STIEBEL ELTRON TEMPRA 12 TREND Instruction Manual

OPERATION AND INSTALLATION
OPERACIÓN E INSTALACIÓN
UTILISATION ET INSTALLATION
TANKLESS ELECTRIC WATER HEATERS|CALENTADORES DE AGUA SIN TANQUE|CHAUFFE-EAU
INSTANTANÉS ÉLECTRIQUES
Conforms to ANSI/UL Std. 499
Certified to CAN/CSA Std. C22.2 No.88
Conforme a ANSI/UL Std. 499
Certificación con CAN/CSA Std. C22.2 No.88
Conforme à la norme ANSI/UL Std. 499
Certifié à la norme CAN/CSA Std. C22.2 No.88
Tested and certified by WQA to NSF/ANSI372
for lead free compliance.
Probado y certificado por WQA NSF/ANSI 372 para
el cumplimiento de las regulaciones sin plomo.
Testé et certifié par WQA à la NSF/ANSI 372 pour une
utilisation sans plomb.
» TEMPRA® 12 TREND
» TEMPRA® 15 TREND
» TEMPRA® 20 TREND
» TEMPRA® 24 TREND
» TEMPRA® 29 TREND
» TEMPRA® 36 TREND
» TEMPRA® 12 PLUS
» TEMPRA® 15 PLUS
» TEMPRA® 20 PLUS
» TEMPRA® 24 PLUS
» TEMPRA® 29 PLUS
» TEMPRA® 36 PLUS

2|TEMPRA TREND & TEMPRA PLUS WWW.STIEBEL-ELTRON-USA.COM
CONTENTS | OPERATION
OPERATION
1. General Information
Read this entire manual. Failure to follow all the guides, instruc-
tions and rules could cause personal injury or property damage.
Improper installation, adjustment, alteration, service and use of
this unit can result in serious injury.
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 responsi-
bility of the installer. Failure to comply with the installation and
operating instructions or improper use voids the warranty.
Save these instructions for future reference. The installer should
leave these instructions with the consumer.
If you have any questions regarding the installation, use or opera-
tion of this water heater, or if you need any additional installation
manuals, please call our technical service line at 800-582-8423
(USA and Canada only). If you are calling from outside the USA or
Canada, please call USA 413-247-3380 and we will refer you to a
qualified Stiebel Eltron service representative in your area.
!This is the safety alert symbol. It is used to alert you to
potential personal injury hazard. Obey all safety mes-
sages that follow this symbol to avoid possible injury
or death.
2. Safety
Observe the following safety information and regulations.
Operate the appliance only when fully installed and with all safety
equipment fitted.
2.1 Intended use
The appliance is intended for heating domestic hot water and can
supply several draw-off points.
Any other use beyond that described shall be deemed inappro-
priate, and may void the manufacturers warranty.
Observation of these instructions is also part of the correct use
of this appliance.
OPERATION
1. General Information _________________________________________2
2. Safety__________________________________________________________2
2.1 Intended use______________________________________________________ 2
2.2 Safety Precautions_______________________________________________ 3
2.3 Test symbols ______________________________________________________ 3
2.4 Licences / certificates ___________________________________________ 3
3. Register your product _______________________________________3
4. General ________________________________________________________3
4.1 General appearance_____________________________________________ 4
5. Using the display_____________________________________________5
5.1 User input _________________________________________________________ 5
5.2 Tempra Trend display___________________________________________ 5
5.3 Tempra Plus display_____________________________________________ 6
INSTALLATION
6. Installation configuration _________________________________ 10
6.1 Typical residential installation _______________________________ 10
6.2 Typical commercial installation______________________________ 10
7. Mounting the unit __________________________________________ 10
7.1 Mounting dimensions__________________________________________ 10
7.2 Mounting instructions _________________________________________ 10
8. Water connections _________________________________________ 11
9. Electrical connection_______________________________________ 12
9.1 Circuit Layout ____________________________________________________ 12
9.2 Circuit Connection ______________________________________________ 13
9.3 Terminal block___________________________________________________13
10. Commissioning the water heater_________________________ 13
11. Normal maintenance_______________________________________ 13
12. Troubleshooting ____________________________________________ 14
12.1 Tempra Plus error code reporting___________________________ 14
12.2 Resetting the safety thermal cutout ________________________ 14
13. Technical Data ______________________________________________ 15
13.1 Tempra Trend____________________________________________________ 15
13.2 Tempra Plus______________________________________________________ 16
13.3 Temp. increase above ambient water temp. ______________ 17
13.4 Dimensions_______________________________________________________ 18
13.5 Wiring Diagrams________________________________________________ 19
14. Spare parts _________________________________________________ 20
15. Warranty ____________________________________________________ 22

