State Water Heaters GS6-40-UBPDS User manual

RESIDENTIAL GAS WATER HEATERS
Installation and Operating Manual
2006 100328750_2000585219_Rev. 01
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE
WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.
POWER DIRECT VENT GAS ULTRA LOW NOx MODELS
WITH HOT SURFACE IGNITION
• For Your Safety •
AN ODORANT IS ADDED TO THE GAS USED
BY THIS WATER HEATER.
Read and understand instruction
manual and safety messages
before installing, operating or
servicing this water heater.
Failure to follow instructions and
safety messages could result in
death or serious injury.
Instruction manual must remain
with water heater.
WARNING
ALL TECHNICAL AND WARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS
PURCHASED. IF YOU ARE UNSUCCESSFUL, PLEASE CONTACT THE COMPANY LISTED ON THE RATING PLATE ON THE WATER HEATER.
GS6-40-UBPDS
GS6-50-UBPDS
SERIES 100
www.statewaterheaters.com
- Do not store or use gasoline or other flamma-
ble 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 suppli-
er'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.
WARNING: If the information in these instruc-
tions is not followed exactly, a fire or explosion
may result causing property damage, personal
injury or death.

2 www.statewaterheaters.com 100328750_2000585219_Rev. 01
TABLE OF CONTENTS
Safe Installation, Use And Service . . . . . . . . . . . . . . . . . 3
General Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Qualified Installer Or Service Agency . . . . . . . . . . . . . 6
Preparing For The Installation. . . . . . . . . . . . . . . . . . . 6
Installation Requirements For The Commonwealth Of
Massachusetts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Get To Know Your Water Heater - Gas Models (List
Referencing Figures 1-5) . . . . . . . . . . . . . . . . . . . . . . 9
Replacement Parts And Deliming Products . . . . . . . 10
Water Piping - Mixing Valve Usage . . . . . . . . . . . . . . 10
Mixing Valves
Water Heater Operation . . . . . . . . . . . . . . . . . . . . . . 11
Electrical Requirements & Wiring Diagram . . . . . . . . 12
Safety Lockouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
High Limit Controls (Energy Cut Off). . . . . . . . . . . . . 13
Thermostat/Water Temperature
Blower High Limit Switch
Blower Air Pressure Switches . . . . . . . . . . . . . . . . . . 13
Locating The New Water Heater . . . . . . . . . . . . . . . . . 13
Facts To Consider About The Location . . . . . . . . . . . 13
Clearances To Combustibles
Floors With Carpeting
Clearances For Servicing
High Ambient Temperature Installations . . . . . . . . . . 14
Important Notes and Warnings
Insulation Blankets . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Air Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Installing The New Water Heater . . . . . . . . . . . . . . . . . 16
Water Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Space Heating And Potable Water Systems . . . . . . . 16
Combo Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
System Requirements
Installation
Closed Water Systems . . . . . . . . . . . . . . . . . . . . . . . 18
Thermal Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Temperature-Pressure Relief Valve. . . . . . . . . . . . . . 19
T&P Valve Discharge Pipe Requirements:
Temperature-Pressure Relief Valve And Pipe
Insulation
High Altitude Installation . . . . . . . . . . . . . . . . . . . . . . 20
Gas Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Sediment Traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Filling The Water Heater . . . . . . . . . . . . . . . . . . . . . . 22
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Vent Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Termination Clearances (Side Wall) . . . . . . . . . . . . . 24
Termination Types . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Side Wall Vent Termination (Standard) . . . . . . . . . . . 25
Roof Vent Termination (Standard). . . . . . . . . . . . . . . 25
Side Wall Vent option For Cold Climates . . . . . . . . . 26
Deluxe Horizontal Venting Kit . . . . . . . . . . . . . . . . . . 26
“Pyramid” Vent Terminal
“Mushroom” Vent Terminal
Connections To The Air Box
Low Profile Side Wall Vent Termination. . . . . . . . . . . 28
Installation Procedure
Concentric Vent Termination . . . . . . . . . . . . . . . . . . . 29
Multiple Concentric Vent Termination . . . . . . . . . . . . 30
Tee Termination (Sidewall & Roof) . . . . . . . . . . . . . . 30
Vent Pipe Material . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Polypropylene Vent Systems . . . . . . . . . . . . . . . . . . 31
Vent Pipe Length And Sizing. . . . . . . . . . . . . . . . . . . 32
Vent Screens
Vent Pipe Installation
Vent Pipe Runs
Vent Terminal Installations
Vent Pipe Preparation . . . . . . . . . . . . . . . . . . . . . . . . 36
Blower Assembly Installation. . . . . . . . . . . . . . . . . . . 38
Connections To The Blower And Air Duct
Condensate (Exhaust) . . . . . . . . . . . . . . . . . . . . . . . 40
Condensate (Intake) . . . . . . . . . . . . . . . . . . . . . . . . . 40
Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . 41
Lighting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Operating The Temperature Control System . . . . . . . . 43
Gas Control Valve/Thermostat . . . . . . . . . . . . . . . . . 44
For Your Information. . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Start Up Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Condensation
Smoke/Odor
Strange Sounds
Operational Conditions . . . . . . . . . . . . . . . . . . . . . . . 45
Smelly Water
“Air” In Hot-Water Faucets . . . . . . . . . . . . . . . . . . . . 45
Periodic Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . 46
General Upkeep . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Venting System Inspection . . . . . . . . . . . . . . . . . . . . 46
Burner Operation And Inspection . . . . . . . . . . . . . . . 46
Combustion Chamber And Burner Cleaning . . . . . . . 47
Housekeeping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Temperature-Pressure Relief Valve Test . . . . . . . . . . 47
Draining And Flushing . . . . . . . . . . . . . . . . . . . . . . . . 48
To Drain The Water Heater Storage Tank
To Flush The Water Heater Storage Tank
Anode Rod Maintenance. . . . . . . . . . . . . . . . . . . . . . 49
Leakage Checkpoints. . . . . . . . . . . . . . . . . . . . . . . . . . 50
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Reference Parts Listing . . . . . . . . . . . . . . . . . . . . . . . . 51
Troubleshooting Guidelines . . . . . . . . . . . . . . . . . . . . . 53
Lockouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Soft Lockout
Hard Lockout
Resetting The Heater Control . . . . . . . . . . . . . . . . . . 53
Ignition State And Timing . . . . . . . . . . . . . . . . . . . . . 53
System Status And Error Codes . . . . . . . . . . . . . . . . 54
Reading The LED Flash Sequence. . . . . . . . . . . . . . 54
Corrective Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Other Symptoms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

