Bradford White RE2H50S 1NCTT Series User manual

Heat Pump Water Heater
RE2H50S*-1NCTT
RE2H65T*-1NCTT
RE2H80T*-1NCTT
For your family’s comfort, safety, and
convenience we recommend this
water heater be installed and serviced
by a plumbing professional.
ECO 8424
Effective: Feb 2022
238-52169-00C 6/30
INSTALLATION & OPERATION INSTRUCTION MANUAL

Table of Contents
Page
General Information...........................................................................................3
Water Heater Capacity..............................................................................4
About the Control Panel...........................................................................5
Operational Modes....................................................................................6
Temperature Adjustment .........................................................................7
Installation Instructions.....................................................................................8
Minimum Required Clearances...............................................................11
Water Supply Connections ..............................................................................13
Electrical Connections .....................................................................................17
General Operation.............................................................................................19
Maintenance ......................................................................................................20
Anode Rod Maintenance and Service ....................................................23
Frequently Asked Questions (FAQ).................................................................25
Fault Codes .......................................................................................................26
Notes..................................................................................................................28
CONGRATULATIONS!
You have purchased one of the finest water heaters on the market today!
This installation, operation and instruction manual will explain in detail
the installation and maintenance of your new Heat Pump Water Heater.
We strongly recommend that you contact a plumbing professional for the
installation of this water heater.
We require that you carefully read this manual, as well as the enclosed
warranty, and refer to it when questions arise. If you have any specific
questions concerning your warranty, please consult the plumbing
professional from whom your water heater was purchased. For your
records we recommend that you write the model, serial number and
installation date of your water heater in the maintenance section in the
back of this manual.
This manual should be kept with the water heater.

3
General Information
READ ALL INSTRUCTIONS BEFORE USING THE APPLIANCE
For your safety, the information in this manual must be followed to minimize the risk of fire or
explosion, electric shock, and/or to prevent property damage, personal injury, or loss of life.
The warranty on this water heater is in effect only when the water heater is installed and operated in accordance
with local codes and these instructions. The manufacturer of this heater will not be liable for any damage
resulting from failure to comply with these instructions. Read these instructions thoroughly before starting.
This water heater must be installed in accordance with local codes. In the absence of local codes, install this
water heater in accordance with the latest edition of the National Electrical Code.
WARNING
Incorrect operation of this appliance may create a hazard to life and property and will nullify the warranty.
Do NOT use this appliance if any part has been submerged in water. The plumbing professional responsible
for the installation of this water heater should be contacted to inspect the appliance and to replace any part of
the control system, including thermostat(s), that has been submerged in water.
Make sure that the rating plate on the water heater is referenced for certainty that the correct voltage is being
supplied to the water heater.
A sacrificial anode(s) is used to extend tank life. Removal of any anode, except for inspection and/or
replacement, will nullify the warranty. In areas where water is unusually active, an odor may occur at the hot
water faucet due to a reaction between the sacrificial anode and impurities in the water. If this should happen,
an alternative anode(s) may be purchased from the supplier that installed this water heater This will minimize
the odor while protecting the tank. Additionally, the water heater should be flushed with appropriate dissolvers
to eliminate any bacteria.
IMPORTANT!
Before proceeding, please inspect the water heater and its components for possible damage. DO NOT
install any damaged components. If damage is evident, please contact the supplier where the water heater
was purchased, or the manufacturer listed on the rating plate for replacement parts.
For Installations in the State of California
For California installation this water heater must be braced, anchored, or strapped to avoid falling or moving
during an earthquake. 6 See instructions for correct installation procedures. Instructions may be obtained from
DSA Headquarters Office, 1102 Q Street, Suite 5100, Sacramento, CA 95811.
WARNING
If the water heater has been subjected to flood, fire, or physical damage, turn off power and water to
the water heater. Do NOT operate the water heater again until it has been thoroughly checked by qualified
service personnel.
•
Turn OFF power to water heater if it has been subjected to overheating, fire, flood, or physical damage.
•
Do NOT turn on water heater unless it is filled with water.
•
Do NOT turn on water heater if cold water supply shut-off valve is closed.
NOTE: Flammable vapors may be drawn by air currents from surrounding areas to the water heater.
WARNING
DO NOT store or use gasoline or other flammable, combustible, or vapors and liquids in the vicinity of
this water heater or any other appliance. Keep rags and other combustibles away.

4
General Information cont.-
Water Heater Capacity
Water Heater Capacity and Increasing Temperature Setpoint:
The water heater temperature setting strongly impacts the amount of usable hot water available for
showers and baths.
•Energy consumption/savings and efficiency testing of water heaters is performed according to the
Department of Energy (DOE) requirements specified at the date of manufacture.
•Safety regulations require a factory setting no greater than 125°F (52°C) for all new water heaters.
Therefore, if your old water heater was set to a hotter temperature than your new water heater with a
factory set setpoint of 120°F (49°C), the new water heater may seem to provide lower capacity than your
old water heater. This can be corrected by increasing the temperature setpoint.
•If more hot water capacity is desired, increasing the temperature from 120°F to 135°F (49°C to 57°C) will
enable the same tank of hot water to last about 25% longer, as less hot water is mixed in at the shower or
faucet.
•Increasing the water temperature setpoint may improve the cleaning performance of dishwashers and
washing machines.
•The user can adjust the temperature setting to meet their needs. Always read and understand the safety
instructions contained in the Installation and Operation Manual before adjusting the temperature setpoint.
Mixing Valves
•Mixing valves for reducing point-of-use water temperature by mixing hot and cold water in branch
water lines are commercially available. Contact a licensed plumber or the local plumbing authority
for further information.
Specifications
Capacity…………………………………...50/65/80 US gal
Tank Max Working Pressure………………………150 PSI
Water Temperature Set Point Range ………100˚F-140˚F
Electrical………………………...240/208 VAC 60 Hz 1-PH
Circuit Breaker………...25 Amp minimum recommended*
Upper Element Wattage 240/208 VAC …..…...4000/3004
Lower Element Wattage 240/208 VAC ..….…..4000/3004
*see branch circuit guide
Refrigeration System
Compressor…………………………………………...500 W
Refrigerant Charge (R134a)…....29.1/30.9 oz (50/80 gal)
Compressor LRA……………………...………………14.0A
Compressor RLA……………………...………………2.56A