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ENGLISH
OPERATION
REGISTER YOUR PRODUCT
2.2 Safety Precautions
!DANGER: Injury
Please read and follow these instructions. Failure to
follow these instructions could result in serious per-
sonal injury or death.
!DAMAGE TO THE APPLIANCE AND THE ENVIRONMENT:
The appliance must be installed by a licensed electrician
and plumber. The installation must comply with all na-
tional, state and local plumbing and electric codes.
Service of the appliance must be performed by qualified
service technicians.
DANGER: Electrocution
Before proceeding with any installation, adjustment,
alteration, or service of this appliance, all circuit
breakers and disconnect switches servicing the appli-
ance must be turned off. Never remove the appliance‘s
cover unless the electricity servicing the appliance is
turned off. Failure to do so could result in personal
injury or death.
The appliance must be properly grounded. Failure to
electrically ground the product could result in serious
personal injury or death.
DANGER: Burns
Water temperatures over 125°F (52°C) can cause
severe burns instantly or death from scalding. A hot
water scalding potential exists if the thermostat on
the appliance is set too high. Households with small
children, disabled or elderly persons may require that
the thermostat be set at 113°F (45°C) or lower to
prevent possible injury from hot water.
!WARNING: Injury
Where children or persons with limited physical, sen-
sory or mental capabilities are to be allowed to con-
trol this appliance, ensure that this will only happen
under supervision or after appropriate instructions by
a person responsible for their safety. Children should
be supervised to ensure that they never play with the
appliance.
2.3 Test symbols
See the type label on the appliance.
2.4 Licences / certificates
- UL (U.S.A) Std. 499
- CSA (Canada) Std. C22.2 No.88
- NSF/ANSI 372
3. Register your product
You must register this product within 90 days of pur-
chase on our web site in order to activate the standard
warranty. Go to our web site at
www.stiebel-eltron-usa.com and click on register
your product.
Before beginning the registration process, we suggest that
you gather the necessary information which will be as
follows:
Type, Example: Tempra 24 Plus (from the label that is on the
unit)
Number listed after “Nr.”
Place of Purchase
Purchase Date
First & Last Name
Email address
Physical Address
Phone Number
Installation Date
IF YOU HAVE ANY QUESTIONS CONCERNING THE REGISTRA-
TION PROCESS OR WARRANTY, PLEASE CONTACT STIEBEL EL-
TRON USA DIRECTLY AT (800)-582-8423.
4. General
The Tempra Trend and Tempra Plus units are designed to supply
hot water for a house, apartment or certain commercial applica-
tions. Unlike a conventional storage type water heater, the Tempra
tankless water heater does not store hot water. Instead, water is
heated instantaneously as it flows through the unit. The Tempra
offers greater energy efficiency than storage type water heaters
due to the absence of stand-by losses and reduced hot water
pipe runs.
The input of heat into the water is controlled electronically. The
Tempra will deliver any water temperature between 68°F (20°C)
and 140°F (60°C). Set the desired temperature using the knob on
the front cover. The Tempra Trend and Tempra Plus temperature
adjustment knob can be set to: OFF, 68-140°F (20-60°C). The max-
imum temperature is electronically limited to 140°F (60°C).
For reasons of appliance efficiency and durability (scaling), the
optimum temperature setting lies between 86 °F (30 °C) and
120 °F (50 °C).
The Tempra has a built-in display that allows for user customiza-
tion and information feedback.

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4.1 General appearance
4.1.1 Tempra Trend
1
2
3
4
1 Display
2 Tmax button
3 Power status LED
4 Control knob
Tempra Trend display overview
5
6
7
8
9
5 Digit display
6 Power capacity status
7 Tmax indicator
8 Temperature unit indicator
9 Display-lock indicator
4.1.2 Tempra Plus
1
2
3
4
5
6
1 Display
2 Preset 1
3 Power status LED
4 Control knob
5 Menu button
6 Preset 2
Tempra Plus display overview
7
8
9
10
12 13 14
15
16
17
18
19
20
11
7 Primary digit display
8 Power capacity status
9 Display-lock indicator
10 Error code symbol
11 Secondary digit display
12 Tmax indicator
13 Savings statistics indicator
14 x1000 secondary display value
15 Gallons secondary display unit
16 kWh secondary display unit
17 Liters & liters per minute secondary display unit
18 Gallons per minute secondary display unit
19 Temperature unit for secondary display
20 Temperature unit for primary display
OPERATION
GENERAL

