Intellihot iE1 User manual

Operation & Installation Manual
iE1

Thank you for purchasing this Intellihot unit.
This unit is designed for years of trouble free operation, and I urge you to read and follow the
instructions in this “Operation & Installation Manual.”
Our mission to create a better heating system began back in the winter of 2005 when a tank
water heater broke down and ooded my basement. By combining the principles of a diesel
engine’s robustness, robotics intelligence, and marine environment durability, we set out to
design a unit from the ground up that would outperform and outlast all others.
Quickly, our goal grew from not just making a better water heater, but creating an intelligent
water heating and delivery system. Innovation is our hallmark and simplicity, eciency, and
durability are at the core of every lntellihot product.
Our products are proudly engineered and built in Galesburg, Illinois. lntellihot has helped
commercial customers throughout the nation save thousands of dollars while eliminating
downtime. Our talented team of dedicated professionals is ready to assist you and help your
business succeed.
I thank you for purchasing our lntellihot products.
Sincerely,
Sri Deivasigamani
CEO, lntellihot Inc.

Table of Contents
1. General Information
1.1 Items Shipped With Water Heater..........5
1.2 Serial Number Plate Locations ............5
2. Safety
2.1 Safety Signal Words.....................6
2.2 Installation Warnings ....................6
3. TechnicalSpecications
3.1 SpecicationsChart ....................8
3.2 Nomenclature..........................9
3.3 ClearanceRequirements .................9
3.4 ConnectionSpecications ................9
3.5 Overall Dimensions..................... 10
3.6 CongurationOptions .................. 12
3.6.1 iE11UnitConguration ............ 12
3.6.2 iE12UnitsConguration........... 13
3.6.3 iE13UnitsConguration........... 14
4. Quick Reference Installation Guide
4.1 Install the Water Heater................. 15
4.2 Startup Instructions.................... 15
5. Preparation Before Installation
5.1 Selecting an Installation Site . . . . . . . . . . . . . 16
5.2 Outdoor Installation .....................17
5.3 RoomSizeRequirements ................17
6. Water Connections
6.1 QuickReferenceInstallationInstructions ... 18
6.2 HotWaterConnection .................. 19
6.3 ColdWaterConnection .................20
6.4 ColdDrainConnection ..................20
7. Electrical Power
7.1 ElectricalRequirements................. 21
7.2 Power Supply ......................... 21
7.3 CircuitBreaker ........................ 21
7.4 ConnectionInstructions.................22
7.4.1 Wire Gauge .....................22
7.4.2 AdditionalCircuitBreakerInstallation. 22
7.4.3 WireRouting ....................23
8. Operations
8.1 Unit Overview ........................24
8.1.1 Start Page – Temperature Setting ...24
8.1.2 Error Page ......................24
8.1.3 Main Page – Menu Options......... 24
8.1.4 FLOW/TEMP....................25
8.1.5 telliCare ........................25
8.1.6 Life............................25
8.1.7 UNITINFO–ContactInformation ...26
8.1.8 HISTORY .......................26
8.1.9 SETTINGS ......................26
8.1.10 TIME/DATE .....................26
8.1.11 SECURITY ...................... 27
8.1.12 MODE ......................... 27
8.1.13CTA-2045 ...................... 27
8.1.14CASCADING .................... 27
8.1.15BMS–BuildingManagementSoftware28
8.2 Turning Water Heater ON and OFF ........28
8.3 Adjusting the Water Temperature .........28
9. Multi-unit Setup
9.1 General Information ....................30
9.2 Installation Procedure ..................30
9.3 Updates .............................30
9.4 How Will It Work? .....................30
9.5 AutoDiscoveryNotication.............. 31
9.6 CascadingProcess..................... 31
9.7 OineCascading......................32
9.7.1 Cascading–Proposalexplanation ...32
9.8 Adding/RemovingUnits.................32
9.9 Cascade–Unabletosetup..............33
10. Maintenance
10.1 InletStrainerCleaning . . . . . . . . . . . . . . . . . . 34
10.2 FanGuardCleaning ....................34
10.3 Temperature-PressureReliefValveTest ...35
11. Wiring Diagrams and Troubleshooting
11.1 OperationalFlowChart.................36
11.2 Wiring Diagram........................36
11.3 Troubleshooting Guide..................38
11.3.1 TemperatureSensorOpen-Upper
ThermalBatteryError ..................38
11.3.2TemperatureSensorShorted-Bottom
ThermalBatteryError ..................38
11.3.3TemperatureSensorisOutofRange-
BottomThermalBattery ...............38
11.3.4HeatExchangerValveFault ........39
11.3.5BypassValveFault ...............40
11.3.6 Float Switch Failed ..............40
11.3.7BypassValveFault ...............40
12. Serviceable Parts
12.1 Display .............................. 41
12.2 CTA2045 ............................ 41
12.3 Electronics ........................... 41
12.4 ColdSide ............................42
12.5 ColdSide ............................42
12.6 ColdSide ............................43
12.7 Glycol Side ...........................43
12.8 Glycol Side ...........................44
12.9 Tank ................................44
12.10 Heat Pump ...........................44
12.11 Miscellaneous ........................44
13. Warranty
13.1 Warranty General ......................45
13.1.1 Warranty Period .................45
13.1.2AllOtherPartsandComponents ....45
13.1.3ShippingCosts ..................45
13.2 DenitionofPotablewater ..............45
13.3 WaterHardnessCriteria ................45
13.4 NotCoveredbythisWarranty ............46
13.4.1 Warranty Limitations ..............46
13.5 HowtoMakeaClaim ...................46
14. Product Warranty
14.1 WarrantyRegistration .................. 47