5
General Information cont.-
About the Control Panel
Displaying Temperature Setpoint
The water heater control will display the
temperature setpoint anytime a button on the
control is pressed. After 30 seconds of
inactivity, the display will go blank. However,
the LED indicating the selected operation mode
will remain lit. To wake the control at any time
to see the temperature setpoint, press any
button on the control.
Turning on the Water Heater
There is no power button for this unit. Once the
water heater is wired and power is supplied, it
will be on. The display will show the current
water temperature setting and an LED will
illuminate, indicating the current operating
mode.
To comply with safety regulations, the controls
are factory preset to 120°F (49°C) and Hybrid
Mode. It is recommended that the unit be set to
Heat Pump (Only) Mode to maximize energy
savings. Operating in Hybrid Mode provides a
balance of energy savings and hot water use
convenience.
Reported energy consumption is based on
operating the unit in Hybrid Mode at required
Department of Energy (DOE) test conditions.
Operating at lower temperature settings or in
Heat Pump (Only) Mode will provide even
greater energy savings.
To Adjust the Temperature
Follow these steps:
1. Press the UP or DOWN arrow on the
control panel keypad to the desired
temperature.
2. Press ENTER to accept the new setting.
Note: To change between °F and °C,
press and hold MODE.
Control Features
Display
Displays the current temperature or the number of days for
vacation mode. To display setpoint if display has gone blank,
press any button.
Operating Modes
(see page 6 for description)
Vacation
(see page 6 for description)
Mode Selector
Press this button to toggle through the various heating modes.
Press and hold to switch between °F and °C.
Arrow Pads
Use these buttons to manually change the water temperature, or
to select days for Vacation Mode.
Enter Key
Use this button to confirm temperature setting following
adjustment.
Filter Reset
The filter is dirty and requires cleaning when the red light is
illuminated. Filter is located on top of the water heater. Press the
button and hold for 5 seconds to reset filter alarm.

6
General Information cont.-
Operational Modes
This water heater defaults to the Hybrid operating mode.
To select available modes listed below:
1. Press the MODE button until the LED next to the desired Operating Mode is illuminated.
In Hybrid Mode, the Electric (Only) Mode LED will flash anytime the heating elements are active, such as during
the initial recovery from a large draw. This is normal and does not indicate an operating issue.
Cold Climate Efficiency
The 10 year warranty heat pump water heater is compliant with the Tier 3 Advanced Water Heater Specification, v7.0
(formerly known as the Northern Climate Specification) and may qualify for rebates in some regions. 6yr only Tier 1
compliant). Compliance with the specification does not require a Cold Climate Efficiency (CCE) setting for models
produced after 2015 and as a result the CCE setting may not be available on your model. Check with your local utility for
available rebates and requirements. A ducting kit is available for use with your heat pump water heater if desired (see
www.bradfordwhite.com for ducting kit details). Ducting kits may be installed to achieve directed flow of inlet and outlet air
for heat pump operation, or to allow water heater installation in rooms less than 700 ft3(19.8 m3) or without louvered
doors, as specified in the installation instructions.
Heat Pump (Only) Mode—RECOMMENDED FOR MAXIMUM SAVINGS
Heat Pump (Only) is the most energy-efficient mode for this water heater. It takes heat from the surrounding air to heat
the water. It takes more time to heat the water in this mode, so it may not be sufficient if you have a high-demand
situation, such as a large household or company.
Hybrid Mode
Hybrid Mode combines the energy efficiency of Heat Pump (Only) with the recovery speed and power of the Electric
(Only) Mode in most water usage situations. Hybrid Mode will allow the unit to perform like a standard electric water
heater while providing significant energy savings.
NOTE: Energy Guide unit performance, energy consumption, and savings are based on non-ducted installations in Hybrid
Mode at required Department of Energy (DOE) test conditions. Operating in Heat Pump (Only) Mode may provide greater
savings in energy and operating costs than the claimed savings.
Hybrid Plus Mode
This mode may be necessary if the household has a higher-than-average water usage or the water heater is
undersized for the household water demands. In this mode, the water heater will use the electric heating elements
only when the water demand rate is high. When using the heating elements, the water temperature will recover at
a faster rate but it will use more energy to heat it. Unlike Electric (Only) mode, it will use the heating elements only
when needed, and use the heat pump when water demand rates are lower.
Electric (Only) Mode
Electric (Only) Mode uses only the upper and lower heating resistance elements to heat the water, stopping the
cool air discharge during heat pump operation. It takes less time to heat the water in this mode, but it is the LEAST
energy-efficient mode.
Follow these steps to set Electric (Only) Mode:
1. Select Electric (Only) Mode using the MODE button.
2. Input the total days to remain in Electric (Only) Mode using the UP arrow. The default is 3 days, maximum
is 99 days.
3. Press ENTER.
At the end of the selected time period, the unit will switch back to the previously selected more energy-
efficient mode.
Note:In this mode the green LED light will flash after 48 hours as an indication that the unit is not operating in the
most energy efficient mode. The unit will continue to operate in this mode and does not indicate an operating issue.