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5. Using the display
5.1 User input
The Tempra Trend and Tempra Plus feature an interactive display
that allow for user customization to increase the level of comfort
for the user.
The menu structure is designed in an intuitive, linear way to make
it as navigable as possible.
5.1.1 Tempra Trend user input
User input
Tmax button (pressing or holding this button
performs different functions)
Control knob (turn knob to change settings)
5.1.2 Tempra Plus user input
User input
Information button (pressing or holding this
button performs different functions)
Preset 1 button (pressing or holding this but-
ton performs different functions)
Preset 2 button (pressing or holding this but-
ton performs different functions)
Control knob (turn knob to change settings)
5.2 Tempra Trend display
The Tempra Trend display features a temperature and power capa-
city display. The display is backlit and will illuminate whenever
user input is detected. The backlight will time out and deactivate
if no user input has been detected for 15 seconds.
For the name of each display element on the Tempra Trend, consult
section 4.1.1, “Tempra Trend”, pg. 4.
5.2.1 Base display
The base display shows the current temperature setpoint in your
preferred temperature unit. The bar below the temperature shows
the current operating capacity. As the hot water demand fluc-
tuates, the power capacity status will change to show between 0
and 10 segments. The display below shows that the water heater
is operating at 40% of capacity.
All other menu displays will revert back to the base display either
after a 15 second period of time without user input, or after a 5
second hold of the Tmax button.
Changing the setpoint temperature
The setpoint temperature can be set between 68°F (20°C) and
140°F (60°C).
The setpoint can be increased by turning the control knob
clockwise, and decreased by turning it counter-clockwise. The
water heater can be deactived while still powered by turning the
control knob counter-clockwise, past the 68°F (20°C) setting.
5.2.2 Parameters menu
While at the base display, holding the Tmax button for 5 seconds
will advance the display to the first parameter menu.
Tmax parameter setting
The first parameter menu sets the value for Tmax. The value of
Tmax acts as a high temperature limiter. If the Tmax value is set, the
setpoint of the water heater cannot be set above the Tmax value.
This feature is useful in scenarios where scalding from hot water
is a real possibility.
At the Tmax setting menu, the display will flash, indicating that
the value can be changed by rotating the control knob. The Tmax
value can be increased by turning the control knob clockwise, and
decreased by turning it counter-clockwise. The Tmax value can be
deactived by turning the control knob counter-clockwise, past the
68°F (20°C) setting. The display will read "Off" if Tmax is inactive.
If the Tmax symbol is visible at the base display, then the Tmax func-
tion is active and is limiting the maximum allowable temperature
to the preset level.
ENGLISH
INSTALLATION
USING THE DISPLAY

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INSTALLATION
USING THE DISPLAY
Pressing the Tmax button once while at this display will move the
display onto the temperature units parameter setting.
Temperature units parameter setting
The Tempra Trend is capable of displaying temperature in either
Fahrenheit or Celsius.
The current unit will be shown and the display will be flashing to
indicate that the value can be changed. Rotate the control knob to
change the value between Fahrenheit and Celsius.
Pressing the Tmax button once while at this display will move the
display onto the display-lock parameter setting.
Display-lock parameter setting
The display can be locked to prevent changes to the temperature
setpoint. This menu will flash, indicating that the value can be
changed by rotating the control knob. While the display shows
"Off", the lock is not active. The lock is active when it reads "On".
If the display-lock parameter is set to "On" and the user either
holds the Tmax button for 5 seconds or lets the display time out for
15 seconds, the display-lock will become active.
With the display-lock active, a lock will appear on the base display,
and no parameters can be changed. In order to disable the lock,
hold the Tmax button for 12 seconds. The lock will then disappear
from the display and all parameters can be changed again.
Pressing the Tmax button once while at the display-lock parame-
ter setting menu will move the display back onto Tmax parameter
setting menu.
5.2.3 Returning to the base display
While navigating the display and on any menu other than the
base display, holding the Tmax button for 5 seconds will return the
display to the base display. Additionally, the display will revert
to the base display after a 15 second period with no user input.
5.3 Tempra Plus display
The Tempra Plus features a primary and secondary display area
allowing for multiple parameters or information to be displayed.
The Tempra Plus is capable of displaying the current flow rate of
the water passing through the water heater, as well as calculating
the accumulated cost savings of having a tankless water heater
compared to a tank-type water heater.
For the name of each display element on the Tempra Plus, consult
section 4.1.2, “Tempra Plus”, pg. 4.
5.3.1 Base display
The Tempra Plus base display displays the current setpoint tem-
perature in your preferred temperature unit in the top half of the
display.
The bar below the temperature shows the current fraction of total
capacity that the water heater is running at. As the hot water
demand fluctuates, the power capacity status will change to show
between 0 and 10 segments. The display below shows that the
water heater is operating at 30% of capacity.
The bottom half of the display shows the current flow rate through
the unit in either gallons per minute (gpm) or liters per minute
(l/min).
All other menus will revert back to the base display either after a
15 second period of time without user input, or after a 5 second
hold of the Information button.
5.3.2 Information menu
The information menu structure displays additional information
for the user. The information menu is accessed by pressing the
Information button while at the base display.
Accumulated cost savings display
If the Information button is pressed while the display is showing
the base display, the display will advance to the accumulated cost
savings display.
The accumulated cost savings display will display "I1" in the top
half of the display, and the bottom half of the display will alternate
between "Cur" and the accumulated savings of the water heater.

