Bradford White EVERHOT IGI-180R Series Supplement

Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance.
Do not touch any electrical switch; do
not use any phone in your building.
Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
If you cannot reach your gas
supplier, call the fire department.
Installation and service must be
performed by a qualified installer,
service agency or gas supplier
WARNING: If the information in
these instructions is not followed
exactly, a fire or explosion may
result causing property damage,
personal injury or death
BRADFORD WHITE EVERHOTTANKLESS GAS WATER HEATER
FOR INTERIOR INSTALLATION
IGI-180R AND IGI-180C MODEL SERIES
INSTALLATION AND OPERATING INSTRUCTION MANUAL
PLACE THESE INSTRUCTIONS ADJACENT TO WATER HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE
Ambler, PA 19002
Tech. Service [phone]
Service Part [phone]
Warranty Service [phone]
Part No.: 238-44958-00C Rev. 7/07
A Spanish language version of these instructions is available by
contacting the company listed on the rating plate.
La versión espãnola de estas instrucciones se puede obtener al
escribirle a la fábrica cuyo nombre aparece en la placa de
especificaciones.

2
This water heater has a limited warranty. The warranty for this water heater is valid only if the
water heater has been installed, maintained and operated in accordance with these instructions.
NOTICE
SECTION I: IMPORTANT INFORMATION
TABLE OF CONTENTS
I IMPORTANT INFORMATION 2 VII GAS CONNECTIONS 40
II SPECIFICATIONS 6 VIII ELECTRICAL CONNECTIONS 42
III GENERAL INFORMATION 9 IX OPERATING INSTRUCTIONS 49
IV INSTALLATION INSTRUCTIONS 10 TEMPERATURE ADJUSTMENT 51
V WATER CONNECTIONS 12 X MAINTENANCE 56
VI VENTING 20 XI PARTS LIST 60
This gas-fired water heater is design certified by CSA International under the American National
Standard, Z21.10.3 (as indicated on the rating plate) and CAN/CGA 4.3-M (as indicated on the rating
plate) available from CSA Standards Association, 178 Rexdale Blvd., Etobicoke, Ontario, Canada
M9W 1R3.
This water heater must be installed in accordance with local codes. In the absence of local codes, it
must be installed in compliance with the National Fuel Gas Code (ANSI Z223.1-Latest Edition), or in
Canada CAN/CGA B149.1 Natural Gas Installation Code (Latest Edition) or CAN/CGA B149.2
Propane Installation Code (Latest Edition).
The following terms are used throughout this manual to bring attention to the presence of hazards at
various risk levels, or to important information concerning product life.
READ CAREFULLY
Indicates special instructions on
installation, operation or
maintenance, which are
important but not related to
personal injury hazards.
NOTICE
Indicates a potentially hazardous
situation, which, if not avoided,
could result in death, serious
injury or substantial property
damage.
WARNING
Indicates potentially hazardous
situation, which, if not avoided,
may result in moderate or minor
injury or property damage.
CAUTION
Indicates an imminently
hazardous situation, which, if not
avoided, will result in death,
serious injury or substantial
property damage.
DANGER

3
DO NOT store or use gasoline or other flammable, combustible, or corrosive vapors and/or liquids in
the vicinity of this or any other appliance.
Failure to properly install the vent and air intake (if applicable) system could result in property damage,
personal injury, or death.
DO NOT install any damaged venting system components. If damage is evident then please contact
the supplier where the water heater was purchased or the manufacturer listed on the rating plate for
replacement parts.
Use only vent terminals provided or factory authorized terminals for venting this water heater.
This water heater is equipped with an adjustable thermostat to control water temperature. Hot water
temperatures required for automatic dishwasher and laundry use can cause scald burns resulting in
serious personal injury and/or death. The temperature at which injury occurs varies with the person’s
age and the time of exposure. The slower response time of disabled persons increases the hazards to
them. NEVER allow small children to use a hot water tap, or to draw their own bath water. NEVER
leave a child or disabled person unattended in a bathtub or shower.
DANGER
Improper installation, adjustments, alteration, service or maintenance can cause property damage,
personal injury or loss of life. Failure to follow all instructions in the proper order can cause personal
injury or death. Read and understand all instructions, including all those provided with the appliance
before installing, starting-up, operating, maintaining or servicing this appliance. Keep this manual and
literature in legible condition with this water heater for reference by owner and service technician.
This water heater requires regular maintenance and service to operate safely. Follow the instructions
contained in this manual.
Installation, maintenance, and service must be performed only by a qualified, skilled and
knowledgeable installer or service provider.
Installation is not complete unless a pressure relief valve is installed into the proper location in the hot
water outlet piping of this water heater.
It is the responsibility of the installing contractor to see that all controls are correctly installed and are
properly operating when the installation is complete.
DO NOT operate this water heater without first being certain it is filled with water.
WARNING