100328750_2000585219_Rev. 01 www.statewaterheaters.com 3
SAFE INSTALLATION, USE AND SERVICE
Your safety and the safety of others is extremely important in the installation, use and servicing of this water heater.
Many safety-related messages and instructions have been provided in this manual and on your own water heater to warn you
and others of a potential injury hazard. Read and obey all safety messages and instructions throughout this manual. It is very
important that the meaning of each safety message is understood by you and others who install, use or service this water heater.
This is the safety alert symbol. It is used to alert you
to potential personal injury hazards. Obey all safety
messages that follow this symbol to avoid possible
injury or death.
CAUTION used without the safety alert
symbol indicates a potentially hazardous
situation which, if not avoided, could
result in property damage
CAUTION indicates a potentially
hazardous situation which, if not avoided,
could result in minor or moderate injury.
WARNING indicates a potentially
hazardous situation which, if not avoided,
could result in death or injury.
DANGER indicates an imminently
hazardous situation which, if not avoided,
will result in death or injury.
CAUTION
WARNING
CAUTION
DANGER
All safety messages will generally tell you about the type of hazard, what can happen if you do not follow the safety message
and how to avoid the risk of injury.
This product is certified to comply with a maximum weighted average of 0.25% lead content as required in some areas.
IMPORTANT DEFINITIONS
Qualified Installer: A qualified installer must have ability equivalent to a licensed tradesman in the fields of plumbing,
air supply, venting and gas supply, including a thorough understanding of the requirements of the“National Fuel Gas
Code”, ANSI Z223.1/NFPA 54 as it relates to the installation of gas fired water heaters. The qualified installer must also
be familiar with the design features and use of flammable vapor ignition resistant water heaters and have a thorough
understanding of this Installation and Operating manual.
Service Agency: A service agency also must have ability equivalent to a licensed tradesman in the fields of plumbing,
air supply, venting and gas supply, including a thorough understanding of the requirements of the“National Fuel Gas
Code”, ANSI Z223.1/NFPA 54 as it relates to the installation of gas fired water heaters. The service agency must also
have a thorough understanding of this Installation and Operating manual, and be able to perform repairs strictly in
accordance with the service guidelines provided by the manufacturer.
Gas Supplier: The Natural Gas Utility or service who supplies gas for utilization by the gas burning appliances within
this application. The gas supplier typically has responsibility for the inspection and code approval of gas piping up to
and including the Natural Gas meter of a building. Many gas suppliers also offer service and inspection of appliances
within the building.

4 www.statewaterheaters.com 100328750_2000585219_Rev. 01
GENERAL SAFETY
Water temperature over
125°F can cause severe
burns instantly resulting in
severe injury or death.
Children, the elderly and the
disabled are at highest risk
of scald injury.
Feel water before bathing or
showering.
Temperature limiting valves
are available.
Read instruction manual for
safe temperature setting.
BURN
HOT
HOT
DANGER
Read instruction manual before
installing, using or servicing
water heater.
• Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.
• Avoid all ignition sources if you smell gas.
• Do not expose water heater control to excessive
gas pressure.
• Use only gas shown on rating plate.
• Maintain required clearances to combustibles.
• Keep ignition sources away from faucets after
extended period of non-use.
Fire or Explosion Hazard
WARNING
For continued protection against
risk of fire:
• Do not install water heater on
carpeted floor.
• Do not operate water heater if
flood damaged.
Fire Hazard
WARNING
•Overheated water can cause
water tank explosion.
•Properly sized temperature and
pressure relief valve must be
installed in opening provided.
Explosion Hazard
WARNING
Read and understand instruction
manual and safety messages
before installing, operating or
servicing this water heater.
Failure to follow instructions and
safety messages could result in
death or serious injury.
Instruction manual must remain
with water heater.
WARNING

100328750_2000585219_Rev. 01 www.statewaterheaters.com 5
GENERAL SAFETY
Installation: Do not install the water heater where flammable
products will be stored or used.
Vapors from flammable
liquids may explode and
catch fire causing death or
severe burns.
Do not use or store flamma-
ble products such as gaso-
line, solvents or adhesives in
the same room or area near
the water heater.
Keep flammable products:
1. far away from heater,
2. in approved containers,
3. tightly closed and
4. out of children's reach.
Water heater has a main
burner and hot surface igniter.
The hot surface igniter:
1. can be triggered at any
time and
2. the hot surface will ignite
flammable vapors.
Vapors:
1. cannot be seen,
2. are heavier than air,
3. go a long way on the floor
and
4. can be carried from other
rooms to the electrodes
by air currents.
Flammable Vapors
FLAMMBLE
WARNING
Breathing carbon monoxide can cause brain damage or death.
Always read and understand instruction manual.
• Install vent system in accordance with codes.
• Do not operate water heater if flood damaged.
• For operation above 10,100’, a high altitude
orifice must be installed.
• Do not operate if soot buildup is present.
• Do not obstruct water heater air intake with
insulating jacket.
• Do not obstruct blower air intake.
• Do not place chemical vapor emitting products
near water heater.
• Gas and carbon monoxide detectors are
available.
• No vent damper installation is compatible with
this power vented water heater.
Breathing Hazard - Carbon Monoxide Gas
WARNING
• Before servicing the water heater, make
sure the blower assembly is unplugged
or the electrical supply to the water
heater is tumed "OFF".
• Label all wires prior to disconnection
when servicing controls. Wiring error can
cause improper and dangerous opera-
tion. Verify proper operation after
servicing.
• Failure to do this could result in death,
serious bodily injury, or property
damage.
WARNING
• Do not operate water heater if flood damaged.
• Inspect anode rods regularly, replace when significantly
depleted.
• Install in location with drainage.
• Fill tank with water before operation.
• Properly sized thermal expansion tanks are required on all
closed water systems.
Refer to this manual for installation and service.
Improper Installation, use and service may result
in property damage.
CAUTION

6 www.statewaterheaters.com 100328750_2000585219_Rev. 01
INTRODUCTION
Thank You for purchasing this water heater. Properly
installed and maintained, it should give you years of trouble
free service. This water heater is suitable for potable water
heating and space heating applications but not for space
heating only applications.
Abbreviations found in this Installation and Operating
manual:
• CSA - Canadian Standards Association
• ANSI - American National Standards Institute
• NFPA - National Fire Protection Association
• ASME - American Society of Mechanical Engineers
• UL - Underwriters Laboratories Inc.
• AHRI - Air Conditioning, Heating and Refrigeration
Institute.
• SCAQMD - South Coast Air Quality Management
District
This gas-fired water heater is design certified by CSA
International as a Category IV water heater, under Water
Heater Standard ANSI Z21.10.1 • CSA 4.1 (current
edition).
QUALIFIED INSTALLER OR SERVICE AGENCY
Installation and service of this water heater requires ability
equivalent to that of a Qualified Agency (as defined by
ANSI below) in the field involved. Installation skills such
as plumbing, air supply, venting, gas supply and electrical
supply are required in addition to electrical testing skills
when performing service.
ANSI Z223.1 2006 Sec. 3.3.83: “Qualified Agency” - “Any
individual, firm, corporation or company that either in
person or through a representative is engaged in and is
responsible for (a) the installation, testing or replacement
of gas piping or (b) the connection, installation, testing,
repair or servicing of appliances and equipment; that
is experienced in such work; that is familiar with all
precautions required and that has complied with all the
requirements of the authority having jurisdiction.”
If you are not qualified (as defined by ANSI above) and
licensed or certified as required by authority having
jurisdiction to perform a given task, do not attempt to
perform any of the procedures described in this manual.
If you do not understand the instructions given in this
manual do not attempt to perform any procedures outlined
in this manual.
PREPARING FOR THE INSTALLATION
1. Read the "General Safety" section of this manual
first and then entire manual carefully. If you don’t
follow safety rules, the water heater will not operate
properly. It could cause DEATH, SERIOUS BODILY
INJURYAND/OR PROPERTY DAMAGE. This manual
contains instructions for installation, operation,
and maintenance of the gas-fired water heater. It
also contains warnings throughout the manual that
you must read and be aware of. All warnings and
instructions are essential to proper operation of the
water heater and your safety. Since we cannot put
everything on the first few pages, READ ENTIRE
MANUAL BEFORE ATTEMPTING TO INSTALL OR
OPERATE THE WATER HEATER.
2. The installation must conform with these instructions
and local code authority having jurisdiction. In absence
of local codes, installation must comply with current
editions of the“National Fuel Gas Code”, ANSI
Z223.1/NFPA 54 and“National Electrical Code”,
NFPA 70. All documents are available from:
CSA International,
8501 East Pleasant Valley Road,
Cleveland, Ohio, United States
44131-5575.
NFPA documents are also available from:
National Fire Protection Association,
1 Batterymarch Park,
Quincy, MA 02269.
3. The water heater, when installed, must be electrically
grounded in accordance with the local codes or in
the absence of local codes: current edition of the
“National Electrical Code”, NFPA 70.
4. If after reading this manual you have any questions or
do not understand any portion of the instructions, call
the local gas utility or the manufacturer whose name
appears on the rating plate.
5. Carefully plan the place where you are going to put
the water heater. Correct combustion, vent action,
and vent pipe installation are very important in
preventing death from possible carbon monoxide
poisoning and fires (see Figure 10). Examine the
location to ensure the water heater complies with
the "Locating The New Water Heater" section in this
manual.
6. For installation in areas subject to earthquakes, this
water heater must be braced, anchored, or strapped
to avoid falling or moving during an earthquake.
See instructions for correct installation procedures.
Instructions may be obtained from:
California Office of the State Architect,
400 P Street,
Sacramento, CA 95814.
7. Massachusetts Code requires this water heater to be
installed In accordance with Massachusetts 248-CMR
2.00: State Plumbing Code and 248-CMR 5.00.
8. This product is certified to comply with a maximum
weighted average of 0.25% lead content as required
in some areas.
9. This heater also is design certified by SCAQMD with
NOx emmision lower than 10 NG/J, and 15 PPM @
3% O2.