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ENGLISH
INSTALLATION
USING THE DISPLAY
The accumulated cost savings updates daily, and shows the esti-
mated savings for the user compared to an install where they
would have had a tank-type water heater installed.
This savings estimate is based on the users electricity cost. For
the most accurate estimate, the electricity cost per kWh should
be set in the electricity cost parameter setting menu. For infor-
mation on how to do this, see section “Electricity cost parameter
setting”, pg. 8.
Pressing the Information button will advance back to the base
display. The display will also revert back to the base display if no
user input is detected for 15 seconds.
5.3.3 Parameters menu
The parameters menu allows multiple settings on the Tempra Plus
to be altered. The parameters menu can be accessed by holding
the Information button for 5 seconds.
Tmax parameter setting
The first parameter menu sets the value for Tmax. The value of
Tmax acts as a high temperature limiter. If the Tmax value is set, the
setpoint of the water heater cannot be set above the Tmax value.
This feature is useful in scenarios where scalding from hot water
is a real possibility.
At the Tmax setting menu, the temperature value will flash, in-
dicating that the value can be changed by rotating the control
knob. The Tmax value can be increased by turning the control knob
clockwise, and decreased by turning it counter-clockwise. The
Tmax value can be deactived by turning the control knob counter-
clockwise, past the 68°F (20°C) setting. The display will read "Off"
if Tmax is inactive.
If the Tmax symbol is visible at the base display, then the Tmax func-
tion is active and limiting the maximum allowable temperature.
Pressing the Information button once while at this menu will move
the display onto the temperature units parameter setting.
Temperature units parameter setting
The Tempra Plus is capable of displaying temperature in either
Fahrenheit or Celsius.
The current unit will be shown and the secondary display value
will be flashing to indicate that the value can be changed. Rotate
the control knob to change the value between Fahrenheit and
Celsius.
Pressing the Information button once while at this menu will move
the display onto the volume units parameter setting.
Volume units parameter setting
The Tempra Plus is capable of displaying volume or volume flow
in either gallons per minute (gpm) or liters per minute (l/min).
The current volume unit will be displayed and the value will be
flashing to indicate that it can be changed. Rotate the control
knob to change the value between gallons per minute and liters
per minute.
Pressing the Information button once while at this menu will
advance the display to the electricity cost parameter setting.