This product complies with UL 60335-2-40/CSA 22.2 Electric Water Heater. For use as potable water heating
DANGER
To avoid product damage, personal injury, or even
possible death, carefully read, understand, and
follow all the instructions in this Installation &
Operation Manual before installing this product.
Improper installation, adjustment, alteration, or maintenance
can cause injury, loss of life, and/or property damage.
This water heater should be installed and serviced by a
qualified technician. The lack of proper service can result in a
dangerous condition.
This manual must remain with the water heater
Due to Intellihot’s policy of continuous product improvement
and technology, the design, technical specifications, or both
in this manual are subject to change without notice.
This manual contains safety information, installation
instructions, and maintenance procedures. It must be left
with the homeowner or placed near the water heater in a
noncombustible location. The customer should retain this
manual for future reference.
Contact Information
Call us, your dealer, first if you have any questions about this
product. We can help answer questions about installation,
operation, or if there are damaged or missing parts when
unpacking this unit from the shipping box.
Dealer Contact Information.
Electrical Shock Hazard - Do Not Touch
Electrical Shock Hazard
If the water heater becomes immersed in water up to or
above the level of the bottom of the element doors, the
heater should be examined by a qualified service agency
before it is placed in operation.
WARNING

5
1. General Information
1.1 Items Shipped With Water Heater
The items shown in the illustration are shipped loose with the
water heater.
1.2 Serial Number Plate Locations
The unit’s serial number is located on the right side of the
unit. Provide this serial number when inquiring about service
or warranty solutions.
Serial Number: ________________
Date of Installation: ___ / ___ / ______
Installation &
Operation Manual
Operation & Installation Manual
iE1

iE1 Safety 6
Aug2023-Revision00
2. Safety
2.1 Safety Signal Words
DANGER
Indicates an imminently hazardous situation which, if not
avoided, will result in death or serious injury. This signal word
is limited to the most extreme situations.
WARNING
Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury.
NOTICE
Indicates that equipment or property damage can result if
instructions are not followed.
SAFETY
INSTRUCTIONS
Safety instructions (or equivalent) signs indicate specific
safety-related instructions or procedures.
2.2 Installation Warnings
WARNING
DO NOT use this water heater for any purpose other than
heating water.
Read, understand, and follow the Installation & Operation
Manual, including all warnings and precautions, before
operating this water heater. If you do not follow these
instructions exactly, a fire, electric shock or explosion can
result, causing property damage, personal injury, or loss of life.
This manual must remain with the water heater.
This water heater must be installed by a licensed plumber,
orprofessionalservicetechnician.Installationbyunqualified
person(s) voids the warranty.
This water heater is designed for operations at outlet
temperature(s) not more than 170°F (77°C).
This water heater is suitable for use in potable water
applications. The cold and hot water fittings on the top of
the water heater MUST NOT be connected to any other
system.
WARNING
The water heater temperature is factory set to 120°F
(49°C). Hot water temperatures above 125°F can cause
severe burns instantly or death from scalds.
If the proposed water heater outlet temperature is to be set
above 125°F, installation of a thermostatically controlled
(ortemperature-limiting)mixingvalveisrecommendedfor
all hot water going to faucets/showers to avoid the risk of
scalding.
Examplesincludecommercialapplicationswhere140°F
(60°C)isoftenneeded.Alwayscheckthetemperatureof
the hot water before bathing, showering, washing, etc.
WARNING
ElectricalShockHazard-DoNotTouch
Turn OFF power at the branch circuit breaker serving the
water heater before performing any service.
Label all wires prior to disconnecting when performing
service. Wiring errors can cause improper and dangerous
operation
Verifyproperoperationafterservicing.
Failure to follow these instructions can result in personal
injury or death.
WARNING
This unit should not be operated by persons (including
children) with reduced physical, sensory, or mental
capabilities, or lack of experience and knowledge, unless
they have been given supervision or instruction. children
should be supervised and should not to play with the unit.
Verifythe power tothewater heater is turned off before
opening the control panel or performing any service
procedures.