100328750_2000585219_Rev. 01 www.statewaterheaters.com 7
INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS
COMMONWEALTH OF MASSACHUSETTS
For all side wall terminated, horizontally vented power vent, direct vent and power direct vent gas fueled water heaters
installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned
or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above
finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall
be satisfied:
INSTALLATION OF CARBON MONOXIDE DETECTORS
At the time of installation of the side wall horizontal vented gas fueled equipment, the installing plumber or gasfitter shall
observe that a hard wired carbon monoxide detector with an alarm and battery back-up is installed on the floor level where
the gas equipment is to be installed. In addition, the installing plumber or gasfitter shall observe that a battery operated
or hard wired carbon monoxide detector with an alarm is installed on each additional level of the dwelling, building or
structure served by the sidewall horizontal vented gas fueled equipment. It shall be the responsibility of the property owner
to secure the services of qualified licensed professionals for the installation of hard wired carbon monoxide detectors.
In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic, the hard
wired carbon monoxide detector with alarm and battery back-up may be installed on the next adjacent floor level.
In the event that the requirements of this subdivision can not be met at the time of completion of installation, the owner
shall have a period of thirty (30) days to comply with the above requirements provided that during said thirty (30) day
period, a battery operated carbon monoxide detector with an alarm shall be installed.
APPROVED CARBON MONOXIDE DETECTORS
Each carbon monoxide detector as required in accordance with the above provisions shall comply with NFPA 720 and
be ANSI/ UL 2034 listed and CSA certified.
SIGNAGE
A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum height
of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating
appliance or equipment. The sign shall read, in print size no less than one- half (1/2) inch in size, “GAS VENT DIRECTLY
BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS.”
INSPECTION
The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall not approve the installation
unless, upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance with
the provisions of 248 CMR 5.08(2)(a) 1 through 4.
EXEMPTIONS
The following equipment is exempt from 248 CMR 5.08(2) (a) 1 through 4:
1. The equipment listed in Chapter 10 entitled “Equipment Not Required To Be Vented” in the most current edition of
NFPA 54 as adopted by the Board; and
2. Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure separate from
the dwelling, building, or structure used in whole or in part for residential purposes.
MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM PROVIDED
When the manufacturer of Product Approved side wall horizontally vented gas equipment provides a venting system
design or venting system components with the equipment, the instructions provided by the manufacturer for installation
of the equipment and the venting system shall include:
1. Detailed instructions for the installation of the venting system design or the venting system components; and
2. A complete parts list for the venting system design or venting system.
MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED
When the manufacturer of Product Approved side wall horizontally vented gas fueled equipment does not provide the
parts for venting the flue gases, but identifies “special venting systems,” the following requirements shall be satisfied by
the manufacturer:
1. The referenced “special venting system” instructions shall be included with the appliance or equipment installation
instructions; and
2. The “special venting systems” shall be Product Approved by the Board, and the instructions for that system shall
include a parts list and detailed installation instructions.
A copy of all installation instructions for all Product Approved side wall horizontally vented gas fueled equipment, all
venting instructions, all parts lists for venting instructions, and/or all venting design instructions shall remain with the
appliance or equipment at the completion of the installation.

8 www.statewaterheaters.com 100328750_2000585219_Rev. 01
• If your water heater will be installed in the Commonwealth of Massachusetts, refer to the following
graphic during installation and during modifications to the water supply system.
IN
REMOVE A
MUST BE VERTICAL TO
IR BUBBLES
E
OUT
COIL
AIR
HANDLER
TO
AIR
HANDLER
SHUT-OFF
VALVE *
EXPANSION TANK
VACUUM
RELIEF
VALVE
COLD WATER INLET
VA
FLOW CONTROL
LV
PUMP *
SHUT-OFF
CHECK VALVE
†
(1/8” HOLE
DRILLED IN CLAPPER)
VALVE
CHECK
VALVE †
TEMP/
PRESSURE
RELIEF
VALVE
TEMPERED WATER
TO FIXTURES
(MUST MEET TEMPS LISTED
IN MASS. CODE 248 CMR †)
MIXING VALVE
(MUST BE INSTALLED BELOW
TOP OF WATER HEATER
AS PER MANUFACTURER’S
RECOMMENDATIONS)
UNION UNION
HOT
WATER
OUT
*MASSACHUSETTS INSTALLATION REQUIREMENTS:
1.) CONNECT ELECTRONICALLY-CONTROLLED TIMER TO AN ALL-BRONZE PUMP. PUMP MUST ACTIVATE EVERY 6 HOURS
FOR 60 SECONDS. TURN PUMP TIMER OFF BEFORE CLOSING PIPING LOOP SHUT-OFF VALVE.
2.) ALL WATER PIPING MUST BE INSTALLED AND INSULATED IN ACCORDANCE WITH MASSACHUSETTS CODE (248 CMR
& 780 CMR).
3.) PIPING LOOP BETWEEN WATER HEATER AND AIR HANDLER MUST BE INSTALLED IN COMPLIANCE WITH 248 CMR.
† REQUIRED FOR MASSACHUSETTS.
‡ PIPING FROM THE TOP OF THE WATER HEATER WITH TEES IS ACCEPTABLE.
WATER HEATER ACCEPTED
BY THE BOARD FOR
INSTALLATION IN
MASSACHUSETTS. †
TYPICAL MIXING VALVE INSTALLATION
COMBINATION SPACE HEATING / POTABLE WATER HEATING SYSTEM
SEE
NOTE ‡
INSTALLATION GRAPHIC: GAS-FIRED POTABLE
WATER HEATING/SPACE HEATING SYSTEM
100’-0” MAXIMUM DISTANCE
FROM WATER HEATER TO FAN
COIL AND BACK. (DEVELOPED
LENGTH) NOT INCLUDING COIL
IN HEATING UNIT †
This water heater is not equiped
with Side Taps for "Combo" heating.