7
General Information cont.-
Vacation Mode
This feature is recommended when you will be away from the home for an extended period of time and hot water is
not needed. In this mode, the unit will reduce the water temperature setting to 50°F (10°C) and will use the most
efficient heating mode to conserve energy while the heater is sitting idle. The unit will automatically resume heating
one day before your return, so that hot water will be available.
To set Vacation Mode:
1. Select Vacation by pressing the MODE button.
2. Input the total number of days you will be gone by pressing the UP arrow. The default is 7 days, maximum
199, or the water heater will remain in Vacation Mode indefinitely by selecting “---”.
3. Press ENTER.
For example, if you will be gone 14 days, set Vacation Mode for 14 days using the steps above. The temperature
setting will automatically reduce to 50°F (10°C) for 13 days. At the end of the 13th day, the previous operating mode
and temperature setting will reset to ensure hot water is available upon your return.
Extended Shutdown Periods
If the water heater is to remain idle for an extended period of time, the power and water to the appliance should be
turned OFF and the water heater drained to conserve energy and prevent a buildup of dangerous hydrogen gas.
General Information cont.-
This unit has no power button. The power can only be shut off at the circuit breaker or disconnect
switch.
After a long shutdown period, the water heater’s operation and controls should be checked by qualified
service personnel. Make certain the water heater is completely filled again before placing it in operation.
WARNING
Hydrogen gas can be produced in a hot water system served by this water heater when there has been no
usage for a long period of time (generally two weeks or more). HYDROGEN GAS IS EXTREMELY
FLAMMABLE. To reduce the risk of injury under these conditions, it is recommended that the hot water
faucet be opened for several minutes at the kitchen sink before using any electrical appliance connected to
the hot water system. If hydrogen is present, there will probably be an unusual sound, such as air escaping
through the pipe, as the water begins to flow. There should be NO smoking or open flame near the faucet at
the time it is open.
For information on Service Mode Functions and Thermistors, reference the mini-manual for this model.

8
Temperature Adjustment
CAUTION
Increasing the thermostat setting above the preset temperature may cause severe burns and consume
excessive energy. Hotter water increases the risk of scald injury.
This water heater can deliver scalding temperature water at any faucet in
the system. Be careful whenever using hot water to avoid scalding injury.
Certain appliances, such as dishwashers and automatic clothes
washers, may require increased temperature water. By setting the
thermostat on this water heater to obtain increased temperature water
required by these appliances, you may create the potential for scald
injury. To protect against injury, you should install an ASSE approved
mixing valve in the water system. This valve will reduce the point of
discharge temperature by mixing cold and hot water in branch supply
lines. Such valves are available from the manufacturer of this water
heater or a local plumbing supplier. Please consult with a plumbing
professional.
Safety, energy conservation, and hot water capacity are factors to be
considered when selecting the water temperature setting of the water
heater. Water temperatures above 125°F can cause severe burns or
death from scalding. Be sure to read and follow the warnings outlined
on the label pictured below. This label is also located on the water
heater near the top of the tank.
The thermostat has been set at the factory to 120°F (49°C) to
reduce the risk of scald injury. This is the recommended starting
temperature setting, but it can be adjusted to any temperature
between 100°F and 140°F (38°C and 60°C).
To adjust the temperature, follow these steps:
1. Press the UP or DOWN arrow on the control
panel keypad to the desired temperature.
2. Press ENTER to accept the new setting.
Note: To change between °F and °C, press and hold MODE.