7 iE1 Safety
Aug2023-Revision00
WARNING
Appliance shall be installed, operated and stored in a room with
a floor area larger than 3200 sq ft.
SAFETY
INSTRUCTIONS
DO NOT use this appliance if any part has been under water.
DO NOT overtighten fittings as damage may occur, causing
internal leakage.
The appliance should be located in an area where leakage
within the unit or at its connections will not result in damage to
the surrounding area. The manufacturer will not be responsible
for any damage resulting from leaking if adequate drainage is
not provided.
CAUTION
GroundingRequirement
This water heater must be grounded in accordance with
the National Electrical Code and/or local codes. These must
be followed in all cases. Failure to ground this water heater
properly may also cause erratic control system operations, and
incorrect water temperatures.
This water heater must be connected to a grounded metal,
permanent wiring system; or an equipment grounding
conductor must be run with the circuit conductors and
connected to the equipment grounding terminal or lead on the
water heater.

iE1 Technical Specifications 8
Aug2023-Revision00
3. Technical Specifications
3.1 Specifications Chart
Technical Data iE1 Std Specification iE1 Mid Specification iE1 Max Specification
Type Indoor / Outdoor, Floor Mounted
Power Source Electric
Supply Input Voltage 208 V AC, 60 Hz, 1Ph
Heating Output Up to 90,000 BTU/Hr.
COP Up to 4.2
Compressor Type Rotary
Safety Devices Pressure Switch, Thermal Cutout, Overheat Protection
Electric Input 3.4 kW 9.4 kW 15.4 kW
Current 17 Amps 46 Amps 75 Amps
Recommended Circuit Breaker 20 Amps 60 Amps 90 Amps
Resistive Heating Elements 0 1 2
Ambient Installation Temperature -10° to 110°F
Air Flow Requirement 3500 CFM
Outlet Water Temperature Range 100°F to 170°F
Temperature Stability +/- 4°F
First Hour Rating† 154 Gallons
Connectivity Cellular and Bluetooth
Operational Modes Efficiency, Hybrid, Electric, Self-learning
Grid Connectivity Via CTA-2045 module (customer supplied)/JA13/JA14
Refrigerant R744, CO2 refrigerant
Refrigerant Charge Quantity 3.52lbs (1.6 kg)
Refrigerant Max Allowable Pressure 2000 PSI (13.7 MPa)
Cascading Protocol Masterless, Up to 4 units
Noise Level Up to 55 dBA
Domestic Heat Exchanger Stainless Steel, 316L
Energy Storage Water-Propylene-Glycol based Thermal Battery
Water Inlet & Outlet Connections 1-1/2” NPT Female
Unit Dimensions H X W X D 72 in X 30 in X 30 in
Shipping Weight / Unit Weight 620 lbs. / 540 lbs.
Water Pressure Min / Max 30 PSI (0.21 MPa) / 160 PSI (1.1 MPa)
CLEARANCES
Back 24”
Front 30”
To p 30”
Sides 12”
Certifications Energy Star, NSF 372, UL 60355-2-40, CSA C22.2 and CTA-2045
Warranty 1 Year on Parts and Compressor, 3 Years on Thermal Battery
Note: Due to Intellihot’s policy of continuous product improvements the design and technical specifications are subjected to change without notice.