100328750_2000585219_Rev. 01 www.statewaterheaters.com 9
TYPICAL INSTALLATION
GET TO KNOW YOUR WATER HEATER - GAS MODELS (LIST REFERENCING FIGURES 1-5)
1 Termination Elbow with Vent Screen
2 *Vent Pipe
3 *Vent Pipe Elbow (long radius)
4 *Union (Di-electric water connection)
5 Cold-Water Inlet Nipple/Diptube
6 T&P Valve
7 *Discharge Pipe
8 Gas Control Valve/Thermostat
(Honeywell)
9 Drain Valve
10 Outer Gas Door
11 Manifold Door Assembly (behind
outer door) (see Figure 3)
12 *Metal Drain Pan
13 *Floor Drain
14 Flexible Manifold Tube (see
Figure 3)
15 **Control Harness
16 *Sediment Trap
17 *Ground Joint Union (gas
connection)
18 *Main Manual Gas Shut-off Valve
19 *Gas Supply*
20 Anode (under cap)
21 Baffle Assembly
22 Hot-Water Outlet Nipple/Anode
23 *Inlet Water Shut-off Valve
24 ***Rubber Coupling (see Figure 4)
25 Gear Clamp (see Figure 4)
26 **Blower with Power Cord (see
Figure 4)
27 Air Duct Adapter
28 Air Inlet Snorkel
29 Air Duct
30 *Thermal Expansion Tank (see
"Closed Water Systems" and
"Thermal Expansion" sections)
31 Flame Sensor Rod (see Figure 3)
32 Sheet Metal Burner (see Figure 3)
33 Gas Orifice (see Figure 3)
34 Flex Gas Line (see Figure 3)
35 Hot-Surface Igniter (see Figure 3)
36 Manifold Door Gasket (see Figure 3)
37 Manifold Door (see Figure 3)
38 Two Piece Grommet With Clip (see
Figure 3)
39 Viewport (see Figure 3)
40 Air Tubing (Intake) (see Figure 4)
41 Blower High Limit Switch (see
Figure 4)
42 Intake Air Pressure Switch (NC)
(inside box) (see Figure 4)
43 Capacitor (see Figure 4)
44 Air Tubing (Exhaust) (see Figure 4)
45 Exhaust Air Pressure Switch (NO)
(inside box) (see Figure 4)
*, **, *** see notes on following page
Front View
123
4
6
5
7
9
12
1314
16
17
18
19
21
4
22
12
8
10 11
20
5
15
Figure 1.
3
Rear View
23
30
4
25
26
29
24
AIR INLET
PIPING EXHAUST
OUTLET PIPING
28
27
Figure 2.

10 www.statewaterheaters.com 100328750_2000585219_Rev. 01
38
35
37
36
32
31
33
34 39
Figure 3.
24
40
45
26
42
Shown with Junction Box
Cover removed for clarity.
41
44
25
43
Figure 4.
Vacuum relief valve install
per local codes (not
supplied with heater).
Figure 5.
Figure 6.
Notes:
* Items not supplied with the water heater.
** Caution: harness has 120 VAC during operation.
*** See "Vent Pipe Installation" for more information.
REPLACEMENT PARTS AND DELIMING PRODUCTS
Replacement parts and recommended delimer may be
ordered through authorized servicers or distributors. When
ordering parts, provide complete model and serial numbers
(see rating plate), quantity and name of part desired.
Standard hardware items may be purchased locally.
WATER PIPING - MIXING VALVE USAGE
Mixing Valves
Water temperature over
125°F can cause severe
burns instantly resulting in
severe injury or death.
Children, the elderly and the
disabled are at highest risk
of scald injury.
Feel water before bathing or
showering.
Temperature limiting valves
are available.
Read instruction manual for
safe temperature setting.
BURN
HOT
HOT
DANGER
Water heated to a temperature which satisfies space
heating, clothes washing, dish washing, and other
sanitizing needs can scald and cause permanent injury
upon contact. Short repeated heating cycles caused by
small hot-water uses can cause a temperature increase of
the hot water by 30F° higher than the heater’s temperature
settings. If you choose a higher temperature setting,
Thermostatic Mixing Valves (see Figure 6) located at
each point-of-use are particularly important to help avoid
scalding.
This appliance has been design certified as complying with
ANSI/CSA Standard for water heaters and are considered
suitable for combination Water (Potable) Heating and
Space Heating but not space heating only applications.
The water supply pressure should not exceed 80 psi. If this
occurs, a pressure reducing valve with a bypass should be
installed in the cold water inlet line. This should be placed
on the supply to the entire house in order to maintain equal
hot and cold water pressures.
Some people are more likely to be permanently injured
by hot water than others. These include the elderly,
children, the infirm and the physically/mentally disabled.
Table 1 (published by U.S. Government Memorandum,
1978) shows the approximate time-to-burn relationship
for normal adult skin. If anyone using hot water provided
by the water heater being installed fits into one of these
groups, special precautions must be taken.

100328750_2000585219_Rev. 01 www.statewaterheaters.com 11
Water
Temperature
°F
Time for 1st
Degree Burns
(Less Severe Burns)
Time for Permanent
Burns 2nd & 3rd
Degree (Most
Severe Burns)
110 (normal shower temp.)
116 (pain threshold)
116 35 minutes 45 minutes
122 1 minute 5 minutes
131 5 seconds 25 seconds
140 2 seconds 5 seconds
149 1 second 2 seconds
154 instantaneous 1 seconds
(U.S. Government Memorandum, C.P.S.C., Peter L.
Armstrong, Sept. 15,1978)
Table 1.
In addition to using lowest possible temperature setting
that satisfies demand of application, to reduce the risk of
scalding, install Thermostatic Mixing Valves (temperature
limiting valves) (see Figure 6) at each point-of-use. These
valves automatically mix hot and cold water to limit the
temperature at the tap.
Thermostatic Mixing Valves are available from your
local plumbing supplier. Consult a Qualified Installer or
Service Agency. Follow mixing valve manufacturer’s
instructions for installation of the valves. Before
changing the factory setting on the thermostat, read the
"Operating The Temperature Control System" section in
this manual.
WATER HEATER OPERATION
Figure 7 shows the water heater’s sequence of operation
when a call for heat is initiated. The ignition control module
will attempt to light the burner three times. If the ignition
control does not detect ignition it will enter lockout mode
and flash the corresponding error code.
HEATER CONTROL
CHECKS TO ENSURE
BLOWER EXHAUST
PRESSURE SWITCH IS
OPEN
BLOWER IS ENERGIZED
CONTROL CHECKS TO
ENSURE: EXHAUST
PRESSURE SWITCH
CLOSES AND INTAKE
PRESSURE SWITCH
REMAINS CLOSED
INDICATING BLOWER IS
OPERATING AND THERE
ARE NO BLOCKAGES
(INTAKE OR EXHAUST)
TEMPERATURE SWITCH
REMAINS CLOSED
INDICATING VENT
TEMPERATURE IS NOT
ABOVE THE ALLOWABLE
LIMIT
IGNITER IS ENERGIZED
AND GAS VALVE IS
OPENED
BURNER COMES ON AND
THE FLAME IS SENSED
BY CONTROL
BURNER CONTINUES
TILL THE WATER IN
THE TANK REACHES
THERMOSTAT SETTING
GAS VALVE IS CLOSED
AND BURNER SHUTS
OFF
HEATER
THERMOSTAT
CALLS FOR
HEAT
HEATER
REMAINS ON
STANDBY UNTIL
NEXT CALL FOR
HEAT
BLOWER CONTINUES
FOR A POST PURGE
TIME
Figure 7.