4
DO NOT tamper with or alter the water heater and/or controls.
DO NOT operate water heater with jumpered or absent controls or safety devices.
DO NOT operate water heater if any external part has been under water. Immediately call a
qualified service agency to inspect the appliance and to replace any part of the control system
including gas controls, which has been under water.
DO NOT attempt to use this water heater with any gas other than the type listed on the rating
plate. Do not attempt to convert this water heater for use with a gas other than the type for
which it is equipped. Failure to use the proper gas can create an unsafe condition resulting in
property damage, bodily injury, or death. Consult your local gas supplier or gas company if
there are any questions.
DO NOT operate this water heater if the input rate exceeds the rate shown on the water heater
rating plate.
This water heater contains very hot water under high pressure. Do not unscrew any pipe fittings nor
attempt to disconnect any components of this water heater without positively assuring the water is cool
and is not under pressure. Always wear protective clothing and equipment when installing, starting up
or servicing this water heater to prevent scald injuries. Do not rely on the temperature gauges to
determine the temperature. Do not touch any components unless they are cool.
This water heater must be properly vented and connected to an approved vent system in good
condition. DO NOT operate water heater with the absence of an approved vent system. A clean and
unobstructed vent system is necessary to allow noxious fumes that could cause injury or loss of life to
vent safely and will contribute toward maintaining the water heater’s efficiency.
This water heater is for indoor installation only. The supplied venting system must be used to supply
outdoor air for combustion to the appliance.
This water heater requires its own separate venting system. DO NOT connect the exhaust vent into an
existing vent pipe or chimney.
Water heater materials of construction, products of combustion and the fuel contain carbon monoxide,
nitrogen oxides, aldehydes and/or other toxic or harmful substances which can cause death or serious
injury and which are known to the state of California to cause cancer, birth defects and other
reproductive harm. Always use proper safety clothing, respirators and equipment when servicing or
working nearby this water heater.
WARNING

5
Liquefied petroleum gases/propane gas is heavier than air and will remain at floor level if there is a
leak. Basements, crawl spaces, closets and areas below ground level will serve as pockets for
accumulation of leaking gas. Before lighting, smell all around the appliance area for gas. Be sure to
smell next to the floor.
IF YOU SMELL GAS:
DO NOT try to light any appliance.
DO NOT touch any electric switch; do not use any telephone in your building.
Immediately call your gas supplier from a telephone in another building. Follow the gas
supplier’s instructions.
If you cannot reach your gas supplier, call the fire department.
DO NOT OPERATE THE APPLIANCE UNTIL THE LEAKAGE IS CORRECTED!
WARNING
Flammable items, pressurized containers or any other potential fire hazardous articles must never be
placed on or adjacent to the water heater. Open containers of flammable material must not be stored or
used in the same room with this water heater.
DO NOT USE AN INSULATION BLANKET WITH THIS WATER HEATER. This water heater
meets or exceeds the ASHRAE/IES 90.1b (latest edition) standards with respect to insulation and
standby loss requirements.
WARNING