9 iE1 Technical Specifications
Aug2023-Revision00
3.2 Nomenclature
5
3
6
10
2
4
11
12 1
9
7
8
Item
No. Nomenclature Description
1Condensate Drain Drains the excess moisture buildup from
water heater
2High Voltage Port Port for high voltage connection
3Inlet Strainer Cleanout Removes debris from inlet water by
reducing tip clogging
4Low Voltage Port Port for low voltage connection
5Potable Water Inlet An inlet for drinking water supply to the
water heater
6Potable Water Outlet An outlet for drinking water supply from
the water heater
7Propylene Glycol Cold
Accessory Port Port to access cold propylene glycol
8Propylene Glycol Hot
Accessory Port Port to access hot propylene glycol
9Removable Rear Panel A panel that can be removed externally
10 Pressure relief valve
port Pressure relief valve port
11
Tank Overflow -
Thermal Battery Drain
Port
Draining port of thermal battery to
control the overflow of water in the tank
12 Tank Fill - Thermal
Battery Fill Port
Filling port of thermal battery to refill the
exhausted water in the tank
3.3 Clearance Requirements
Left Right
To p
Back
Front
Location Required Clearance
To p 30” (76.2 cm)
Back 30” (76.2 cm)
Sides 30” (76.2 cm)
Front 30” (76.2 cm)
Bottom 0” (0 mm)
3.4 Connection Specifications
Description Specification
Water Supply Inlet Connection 1-1/2” NPT Female
Heated Water Outlet Connection 1-1/2” NPT Female
Power Supply 208 V AC Power, 1 Ph, 60 Hz
Model iE1 Std iE1 Mid iE1 Max
Recommended
Circuit Breaker 20 Amps 60 Amps 90 Amps

iE1 Technical Specifications 10
Aug2023-Revision00
3.5 Overall Dimensions
1 9.69
[500.00]
5.09
[1 29.21 ]
21 .45
[544.80]
[7.94]
3.42
[86.90]
9.1 2
[231 .52]
30. 07
[763. 71]
70.25
[1 784.30]
32.75
[831 . 74]
32.1 0
[81 5.33]
32.1 5
[81 6.69]
Front
Panel
Front
Display
Removable
Side Panel
SIDE VIEW
FRONT VIEW
BOTTOM VIEW
Fork-lift
Channels
R0.31
6.50
[165.04]

11 iE1 Technical Specifications
Aug2023-Revision00
Portable Water Inlet
Strainer Clean Out
Propylene Glycol Hot
Accessory Port
Propylene Glycol Cold
Accessory Port
Condensate Drain
Thermo Battery
Drain Port
Glycol Concentration
Portable Water Outlet
Pressure Relief Port
Port Access
Removable Real Panel
Thermo Battery
Fill Port
REAR VIEW
REAR VIEW
High Voltage
Port
Low Voltage
Port
LOW VOLTAGE
PORT
HIGH VOLTAGE
PORT
45.67
[1160.00] 38.19
[970.00]
34.84
[885.00]
60.36
[1533.20]
62.36
[1584.00]
12.20
[310.00]
15.00
[381.00]
6.89
[175.00]
7.87
[200.00]
3.78
[96.00]
3.27
[83.00]
3.58
[91.00]

iE1 Technical Specifications 12
Aug2023-Revision00
3.6 Configuration Options
3.6.1 iE1 1 Unit Configuration
Isolation Valve
Check Valve
Pipe Coupling
Recirculation Pump
LEGEND
iE1 (1 UNIT)
NOTES:
1. This schematic is a suggested piping configuration.
2. Each unit comes installed with a Temperature & Pressure Relief Valve and a Wye Strainer.
3. Any additional requirements from local codes and ordinances shall supercede this diagram.
4. For pipe sizes and electrical requirements please refer to operation and installation manual.
Expansion Tank
Recirculation Line
Hot Water Fixtures
Cold Water Supply Water Hammer Arrestor
Hot Water Supply
Water Hammer Arrestor
Double Check Valve
Condensate Line
Temperature & Pressure Relief Valve
See Note #2
T&P Relief Valve
Battery Fill Line
Double Check Valve

13 iE1 Technical Specifications
Aug2023-Revision00
3.6.2 iE1 2 Units Configuration
Isolation Valve
Check Valve
Pipe Coupling
Recirculation Pump
LEGEND
iE1 (2 UNITS)
NOTES:
1. This schematic is a suggested piping configuration.
2. Each unit comes installed with a Temperature & Pressure Relief Valve and a Wye Strainer.
3. Any additional requirements from local codes and ordinances shall supercede this diagram.
4. For pipe sizes and electrical requirements please refer to operation and installation manual.
Expansion Tank
Recirculation Line
Hot Water Fixtures
Cold Water Supply Water Hammer Arrestor
Hot Water Supply
Water Hammer Arrestor
Double Check Valve
Condensate Line
Double Check Valve
Battery Fill Line
Temperature & Pressure Relief Valve
See Note #2
T&P Relief Valve

iE1 Technical Specifications 14
Aug2023-Revision00
3.6.3 iE1 3 Units Configuration
Isolation Valve
Check Valve
Pipe Coupling
Recirculation Pump
LEGEND
iE1 (3 UNITS)
No Storage
NOTES:
1. This schematic is a suggested piping configuration.
2. Each unit comes installed with a Temperature & Pressure Valve as well as a Wye Strainer.
3. Any additional requirements from local codes and ordinances shall supercede this diagram.
4. For pipe sizes and electrical requirements please refer to operation and installation manual.
Expansion Tank
Recirculation Line
Condensate Line Condensate Line Condensate Line
HOT WATER FIXTURES
Cold Water Supply Water Hammer Arrestor
Hot Water Supply
Water Hammer Arrestor
Double Check Valve