12 www.statewaterheaters.com 100328750_2000585219_Rev. 01
ELECTRICAL REQUIREMENTS & WIRING DIAGRAM
Failure to do so can result in
death or electrical shock.
Replace all parts and panels
before operating.
Disconnect power before
servicing.
Electric Shock Hazard
WARNING
Before plugging in the water heater, always make sure:
• The voltage and frequency correspond to that specified
on the water heater wiring diagram.
• The electrical outlet has the proper overload fuse or
breaker protection.
1. The unit must be connected to a 120VAC power
supply. A dedicated circuit is preferred. Do not use a
GFI outlet.
2. The water heater must be properly grounded.
3. This water heater is a polarity sensitive appliance and
will not operate if the power supply polarity is reversed.
Note: Always reference the wiring diagram for the correct
electrical connections.
After making all electrical connections, completely fill the
tank with water and check all connections for leaks. Open
the nearest hot-water faucet and let it run for 3 minutes to
purge the water lines of air and sediment and to ensure
complete filling of the tank. The electrical power may then
be turned on. Verify proper operation after servicing. See
also "Installation Checklist".
BLUE
120VAC/60HZ
WALL PLUG
WHITE - NEUTRAL
IGNITER - FLAME ROD
ASSEMBLY
PRESSURE
SWITCH
(NC)
PRESSURE
SWITCH
(NO)
CAPACITOR
BLACK - LINE
GREEN - GND
YELLOW-GREEN
BLUE
BLUE
BLUEBLUE
BROWN
BROWN
WHITE
YELLOW
JUNCTION BOX HONEYWELL
GAS VALVE
HIGH LIMIT SWITCH
IF WIRING HAS TO BE REPLACED IN THE FIELD, USE ONLY TYPE TEW 105°C WIRE.
ELECTRICAL RATING 120V, 5A, 60HZ.
BLOWER
BLACK
WHITE
BLUE
GREEN
YELLOW
YELLOW
WHITE
WHITE
WHITE WHITE-BLUE
2
3
4
5
6
2
3
4
1
2
3
4
1
1
1
4
5
6
1
2
3
4
5
6
JP
2
3
Figure 8.
CAUTION:
LABELALL WIRES PRIOR TO DISCONNECTION WHEN
SERVICING CONTROLS. WIRING ERRORS CAN
CAUSE IMPROPER AND DANGEROUS OPERATION.
VERIFY PROPER OPERATION AFTER SERVICING.
NOTE: REFER TO THE “INSTALLATION CHECKLIST”
BEFORE OPERATING THIS HEATER.
N
HOT SURFACE IGNITER
HIGH LIMIT SWITCH (CLOSED)
CAPACITOR
L1
EARTH GND
PRESSURE SWITCH (CLOSED)
PRESSURE SWITCH (OPEN)
PRESSURE SWITCH (CLOSED)
BLOWER
FLAME SENSOR
Circled numbers indicate
sequence of operation.
3
5
1
4
2
4
6
1
4
P1
P2
P3
P4
1
2
3
4
5
6
4
3
2
1
2
1
3
4
Figure 9.

100328750_2000585219_Rev. 01 www.statewaterheaters.com 13
SAFETY LOCKOUTS
This water heater has several lockout features designed
to prevent the heater from operating in unsafe conditions.
HIGH LIMIT CONTROLS (ENERGY CUT OFF)
Thermostat/Water Temperature
This feature is a part of the gas control valve/thermostat
(see Figure 1, item 8) and limits the maximum water
temperature. In the event of the water overheating, this
safety feature shuts off the fuel supply to the burner.
Blower High Limit Switch
This device is located on the blower (see Figure 4, item
41) and limits the maximum temperature of the blower.
If the blower temperature rises above the temperature
setting, the switch opens causing the heater to shut down.
The switch will auto reset once the temperature drops
sufficiently.
BLOWER AIR PRESSURE SWITCHES
The blower/heater is equipped with two air pressure
switches located in the junction box (see Figure 4, item
42 and item 45). These devices are connected in series
and monitor the air pressure produced by the blower. In
the event that the exhaust venting becomes blocked or
sufficiently restricted, the normally open (NO) air pressure
switch will shut down the heater. In the event that the
intake pipe becomes sufficiently blocked or restricted, the
normally closed (NC) air pressure switch will shut down
the heater.
LOCATING THE NEW WATER HEATER
FACTS TO CONSIDER ABOUT THE LOCATION
Carefully choose an indoor location for the new water
heater because the placement is a very important
consideration for the safety of the occupants in the building
and for the most economical use of the appliance. This
water heater is not for use in manufactured (mobile) homes
or outdoor installation.
Whether replacing an old water heater or putting the water
heater in a new location, the following critical points must
be observed:
1. Select a location indoors as close as practical to
the vent termination or location to which the water
heater vent piping is going to be connected, and as
centralized with the water piping system as possible.
2. Selected location must provide adequate clearances
for servicing and proper operation of the water heater.
3. Avoid locations that could cause the water heater to
freeze from outside air.
4. Selected location must provide access to a properly
grounded electrical branch circuit. A dedicated circuit
is preferred. Do not use a GFI outlet.
5. Avoid locations that expose the water heater to direct
sunlight.
6. Keep combustibles such as boxes, magazines,
clothes, etc., away from the water heater area.
Important: Do not use an extension cord to connect the
water heater to an electrical outlet.
• All water heaters eventually leak.
• Do not install without adequate drainage.
Property Damage Hazard
CAUTION
Installation of the water heater must be accomplished in
such a manner that if the tank or any connections should
leak, the flow of water will not cause damage to the
structure. For this reason it is not advisable to install the
water heater in an attic or upper floor. In all cases, a metal
drain pan should be installed under the water heater. Metal
drain pans are available at your local hardware store. Such
a metal drain pan must have a clearance of at least 1”
greater than any point on the water heater’s outer jacket
and must be piped to an adequate drain. The pan must
have a maximum depth of 1.75”.
Water heater life depends upon water quality, water
pressure 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 metal 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 metal 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 metal drain pan that trigger an
alarm or turn off the incoming water to the water heater
when leakage is detected.
• Sensors mounted in the metal drain pan that turn off
the water supply to the entire building when water is
detected in the metal 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.