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INSTALLATION
USING THE DISPLAY
Electricity cost parameter setting
The Tempra Plus has a built-in feature where it calculates the
energy savings of the unit when compared to the average energy
use of a tank-type water heater. In order for this feature to be
accurate, the cost per kWh of electricity must be programmed
into the software.
The secondary display will be flashing to indicate that the value
can be changed by rotating the control knob. Consult your elec-
tricity bill to determine the cost of electricity per kWh.
Pressing the Information button once while at this menu will
advance the display to the display-lock parameter setting.
Display-lock parameter setting
The display can be locked to prevent easy alteration of the tem-
perature setpoint. This menu will flash, indicating that the value
can be changed by rotating the control knob. While "Off" is dis-
played, the lock is not active. The lock is active when the display
reads "On".
If the display-lock parameter is set to "On" and the user either
holds the Information button for 5 seconds or lets the display time
out for 15 seconds, the display-lock will become active.
With the display-lock active, a lock will appear on the base display,
and no parameters can be changed. In order to disable the lock,
hold the Information button for 12 seconds. The lock will then
disappear and all parameters can be changed again.
Pressing the Information button once while at the display-lock
parameter setting menu will move the display onto the factory
setting reset parameter menu.
Factory setting reset parameter
The temperature setpoint, preset values, temperature, & volume
units can all be reset to their factory settings.
The display will be flashing to indicate that the value can be
changed by rotating the control knob. When the value is set to
"On", the reset must be confirmed by holding both Button 1 and
Button 2 simultaneously for 5 seconds.
Pressing the Information button once will advance the display to
the accumulated savings reset parameter menu.
Accumulated savings reset parameter
Much like the factory setting reset parameter, the calculated accu-
mulated savings value can be reset to zero.
The display will be flashing to indicate that the value can be
changed by rotating the control knob. When the value is set to
"On", the reset must be confirmed by holding both Button 1 and
Button 2 simultaneously for 5 seconds.
Pressing the Information button once will advance the display to
the display backlight time-out parameter.

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ENGLISH
INSTALLATION
USING THE DISPLAY
Display backlight time-out parameter
The backlight of the display can be set to be always on, or set to an
automatic mode that deactivates when no user input is detected
for 15 seconds.
The entire display and backlight will be flashing to indicate that
the value can be changed by rotating the control knob. When
the value is set to "On", the backlight will always be on. When
the value is set to "Auto", it will automatically deactivate after 15
seconds of inactivity.
Pressing the Information button once while at this menu wil ad-
vance the display to the backlight display brightness parameter
menu.
Backlight display brightness parameter
The brightness of the display backlight can be adjusted to two
different parameters. A high and low setting allows for user cus-
tomization depending on the light conditions in the installation
location.
The power capacity status bar indicates the brightness setting.
A full capacity bar indicates that the brightness is at the high
setting. A half-full capacity bar indicates that the brightness is at
the low setting.
Pressing the Information button once while at this menu will ad-
vance the display back to the Tmax parameter setting page, labeled
"P1".
5.3.4 Temperature preset options
The Tempra Plus features two temperature preset settings to allow
for quickly accesible setpoints. Button 1 and Button 2 are capable
of each storing an independent setpoint value.
Changing setpoint to preset values
While the display is at the base display, the user can press either
Button 1 or Button 2 to change the setpoint to the buttons stored
value.
Press
P
res
s
When the button is pressed, the setpoint value will change to
whatever value was stored up to that point.
Changing the preset values
The preset values can be changed from the default setpoint values.
Hold 5
seconds
Hol
d
5
s
econ
ds
To change the value of either preset 1 or preset 2, first rotate the
control knob to the temperature that you want to set the preset
value. Then hold the preset button for 5 seconds. The display will
flash to indicate that the preset has been changed successfully.
5.3.5 Returning to the base display
While navigating the display and on any menu other than the base
display, holding the Information button for 5 seconds will return
the display to the base display. Additionally, the display will revert
to the base display after a 15 second period with no user input.
5.3.6 Tempra Plus error menu
If the Tempra plus encounters an error, a wrench will illuminate
in the bottom left of the display.
Press
P
res
s
While the wrench is showing, press the Information button to
advance the display to the error display page. Consult section
“Tempra Plus error code reporting”, pg. 14 for information on
how to interpret the reported error code.

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INSTALLATION
INSTALLATION CONFIGURATION
INSTALLATION
6. Installation configuration
The Tempra can be used for the following applications.
6.1 Typical residential installation
6.2 Typical commercial installation
7. Mounting the unit
!NOTICE: Unit must be installed in a vertical position
with the water fittings pointing downward.
WARNING: Do not install unit where it would routinely
be splashed with water. Electric shock may result.
CAUTION: Hot water outlet pipes leaving unit can be
hot to the touch. Insulation must be used for hot water
pipes below 36" (0.9 m) due to burn risk to children.
!NOTICE: This unit should not be installed in a location
where it may be exposed to temperatures less than
36°F (2°C). If the unit may be subject to freezing tem-
peratures all water must be drained from the unit.
Failure to comply with this instruction voids all war-
ranties.
The unit should be located in an area where water
leakage from the unit or connections will not result in
damage to the area adjacent to the unit. If such a loca-
tion cannot be avoided it is recommended that a drain
pan be installed under the unit.
7.1 Mounting dimensions
A
B
C
D
EF
G
Dimensions
A⅜ (10 mm)
B12½ (318 mm)
C1 (26 mm)
D¾ (20 mm)
E7½ (190 mm)
F7½ (190 mm)
G3/16 (5 mm)
7.2 Mounting instructions
Install Tempra as close as possible to the main hot water draw-
off points.
fInstall Tempra in a frost free area. If frost might occur, re-
move unit before freezing temperatures set in.
fLeave a minimum of 5" (120 mm) of clearance on all sides for
servicing.