6
SECTION II: SPECIFICATIONS
Flow Rate vs Temperature Rise Curve for EVERHOTIGI Model Series
*Note: The maximum flow is based upon a minimum water pressure of 30 PSI
Max. Flow Rate @ Degree Temperature Rise
Model No.
Max.
Input
Rating
Btu/hr.
Min.
Input
Rating
Btu/hr.
Temp
Rise
40F 60F 80F 100F 120F 140F
IGI-180R-10N
IGI-180R-10X
IGI-180C-5N
IGI-180C-5X
180,000
15,000 Flow Rate
Gal/Min. 7.2 4.5 3.3 2.6 2.2 1.6
First
Hour
Supply
Gal/Hr.
432 270 198 156 132 96
Max. Flow Rate @ Degree Temperature Rise
Model No.
Max.
Input
Rating
kW/hr.
Min.
Input
Rating
kW/hr.
Temp
Rise
22C 33C 44C 56C 67C 78C
IGI-180R-10N
IGI-180R-10X
IGI-180C-5N
IGI-180C-5X
52.7
4.4 Flow Rate
Liters/
Min. 27.3 17.0 12.5 9.8 8.3 6.1
First
Hour
Supply
Liters/Hr 1638 1020 750 588 498 366

7
EVERHOTIGI Model Series Dimensions
Figure 1

8
SPECIFICATIONS
Dimensions (Inches) Height:
25 5/8”
(65.1 cm)
Width:
13 25/32”
(35 cm)
Depth:
8 13/16”
(22.4 cm)
Outside Vent
Connection:
5” dia.
(12.7 cm)
Venting
Height:
2 21/32”
(6.7 cm)
Above top of
cabinet
Clearances from
Combustible Materials: Top of water heater: 6” (15.2 cm), Front: 6” (15.2 cm), Sides: 2” (5.1 cm), Back: 0”, Floor: 12” (30.5 cm), Vent/Air Intake Connectors: 0”
Maximum/Minimum Gas
Input Rating, Btu/hr. 180,000 maximum / 15,000 minimum for both Natural and L.P. Gases.
Thermal Efficiency 84%
Minimum/Maximum Gas
Supply Pressures: Natural Gas: Minimum: 6.0” w.c., Maximum: 10.5” w.c. Propane Gas: Minimum: 10.0” w.c., Maximum: 13.5” w.c.
Manifold Gas Pressure Natural Gas: 3.7” w.c. maximum input, 0.8” minimum input
Propane Gas: 4.2” w.c. maximum input, 0.9” minimum input
Venting System Direct Vent, Power Vented, To be vented using specified coaxial vent
components
Temperature setting range: 98-160F, Residential models, 98-185F Commercial models with front
panel temperature control
Recommended Minimum
water supply pressure 20 PSI (50-80 PSI for maximum performance)
Maximum Water Supply
Pressure 150 PSI
Electrical Rating 120 volts, 60 Hz,
Electrical Consumption Normal operation: 75 watts, Anti-frost protection (when required): 100 watts
Ignition System Direct Spark Ignition
Water Flow Control Water flow sensor, microprocessor controlled water flow solenoid, bypass
solenoid
Noise Level 49 dbA
Weight 49 Lbs. (22 Kg)

9
SECTION III: GENERAL INFORMATION
FEATURES
The Bradford White EVERHOTIGI series tankless water heater is a high output, high efficiency
appliance, which heats the water continuously as hot water is being drawn for use. Unlike tank type
storage water heaters, this water heater does not store hot water. The burner operates whenever there is
a demand for hot water and is off when the hot water flow stops. Hot water is continuously supplied for
any length of time required, as long as the specified flow rates are not exceeded. There is no need to set
the temperature higher than required for sufficient capacity. The EVERHOT water heater has sufficient
capacity to supply several hot water faucets simultaneously. The hot water flow capability will be
dependent upon the temperature of the outlet water selected. More detail can be found at the beginning
of Section II, “Specifications” section in this Installation and Operating Instruction Manual. Your plumbing
professional should determine your hot water requirements before installing this water heater to be sure
the capacity is sufficient for your application.
The IGI series water heaters are designed to be installed on or near an outside wall for indoor
installation only. The water heater is compact (23 1/2” (59.7 cm) H x 13 5/8” (34.6 cm) W x 8”
(20.3 cm) D) and mounts on a wall using the supplied wall bracket. No floor space is needed and
the water heater can be mounted at a height convenient for servicing.
The weight is less than 50 pounds (23 Kg) and can be installed by 1 person.
The burners ignite within 3 seconds of water flow (1/2 gallon/minute (1.9 L/m) minimum) by direct
spark ignition. There is no standing pilot.
A variable speed combustion air blower forces the combustion air supply into the burner
compartment.
Direct vent design uses only outside air for combustion. The venting system is a coaxial design
requiring a single 5 1/4” (13.3 cm) hole through the outside wall or roof. Vent pipe fittings have
internal gaskets for a tight seal to prevent leakage of flue products and combustion air.
The burner flame is continuously monitored and modulated to match the heating requirements of
the water flow. Temperature and flow sensors continually monitor the water flow and outlet water
temperature and adjust the burner and combustion air blower to maintain temperature.
The IGI model series have a digital temperature control integrally mounted to project through the
front panel of the water heater. The outlet water temperature is adjustable from 98-160F for
residential models (IGI-180R series) or 98-185F for commercial models (IGI-180C series). The
front panel temperature control also displays fault codes if the water heater malfunctions to assist
with servicing the water heater. No installation is required for the main temperature control.
In addition to the main temperature controller, up to two optional additional temperature controls
are available on the residential models for setting the water temperature in the bathroom fixtures
with the same temperature range as the main control on the water heater.
The heat exchanger coil is provided with anti-freeze heaters for protection in cold climate
conditions to ambient temperatures as low as -30F (-34C). Drain solenoids should be installed
to drain the water heater in the event of a power failure.
The water heater is very quiet in operation.

