Heatworks MODEL 3 Installation and operating instructions

MODEL 3TANKLESS ELECTRIC WATER HEATER
User Manual & Installation Guide

TABLE OF CONTENTS
INTRODUCTION pg 4
About your MODEL 3 Water Heater pg 4
Registering your unit pg 4
Downloading the Heatworks app and connecting your unit to Wi-Fi pg 4
TECHNICAL DATA pg 8
TROUBLESHOOTING pg 8
INSTALLATION GUIDE pg 9
Important safety information pg 9
Intended use pg 10
What’s included in the box pg 10
MODEL 3 diagram pg 11
Precautions for selecting a location and installation pg 12
Mounting the unit pg 13
Connecting the water supply pg 14
Electrical information pg 15
Electrical installation pg 17
Completing the installation pg 18
WARRANTY AND LEGAL pg 21
Registering your unit pg 21
Manufacturing limited warranty pg 21
Return policy pg 23
Privacy policy pg 24
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INTRODUCTION
Thank you for purchasing the MODEL 3, the world’s most advanced tankless electric water
heater.
ABOUT YOUR MODEL 3 WATER HEATER
The MODEL 3 Water Heater is an internet-connected tankless electric water heater which
provides instant, endless hot water for a house, apartment, points-of-use or in certain
commercial applications. Unlike a conventional storage type water heater, the MODEL 3
does not store a large volume of hot water. Instead, water is heated instantaneously as
it ows through the unit using Ohmic Array Technology. This patented process replaces
metal heating elements found in other water heaters with a precisely engineered array
of graphite electrodes and a digital control system to provide unlimited hot water on
demand.
REGISTERING YOUR UNIT
You must register this product on our website within 90 days of purchase in order to
activate the 6-year full unit exchange warranty or be eligible for the extended warranty.
If you do not activate your warranty within 90 days, your MODEL 3 Water Heater will be
covered from the date it was manufactured. Go to our website at www.myheatworks.com/
pages/registration to complete the registration process.
If you have any questions regarding the warranty or have trouble registering your unit,
please call our customer support team at 888-506-2821.
DOWNLOADING THE HEATWORKS APP AND CONNECTING YOUR
UNIT TO WI-FI
Though not required, we highly recommend that you download the Heatworks app and
connect the MODEL 3 to your Wi-Fi network at the time of installation or as soon as
wireless internet is available.
By connecting your unit to your Wi-Fi network, you can take advantage of additional
features such as being able to remotely control temperature settings as well as timer and
scheduling functions of your unit; enable important over-the-air rmware updates to your
unit; advanced reporting features like energy usage per day and per month, calculating
the price per gallon of hot water, and identifying the amount of total dissolved solids; and
communication between your unit and other bluetooth devices, such as leak and vibration
sensors. If you cannot connect to Wi-Fi at this time, skip this section for now and move on
to “SETTING AND ADJUSTINGTHE SETPOINTTEMPERATURE” on page 20.
1To connect your MODEL 3 unit to your Wi-Fi network, you must rst download the
Heatworks mobile application from either the iPhone App Store or the Google Play
Store.

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2Once the Heatworks app is installed on your smart device, you will need to set up an
account.
3Check your email for a message from [email protected]h.The subject will be “Your
Heatworks verication code”. If it isn’t in your inbox, please check your junk mailbox.
This email will provide your special code that you will need to enter into the Heatworks
app to verify your account.
To set up your account, please provide your rst and
last name, your email address and a password that
is at least 8 characters.You must also review and
agree to Heatworks’Terms of Service and Privacy
Statement.
Please note that you will be asked to verify your
email account by entering a special code that will be
sent immediately to the email address you provide.
Make sure you have access to your email account or
you will not be able to proceed to the next step.
Click the “Create Account” button.
4Go back into the Heatworks app and enter the special code you received via email. You
will then see this screen:
Congratulations!You have successfully created your
Heatworks account and can now use the app.
Click the “Continue” button and log back into your
account by providing your email address and
password.

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4Once you are logged into your veried account, you will then need to connect to your
MODEL 3 unit.
To do this, make sure you are standing no more
than 10 feet away from the installed MODEL 3 unit
to which you are pairing and that the unit is on.You
will know the unit is on when you see an illuminated
green button located on the front home button of the
unit. If it isn’t on, simply press the button once and it
will turn on.
Once the unit is on, hold down the home button on
the front of the unit to illuminate the menu. Navigate
to the menu where “Onbd” is displayed on the
screen; the home button will also turn blue.
5You should see this screen. If you don’t, please make sure that power to the MODEL
3 is on, your unit is displaying “Onbd” and the home button is illuminated, your Wi-Fi
network is available, and that you are standing within 10 feet of the unit.
Follow the on-screen steps to pair your MODEL 3 unit
to your device.
Step 1: Choose the MODEL 3 unit you are syncing.