14 www.statewaterheaters.com 100328750_2000585219_Rev. 01
Read instruction manual before
installing, using or servicing
water heater.
• Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
• Avoid all ignition sources if you smell gas.
• Do not expose water heater control to excessive gas
pressure.
• Use only gas shown on rating plate.
• Maintain required clearances to combustibles.
• Keep ignition sources away from faucets after extended
period of non-use.
Fire or Explosion Hazard
WARNING
FLAMMABLE
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance. Storage 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.
Can result in serious injury or death
FIRE AND EXPLOSION HAZARD
Flammable Vapors
FLAMMABLES
WARNING
For continued protection against
risk of fire:
• Do not install water heater on
carpeted floor.
• Do not operate water heater if
flood damaged.
Fire Hazard
WARNING
Clearances To Combustibles
Minimum clearances between water heater and
combustibles are 0” at the sides and rear, 5.5” from the
front and 12” from top (standard clearance.) If clearances
stated on the heater differ from standard clearances, install
water heater according to clearances stated on the heater
(see Figure 10).
Floors With Carpeting
This water heater must not be installed directly on
carpeting. Carpeting must be protected by a metal or
wood panel beneath the appliance extending beyond
the full width and depth of the appliance by at least 3” in
every direction, or if the appliance is installed in an alcove
or closet, the entire floor must be covered by the panel.
Failure to heed this warning may result in a fire hazard.
Clearances For Servicing
When installing the heater, consideration must be given to
proper location. Location selected should be as close to
the wall as practicable and as centralized with the water
piping system as possible.
Servicing this appliance, such as changing the anodes,
etc. requires clearances for accessibility and replacement
of parts. The anode could be as long as 35”.
Refer to the current edition of the“National Fuel Gas
Code”, ANSI Z223.1/NFPA 54 for detailed requirements.
TOP VIEW
OF CLOSET
WITHOUT DOOR AIR
INTAKE*
TOP VIEW
OF CLOSET
WITH DOOR
0” MIN.
0” MIN. 0” MIN.
5.5” MIN.
* DO NOT BLOCK OR RESTRICT IN ANY MANNER,
THE AIR INTAKES AT THE BACK OF THE WATER HEATER.
Figure 10.
Breathing carbon monoxide can cause brain damage or death.
Always read and understand instruction manual.
• Install water heater in accordance with the
instruction manual and NFPA 54.
• To avoid injury, combustion and ventilation air
must be taken from outdoors.
• Do not place chemical vapor emitting products
near water heater.
Breathing Hazard - Carbon Monoxide Gas
WARNING
HIGH AMBIENT TEMPERATURE INSTALLATIONS
As the room temperature rises, the water heater venting
is exposed to high temperatures from the inside and the
outside. In these situations, attention to the choice of
venting material is necessary. Establishing the ambient
temperatures where the heater and the venting are
installed is very important. Areas that can experience
high ambient environments include closets, alcoves,
areas under staircases, attics (especially in metal roofed
buildings), areas with restricted air movement, rooms with
large solar gains, metal sheds, industrial or commercial
enterprises and venting systems exposed to direct
sunlight. Water heater installations in ambient conditions
hotter than 110°F require the installation of a high ambient
limit switch (kit number 100308923) and use of CPVC or
polypropylene venting material. Failure to install the proper
vent material will result in a non-compliant installation and
can result in deformation/breakage of the pipe.

100328750_2000585219_Rev. 01 www.statewaterheaters.com 15
Breathing carbon monoxide can cause brain damage or death.
Always read and understand instruction manual.
• Flue gases may escape if
vent pipe is deformed,
broken, or not properly
connected.
Breathing Hazard - Carbon Monoxide Gas
WARNING
Important Notes and Warnings
• This heater is certified to be installed using Schedule
40 PVC or CPVC or polypropylene plastic vent material.
Only use approved material. All venting material and
components must be joined with the approved primer/
cleaner and solvent cement.
• Do not common vent this heater with any other
appliance.
• During operation the plastic piping will expand as it
heats up and contract as it cools down. This is normal
for this type of venting. Rigidly fastening the vent piping
can cause undue stress that may result in the cracking
or fracturing the vent piping material. A fracture of the
venting pipe may pose a serious safety hazard. To
prevent stressing of the vent system, all hangers and
supports must allow the vent piping freedom to move.
• Use long sweep elbows wherever possible. Closely
coupled elbows and short radius elbows can reduce
the venting capacity.
• All power vented water heaters generate a certain
amount of operational noise. In order to minimize
noise transmission to the support structure, it is
recommended to use isolation pads between the pipe
hangers and the vent pipe.
• Most power vent installations develop some
condensation in the vent piping. When using long runs
of venting or when the venting passes through cold or
unheated areas, considerable amounts of condensate
from the flue gases can develop. Provision must be
made for the condensate to drain freely from the
system or to be collected in a condensate trap(s) that
can be drained. Damage or fracture of the vent piping
may occur if the condensate is allowed to collect and
freeze. Pooling of condensate can restrict airflow and
can cause nuisance failures of the system.
INSULATION BLANKETS
Insulation blankets are available to the general public for
external use on gas water heaters but are not necessary
with these products. The purpose of an insulation blanket is
to reduce standby heat loss encountered with storage tank
heaters. Your water heater meets or exceeds the current
standards with respect to insulation and standby loss
requirements, making an insulation blanket unnecessary.
Should you choose to apply an insulation blanket to
this heater, you should follow these instructions (For
identification of components mentioned below, see
Figure 1 thru Figure 5). Failure to follow these instructions
will restrict the air flow required for proper combustion and
dilution, 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 blower
assembly.
• Do not cover the outer door, thermostat or T&P relief
valve.
• Do not cover the “Installation And Operating manual”.
Keep it on the side of the water heater or nearby for
future reference.
• Do obtain new warning and instruction labels from the
manufacturer 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.
Breathing carbon monoxide can cause brain damage or death.
Always read and understand instruction manual.
• Do not obstruct water heater air intake(s) with
insulating jacket.
• Gas and carbcn monoxide detectors are available.
• Install water heater in accordance with the
instruction manual and NFPA54.
Breathing Hazard - Carbon Monoxide Gas
WARNING
AIR REQUIREMENTS
For safe operation an adequate supply of fresh,
uncontaminated air for combustion, dilution and ventilation
must be provided.
Note: Contaminated or dusty air may cause build-up on
the blower wheel resulting in nuisance shut downs.

16 www.statewaterheaters.com 100328750_2000585219_Rev. 01
INSTALLING THE NEW WATER HEATER
WATER PIPING
To reduce the risk of unusually hot water reaching
the fixtures in the house, install Thermostatic Mixing
Valves (see Figure 6) at each point-of-use.
Water temperature over
125°F can cause severe
burns instantly resulting in
severe injury or death.
Children, the elderly and the
disabled are at highest risk
of scald injury.
Feel water before bathing or
showering.
Temperature limiting devices
such as mixing valves must
be installed when required
by codes and to ensure safe
temperatures at fixtures.
BURN
HOT
HOT
DANGER
The water supply pressure should not exceed 80 psi. If this
occurs, a pressure reducing valve with a bypass should be
installed in the cold water inlet line. This should be placed
on the supply to the entire house in order to maintain equal
hot and cold water pressures.
HOT WATER CAN SCALD:
Water heaters are intended to produce hot water. Water
heated to a temperature which will satisfy space heating,
clothes washing, dish washing, cleaning and other
sanitizing needs can scald and permanently injure you upon
contact. Some people are more likely to be permanently
injured by hot water than others. These include the elderly,
children, the infirm, or physically/mentally handicapped.
If anyone using hot water fits into one of these groups
or if there is a local code or state law requiring certain
temperature water at the hot-water tap, then you must take
special precautions. In addition to using lowest possible
temperature setting that satisfies demand of application,
to reduce the risk of scalding, install Thermostatic Mixing
Valves (temperature limiting valves) (see Figure 6) at each
point-of-use. These valves automatically mix hot and cold
water to limit the temperature at the tap.
SPACE HEATING AND POTABLE WATER SYSTEMS
This appliance has been design certified as complying
with American National Standard/CSA Standard for water
heaters and is suitable for combination water (potable)
heating and space heating but not space heating only
applications.
Toxic Chemical Hazard
WARNING
• Do not connect to non-potable water system.
Consult a Qualified Installer or Service Agency. Follow
manufacturer’s instructions for installation of valves.
Before changing the factory setting on thermostat, read
"Operating The Temperature Control System" section in
this manual.
• This water heater should not be connected to any
heating systems or components previously used with
a non-potable water heating appliance.
• All piping components connected to this unit for space
heating applications should be suitable for use with
potable water.
• Toxic chemicals, such as those used for boiler treatment
shall not be introduced into the potable water used for
space heating.
• If the space heating system requires water temperatures
in excess of 120°F, install a Thermostatic Mixing Valve
(see Figure 6) in the domestic (potable) hot water
supply at each point-of-use to limit the risk of scald
injury.
Note: Water piping and vent piping occupy the space
above the water heater. Plan the water piping to ensure
it does not cause interference with the vent piping (see
“Planning the Vent System”).
If this water heater is to be used to supply both space
heating and potable water, the instructions listed below
must be followed:
• Be sure to follow the manual(s) shipped with the air
handler or other type heating system.
• This water heater is not to be used as a replacement
for an existing boiler installation.
• Do not use with piping that has been treated with
chromates, boiler seal or other chemicals and do not
add any chemicals to the water heater piping.
• Pumps, valves, piping and fittings must be compatible
with potable water.
• A properly installed flow control valve is required to
prevent thermosiphoning. Thermosiphoning is the
result of a continuous flow of water through the air
handler circuit during the off cycle. Weeping (blow off)
of the temperature-pressure relief valve (T&P) or higher
than normal water temperatures are the first signs of
thermosiphoning.
• The hot-water line from the water heater should be
vertical past any mixing valve or supply line to the
heating system to remove air bubbles from the system.
• Do not connect the water heater to any system or
components previously used with non-potable water
heating appliances when used to supply potable water.