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SECTION IV: INSTALLATION INSTRUCTIONS
CAUTION
If building cold water supply has a back-flow preventer, check valve or water meter with check valve,
provisions for thermal expansion of water in the hot water system must be provided.
WARNING
This water heater must be located in an area where leakage of the heat exchanger coil, water line
connections, or the pressure relief valve will not result in damage to the area adjacent to the water heater
or to lower floors of the structure. When such locations cannot be avoided, a suitable drain pan must be
installed under the water heater. The drain pan depth must be suitable for draining and collecting water,
and have a minimum length and width of at least four (4) inches (10.2 cm) measured from the jacket of
the water heater. The drain pan, as described above, can be purchased from your plumbing professional.
The drain pan must be piped to an adequate drain. The piping must be at least ¾ inch (1.9 cm) in
diameter and pitched for proper drainage.
WARNING
Pressure relief valve discharge piping must be piped near floor to eliminate potential of severe burns. Do
not pipe in any area where freezing could occur. Do not install any shut-off valves, plugs or caps to the
temperature and pressure relief valve or piping.
DANGER
Temperature setting should not exceed safe temperature at fixtures. See water temperature control
warning in the “Temperature Adjustment” section of this Installation and Operating Instruction Manual. If
higher preheat temperatures are necessary to obtain adequate booster output, add an ASSE approved
mixing valve for hot water supplied to fixtures.
WARNING
INSTALLATION OF THIS WATER HEATER REQUIRES ABILITY EQUIVALENT TO THAT OF A
LICENSED PLUMBER. PLUMBING, AIR SUPPLY, VENTING, GAS SUPPLY AND ELECTRICAL
WORK ARE REQUIRED.
DO NOT ATTEMPT TO LIGHT ANY GAS APPLIANCE IF YOU ARE NOT CERTAIN OF THE
FOLLOWING:
Liquefied petroleum gases/propane gas and natural gas have an odorant added by the gas
supplier that aids in detection of the gas.
Most people recognize this odor as a “sulfur” or “rotten egg” smell.
Other conditions, such as “odorant fade” can cause the odorant to diminish in intensity, or
“fade”, and not be as readily detectable.
If you have a diminished sense of smell, or are in any way unsure of the presence of gas,
immediately contact your gas supplier from a telephone in another building.
Gas detectors are available. Contact your gas supplier or plumbing professional for more
information.
Liquefied petroleum gases/propane gas is heavier than air and will remain at floor level if there is a leak.
Basements, crawl spaces, closets and areas below ground level will serve as pockets for accumulation
of leaking gas. Before lighting, smell all around the appliance area for gas. Be sure to smell next to the
floor.
IF YOU SMELL GAS:
Do not try to light any appliance.
Do not touch any electric switch; do not use any telephone in your building.
Immediately call your gas supplier from a telephone in another building. Follow the gas
supplier’s instructions.
If you cannot reach your gas supplier, call the fire department.
D
O
N
O
T
O
PERATE THE APPLIAN
C
E
U
NTIL THE LEAKA
G
E I
S
CO
RRE
C
TED!