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ENGLISH
INSTALLATION
WATER CONNECTIONS
fRemove the cover screw.
fOpen the front cover.
11
1
1 Mounting holes
fMount unit securely to wall by putting at least three screws
through mounting holes. Screws and plastic wall anchors for
mounting on masonry or wood are provided.
8. Water connections
!NOTICE: Excessive heat from soldering on copper pipes
near the Tempra may cause damage.
The cold water connection to the unit must be discon-
nected periodically in order to clean the filter screen.
It is required to use water connections that are easily
detachable such as braided steel flex connectors.
!NOTICE: Hard water or water with a high mineral
count may damage the unit. Damage to the unit caused
by scale or a high mineral count is not covered under
the warranty.
fAll plumbing work must comply with national and applicable
state and local plumbing codes.
fA pressure reducing valve must be installed if the cold water
supply pressure exceeds 150 PSI (10 bar).
fMake certain that the cold water supply line has been flushed
to remove any scale and dirt.
fThe Tempra unit has a built in filter screen that should be
cleaned from time to time. Clean screen and put the screen
and the washer back into their original position.
1
2
1 Filter screen
2 Washer
fThe cold water connection (inlet) is on the right side of the
unit, and the hot water connection (outlet) is on the left side
of the unit.
!NOTICE: Tankless water heaters such as the Tempra
are not required to be equipped with a temperature
and pressure relief valve (T&P). If the local inspector
will not pass the installation without a T&P, it should
be installed on the hot water outlet side of the unit.
fThe Tempra on the hot side is designed for connection to
copper tubing, PEX tubing or a braided stainless steel hose
with a 3/4" NPT female tapered thread.
fThe plumbing on the cold water inlet side needs to be such
that it can easily be removed to allow access to the inlet filter
screen. The easiest way to achieve this is to us a stainless
steel braided hose connector. If soldering near the unit is
necessary, please direct the flame away from the housing of
the unit in order to avoid damage.
fWhen all plumbing work is completed, check for leaks and
take corrective action before proceeding.

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INSTALLATION
ELECTRICAL CONNECTION
9. Electrical connection
WARNING: Electrocution
Before beginning any work on the electric installation,
be sure that main breaker panel switches are "Off"
to avoid any danger of electric shock. All mounting
and plumbing must be completed before proceeding
with electrical hook-up. Where required by local,
state or national electrical codes the circuits should be
equipped with a "ground fault interrupter".
The unit must be properly grounded in accordance
with state and local codes, or in absence of such
codes, in accordance with national electric code or the
Canadian electric code. Failure to electrically ground
the product could result in serious personal injury or
death.
The Tempra should be connected to properly grounded dedicated
branch circuits of proper voltage rating. Ground must be brought
to the "Ground" at the circuit breaker panel.
9.1 Circuit Layout
9.1.1 Tempra 12 Trend / Plus
OFF
ON
OFF
ON
26_02_02_0568
CKT 1
Tempra 12 Trend / Plus: These units can be connected to a single circuit.
Use a supply cable protected by a double pole breaker.
9.1.2 Tempra 15, 20, 24 Trend / Plus
OFF
ON
OFF
ON
OFF
ON
OFF
ON
26_02_02_0568
CKT 1 CKT 2
Tempra 15, 20 or 24 Trend / Plus: These units require two independent
circuits. Use two supply cables protected by two separate double
pole breakers.