9
Temperature Adjustment cont.-
APPROXIMATE TIME/TEMPERATURE RELATIONSHIPS IN
SCALDS
120°F (49°C)
More than 5 minutes
125°F (52°C)
1½ to 2 minutes
130°F (54°C)
About 30 seconds
135°F (57°C)
About 10 seconds
140°F (60°C)
Less than 5 seconds
145°F (63°C)
Less than 3 seconds
150°F (66°C)
About 1½ seconds
155°F (68°C)
About 1 second
The chart shown above may be used as a guide in determining the proper water temperature for your home.
Water Heater Temperature Setpoint
The water heater temperature setting strongly impacts the amount of usable hot water available for showers
and baths.
•Energy consumption/savings and efficiency testing of water heaters is performed according to the
Department of Energy (DOE) requirements specified at the date of manufacture.
•Safety regulations require a factory setting of 120°F to 125°F (49°C to 52°C) maximum for all new
water heaters. Therefore, if the water heater is currently set at 130°F (54°C) or above and the new
water heater is installed with a factory set setpoint of 120°F (49°C), the new water heater may seem to
provide lower capacity than the existing water heater.
•The user can adjust the temperature setting to meet their needs.
•Always read and understand the safety instructions contained in the Installation and Operation Manual
before adjusting the temperature setpoint.
Installation Instructions
Local Installation Regulations
This water heater must be installed in accordance with these instructions, local codes, and utility company
requirements or, in the absence of local codes, the latest edition of the National Electrical Code. It is available
from some local libraries or can be purchased from the National Fire Protection Association, Batterymarch
Park, Quincy, MA 02169 as booklet ANSI/NFPA 70.
Power Requirements
Check the markings on the rating plate of the water heater to be certain the power supply corresponds to
the water heater requirements. Note:208V installations may experience lower recovery performance.
Locating the Water Heater
WARNING
Water heaters are heat producing appliances. To avoid damage or injury, there shall be no material stored
against the water heater and proper care shall be taken to avoid unnecessary contact (especially by
children) with the water heater.
UNDER NO CIRCUMSTANCES SHOULD FLAMMABLE MATERIALS, SUCH AS GASOLINE OR
PAINT THINNER BE USED OR STORED IN THE VICINITY OF THIS WATER HEATER OR ANY
LOCATION FROM WHICH FUMES COULD REACH THE WATER HEATER.
This water heater MUST be installed indoors out of the wind and weather.
The water heater should NOT be located in an area where leakage of the tank or connections will
result in damage to the area adjacent to it or to lower floors of the structure. Where such areas
cannot be avoided, it is recommended that a suitable catch pan, adequately drained, be installed
under the water heater.

10
Installation Instructions cont.-
The location of this water heater is to be installed is of utmost importance. Before installing this water heater,
consult the installation section of these instructions. After reading these installation and operating
instructions, select a location for the water heater where the floor is level and is easily accessible to a power
supply and water connections. The water heater and water lines should be protected from freezing
temperatures and highly corrosive atmospheres. Locate the water heater in a clean, dry area. It is
recommended that the water heater be located near the center of greatest hot water usage to prevent heat
loss through pipes.
Do NOT locate the water heater where water lines could be subjected to freezing temperatures. Locate
the water heater so that access panels and drain valves are accessible.
NEVER OPERATE THE WATER HEATER WITHOUT FIRST BEING CERTAIN IT IS FILLED WITH WATER.
Note: Before proceeding with installation, close the main water supply valve.
Water heater corrosion and component failure can be caused by the heating and breakdown of airborne
chemical vapors. Examples of some typical compounds that are potentially corrosive are: spray can
propellants, cleaning solvents, refrigerator and air conditioning refrigerants, swimming pool chemicals,
calcium or sodium chloride, waxes, and process chemicals. These materials are corrosive at very low
concentration levels with little or no odor to reveal their presence.
Note: Damage to the water heater caused by exposure to corrosive vapors is not covered by the
warranty. Do NOT operate the water heater if exposure has or will occur. Do NOT store any
potentially corrosive compounds in the vicinity of the water heater.
This water heater must be located in an area where leakage of the tank or water line connections and the
combination temperature and 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. Refer to Catch Pan Installation for more information (pg 12).
This unit is designed for any common indoor installation in a space with at least 700 ft3 (19.8 m3) including:
garage, utility room, attic, closet, etc. It can be installed in rooms smaller than 700 ft3 (19.8 m3) with the
installation of a louvered door, or two louvered sections (one at the top and one at the bottom of the door or
wall for airflow). A ducting kit is also available, for more information see www.BradfordWhite.com. Louvers
should have 240 in2(0.15 m2) of open airflow area or greater. Servicing the water heater requires proper
installation so that the air filter, covers, trim ring, and front panels can be removed to permit inspection and
servicing. Reference installation instructions found in this manual.
The heat pump operating range is 35°F to 120°F (2°C to 49°C). If the ambient temperature is outside of this
range, the heat pump will turn off and the electric elements will be used until the ambient temperature returns
to within the operating range.
Attic installations require access stairs and solid flooring with no exposed floor joists up to the
installation location.
Note: Moving the water heater or other appliances to provide service to the water heater is not covered
under warranty.
To comply with NSF requirements this water heater is to be:
a) Sealed to the floor with sealant, in a smooth and easily cleanable way, or
b) Installed with an optional leg kit that includes legs and/or extensions that provide a minimum clearance
of 6” beneath the water heater.
Note: For California installation 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 DSA Headquarters Office, 1102 Q Street, Suite 5100, Sacramento,
CA 95811.