15 iE1 QuickReferenceInstallationGuide
Aug2023-Revision00
4. Quick Reference Installation Guide
4.1 Install the Water Heater
1. The installation must conform with these instructions
and the local code authority having jurisdiction and the
requirements of the power company. In the absence of
local codes, the installation must comply with the latest
editions of the National Electrical Code, NFPA 70 or the
Canadian Electrical Code CSA C22.1.
2. This installation requires Plumbing and electrical work. A
qualified service provider is required.
3. In California, this water heater must be braced or anchored
to avoid falling or moving during an earthquake.
4. Massachusetts Code requires this water heater to be
installed in accordance with Massachusetts 248-CMR
3.00:
5. If after reading this manual you have any questions or
do not understand any portion of the instructions, call
the number listed on the back cover of this manual for
technical assistance.
6. Select an installation location, for an interior or exterior
location refer to section “5. Preparation Before Installation”
on page 16.
7. Please make sure the clearance around the unit is met or
exceeded as per section “3.3 Clearance Requirements” on
page 9
8. Check the quality of the water to determine if additional
water treatment would be beneficial to the function and
efficiency of the water heater. For additional information
refer to section”5. Preparation Before Installation” on page
16.
9. Make all necessary water connections. For additional
information refer to section “6. Water Connections” on
page 18. Make sure shut-off valves are included on the
water inlet and water outlet.
10. Make all necessary electrical connections. as per section
“7. Electrical Power” on page 21
11. If connecting multiple units together, refer to “9. Multi-unit
Setup” on page 30.
12. Fill out the Warranty Card and return it to Intellihot.
13. For a copy of the card go to “13. Warranty” on page 45.
4.2 Startup Instructions
NOTICE
Before the initial startup operation of the iE1 Electric Water
Heater, make sure to bleed all the air that is present in the
water lines. Please see “6. Water Connections” on page 18.
CAUTION
Do not startup the water heater if there is no supply of water
to the water heater.
• The inlet water shut-off valve and the outlet water shut-
off valve must be in fully open position to release any air
trapped inside the water lines of the water heater.
• Make sure to gradually supply water through the water
inlet. Rapid supply of water through the water inlet may
cause damage to the water heater
1. Please refer to “3.2 Nomenclature” on page 9 to
identify and locate the items mentioned in the below
instructions.
2. Open the outlet water shut-off fully.
3. Gradually open the inlet water shut-off valve to allow the
water to slowly flow through the water lines of the water
heater. Please see Section 6.0 “Water Connections” on
page 16.
4. Gently lift the lever of the T&P valve and push it all the
way up to release any air present in the water lines of the
water heater.
5. Close the outlet water shut-off valve
6. Turn ON the water heater.
NOTICE
The display screen will switch on and display the progress
of charging the thermal battery tank and the water filling
through the thermal battery fill port. The charging time may
vary between a minimum period of 45 minutes to a maximum
period of 2 hours only.
CAUTION
Make sure the outlet water shut-off valve is closed until the
thermal battery tank is fully charged and the water in the tank
of the water heater is filled.
7. Gradually open the outlet water shut-off valve to allow
hot water to flow out from the water lines of the water
heater. Please see “6. Water Connections” on page 18
8. The water heater is ready for use.
NOTICE
The internal thermal battery will be automatically recharged
to fill or drain the water tank based on water consumption or
overflow respectively.
9. If any error code appears on the display screen, please
refer to “11.3 Troubleshooting Guide” on page 38.