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ENGLISH
INSTALLATION
COMMISSIONING THE WATER HEATER
9.1.3 Tempra 29, 36 Trend / Plus
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
26_02_02_0568 26_02_02_0881
CKT 1 CKT 2 CKT 3
Tempra 29 or 36 Trend / Plus These units require three independent
circuits. Use three supply cables protected by three separate double
pole breakers.
9.2 Circuit Connection
Please refer to the technical data table for the correct wire and
circuit breaker size. In all cases, make sure that the unit is properly
grounded.
fCut the electrical connection cable to length and strip.
15˝ (380mm)
26_02_02_0893
The wire must be fed through the knock-outs located between
the hot and cold water connections (See 9.1, “Circuit Layout”,
pg. 12). The "live" wires must be connected to the slots on the
terminal block marked L1 and L2. The ground wire must be con-
nected to slot marked with the ground symbol (See 13.5, “Wiring
Diagrams”, pg. 19).
9.3 Terminal block
Consult the chart below for the recommended torque amounts on
the terminal block screws.
Screw Size (mm) Min. Torque (N•cm) Min. Torque (lbf•in)
M6 200-250 17.7-22.1
Using the proper torque specifications to secure wire to the wiring
block helps to avoid personal loss or property damage.
10. Commissioning the water heater
!WARNING: Open the hot water faucet for a few min-
utes until water flow is continuous and all air is
purged from water pipes. The unit’s cover must be
installed before the circuit breakers are turned on.
fFill the unit up completely with water.
fClose the cover and fix it using the screw with the lock
washer.
fTurn on circuit breakers to bring electrical power to the unit.
fAdjust the water temperature to the desired level using the
knob on the front cover of the unit.
fTurn on hot water and wait twenty seconds until temperature
has stabilized.
fCheck the water temperature with your hand and make sure
that it does not feel too hot. Reduce if necessary.
fExplain to the user how the unit works and familiarize them
with its use.
fAdvise the user about possible hazards (hot water tempera-
ture up to 140°F (60°C)). Hand over these instructions, to be
kept for future reference.
11. Normal maintenance
!NOTICE: The Tempra does not contain any parts ser-
viceable by the average user. In case of malfunction
please contact a licensed plumber or electrician.
Stiebel Eltron Tempra tankless water heaters are designed for a
very long service life. Actual life expectancy will vary with water
quality and use. To ensure consistent water flow, it is recommend-
ed to periodically remove scale and dirt that may build up at the
aerator of the faucet(s), the filter screen in the unit, or the heating
canisters of the water heater.
Periodically check the water quality supplied to the water heater.
Water quality can have an impact on appliance longevity and may
not be covered under the manufacturer's warranty.

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INSTALLATION
TROUBLESHOOTING
12. Troubleshooting
Symptom Possible cause Solution
No hot water circuit breakers off turn circuit breakers on
not enough flow rate to acti-
vate unit
clean filter screen at unit
clean faucet aerator or
shower head
flow sensor clogged/not
spinning
remove flow sensor and
blow through it to make sure
wheel is spinning
water heater not plumbed
correctly
ensure cold water entering
on right side and hot outlet
exiting on left side
Not enough hot
water/restricted
hot water flow
filter screen clogged clean filter screen at unit
scale built up on heating
elements
descale the heating elements
using a descaling solution
Water not hot
enough
water flow rate too high reduce water flow rate until
power light on front cover
stops blinking
voltage too low supply correct voltage to unit
safety thermal cutout has
tripped
turn off power supply, reset
safety thermal cutout
If you are not able to resolve a problem please contact us toll free at
800-582-8423 before removing the unit from the wall.
Stiebel Eltron is happy to provide technical assistance. In most
instances, we can resolve the problem over the phone.
12.1 Tempra Plus error code reporting
The Tempra Plus features the capability to self-diagnose and
report operational issues that it encounters. For information on
how the error will be shown on the Tempra Plus display see the
section “Tempra Plus error menu”, pg. 9.
Error Cause Solution
2 inlet temperature sensor failure contact Stiebel Eltron techni-
cal support.
3 outlet temperature sensor
failure
ensure the outlet temperature
sensor cable is connected to
the main control board
contact Stiebel eltron techni-
cal support
12.2 Resetting the safety thermal cutout
DANGER: Electrocution
Do not attempt to reset the safety thermal cutout of
this water heater unless power to the unit has been
completely shut off at the circuit breakers.
The safety thermal cutout on the Tempra is designed to cut off
electrical power to the heating elements if water of a too high
temperature is encountered. When one of these safety cutouts
have tripped, they must be reset manually.
1
1 Thermal safety cutouts
To reset the safety cutouts, follow the following procedure:
fTurn off all circuit breakers attached to the water heater
fOpen the front cover of the water heater
fIdentify the safety thermal cutouts on the top of the cop-
per heating canisters. The buttons at the top are the reset
buttons.
fPress down on the buttons, take note of whether they click
when pressed or not.
A heating canister that needs to be repeatedly reset may have a
technical issue that should be addressed by Stiebel Eltron tech-
nical support.