11
Installation Instructions cont.-
Air Exchange Efficiency
Required and recommended minimum clearances listed in this Installation and Operations Manual are for the
optimum performance, efficiency, and serviceability of the water heater.
Installing the water heater in a manner that does not provide sufficient air exchange will result in increased
energy consumption. Ensure that the rear of the water heater is open and not discharged against a wall. A
ducting kit may be required in order to achieve optimum efficiency. Bradford White is not liable or responsible
for any additional energy consumption or warranty implications.
Note: If the air temperature in the installed location drops more than 15˚F (8˚C) during heating, air
circulation is insufficient for optimum operation. Utilize the ducting kit to direct cold exhaust air to another
location.
Recommended Clearances
NOTE: Installations in a confined space, or installations where the
recommended service clearances are not met, will lead to higher
power consumption (increased use of resistance heating elements
and/or heat pump efficiency reduction).
It is recommended to have a 7” (17.5 cm) clearance between
any object and the rear and right side of the water heater in the
event service is needed. A minimum 8” (20.3 cm) clearance
above the water heater to remove the filter for cleaning and for
service access, and clear access to the front of the water heater,
is recommended. Installations that require less than 7” (17.5 cm)
clearance on the right side or rear of the water heater for
earthquake straps are also acceptable (see Minimum Required
Clearances section below for more information). In these cases,
it is recommended to provide additional clearance on the
opposite side of the unit to allow for service access. The hot
and cold water plumbing and electrical connections must not
interfere with the removal of the filter.
If a separate ducting kit is purchased (refer to
www.bradfordwhite.com for ducting kit part number), additional
space is required above and to the rear of the water heater for
installation. Consult the ducting kit manual for specific
instructions. See www.bradfordwhite.com for details.
The clearances shown are recommended for optimal
performance (best possible efficiency) as well as adequate
service room. Reducing these clearances may impact the overall
performance compared to what is displayed on the water heater.
A ducting kit may need to be used – refer to the Service Manual
or ducting kit instructions for installation information.
Insufficient air exchange will result in increased energy
consumption levels.
8”
(20.3 cm)
7”
(17.8 cm)
Model appearance
may vary

12
Installation Instructions cont.-
Minimum Required Clearances
NOTE: Installations in a confined space, or installations where the recommended service clearances are not
met, will lead to higher power consumption (increased use of resistance heating elements and/or heat pump
efficiency reduction).
Corner Installation
Model RE2H50S Model RE2H65T & RE2H80T
Alcove Installation
Model RE2H50S Model RE2H65T & RE2H80T
T&P Valve
T&P Valve
Front of
Water Heater
Front of
Water Heater
T&P Valve
Front of
Water Heater
T&P Valve
Front of
Water Heater

13
Installation Instructions cont.-
Condensate Drain Connection
This unit has a condensate drain; therefore, a floor
or other drain no higher than 36 in (91.4 cm) above
the floor must be available. It must be in close
proximity to the water heater to allow for the
shortest possible drain line with minimal turns. The
drain must meet state and local codes. It is
important to install a ¾” FNPT fitting suitable for
either rigid or flexible drain line to the primary drain
port coming off the side of the unit. Diameter
reductions from a ¾” drain line are discouraged.
Ensure that the rigid or flexible drain line maintains a downward slope to allow for proper gravity drainage of
condensate to the drain and to allow for proper function of the condensate drain blockage sensor. If no drain is
available, then a common condensate pump with a capacity no less than 1 gallon/day (3.8 L/day) must be
purchased and installed. It is important to route the flexible or rigid drain line so that the discharge water cannot
contact live electrical parts or cause water damage.
Catch Pan Installation (if required)
Auxiliary catch pan MUST conform to local codes. Catch
pan kits are available from the distributor where the water
heater was purchased or any water heater supplier. The
catch pan should be at minimum 4 in (10.2 cm) larger than
the water heater base diameter. To prevent corrosion and
improve drain valve access it is recommended that the
water heater be placed on risers inside the catch pan.
Thermal Expansion
Determine if a check valve exists in the inlet water line. It may have been installed in the cold water line as a
separate backflow preventer, or it may be part of a pressure-reducing valve, water meter, or water softener. A
check valve located in the cold water inlet line can cause what is referred to as a “closed” water system. A cold
water inlet line with no check valve or backflow prevention device is referred to as an “open” water system. As
water is heated, it expands in volume and creates an increase in the pressure within the water system. This
action is referred to as thermal expansion.”
In an “open” water system, expanding water which exceeds the capacity of the water heater flows back into the
city main where the pressure is easily dissipated. A “closed” water system prevents the expanding water from
flowing back into the main supply line, and the result of thermal expansion can create a rapid and dangerous
pressure increase in the water heater and system piping. This rapid pressure increase can quickly reach the
safety setting of the relief valve, causing it to operate during each heating cycle.
Thermal expansion, and the resulting rapid and repeated expansion and contraction of components in the
water heater and piping system, can cause premature failure of the relief valve, and possibly the heater itself.
Replacing the relief valve will NOT correct the problem.
The suggested method of controlling thermal expansion is to install an expansion tank in the cold water line
between the water heater and the check valve. The expansion tank is designed with an air cushion built in that
compresses as the system pressure increases, thereby relieving the over-pressure condition and eliminating
the repeated operation of the relief valve. Other methods of controlling thermal expansion are also available.
Contact a qualified service provider for additional information regarding this subject.
(Typical Installations)
Flexible or rigid ¾” drain line and
associated ¾” FNPT fitting
¾” MNPT
Condensate
Drain Port
¾” MNPT
Condensate
Drain Port