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7Step 3:The MODEL 3 will now pair with your Wi-Fi network. Once successfully
completed, the app will return to your dashboard, where you can control and monitor
your hot water system.
6Step 2: Connect to the wireless network by choosing or entering your network name
and network password.

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TROUBLESHOOTING
If your MODEL 3 Water Heater displays an error code, please call 888-506-2821 or visit
our support page at www.myheatworks.com to learn more. Additionally, if you detect
abnormal operation, turn the circuit breaker associated with your unit off and call
888-506-2821.
CAUTION: Warranty will be void if anyone, including but not limited to the installer or
customer, decides to open the metal casework of the unit to service the product (electrical
access panel cited on page 17, step 2, is excluded from this statement). Attempts to
service the MODEL 3, including but not limited to, opening the casework of the unit or the
pressure vessel will result in a voided warranty and deems the unit non-refundable.
TECHNICAL DATA
Size
Weight
Connections
Digital Controls
Voltage
Frequency
Power
Working Pressure
Conductivity
Current
11” x 13.2” x 10”
35 lbs
3/4” NPT male connections
LED panel, Full Wi-Fi connectivity,
Mobile app
41° F rise at 4 GPM,
82° F rise at 2 GPM
6-year full unit exchange, 4-year
extended warranty available
208-240 V
50/60 Hz
6.2-24 kW
30-80 psi, 2.06-5.52 bar, 206-552 kPa
80-2000 μS
30-100 A
OPERATING RANGES
PRODUCT INFORMATION
Max Temp Rise
Warranty

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INSTALLATION GUIDE
IMPORTANT SAFETY INFORMATION
This manual must be read carefully and before attempting to install the MODEL 3. If you
do not follow the safety rules or the instructions outlined in the manual, the unit may
not operate properly and it could cause property damage, serious bodily injury and/or
death. Heatworks will not be liable for any damages because of failure to comply with the
installation and operating instructions outlined in this manual.
This unit must be installed by a licensed electrician and plumber.The installation must
comply with all national, state and local plumbing and electric codes. Proper installation
is the responsibility of the installer. Failure to comply with the installation and operating
instructions or improper use voids the warranty.
This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to part 15 of the FCC Rules.These limits are designed to provide
reasonable protection against harmful interference in a residential installation.This
equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of the following
measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Save these instructions for future reference. Installer should leave these instructions
with the consumer. If you have any questions regarding the installation, use or operation
of this water heater, or if you need any additional installation manuals, please call our
customer support team at 888-506-2821 or visit the support page on our website.
Throughout this manual, we have highlighted certain points that require special attention.
These points are indicated by the three BOLDED categories below:
• “IMPORTANT” Commonly missed step in installation.
• “CAUTION” Negligence of this step could result in damage to your unit or personal
injury.
• “HEATWORKS RECOMMENDS” The user or installer should be aware of these
additional notes and benets.

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INTENDED USE
INDOOR USE ONLY
THE MODEL 3 SHOULD NEVER BE EXPOSEDTO FREEZING CONDITIONS.
The appliance is intended for heating residential hot water and supplying one or more
draw-off points. If you are unsure about your intended application or installation, please
call 888-506-2821 or visit our support page at www.myheatworks.com.
Any other use beyond that described shall be deemed inappropriate. Failure to comply
with the installation and operating instructions or improper use voids the warranty.
Observation of these instructions is also part of the correct use of this appliance.
WHAT’S INCLUDED IN THE BOX
IMPORTANT: Before removing the old tank water heater and beginning installation of the
new unit, unbox the MODEL 3. Remove all parts from the box and ensure all parts are
included.
CAUTION: It is required that a licensed plumber and electrician install the unit and that
the installation must comply with all national, state and local plumbing and electric codes.
Proper installation is the responsibility of the installer.
• One (1) MODEL 3 Water Heater
• One (1) MODEL 3 mounting bracket with two (2) pre-installed MODEL 3 mounting
bracket screws
• One (1) MODEL 3 Water Heater Quick Start Guide

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11.0”
13.2”
2.2”
12” MIN
CLEARANCE
HOT
3/4” NPT
10.0”
L2
L1
COLD
3/4” NPT
GROUND
FRONT VIEW
SIDE VIEW