iE1 PreparationBeforeInstallation 16
Aug2023-Revision00
5. Preparation Before Installation
Before the installation of the water heater, please read the
manual carefully to take all the necessary precautions.
5.1 Selecting an Installation Site
1. Select an applicable indoor or outdoor location for the
installation. Each installation is unique; therefore, take the
time to find the best location for your water heater.
2. In case of outdoor installation, please refer to section
“5.2 Outdoor Installation” on page 17
3. It is not recommended to install the water heater unit at
the building basement floor, unless or otherwise there is
sufficient air ventilation in that location.
NOTICE
If there is not outside air circulation in the room, the heat
pump will emit cold air and may cause the room temperature
to become colder.
Important: The water heater must have unrestricted airflow.
WARNING
The water heater should be in an area where leakage
of the connections will not result in damage to the area
adjacent to the heater or to lower floors of the structure.
4. Install the water heater close to water inlet, water drain
outlet and other water connections. Please refer to
section “6. Water Connections” on page 18.
5. To minimizes the length of water pipes used in plumbing
connections, install the water heater near locations that
use hot water, such as bathroom, kitchen, or laundry room
faucets. Please refer to section “6. Water Connections”
on page 18
6. Make sure to select the location of the unit that minimizes
the length of electrical connections. Please refer to
section “7. Electrical Power” on page 21.
7. If the distances are long or if the faucet or appliance
requires “instant” hot water, we recommend running
a recirculation line back to the water heater from the
farthest fixture.
8. Make sure the unit is not located in a busy location and is
located away from foot traffic.
NOTICE
Make sure the installation location must be free from any
corrosive elements in the atmosphere such as sulfur, fluorine,
and chlorine. In addition, excessive dust and lint affect the
operation of the unit.
WARNING
Water heaters are heat producing appliances. To avoid damage
or injury, there shall be no materials such as dust, debris,
chemical agents, or other flammable materials like gasoline
or paint stored or kept around the water heater unit location.
9. Allow sufficient clearances for the service and
maintenance access to water inlet, water outlet and the
drain connections of the water heater. Please refer to
the “6. Water Connections” on page 18 for allowable
clearances
10. The water heater produces non-acidic condensate,
water similar to an air conditioner’s condenser water.
This condensate water is safe to drain without using any
neutralizer. Please check with local plumbing code for
the proper drainage of this condensate water.
11. If the water heater will be installed where the ambient
temperature could fall below freezing temperature it is
recommended to insulate all the piping connection to
protect the water inlet, water outlet, condensate and all
other water connections from freezing.
WARNING
During extreme cold weather conditions and in case of power
failure, make sure to.
• Turn OFF the water heater
• Close the water inlet and outlet shut-off water valves and
Drain the unit completely.
Due to the extreme cold weather conditions and in case of a
power failure, the water inside the water unit may freeze and
may cause damage to the water heater. Damage caused by
freezing water will not be covered under the warranty of this unit.
12. Check the water quality.
a. Proper maintenance of the water heater is required to
ensure that the water meets EPA quality standards.
Refer to section “13. Warranty” on page 45
for quality standard requirements and additional
information.
b. If you suspect that your water is contaminated in any
way, discontinue use of the water heater, and contact
an authorized technician or licensed professional.
c. If the incoming water is known to have a high mineral
content or “hardness” (see table below and refer to
“13. Warranty” on page 45 for additional details),
water treatment is recommended upstream from the
water heater.

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Maximum Allowable Hardness (grains per gallon, gpg)
Unit
Setpoint
(°F)
Incoming Water Pressure (PSI)
30 40 50 60 80 100
100-119° 8 15 20 25 30 30
120-139° 5 11 15 20 27 30
140-159° 4 5 11 13 18 20
160-170° 3 4 10 12 15 17
13. Make sure the location meets all building code
requirements.
5.2 Outdoor Installation
Select a suitable exterior/outdoor location to install the water
heater. Please refer to “5.1 Selecting an Installation Site” on
page 16 .
This water heater must be installed by qualified and
authorized technicians only.
Before the installation of the water heater, please read the
manual carefully to take all the necessary precautions.
1. Air Ventilation: The water heater must be installed in
an area with sufficient atmospheric air ventilation on all
directions to the water heater.
2. Clearances: Allow sufficient clearances for the service
and maintenance access to water inlet, water outlet and
drain connections of the water heater. Please refer to the
section “3.3 Clearance Requirements” on page 9
3. Plumbing Connections: Make sure to perform all the
necessary plumbing connections as shown in Section “6.
Water Connections” on page 18
4. Electrical and Grounding Connections: Make sure
to perform all the necessary electrical and grounding
connections as shown in Section “7. Electrical Power”
on page 21. Make sure the water heater is properly
grounded.
5.
CAUTION
GroundingRequirement
This water heater must be grounded in accordance with
the National Electrical Code and/or local codes. These must
be followed in all cases. Failure to ground this water heater
properly may also cause erratic control system operations, and
incorrect water temperatures.
This water heater must be connected to a grounded metal,
permanent wiring system; or an equipment grounding conductor
must be run with the circuit conductors and connected to the
equipment grounding terminal or lead on the water heater.
5.3 Room Size Requirements
The recommended minimum space for installation should be
approximately 3200 sq. ft. This is an air source heat pump
water heater and uses heat from the surrounding air. In the
installation room, there must be an unrestricted airflow and
requires minimum of 3200 sq. ft. If this requirement is not
met, the water heater could operate in lower efficiency and
performance.
NOTICE
iE1 is an air source heat pump. If installed in a small room, the
air temperature room must be 65 deg F or higher to achieve
efficient heating. Otherwise, the iE1 might use more electricity
to heat water (based on the demand) and the room could
get colder soon. If installed in a smaller kitchen, the iE1 uses
kitchen’s hot air to heat the water.