14
Water Supply Connections
Note: BEFORE PROCEEDING WITH THE INSTALLATION, CLOSE THE MAIN WATER SUPPLY VALVE.
After shutting the main water supply valve, open a faucet to relieve the water line pressure to prevent any
water from leaking out of pipes while making the water connections to the water heater. After the pressure has
been relieved, close the faucet. Refer to the typical installation illustration below for suggested set-up. The
HOT and COLD water connections are clearly marked and are ¾” NPT on all models. When connecting to the
inlet/outlet ports, the use of ¾” female NPT tapered thread fittings with use of thread sealant is recommended.
The installation of unions is recommended on the hot and cold water connections so that the water heater may
be easily disconnected for servicing if necessary.
Note: Install a shut-off valve in the cold water line near the water heater. This will enable easier service or
maintenance of the unit later.
CAUTION
Do NOT apply heat to the HOT or COLD water connections. If sweat connections are used, sweat
tubing to adapter before fitting the adapter to the cold water connections on heater. Any heat applied
to the hot or cold water connection will permanently damage the internal plastic lining in these ports.
IMPORTANT!
Failure to install and maintain a new, listed 3/4” x 3/4” temperature-pressure relief valve will release the
manufacturer from any claim which might result from excessive temperature and pressures.
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 shall be made to control thermal expansion. Do NOT operate this water
heater in a closed system without provisions for controlling thermal expansion. Your water supplier or local
plumbing inspector should be contacted on how to control this situation.
After installation of 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.
NEVER OPERATE THE WATER HEATER WITHOUT FIRST BEING CERTAIN IT IS FILLED WITH WATER.
CAUTION
For protection against excessive temperatures and pressure, install temperature and pressure protective
equipment required by local codes, but not less than a combination temperature and 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 for Relief Valves and Automatic Gas Shutoff Devices for
Hot Water Supply Systems, ANSI Z21.22. The combination temperature and pressure relief valve shall be
marked with a maximum set pressure, not to exceed the maximum working pressure of the water heater. The
combination temperature and pressure relief valve shall also have an hourly rated temperature steam BTU
discharge capacity not less than the hourly input rating of the water heater.
Install the combination temperature and relief valve into the opening provided and marked for this purpose in the
water heater.
Note: Some models may already be equipped or supplied with a combination temperature and pressure relief
valve. Verify that the combination temperature and pressure relief valve is in compliance with the local codes. If
the combination temperature and pressure relief valve does not comply with local codes, replace it with one that
does. Follow the installation instructions above on this page.
Install a discharge line so that water discharged from the combination temperature and pressure relief valve will
exit within 6 in (15.3 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 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 of 4 in (10.2 cm) be provided on
the side of the water heater for servicing and maintenance of the combination temperature and pressure relief
valve.
Do NOT place a valve between the combination temperature and pressure relief valve and the tank.

15
Water Supply Connections cont.-
Safety Controls
The water heater is equipped with a temperature-limiting control (TCO) that is located above the heating
element in contact with the tank surface. If for any reason the water temperature becomes excessively high,
the temperature-limiting control (TCO) breaks the power circuit to the heating element. Once the control
opens, it must be reset manually. Resetting of the temperature limiting controls should be done by a qualified
service technician.
To reset the temperature-limiting control:
1. Turn OFF the power to the water heater.
2. Remove the jacket access panel(s) and insulation. The thermostat protective cover should NOT be
removed.
3. Press the red RESET button.
4. Replace the insulation and jacket access panel(s) before turning on the power to the water heater.
WARNING
Hydrogen gas can be produced in a hot water system served by this water heater when there has been no
usage for a long period of time (generally two weeks or more). HYDROGEN GAS IS EXTREMELY
FLAMMABLE. To reduce the risk of injury under these conditions, it is recommended that the hot water
faucet be opened for several minutes at the kitchen sink before using any electrical appliance connected to
the hot water system. If hydrogen is present, there will probably be an unusual sound, such as air escaping
through the pipe, as the water begins to flow. There should be NO smoking or open flame near the faucet at
the time it is open.
DANGER
There is a hot water scald potential if the control water temperature is set too high. Households with small
children, disabled, or elderly persons may require a 120°F (49°C) or lower thermostat setting to prevent
contact with “HOT” water.
CAUTION
The cause of the high temperature condition must be investigated by a qualified service technician and
corrective action must be taken before placing the water heater in service again.

16
Water Supply Connections cont.-
Typical Installation
Temperature and Pressure Relief Valve
WARNING
The pressure rating of the relief valve must not exceed 150 PSI (1.03 kPa) or the maximum working
pressure of the water heater as marked on the rating plate.
A new combination temperature and pressure relief valve, complying with the Standard for Relief Valves and
Automatic Gas Shut-off Devices for Hot Water Supply Systems, ANSI Z21.22, is supplied and must remain
installed in the opening provided and marked for this purpose on the water heater. NO valves of any type
should be installed between the relief valve and the tank. Local codes shall govern the installation of relief
valves. The BTUH rating of the relief valve must NOT be less than the input rating of the water heater as
indicated on the rating label located on the front of the water heater (1 watt = 3.412 BTUH).
Connect the outlet of the relief valve to a suitable open drain so that the discharge water cannot contact live
electrical parts or persons and to eliminate potential water damage.
Piping used should be of a type approved for hot water distribution. The discharge line must be no smaller than
the outlet of the valve and must pitch downward from the valve to allow complete drainage (by gravity) of the
relief valve and discharge line. The end of the discharge line should not be threaded or concealed and should
be protected from freezing. No valve of any type, restriction, or reducer coupling should be installed in the
discharge line.
Conduit to electrical
junction box (use only
copper conductors)
Hot water
outlet to
fixtures
Union
(suggested)
Drain valve
Thermal
expansion tank
To cold
water
supply
Shut-off valve
¾” FNPT fitting to
condensate drain
pan
Temperature &
pressure relief valve
Condensate drain line
Relief valve discharge
6” (15.2 cm) minimum
from the floor
To open drain, line
should be at least 3/4” ID and
pitched for proper draining

