGURE 20.
VENTING THROUGH A CHIMNEY WITH
TYPE B DOUBLE WALL VENT PIPE.5 FT. MINIMUMLISTED VENT CAP
VENT  CONNECTOR
UNUSED CHIMNEY
FLUE OR MASONRY
ENCLOSURE SEAL *MAINTAIN
CLEARANCE
VENT
CONNECTOR
SLOPE UP 
1/4 IN. PER FT.
MINIMUM**MAINTAIN
SPECIFIED
CLEARANCE
SUPPORT
STRAP
FIGURE 21.
* Maintain vent pipe clearance requirements to local, state and/or the 
“National Fuel Gas Code”, ANSI Z223.1(NFPA 54)-current edition.
** NFPA 211, Standard for Chimneys, Fireplaces, Vents, and Solid 
Fuel-Burning Appliances states that these chimneys are intended to 
be installed in accordance with the installation instructions provided 
with each chimney support assembly. Minimum air space clearance to 
combustible materials should be maintained as marked on the chimney 
sections.
•  The vent connector must be accessible for cleaning, 
inspection, and replacement.
•  Vent connectors cannot pass through any ceiling, floor, 
firewall, or fire partition.
•  It is recommended (but not mandatory) that a minimum 12 
inches of vertical vent pipe be installed on the draft hood 
prior to any elbow in the vent system.
IMPORTANT: Existing vent systems must be inspected for 
obstructions, corrosion, and proper installation.
Chimney  Connection                                                  
IMPORTANT: Before connecting a vent to a chimney, make sure 
the chimney passageway is clear and free of obstructions. The 
chimney must be cleaned if previously used for venting solid 
fuel appliances or fireplaces. Also consult local and state codes 
for proper chimney sizing and application or, in the absence 
of local and state codes, the “National Fuel Gas Code”, ANSI 
Z223.1(NFPA 54)-current edition.
•  The connector must be installed above the extreme bottom 
of the chimney to prevent potentially blocking the flue 
gases.
•  The connector must be firmly attached and sealed to 
prevent it from falling out.
•  To aid in removing the connector, a thimble or slip joint may 
be used.
•  The connector must not extend beyond the inner edge of 
the chimney as it may restrict the space between it and the 
opposite wall of the chimney (Figure 19).
LISTED LINED
CHIMNEY
2 FT. MINIMUM ABOVE ANY OBJECT 
WITHIN 10FT. HORIZONTALLY
DO NOT EXTEND 
VENT BEYOND EDGE
OF CHIMNEY
VENT
CONNECTOR  3 FT. MINIMUM 
MAINTAIN
CLEARANCE*
SEAL 
SLOPE
UP 1/4 IN.
PER FT.
MINIMUM
CHIMNEY TERMINATION VENT SYSTEM
SUPPORT
STRAP
FIGURE 19.
Do not terminate the vent connector in a chimney that has not 
been certified for this purpose. Some local codes may prohibit 
the termination of vent connectors in a masonry chimney.
Vertical  Exhaust  Gas  Vent                                          
Vertical exhaust gas vents must be installed with U.L. listed type B 
vent pipe according to the vent manufacturer’s instructions and the 
terms of its listing. 
It must be connected to the water heater’s draft hood by a 
listed vent connector or by directly originating at the draft hood 
opening.
Vertical gas vents must terminate with a listed cap or other roof 
assembly and be installed according to their manufacturer’s 
instructions.
Gas vents must be supported to prevent damage, joint