11
WARNING
UNPACKING
INSPECT SHIPMENT carefully for any signs of damage.
1. All equipment is carefully manufactured, inspected and packed.
2. Any claims for damage or shortage in shipment must be filed immediately with Bradford White
Corporation and noted on the Bill of Lading.
3. Open the vent kit carton (shipped separately) and inspect the venting components for damage.
WATER HEATER LOCATION:
1. The IGI series water heaters may be vented either horizontally through an outside wall or
vertically through the roof using the venting components designed for this water heater. Contact
your Bradford White supplier to order the required venting components. The venting system
should be as short as possible. Refer to the Venting System Installation section of this
Installation and Operating Instruction Manual for the vent terminal location restrictions before
choosing a final location for the water heater.
2. The water heater must be installed on a wall capable of supporting at least 50 pounds (23 Kg).
Locate the water heater at a height convenient for servicing and above the reach of small
children.
3. Minimum clearance to combustible material is 6” (15.2 cm) from the Top and Front, 0” from the
Rear, 2” (5.1 cm) from the Sides, 12” (30.5 cm) from the Bottom, and 0” from the Vent
Connectors of this water heater. However, it is recommended that at least 12” (30.5 cm) from the
top and 24” (61 cm) from the front be provided for servicing.
4. If the water heater is installed in a confined space, such as a closet, ventilation air must be
provided to prevent increased room temperature. Excessive ambient temperatures surrounding
the water heater may shorten the life of the controls.
REMOVE CARTON
Move water heater to a location near where it will be installed. Carefully slide water heater out
from the carton and remove all the contents.
MOUNT WATER HEATER ON THE WALL
Determine the proper height and location for the water heater to be installed. Consider the
venting system as well as the water and gas connections. Allow enough room for servicing the
water heater and maintain the clearances from combustible materials previously stated. The
water heater is supported on the wall by means of a top and bottom slotted angle bracket. For
convenience, the center hole of the bracket is slotted so that a center screw may be first installed
in the wall for hanging the water heater on the wall. Two more screws are then added on the
ends of the bracket to secure the water heater. Wall anchors should be used for the bracket
holes unless the bracket lines up with a stud. As an alternative, a suitable piece of plywood may
be cut to span the wall studs and the brackets fastened to the plywood. Make sure the anchors
are rated to support the 50 pound (23 kg) weight of the water heater.
WARNING
Residential models are suitable for potable water heating only. DO NOT use a
residential model water heater for space heating or combination space
heating/domestic water heating. Commercial models may be used for space
heating or combination space heating/domestic water heating. Refer to the
instructions for space heating in this Installation and Operating Instruction
Manual.
This water heater is not suitable for use in pool or spa applications.
The water heater must be installed indoors using the proper venting system
components for combustion air supply and discharging flue products to the
outdoors. Contact the supplier of this water heater or Bradford White for venting
components.
DO NOT operate this appliance without the vent piping connected.
All pipe joints should be taped to help prevent leakage around joints.