17
Water Supply Connections cont.-
CAUTION
For protection against excessive temperatures and pressure, install temperature and pressure protective
equipment required by local codes, but not less than a combination temperature and 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 for Relief Valves and Automatic Gas Shutoff
Devices for Hot Water Supply Systems, ANSI Z21.22. The combination temperature and pressure relief
valve shall be marked with a maximum set pressure, not to exceed the maximum working pressure of the
water heater. The combination temperature and pressure relief valve shall also have an hourly rated
temperature steam BTU discharge capacity not less than the hourly input rating of the water heater.
Install the valve into an opening provided and marked for this purpose in the water heater, and orient it or
provide tubing so that any discharge from the valve exits only within 6 in (15.2 cm) above, or at any distance
below the structural floor, and does NOT contact any live electrical part. The discharge opening must not be
blocked or reduced in size under any circumstances.
To Fill the Water Heater:
1. Close the water heater drain valve. This
water heater utilizes a ball valve; when
closing the valve, the stem will spin
indefinitely. Confirm it is closed by ensuring
the slot on the stem is perpendicular to the
valve body.
2. Open the cold water supply shut-off valve.
3. Open several hot water faucets to allow air
to escape from the system.
4. When a steady stream of water flows from the faucets, the water heater is
filled. Close the faucets and check for water leaks at the water heater drain
valve, combination temperature pressure relief valve, and the hot and cold
water connections.
“F11” Fault Code During Installation: If the unit is powered on without a full tank, the error code “F11”
will appear. Turn the power OFF, finish filling the tank with water, then turn on the power back ON.
NOTE: The Dry Tank Detection feature on the tank is for the aid of the installer and should NOT be used as
the primary control to prevent operation with an empty or partially filled tank. Power should NEVER be applied
to the water heater until the installer has verified that the tank is filled, and all air has been purged from the
system.
Electrical Notices: Do NOT incorrectly wire electrical connections. 240 VAC or 208 VAC must be applied
across L1 and L2 wires. Failure to do so will void the warranty and can result in 120 VAC applied to water
heater, which may damage the compressor or other electrical components. If the 4-conductor wire is supplied
to the water heater, then cap the neutral, and connect the remaining wires.
NOTE: Regarding Utility Power-Management Devices (sometimes called Peak Load Reduction Switches) –
Some power-management switching devices or even some basic timer switches exist that reduce voltage from
240 VAC to 120 VAC during high-electricity-demand periods. These devices must be removed from the circuit
providing power to the water heater because of the potential water heater damage noted above. Switching
devices which cut power from 240 VAC to 0 VAC on a periodic basis is acceptable.
“bAd line” Fault Code During Installation: If a “bAd line” is shown on the display, the water heater is not
receiving the correct voltage as a result of incorrect wiring. To correct this fault, turn the power OFF to the
water heater, correct the wiring issue, then turn the power back ON.

18
Electrical Connections
A separate branch circuit with copper conductors,
overcurrent protective device, and suitable disconnect must
be provided by a qualified electrician. All wiring must
conform to local codes or latest edition of National Electrical
Code ANSI/NFPA 70.
The water heater is completely wired to the junction box at
the top of the water heater. An opening of 1/2” electrical
fitting is provided for field wiring connections. The voltage
requirements and wattage load from the water heater are
specified on the rating label on the front of the water heater.
The branch circuit wiring should include either:
1. Metallic conduit or metallic sheathed cable approved
for use as a grounding conductor and installed with
fittings approved for the purpose.
2. Nonmetallic sheathed cable, metallic conduit, or metallic sheathed cable not approved for use as a
ground conductor shall include a separate conductor for grounding. It should be attached to the ground
terminals of the water heater and the electrical distribution box.
To connect power to the water heater:
1. Turn the power OFF.
2. Remove the screw(s) holding the junction box top cover.
3. Install L1 to L1, L2 to L2, and ground to the green ground wire connected to the bottom of the junction
box.
Note:Install electric connections according to local codes or latest edition of National Electrical Code
ANSI/NFPA 70.
WARNING
Proper ground connection is essential. The presence of water in the piping and water heater does NOT
provide sufficient conduction for a ground. Nonmetallic piping, dielectric unions, flexible connectors,
etc., can cause the water heater to be electrically isolated. Do NOT disconnect factory ground.
The manufacturer’s warranty does NOT cover any damage or defect caused by installation, attachment or use
of any type of energy-saving or other unapproved devices into, onto, or in conjunction with the water heater.
The use of unauthorized energy-saving devices may shorten the life of the water heater and may endanger life
and property. The manufacturer disclaims any responsibility for such loss or injury resulting from the use of
such unauthorized devices.
If local codes require external application of insulation blanket kits, the manufacturer’s instructions included
with the kit must be carefully followed.
Application of any external insulation, blankets or water pipe insulation to this water heater will require
careful attention to the following:
•Do NOT cover the temperature and pressure-relief valve.
•Do NOT cover access panels to the heating elements.
•Do NOT cover the electrical junction box of the water heater.
•Do NOT cover the operating or warning labels attached to the water heater or attempt to relocate them
on the exterior of the insulation blanket.
•Do NOT block the air inlet/outlets in the top covers or rear of the unit.
Note: This guide recommends minimum branch circuit sizing based on the National Electric Code. Refer to
wiring diagrams in this manual for field wiring connections.