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Ensure domestic water supply is turned off.
The MODEL 3 unit must be installed where minimum clearances can be met and
indoors where it is protected from the elements and extreme weather.
The unit MUST be installed in an upright orientation with the water ttings
positioned below and pointing downward.
When connecting to PEX or HighTemperature CPVC pipe, we strongly recommend
that aT&P valve be used for added safety. For example, installations in the
Commonwealth of Massachusetts and State of Kentucky require a pressure relief
valve. Please check your local installation codes for any special requirements.
The unit must be mounted to wall studs or structural member capable of
supporting 40 pounds. If there is no wall stud or convenient structural member
available, ensure that appropriate wall anchors for the type of wall surface are
used and sufcient to securely hold 40 pounds.
1
3
2
4
5
PRECAUTIONS FOR SELECTING A LOCATION AND INSTALLATION
In general, the MODEL 3 can be installed in the same location where the old tank water heater was
located or depending local codes, in a more centralized location in your home. However, to ensure
safe performance and keep the warranty in effect, the following precautions must be observed:
CAUTION: Failure to comply with these requirements may result in the unit falling from
the wall, creating the possibility of personal injury or death.
MOUNTING THE UNIT
HEATWORKS RECOMMENDS: Wall studs should be utilized when mounting the water
heater to the wall. Alternately, a suitable piece of wood may be placed inside or outside
of the wall to span the distance between the wall studs. Fasten the water heater mounting
bracket to the wood.
CORRECT INCORRECT INCORRECT

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Using a bubble level, afx the
mounting bracket to the wall, using
the dimensions in the MODEL 3
Diagram found on page 11 to help
position the unit. Make sure to
pick a location that will be easy to
access the service access panel on
the right side of the unit, as well as
the tting connections located on
the bottom of the unit.The bracket
must be mounted to wall studs,
a structural member, or with wall
anchors able to support 40 pounds
and appropriate for the type of wall
surface if there are no wood studs
behind the surface.
The MODEL 3 unit has one (1) large
slot on its back panel that will t
on the two (2) tabs located towards
the top of the mounting bracket.
Lift the MODEL 3 unit and place
it ush on the wall with its back
against the mounting bracket,
slightly above where the tabs are
situated. Slowly lower the unit
down until it is fully resting on the
two tabs of the mounting bracket.
Ensure that both slots are in place.
Line up the screw holes located
on the bottom of the unit with the
corresponding holes on the lower
lip of the mounting bracket by
sliding the unit left or right on the
tabs if necessary to center, and then use the two (2) screws supplied to secure the
MODEL 3 unit to the mounting bracket lip.
CAUTION: Failure to comply with this requirement may result in the unit falling from the
wall, creating the possibility of personal injury or death, or damage to the unit.
The MODEL 3 Water Heater is now securely attached to the wall.
1
2
3
Mounting bracketMODEL 3 rear view
CONNECTING THE WATER SUPPLY
When using a water well supply or a water supply where sediment is commonly found in
the water, Heatworks recommends installing a sand lter on the water supply line before
the cold water inlet of the MODEL 3.

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The MODEL 3 must be properly and securely connected to the water supply.
The unit has two plumbing connections:
• 3/4” NPT male cold water supply inlet (leftmost when facing the unit)
• 3/4” NPT male hot water outlet
1
2
3
4
Correct mating ttings or adapters will need to be used to properly plumb the MODEL 3 unit. We
strongly recommend installing at least 18” of copper piping or 18”of 3/4” exible water heater
connection hoses directly to the unit. When installing PEX piping, please reference material
manufacturer’s recommendations/requirements and ensure it is compliant with your local
plumbing codes.
CAUTION: When applying plumber’s tape to the inlet and outlet of the MODEL 3, Heatworks
requires installer to avoid allowing plumber’s tape to obstruct the inlet or outlet. Applying the
plumber’s tape past the rst thread should ensure that no tape ows into the water stream after
proper plumbing connections are attached.
CAUTION: Serious damage to your MODEL 3 can occur if all water lines in the plumbing system
are not ushed of debris entirely before installing the MODEL 3 for both retro-t and new
construction projects.This is required to keep all foreign matter from entering the MODEL 3.
Failure to do so prior to installing the MODEL 3 will void the warranty.
HOT
3/4” NPT
COLD
3/4” NPT
Ensure domestic water supply is turned off.
Connect the inowing cold water supply to the inlet connection on the unit.
Next, connect the outowing hot water supply main to the outlet connection on the
unit.
Check to ensure all ttings and connections are tightened appropriately, but not over
tightened as this may damage the unit.