12
SECTION V: WATER CONNECTIONS
WARNING
Failure to install and maintain a new, listed pressure relief valve will release the manufacturer from
any claim, which might result from excessive temperature and pressures.
Keep clear of the pressure relief valve discharge line outlet. The discharge may be hot enough to
cause scald injury. The water is under pressure and may splash.
WARNING
DO NOT reverse the inlet and outlet (cold and hot water) connections on the water heater. This may
cause a hazardous operating condition or the water heater may be inoperable
WATER QUALITY
The EVERHOTwater heater must have the water quality within the following limits for long life and
reliable operation. The water supply should be tested to make sure the quality is within the specified
limits. If there is a problem with the water quality, contact your local water conditioning company for
equipment to condition the water supply to this appliance.
NOTICE
Operating this water heater with water conditions outside the specified limits will void the warranty.
Description pH TDS
(Total
Dissolved
Solids)
Total
Hardness Aluminum Chlorides Copper Iron Manganese Zinc
Maximum
Levels 6.5
to
8.5
Up to
500 ppm Up to 200 ppm
or 11.7
grains
hardness
Up to 0.2
ppm Up to 250 ppm Up to 1.0
ppm
Up
to
0.3
ppm
Up to 0.05
ppm Up to 5
ppm
Lime Condition Warning Signal:
If the EVERHOTwater heater is operated under hard water conditions without a water conditioner, the
error code “LC” may flash on the remote temperature display. This code means the heat exchanger coil
is beginning to accumulate scale deposits and MUST be flushed (see Section X, “Flushing Procedure for
Lime Scale Removal…”). Contact your installer for a qualified service technician to flush the heat
exchanger. A water conditioner may be needed to prevent this condition from reoccurring.
NOTICE
Failure to flush the appliance when “LC” is flashing will cause damage to the heat exchanger. Damage
caused by lime or scale build up is not covered by the water heater warranty.
INSTRUCTIONS FOR CONNECTIONS
1. BEFORE PROCEEDING WITH THE INSTALLATION, CLOSE THE MAIN WATER SUPPLY
VALVE. After shutting off the main water supply, open a faucet to relieve the water line pressure
to prevent any water from leaking out of the pipes while making the water connections to the
water heater. The COLD water inlet and HOT water outlet are identified on the bottom casing of
the water heater. Make the proper plumbing connections between the water heater and the
plumbing system to the house. All soldering materials and piping must be compatible with
potable water. Unions should be installed on both the hot and cold water lines for future servicing
and disconnection of the water heater. Install a shut-off valve in the cold water supply line.

13
2. In order to service the water heater in the event the heat exchanger needs to be flushed of lime
deposits, tee fittings with shut off valves and service connections to hoses should be installed.
Also install a shut off valve to the hot water supply to isolate the service tee fittings. A plumbing
installation kit, which includes these fittings and a pressure relief valve, is available from your
supplier. Refer to the piping diagrams (fig. 2-5) in Section V, “Water Connections”.
3. Install a pressure relief valve on a tee connection from the hot water outlet piping from the water
heater. Refer to the piping diagrams (fig. 2-5) and pressure relief valve warning in Section V,
“Water Connections”.
4. In cold climates where piping can freeze during an extended power failure, drain solenoid valves
should be installed on the cold and hot water supply lines to allow water to drain from the water
heater when power is interrupted. Refer to the piping diagram (fig. 4) “Recommended Piping for
Power Failure Freeze Protection” in Section V and contact your Bradford White dealer if
assistance is needed.
5. If this water heater is installed in a closed water supply system, such as the one having a back-
flow preventer in the cold water supply, provisions must be made to control thermal expansion.
DO NOT operate this water heater in a closed system without provisions for controlling thermal
expansion. Warranties do not cover damages from thermal expansions such as pressure bulges
and/or deformities. Your water supplier or local plumbing inspector should be contacted on how
to control this situation.
6. Purge the cold water line prior to connecting to the water heater to remove debris. Debris will
clog the mesh strainer of the inlet filter. The inlet strainer prevents debris from damaging the flow
sensor or clogging the coil. It may need to be cleaned periodically and should be cleaned after
the initial operation. DO NOT operate the water heater without the filter in place. In areas
where sediment may be periodically present in the water supply, a Y-type strainer (#20 mesh) or
cartridge filter should be installed on the cold water inlet to the water heater to prevent the water
heater fine mesh strainer from getting plugged and restricting water flow.
7. After installation of the water lines, open the main water supply valve and fill the water heater.
While the water heater is filling, open several hot water faucets to allow air to escape from the
water system. When a steady stream of water flows through the faucets, close them and check
all water connections for possible leaks.
8. This water heater may also be connected to a circulating pump or storage tank for increased flow
capacity during high demand periods. Refer to the suggested piping diagrams (fig. 3 & 5) in
Section V to be used as a guide.
9. Commercial installations may require more than one water heater piped together in a manifold to
supply enough capacity for high temperature and high water flow applications. Special controls
are available from your Bradford White supplier for operating more than one water heater
together. These controls stage the operation of the water heaters for the flow rates and control
the amount of flow through each water heater. Order part# 239-44511-00 for the electronic
manifold control for the first and second water heater and part# 239-44512-00 for the wiring
harness for each additional water heater to be controlled. Instructions are included with these
parts. Use the piping diagram in figure 5 in Section V as a guide.
NOTICE
Take care when using pipe dope or thread sealant tape to avoid clogging the inlet screen and water
flow sensor. Wipe off excess pipe dope from threads before connecting to the water heater.
Commercial dishwashers will require either more than one water heater, or a storage tank to supply a
sufficient volume of hot water.