19
Electrical Connections cont.-
Branch Circuit Sizing Guide
Installation Checklist
Total Water
Heater Wattage
Recommended Over-Current
Protection (fuse or circuit breaker
amperage rating)
208V
240V
277V
480V
3,000
20
20
15
15
4,000
25
25
20
15
4,500
30
25
25
15
5,000
30
30
25
15
5,500
35
30
25
15
6,000
40
35
30
20
8,000
50
45
40
25
9,000
-
50
45
25
10,000
-
-
50
30
11,000
-
-
50
30
12,000
-
-
-
35
Total Water
Heater Wattage
Copper Wire Size AWG Based on
N.E.C. Table 310-16 (167ºF/75ºC.)
208V
240V
277V
480V
3,000
12
12
14
14
4,000
10
10
12
14
4,500
10
10
10
14
5,000
10
10
10
14
5,500
8
10
10
14
6,000
8
8
10
12
8,000
8
8
8
10
9,000
-
8
8
10
10,000
-
-
8
10
11,000
-
-
8
10
12,000
-
-
-
8
1. Tank location:
– Does room size require a louvered door, ducting kit, or similar ventilation? 10 ft x 10 ft x 7 ft or
700 ft3(19.8 m3), or 240 in2(0.15 m²) open air-flow area needed.
– 7 in (17.5 cm) clearance at the rear of the unit and at least 7 in (17.5 cm) clearance around the
sides of the unit. 6 in (15.2 cm) clearance for earthquake strap installations, with additional
clearance on the opposite side of the unit).
– Front of unit is free and clear.
– Is the water heater level? If no, add shims under the base of the unit to ensure proper function of
sensors.
2. Verify Air Filter is installed (located in packaging).
3. Plumbing connections:
– Ensure that air filter removal is not prevented.
– Check for leaks after filling the tank with water, when water is or isn’t flowing.
4. Condensate lines are in place:
– Main flexible or rigid drain line must be installed and directed to a drain or condensate pump.
Reducer fittings are not recommended.
5. Temperature and pressure-relief valve is working and drain line completed per local code.
6. Electrical:
– Verify 208/240 VAC to L1 and L2 at tank.
– Ensure that the electrical connection does not prevent air filter removal.
7. Verify that the control panel displays 120ºF (49ºC) in Hybrid Mode. Assist user in how to adjust
temperature and modes (see “Water Temperature Adjustment” section).

20
Electrical Connections cont.-
What to Expect for “Normal Startup” in Hybrid Mode
After the unit has been installed, with all electrical and water connections secure and checked, then the unit
should be filled with water (vent tank by opening a hot water faucet somewhere in home to allow tank to fully fill
with water). Once the tank is full and power is energized, you may experience the following:
Note: The heat pump operating range is 35ºF to 120ºF (2ºC to 49ºC). If the ambient temperature is outside of
this range, the heat pump will turn off and the electric elements will be used until the ambient temperature
returns to within the operating range. During commissioning, a self-test countdown number will be displayed
indicating the time remaining before the unit begins normal operation.
General Operation
When the switch is closed, the operation of this electric water heater is automatic. The thermostats are preset to
the “HOT” setting to provide a water temperature of approximately 120ºF (49ºC) to reduce the risk of scald injury.
CAUTION
Scalding may occur within 5 seconds at a temperature setting of 140ºF (60ºC).
Care must be taken whenever using hot water to avoid scalding injury. Certain appliances require high
temperature hot water (such as dishwashers and automatic clothes washers).
To Fill the Water Heater:
1. Close the water heater drain valve. This water heater utilizes a ball valve; when closing the valve, the
stem will spin indefinitely. Confirm it is closed by ensuring the slot on the stem is perpendicular to the
valve body.
2. Open the cold water supply shut-off valve.
3. Open several hot water faucets to allow air to escape from the system.
4. When a steady stream of water flows from the faucets, the water heater is filled. Close the faucets and
check for water leaks at the water heater drain valve, combination temperature pressure relief valve,
and the hot and cold water connections.
To Drain the Water Heater:
Should it become necessary to completely drain the water heater, make sure you follow the steps below.
1. Turn OFF the power to the unit. The electric heating elements will become damaged if operated without
water.
2. Attach a hose to the drain valve located at the bottom of the unit and direct the hose to a drain.
3. Turn OFF the cold water supply.
4. Admit air to the tank by opening a hot water faucet or lifting the handle on the relief valve.
5. Open the drain valve with a flat screwdriver.
Elapsed Time Water Heater Actions Comments
0 to 2 minutes
Unit will go through self-check and
display countdown. Fan will turn on
after 1 minute
.
This 2-minute off-time prevents compressor damage. A
clicking noise may be heard during startup.
2 to 22 minutes
Compressor turns on. Fan continues to
run.
This 20-minute period is used to ensure the tank is full of
water (dry-fire prevention algorithm).
22 minutes and
beyond
Compressor turns off (fan will run for
20 minutes after any compressor
operation). Normal heating operation
resumes.
The water heater is operating in Hybrid mode. Quickly
provides initial amount of hot water with heating elements,
then switches to efficient heat pump for majority of heating.
Before closing the switch to allow electric current to flow to the water heater, make certain that the water heater is full
of water and that the cold water inlet valve is open. Complete failure of the heating element(s) will result if they are
not totally immersed in water at all times. Failure of the element(s) due to dry-firing is NOT covered by warranty.