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6
7
Turn on the water supply to the system. Open a hot water tap in the house and
allow water to ow for at least three (3) minutes, until there is a steady stream of
water owing out of the tap with no air “spitting” in the stream.
IMPORTANT: Outowing water will be cold at this point of installation. Water will not ow
hot until an electrical supply is connected. Verify that the inlet and outlet connections are
leak-free, both with water owing and with the water ow stopped.
Heatworks strongly recommends installing aT&P relief valve; in addition, aT&P
valve may be required to meet installation codes in your area. If one is required,
install the pressure relief valve in accordance with local codes and ensure that it
operates correctly and that air is purged from the valve prior to installing the water
heater. If one is used, install the valve branched off of the hot outlet side. Check to
ensure the T&P valve and ttings associated with the valve are not leaking.
The MODEL 3 Water Heater plumbing connections are now completed.
ELECTRICAL INFORMATION
CAUTION: If you ever detect abnormal operation, turn the circuit breaker associated with
your unit off and call 888-506-2821.
CAUTION: This water heater is an electrically powered high voltage and high current
device. It must be installed by a licensed electrician and licensed plumber in accordance
with all national, state, provincial and local electrical and plumbing codes. Failure to
install this unit in accordance with all applicable codes and requirements may result in
personal injury or death.
CAUTION: Always turn off the power circuit breakers at BOTH the main electrical panel
or subpanel. High voltage is present in the system. Personal injury or death can result if
caution is not taken.
CAUTION: Serious damage to your MODEL 3 can occur if all air is not purged from the
water lines initially, or at any time after installation where air might have been introduced
into your home water system.
CAUTION: NEVER turn power on if there is a possibility the water in the heater is frozen.
CAUTION: Supply this appliance only from a grounded system. A green terminal (or a
wire connector marked “G”, “GR”, “GROUND”, or “GROUNDING”) is provided for wiring
the appliance.To reduce the risk of electric shock, connect this terminal or connector to
the grounding terminal of the electric service or supply panel with a continuous copper
wire in accordance with the electrical installation code.
RECOMMENDS: Heatworks recommends using crimps on electrical leads for ease of use
during this step in installation.
5
GROUND WIRE IS REPRESENTED ON PRODUCT
LABELING ASTHIS UNIVERSAL SYMBOL.

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ELECTRICAL SERVICE
According to the denition in the National Electric Code (also known as NFPA 70),
an appliance load that is not continuous for three hours or more is considered non-
continuous.Therefore, the MODEL 3 Water Heater, when used for standard domestic
hot water applications, is considered a non-continuous heating appliance. Due to the
diversity of water heating in a home, the load (amps) contribution of the MODEL 3 to the
overall service load of the home or building can be calculated using the optional methods
of NEC, sections NEC 220-82 or 220-83. For new dwellings, the service load should be
calculated using NEC 220-82. For existing dwellings, the service load should be calculated
using NEC 220-83. By both calculation methods, the MODEL 3 load is generally added to
the service load at 40% of its maximum nameplate rating.
For instance, the full load current rating of the MODEL 3 Water Heater is 100 A and 40%
of this rating is 40 A.The 40 A is typically the load added to the overall service load of
the dwelling when using the optional calculation methods as described in NEC 220-82
and 220-83, not the full load current rating of 100 A. (Note that a conventional electric
water heater rated for use on a 30 A circuit will draw 4.5 kW or 18.75 A.) Using the same
calculation method, 40% of the nameplate rating for a conventional 4.5 kW electric tank
water heater is 7.5 A. So, one MODEL 3 will add 32.5 A (40 A minus 7.5 A) additional amps
to the service load since 7.5 A were already available for the existing tank.
POWER/VOLTAGE MODULATION
During operation, the MODEL 3 Water Heater is designed to use only the power necessary
to heat the water for various combinations of temperature rise and ow rate.
DISCONNECTS AND SUBPANELS
Electrical disconnect devices do not contain circuit breakers and are not required by
the NEC for residential appliances such as the MODEL 3 or any appliance rated less
than 300 volts. However, disconnects may be required by the NEC for motor loads and
for appliances with multiple circuits in commercial applications. Electrical subpanels
or parallel panels, containing circuit breakers, may be used with appliances such as
the MODEL 3 in residential and commercial applications. In new, and in some existing
residential construction, there are generally enough breaker spaces in the main electrical
panel to accommodate the circuit breaker associated with the MODEL 3. An electrician’s
load analysis is recommended if there is doubt about available breaker spaces. However,
in some existing homes, the main electrical panel may be nearly full of circuit breakers
serving existing loads. In these cases, one or more subpanels, each with a single large
breaker rated for the entire load of the water heater, can be installed off the main panel.
The boxes for a 100 A subpanel can be purchased for about $50 each, and the breaker for
about $40. Smaller boxes and breakers are slightly less expensive.
BRANCH CIRCUITS AND BREAKERS
As a non-continuous heating appliance, the branch circuit wires and breakers must be
sized to at least 100% of the maximum ampere rating of the appliance.This is particularly
important to avoid over heating of the wires at the connections to the breakers.
Overheating at the breaker connections may cause nuisance or premature breaker trips.
It is recommended that the copper wire for the branch circuits and subfeeds be rated for
at least 75° C. If you useTHHN, which is rated for 90° C, the wire gauge is smaller than
standard 75° C wire, and the nylon covering makes it much easier to pull.