iE1 WaterConnections 18
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6. Water Connections
CAUTION
This water heater must be installed by a licensed plumber,
or professional service technician. Installation by unqualified
person(s) voids the warranty
NOTICE
Since each installation is different, it is up to the installer to
route the water lines efficiently. The drawings shown here are
suggestions indicating the items needed for the installation
only.
A water-hammer arrestor shall be installed where quick-
closing valves are utilized. The Water-hammer arrestors shall
be installed in accordance with the water-hammer arrestor
manufacturer’s instructions.
CAUTION
Do not overtighten any fittings or connections as damage may
occur, and may cause internal or external leakage. Follow the
instructions given in this manual carefully to avoid any damage
to the water heater, fittings, or connections.
6.1 Quick Reference Installation Instructions
Hot Water Outlet Pipe
Isolation Valve
Hot Water Outlet Port
T&P Port
Pressure Relief Valve
Thermo Battery Drain Port
Condensate Drain Port
Drain
Cold Water Inlet Pipe
Isolation Valve
T Joint
Cold Water Inlet Port
Double Check Valve
Thermo Battery
Fill Port
6” or more Concrete
Base
6.1 Quick Reference Installation Instructions
Install the water heater on a concrete base with a minimum
height of 6 inches from the floor and connect the below
given items as shown in the above figure.
Pressure Relief Valve Installation
1. Connect a pipe to the pressure relief valve port.
2. Install the pressure relief valve (provided with the water
heater) to the T&P port.
Hot Water Pipe Connection
3. Connect a pipe to the hot-water outlet.
4. Install an isolation valve to the hot-water outlet pipe.
Cold Water Pipe Connection
5. Connect a pipe to the cold-water inlet.
6. Install one end of a T-joint to the cold-water inlet pipe.
7. Connect a pipe and Install a double check valve between
the other end of the T-joint and the thermal battery fill
port.
8. Connect a pipe and install an isolation valve to the last
end of the T-joint.
Drain Pipe Connections
9. Connect a pipe to the condensate drain port and route
the pipe to a nearby drain.
10. Connect a pipe to the thermal battery drain port and
route it to a nearby drain.
CAUTION
Any air trapped inside the water lines cause damage to the
water heater. Make sure the isolation valves at the hot-water
outlet pipe and cold-water inlet pipe are in fully open position
to release any air trapped inside the pipes lines or the water
heater.
Make sure to gradually supply water through the cold-water
inlet. Rapid supply of water cause damage to the water heater.
11. After the installation is completed, open the isolation valve
at the cold-water inlet to gradually fill water in the water
heater. Make sure the isolation valve at the hot-water
outlet pipe is in fully open position.
NOTICE
Make sure there is continuous water flow in the connections
of all the water pipe lines connected to the water heater.
Make sure there are no leakages found in the joints and
connections of all the water pipe lines connected to the water
heater.
12. Open the nearest faucet or sink connected to the water
heater and continue to drain the hot water until there is
no air trapped inside the water pipe lines connected to the
water heater.