100328750_2000585219_Rev. 01 www.statewaterheaters.com 17
COMBO HEATING
This section serves as a guide for the installation and use
of “Combo” heating systems utilizing a domestic water
heater that has been specifically approved for such use.
It is written for those knowledgeable in the required trades
and professionals involved in the design and installation
of Combo Heating Systems.
It is the responsibility of the installer/designer to follow all
applicable codes to ensure the effectiveness and safety
of the installation.
System Requirements
The following requirements must be met for the installation
of Combo Heating Systems:
1. All components used for the distribution of water in
the heating loop must be suitable for potable water.
These include all piping, fittings, solder and fluxes,
pumps for circulation of water, valves, etc.
2. The water heater must not be connected to a hydronic
heating system that has been used previously.
3. No boiler treatment chemicals of any kind shall be
introduced into the system.
4. The Combo System components must be selected
and sized to meet and maintain the total calculated
demands for both domestic service hot water
and space heating requirement. The sizing and
installation must be performed in accordance with
good engineering practice such as “ASHRAE
Handbooks”, HRAI’s Unified Combo Guidelines,
“Hydronics Institute Manuals”, ANSI Z223.1, CSA
F280, National/Provincial Building Codes, ANSI
and/or codes having jurisdiction.
5. The air handler (fan coil) and/or the circulating pump
in a baseboard hydronic loop will require a dedicated
120V circuit. This must be provided and identified for
this purpose.
6. All piping between the water heater and the air handler
or hydronic baseboard loop must be adequately
insulated to reduce heat loss.
7. If the local jurisdiction requires a back-flow preventer
in the cold water line, an expansion tank of adequate
size must be installed.
8. “Combo” Heating Systems require higher water
temperatures than other applications. When the
system is used to supply water for Combo Heating
applications, a means, such as Thermostatic Mixing
Valves (see Figure 6) at each point-of-use, must be
installed to temper the water in order to reduce scald
hazard potential (see Figure 11 and Figure 12).
Installation
The heating mode may be one of the following options:
A. A fan coil/air handler (Figure 11).
B. A hydronic baseboard (finned tube) loop/In floor
heating (Figure 12).
The following is a list of requirements for the installation
of option A or B.
1. Install shut-off valves and unions so that the water
heater can be isolated from the heating module should
servicing of the water heater become necessary.
2. Install a drain valve at the lowest point of the heating
loop so that water can be drained from the heating
module without affecting the water heater.
3. If the air handler does not have a venting means at
the highest point of the piping arrangement, install
an air bleed at the highest point of the plumbing
arrangement.
4. Important: Install a spring loaded check valve in the
space heating return line to prevent cold water from
continuously entering the water heater. Failure to
install such a valve could cause “stacking” and cause
the T&P valve to open.
Note: This water heater is not equiped with Side Taps,
as shown, for "Combo" heating.
WATER
HEATER
HOT
OUTLET
EXPANSION TANK (OPTIONAL)
MIXING
VALVE
COLD
INLET
CHECK VALVE (IF USED
REQUIRES EXPANSION TANK)
COLD SUPPLY
HOSE BIB
(OPTIONAL)
FLOW
CONTROL
SUPPLY
RETURN
EXTERNAL
CIRCULATOR
AIR
HANDLER
HOT WATER
TO HOUSE
FIXTURE
C
H
M
INTERNAL
CIRCULATOR
DRAIN/
PURGE
VALVE
SPRING
LOADED
CHECK
VALVE
(see also
Massachusetts
code requirements
on page 7)
Figure 11.
WATER
HEATER
HOSE BIB
(OPTIONAL)
FLOW
CONTROL
SUPPLY
RETURN
EXTERNAL
CIRCULATOR
HYDRONIC
BASEBOARDS
(SERIES
CONNECTED
SHOWN)
HOT
OUTLET
EXPANSION TANK (OPTIONAL)
MIXING
VALVE
COLD
INLET
CHECK VALVE (IF USED
REQUIRES EXPANSION TANK)
COLD SUPPLY
HOT WATER
TO HOUSE
FIXTURE
C
H
M
SPRING
LOADED
CHECK
VALVE
(see also
Massachusetts
code requirements
on page 7)
Figure 12.

18 www.statewaterheaters.com 100328750_2000585219_Rev. 01
CLOSED WATER SYSTEMS
Water supply systems may, because of code requirements
or such conditions as high line pressure, among others,
have installed devices such as pressure-reducing valves,
check valves, and back flow preventers. Devices such
as these cause the water system to be a closed system.
THERMAL EXPANSION
As water is heated, it expands (thermal expansion). In a
closed system, the volume of water will increase. As the
volume of water increases, there will be a corresponding
increase in water pressure due to thermal expansion.
Thermal expansion can cause premature tank failure
(leakage). This type of failure is not covered under the
limited warranty. Thermal expansion can also cause
intermittent temperature-pressure relief valve operation:
water discharged from the valve due to excessive pressure
build up. The temperature-pressure relief valve is not
intended for the constant relief of thermal expansion. This
condition is not covered under the limited warranty.
A properly-sized thermal expansion tank should be
installed on all closed systems to control the harmful
effects of thermal expansion. Contact a plumbing service
agency or your retail supplier regarding the installation of
a thermal expansion tank.
Note: To protect against untimely corrosion of hot and cold
water fittings, it is recommended that di-electric unions or
couplings be installed on this water heater when connected
to copper pipe.
• Avoid water heater damage.
• Install thermal expansion tank if necessary.
• Do not apply heat to cold water inlet.
• Contact qualified installer or service agency.
Property Damage Hazard
CAUTION
METAL
DRAIN
PAN
FLOOR
DRAIN
HOT-WATER
OUTLET COLD-
WATER
INLET
UNION UNION
3/4” SWEAT
FITTING
3/4” SWEAT
FITTING
TEMPERATURE-
PRESSURE
RELIEF VALVE
DISCHARGE PIPE
(DO NOT CAP
OR PLUG)
6” MAX.
AIR GAP
DRAIN
VALVE
SHUT-OFF VALVE
SOME
COMPONENTS
NOT SHOWN
FOR CLARITY.
Figure 13.
Figure 13 shows typical attachment of water piping to the
water heater. The water heater is equipped with 3/4” NPT
water connections.
Note: If using copper tubing, solder tubing to an
adapter before attaching the adapter to the water heater
connections. Do not solder the water lines directly to the
water heater connections - it will harm the dip tube and
heat traps and damage the tank.