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4
L1 L2G
FPO
L1 L2G
The MODEL 3 requires two power conductors and one grounding conductor.
The power conductors should be Line 1 and Line 2 for a typical 208, 220, or 240
VAC single phase installation.The grounding conductor should be connected to
Earth Ground. Feed wire through the bottom of the unit and connect each of the
individual wires as highlighted on the label in the service access area.Tighten
each lug; make sure each connection is very snug.
ELECTRICAL INSTALLATION
Ensure the power circuit breakers at BOTH the main electrical panel or subpanel
are turned off.
Remove the service access panel cover located on the right bottom side of the
unit by removing the two (2) screws and carefully setting aside.
Verify all wiring (wire gauge) and circuit protection (breakers) comply with
national and local electrical codes.
1
2
3
Amperage and Wiring Table
*This table is for copper wire gauges only
30
35
40
45
50
60
70
80
90
100
10
8
8
8
8
6
4
4
3
3
10
8
8
8
8
6
6
4
4
3
Currents (amps) Wire gauge (75° C | 167° F) Wire gauge (90° C | 194° F)

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1
2
6
Tighten the strain relief.
Place the service access panel cover back in on the MODEL 3 unit and fasten it in
using the two (2) screws.
Conrm that the cold water supply main is turned on and that main power is
securely connected to the unit.
Open a hot water tap inside the home and allow it to ow for a minimum of two (2)
minutes to purge air from the water lines.Turn off the tap.
5
L1 L2G
COMPLETING THE INSTALLATION

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3
4
5
6
Switch ON the main power circuit breakers.
Switch ON the MODEL 3 unit circuit breaker.
The unit will power up and a dot will appear on the display, indicating the unit has
power.
The next step in the installation process is to set your amperage by accessing the
amperage menu. To do that, it is rst important to better understand the various
menus that the MODEL 3 displays.
ACCESSING MODEL 3 MENUS
There are two different types of menus in the MODEL 3. The rst is the main menu,
which shows the user the current setpoint temperature (green dot), output water
temperature reading (red dot), actual current draw reading in amps (purple dot),
actual water ow reading in GPM (blue dot), and any error codes detected by the
unit (green dot).This menu can be accessed by simply tapping the home button
once to cycle through each option.To exit this menu and return to the power on
screen, simply cycle through each option until the menu screen is off and a single
green dot is displayed in the home button.
The second type is the settings menu.To access this, initiate a long press (press
home button for approximately two (2) seconds) from any menu screen. If you are
executing a long press from “power on”, the screen will pass through the output
temperature menu showing “120F” on the display before ultimately reaching the
“C” and “F” menu. Release the long press when you see “C” and “F” on the menu
screen with a home button ashing white. This is the rst menu in settings. The
settings menu contains options for celsius and fahrenheit, the amperage menu,
and the onboarding screen.The amperage, celsius and fahrenheit menus will time
out in 30 seconds and return to the “power on” screen if no settings have been
changed.
See both the main and settings menu owchart on the next page as a reference
guide.

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MAIN MENU SETTINGS MENU
Output
Water
Temperature
Reading
Adjust
Setpoint
Temperature
Tap
Set
Maximum
Current
(amps)
Select
Degrees
°C or °F
Onboard
to
WiFi
Hold
Hold
Hold
Hold
Hold
Actual
Current Draw
Reading
(amps)
Actual
Water Flow
Reading
(GPM)
Error
(if exists)
Hold
Hold
Hold
Tap
Power On
Tap
Tap
Tap
Tap
Tap
Tap
Main and Settings Menu Flowchart