19 iE1 WaterConnections
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6.2 Hot Water Connection
Hot Water Outlet Pipe
Isolation Valve
Hot Water Outlet Port
T&P Port
Pressure Relief Valve
Thermo Battery Drain Port
Condensate Drain Port
Drain
Cold Water Inlet Pipe
Isolation Valve
T Joint
Cold Water Inlet Port
Double Check Valve
Thermo Battery
Fill Port
6” or more Concrete
Base
6.2 Hot Water Connection
1. Install and connect the hot water pipe lines as shown in
the above.
NOTICE
The length of the hot water pipes should be as short as
possible to reduce heat loss and to supply hot water to the
fixtures quickly.
WARNING
To prevent adverse health issues, only materials such as pipes,
fittings, valves, solder, etc. that are approved for use in potable
water systems must be used.
2. Connect a 1-1/2” NPT coupler to the water heater’s hot-
water outlet port.
3. Install and connect the hot water outlet pipe to the 1-1/2”
NPT coupler.
4. Install a T-joint and connect one end of the T to the
thermal battery fill port with a double check valve in the
middle (as shown).
5. Install a 1-1/2” union connection.
6. Install the supplied 3/4” 150 PSI maximum pressure relief
valve, as required by your local in the designated pressure
relief valve port.
7. Following local building codes, install a 1-1/2” manual shut-
off valve with 1-1/2” NPT fittings.
WARNING
To prevent serious personal injury, do not install any shut-off
device between the water heater and the pressure relief valve.
This valve is designed to release abnormally high pressure
within the water heater in the event of a system problem.
The supplied pressure relief valve must be used and installed.
Do not install any restrictions or other valves before the
pressure relief valve.
8. Install and route a discharge pipe from the pressure relief
valve to within six inches of the floor and directed away
from walk ways or other appliances as shown in the image
given below.
Condensate Drain
Connection
6.4 Condensate Drain Connection
1. Route the relief valve to within six inches of the floor
to prevent injury in the event of a discharge.
2. Make sure the diameter of the pipe connected from
the pressure relief valve must be in the same size
of the pressure relief valve. Please see “3.5 Overall
Dimensions” on page 10
CAUTION
Do not use any reducers in the outlet pipe. Do not install any
valves, restrictions, elbows, or other blockages in the outlet
pipe.
NOTICE
If multiple water heaters are being installed, the diameter of
both the main cold-water pipes and the main hot water pipes
need to be sized by an engineering professional.
9. For multiple unit installations only: The outlet pipes must
not be connected together. Each pipe must be separately
routed to a suitable drain.
10. Make sure to follow the local building codes to connect
the water heater pipe lines to the building’s hot water
pipe connections as required.
NOTICE
To conserve energy, insulate all hot water pipes and recirculation
pipes.
SAFETY
INSTRUCTIONS
Do not insulate the pressure relief valve.
11. Make sure the water heater is turned OFF and release the
water to drain until there is no air trapped inside the water
pipe lines of the water heater
12. Test the water pipes for any leakage. Repair any leaks
immediately.

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6.3 Cold Water Connection
Hot Water Outlet Pipe
Isolation Valve
Hot Water Outlet Port
T&P Port
Pressure Relief Valve
Thermo Battery Drain Port
Condensate Drain Port
Drain
Cold Water Inlet Pipe
Isolation Valve
T Joint
Cold Water Inlet Port
Double Check Valve
Thermo Battery
Fill Port
6” or more Concrete
Base
6.3 Cold Water Connection
1. Install and connect the hot water pipe lines as shown in
the above given figure.
WARNING
To prevent adverse health issues, only materials such as pipes,
fittings, valves, solder, etc. that are approved for use in potable
water systems must be used.
SAFETY
INSTRUCTIONS
If the incoming water is known to have a high mineral content
or “hardness” (See “13. Warranty” on page 45), hardness
treatment is recommended upstream from the water heater.
When the water heater is installed in a closed loop recirculation
system, and if the cold water supply pipe has a back flow
preventer, then an expansion tank should be installed to allow
for water expansion. Expansion tank should be sized for the
application.
2. Install and connect the hot water pipe lines as shown in
the above given figure.
3. Connect a 1-1/2” NPT coupler to the water heater’s cold
water connection.
4. Install a T and connect one end of the T to the glycol fill
port with a double check valve in the middle.
5. Install a 1-1/2” union connection.
6. Following local building codes, install a 1-1/2” manual shut-
off valve with 1-1/2” NPT fittings.
NOTICE
Isolation valve kits can be used if incoming water treatment is
anticipated (such as a water softener) due to hardness levels
or heavy usage of the unit.
7. Make sure the water heater is turned OFF and release the
water to drain until there is no air trapped inside the water
pipe lines of the water heater.
8. Test the water pipes for any leakage. Repair any leaks
immediately.
6.4 Cold Drain Connection
SAFETY
INSTRUCTIONS
Do not drink the condensate water. The condenser of the
water heater produces condensate (water) as a normal
by-product of heating the water. It is advised to send this
water to the drain.
Pressure Relief Valve
Discharge Valve
Discharge Valve
1. Connect and Install a 3/4” hose to the hose connection
on the water heater as show in the below given figure.
NOTICE
It is recommended to have a drain of sufficient size to
accommodate accidental pipe breaks and other various
leaks that could occur due to normal wear and tear. The
manufacturer will not be responsible for any damage resulting
from leaking if adequate drainage is not provided.