100328750_2000585219_Rev. 01 www.statewaterheaters.com 19
TEMPERATURE-PRESSURE RELIEF VALVE
•Temperature-pressure relief
valve must comply with ANSI
Z21.22-CSA4.4 and ASME
code.
•Properly sized temperature-
pressure relief valve must be
installed in opening provided.
•Do not plug, block, or cap the
discharge line.
•Failure to follow this warning
can result in excessive tank
pressure, serious injury or
death.
Explosion Hazard
WARNING
This water heater is provided with a properly rated/sized
and certified combination Temperature-Pressure Relief
Valve (T&P valve) by the manufacturer. The valve is
certified by a nationally recognized testing laboratory
that maintains periodic inspection of production of listed
equipment of materials as meeting the requirements for
Relief Valves for Hot Water Supply Systems, ANSI
Z21.22-CSA 4.4, and the code requirements of ASME.
If replaced, the new T&P valve must meet the requirements
of local codes, but not less than a combination temperature-
pressure relief valve rated/sized and certified as indicated
in the above paragraph. The new valve must be marked
with a maximum set pressure not to exceed the marked
hydrostatic working pressure of the water heater (150 psi)
and a discharge capacity not less than the water heater
BTU/hr input rate as shown on the water heater’s model
rating plate.
For safe operation of the water heater, the temperature-
pressure relief valve must not be removed from its
designated opening nor plugged. The T&P valve must be
installed directly into the fitting of the water heater designed
for the relief valve. Install discharge piping so that any
discharge will exit the pipe within 6” above an adequate
floor drain. Be certain that no contact is made with any
live electrical part.
The discharge opening must not be blocked or reduced
in size under any circumstances. Excessive length (over
30’), or use of more than four elbows can cause restriction
and reduce the discharge capacity of the valve.
No valve or other obstruction is to be placed between the
T&P valve and the tank. Do not connect discharge piping
directly to the drain unless a maximum of 6” air gap is
provided. To prevent bodily injury, hazard to life, or property
damage, the relief valve must be allowed to discharge
water in adequate quantities should circumstances
demand. If the discharge pipe is not connected to a drain
or other suitable means, the water flow may cause property
damage.
•Temperature-pressure relief valve discharge pipe
must terminate at an adequate drain.
Water Damage Hazard
CAUTION
T&P Valve Discharge Pipe Requirements:
• Must not be smaller than the pipe size of the relief
valve or have any reducing coupling installed in the
discharge line.
• Must not be capped, blocked, plugged or contain
any valve between the relief valve and the end of the
discharge line.
• Must terminate a maximum of six inches above a floor
drain or external to the building. In cold climates, it is
recommended that the discharge pipe be terminated
at an adequate drain inside the building.
• Must be capable of withstanding 250°F without
distortion.
• Must be installed to allow complete drainage of both
the valve and discharge line.
•Burn hazard.
•Hot water discharge.
•Keep clear of
temperature-pressure
relief valve discharge.
BURN
HOT
HOT
DANGER
It is recommended to manually operate the T&P valve at
least once a year. Caution should be taken to ensure (1) no
one is in front of or around the outlet of the discharge line,
and (2) the water manually discharged will not cause any
bodily injury or property damage because the water may
be extremely hot. If after manually operating the valve, it
fails to completely reset and continues to release water,
immediately close the cold-water inlet to the water heater,
follow the draining instructions in this manual, and replace
the temperature-pressure relief valve with a properly rated/
sized new one.

20 www.statewaterheaters.com 100328750_2000585219_Rev. 01
Note: The purpose of a temperature-pressure relief valve
is to prevent excessive temperatures and pressures in the
storage tank. The T&P valve is not intended for the constant
relief of thermal expansion. A properly sized thermal
expansion tank must be installed on all closed systems to
control thermal expansion, see "Closed Water Systems"
and "Thermal Expansion" sections.
Temperature-Pressure Relief Valve And Pipe
Insulation
The T&P valve installed on this water heater is covered by
insulation to minimize heat loss. The insulation has a hole
on the bottom side to accommodate the valve outlet and
allow for the piping connection. Do not restrict the outlet
opening of the T&P valve.
T&P Relief Valve
T&P Relief Valve
Drain Line
Manual Relief Lever
T&P Relief Valve Insulation
(Outlet opening on underside)
Figure 14.
Locate the temperature and pressure relief valve on the
water heater (also known as a T&P relief valve). See
Figure 14.
1. Locate the slit running the length of the T&P relief
valve insulation.
2. Spread the slit open and fit the insulation over the T&P
relief valve. See Figure 14. Apply gentle pressure to
the insulation to ensure it is fully seated on the T&P
Relief Valve. Once seated, secure the insulation with
duct tape, electrical tape, or equivalent. Important:
The insulation and tape must not block the discharge
opening or hinder access to the manual relief lever
(Figure 14). Ensure a discharge pipe is installed into
the T&P valve discharge opening per the instructions
in this manual.
3. Locate the hot water (outlet) and cold water (inlet)
pipes to the water heater.
4. Locate the slit running the length of a section of pipe
insulation.
5. Spread the slit open and slip the insulation over the
cold water (inlet) pipe. Apply gentle pressure along
the length of the insulation to ensure it is fully seated
around the pipe. Also, ensure the base of the insulation
is flush with the water heater. Once seated, secure the
insulation with duct tape, electrical tape, or equivalent.
6. Repeat steps 4 and 5 for the hot water (outlet) pipe.
7. Add additional sections of pipe insulation as needed.
HIGH ALTITUDE INSTALLATION
Breathing carbon monoxide can cause brain damage or death.
Always read and understand instruction manual.
•For operation above 10,100 ft.
a high altitude orifice must be
installed.
•Contact a qualified installer or
service agency.
Breathing Hazard - Carbon Monoxide Gas
WARNING
This heater is approved for operation at elevations up
to, and including, 5,400’ without alteration. The heater
requires a "Hi-Altitude Kit" (P/N 100308933) for operation
at elevations above 5,400' but below 10,100'.
Failure to replace standard orifice with a high altitude orifice
when installed above 10,100’ could result in improper and
inefficient operation of the appliance, producing carbon
monoxide gas in excess of safe limits, which could result
in serious injury or death. Contact your gas supplier for
any specific changes which may be required in your area.
GAS PIPING
• Do not use water heater with
any gas other than the gas
shown on the rating plate.
• Excessive pressure to gas
control valve can cause serious
injury or death.
• Turn off gas lines during
installation.
• Contact qualified installer or
service agency.
Fire and Explosion Hazard
WARNING
Explosion Hazard
Have a qualified technician make sure that the L.P.
gas operating pressure does not exceed 13" water
column.
Failure to do so can result in death, explosion, or
fire.
WARNING