14
Recommended Piping for a Basic Installation
Figure 2

15
Recommended Piping for a Circulation System
Figure 3

16
Recommended Piping for Power Failure Freeze Protection
As long as electrical power and gas are supplied to the EVERHOTwater heater, freeze protection is
provided to the heat exchanger and piping inside the water heater with ambient temperatures as cold as
-30F (-34C), when protected from direct wind exposure. In the event of a power failure with ambient
temperatures below freezing, the water heater must be drained of all water to prevent freeze damage.
The water heater may be drained manually, or automatically, through the installation of the optional
solenoid valves as shown in the following illustration. The drain solenoids are recommended for very cold
climates to prevent water heater freeze damage where power failures from ice and windstorms occur.
The electrical connections for the two solenoids must be tied to the 120 volt main power supply (black
and white wires). When the electrical power to the water heater fails, the ¾” solenoid on the cold water
inlet pipe closes, stopping water flow into the water heater. The drain solenoid opens, allowing the water
heater and connected piping to drain. Make sure the piping from the drain solenoid is run to a suitable
drain or outside the building to prevent water damage.
Figure 4

17
Recommended Piping for Back-up Storage System
For hotels, motels, and other high flow applications
Figure 5
Note: The Primary Circulator for the water heating loop must be sized for 21 GPM @ 35 Ft. Head.

18
PRESSURE RELIEF VALVE –
Keep clear of the pressure relief valve discharge line outlet. The discharge may be hot
enough to cause scald injury. The water is under pressure and may splash.
For protection against excessive pressure, install pressure protective equipment required by
local codes, but not less than a pressure relief valve certified by a nationally recognized
testing laboratory that maintains periodic inspection of production of listed equipment or
materials as meeting the requirements of the Standard for Relief Valves and Automatic Gas
Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22 and the Standard CAN1-4.4
Temperature, Pressure, Temperature and Pressure Relief Valves and Vacuum Relief Valves.
The pressure relief valve must be marked with a maximum set pressure not to exceed the
maximum working pressure of the water heater. The pressure relief valve rating must not be
less than the hourly rating of the water heater
Install the pressure relief valve into a tee connection from the hot water outlet of the water
heater.
Note: Some models may already be equipped or supplied with an installed pressure relief
valve. Verify that the pressure relief valve complies with local codes. If the pressure relief
valve does not comply with local codes, replace it with one that does. Follow the installation
instructions in the following paragraph.
Install a discharge line so that water discharged from the pressure relief valve will exit within
six (6) inches (15.2 cm) above, or any distance below the structural floor and cannot contact
any live electrical part. The discharge line is to be installed to allow for complete drainage of
both the combination temperature and pressure relief valve and the discharge line. The
discharge opening must not be subjected to blockage or freezing. DO NOT thread, plug or
cap the discharge line. It is recommended that a minimum clearance of four (4) inches (10.2
cm) be provided on the side of the water heater for servicing and maintenance of the
pressure relief valve.
Do not
p
lace a valve between the
p
ressure relief valve and the hot water outlet!
WARNING

19
COMBINATION WATER HEATING AND SPACE HEATING APPLICATIONS –
COMMERCIAL MODELS ONLY
Commercial models may be used for space heating or combination space heating/potable water heating applications provided
the following requirements and recommended piping diagrams are carefully followed.
WARNING
The following instructions must be carefully followed to assure safe and reliable operation of the water heater. All piping
components connected to this water heater must be suitable for use with potable water. In Massachusetts, space heating
piping length must not exceed 50 feet. Toxic chemicals, such as those used for boiler treatment, must not be introduced
into potable water used for space heating. This water heater must not be connected to an existing heating system or
component(s) previously used with a non-potable water heating appliance. When the system requires water for space
heating at temperatures higher than required for other means, an ASSE approved mixing valve must be installed to temper
the water for those uses in order to reduce the scald hazard potential.
1. Only commercial models may be used for combination water heating/space heating applications. Check the rating plate
label to make sure “C” is in the model number designation. Residential models will not be covered under warranty for
water heating/space heating applications.
2. The maximum heat output that can be delivered to the space heating heat exchanger is 36,000 Btu/hr.
3. The temperature setting of the water heater thermostat must not exceed 160F.
4. In combination space heating/potable water heating applications that require higher water temperatures than normally
used for potable water uses, an ASSE approved thermostatic mixing valve must be installed to temper the water for those
uses in order to reduce the scald hazard potential.
5. In order to assure adequate flow through the water heater, follow the recommended piping diagram and circulator
specifications (see Figure 6).
6. An expansion tank will be required in all space heating applications
7. A Y-type mesh strainer (#20 mesh screen) should be installed on the cold water inlet of the water heater to prevent
clogging of the fine mesh screen on the water heater cold water inlet connection.
8. A water softener must be used if the water supply has a tested hardness level above 10 grains of hardness.
9. All piping must be ¾” copper or larger.
10. All components must be suitable for use with potable water.
11. The water heater should be located as close as practical to the space heating heat exchanger.
12. A check valve should be located after the circulator(s) to prevent backflow during potable water demands.
13. A heat exchanger may be required to separate the potable water from the space heating circuit in certain applications.
Figure 6

20
SECTION VI: VENTING
WARNING
The venting system must be properly installed. Failure to properly install the vent system could
result in property damage, personal injury, or death.
DO NOT install damaged venting system components. If damage is evident then please contact the
supplier where the water heater was purchased or the manufacturer listed on the rating plate for
replacement parts.
Use only the vent terminals and vent/air intake components available for venting this water heater.
The water heater requires its own separate venting system. Do not connect the exhaust vent into an
existing vent pipe or chimney.
All vent pipe joints must be taped with aluminum tape to prevent leakage. Make sure all pipe
connections are firmly pressed together so that the gaskets make a tight seal.
All of the exhaust venting connections must be leak checked with a soap solution upon initial start up
of the water heater. Any leaks must be repaired before continuing operation of the water heater.
Do not terminate the venting where noise from the exhaust or intake will be objectionable. This
includes locations close to or across from windows and doors. Avoid anchoring the vent and intake
pipes directly to framed walls, floors, or ceilings unless rubber isolation pipe hangers are used. This
prevents any vibrations from being transmitted into the living spaces.
Do not exceed the venting distances or the number of elbows listed in this manual. Exceeding the
maximum venting distances may cause the water heater to malfunction or cause an unsafe
condition.
CAUTION
The vent shall terminate a minimum of 12 inches above expected snowfall level to prevent blockage
of the vent termination.
NOTICE
Before beginning installation of any vent pipe components, read the vent pipe manufacturer’s
installation instructions.
Water heater must be protected from freezing downdrafts, or drained during shutdown periods.
Provide protection of the building materials from degradation by flue gases from the exhaust vent
terminal.
VENTING
The venting instructions must be followed to avoid restricted combustion or recirculation of flue gases.
Such conditions cause sooting or risks of fire and asphyxiation.
This water heater is a direct vent design with a single coaxial vent tube in which the flue products are
discharged to the outdoors through the center flue tube and combustion air from outdoors is taken
through the outside intake air pipe surrounding the center flue exhaust pipe. All venting components are
ordered separately from the supplier of this water heater and must use the venting components designed
for the EVERHOTIGI series water heater. The EVERHOT standard horizontal vent kit available for this
water heater consists of one 90horizontal discharge adapter and one horizontal vent termination kit.
These components are suitable for mounting on an outside wall. If longer venting distances are required,
additional venting components are available from the supplier of the water heater.
NOTICE
The minimum and maximum wall thickness for sidewall venting are: 4” (10.2 cm) Minimum, 20” (50.8
cm) Maximum.