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ENGLISH
INSTALLATION
TECHNICAL DATA
13. Technical Data
13.1 Tempra Trend
Tempra 12
Trend Tempra 15 Trend Tempra 20 Trend Tempra 24 Trend3Tempra 29 Trend4Tempra 36 Trend5
Part number 239213 239214 239215 239216 239217 239218
Electrical details
Phase single 50/60 Hz single650/60 Hz single650/60 Hz single650/60 Hz single650/60 Hz single650/60 Hz
Voltage 240 V 208 V 240 V 208 V 240 V 208 V 240 V 208 V 240 V 208 V 240 V 208 V
Wattage 12 kW 9 kW 14.4 kW 10.8 kW 19.2 kW 14.4 kW 24 kW 18 kW 28.8 kW 21.6 kW 36 kW 27 kW
Max. amp. load 1 x 50 A 1 x 44 A 2 x 30 A 2 x 26 A 2 x 40 A 2 x 35 A 2 x 50 A 2 x 44 A 3 x 40 A 3 x 35 A 3 x 50 A 3 x 44 A
Number & min. recommended size of circuit
breakers1(DP) 1 x 50 A 2 x 30 A 2 x 40 A 2 x 35 A 2 x 50 A 3 x 40 A 3 x 35 A 3 x 50 A
Power connection 1/N/GRD 2/GRD 2/GRD 2/GRD 3/GRD 3/GRD
Min. recommended wire size (copper)21 x 6/2 AWG 2 x 10/2 AWG 2 x 8/2 AWG 2 x 6/2 AWG 3 x 8/2 AWG 3 x 6/2 AWG
Connections
Water connection 3/4“ NPT
Max. cold water temperature 108°F (42°C)
Hydraulic data
Rated capacity 0.13 gal (0.5 l) 0.26 gal (1.0 l) 0.26 gal (1.0 l) 0.26 gal (1.0 l) 0.39 gal (1.5 l) 0.39 gal (1.5 l)
Values
Min. water flow to activate unit 0.37 gpm
(1.4 l/min)
0.5 gpm
(1.9 l/min)
0.5 gpm
(1.9 l/min)
0.5 gpm
(1.9 l/min)
0.77 gpm
(2.9 l/min)
0.77 gpm
(2.9 l/min)
Max. permissible inlet temperature 131°F (55°C)
Application limits
Min. permissible pressure 30 PSI (0.2 MPa)
Max. permissible pressure 150 PSI (1.0 MPa)
Test pressure 300 PSI (2.0 MPa)
Versions
Cap and back panel sheet steel
Color alpine white
Dimensions
Height 14.52 in (369 mm)
Width 16.54 in (420 mm)
Depth 4.61 in (117 mm)
Weights
Weight 13.5 lbs (6.1 kg) 16.1 lbs (7.3 kg) 16.1 lbs (7.3 kg) 16.1 lbs (7.3 kg) 19 lbs (8.6 kg) 19 lbs (8.6 kg)
1This is our recommendation for overcurrent protection sized at 100% of load. Check local codes for compliance if necessary.
2Copper must be used. Conductors should be sized to maintain a voltage drop of less than 3% under load.
3Requires a 150 A main service.
4Requires a 200 A main service.
5Requires a 300 A main service.
629 Trend & 36 Trend may be wired for balanced 3-phase 208 V. 15 Trend, 20 Trend, 24 Trend may be wired for unbalanced 3-phase 208 V.

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INSTALLATION
TECHNICAL DATA
13.2 Tempra Plus
Tempra 12 Plus Tempra 15 Plus Tempra 20
Plus Tempra 24 Plus3Tempra 29 Plus4Tempra 36 Plus5
Part number 239219 239220 239221 239222 239223 239225
Electrical details
Phase single 50/60 Hz single650/60 Hz single650/60 Hz single650/60 Hz single650/60 Hz single650/60 Hz
Voltage 240 V 208 V 240 V 208 V 240 V 208 V 240 V 208 V 240 V 208 V 240 V 208 V
Wattage 12 kW 9 kW 14.4 kW 10.8 kW 19.2 kW 14.4 kW 24 kW 18 kW 28.8 kW 21.6 kW 36 kW 27 kW
Max. amp. load 1 x 50 A 1 x 44 A 2 x 30 A 2 x 26 A 2 x 40 A 2 x 35 A 2 x 50 A 2 x 44 A 3 x 40 A 3 x 35 A 3 x 50 A 3 x 44 A
Number & min. recommended size of circuit
breakers1(DP) 1 x 50 A 2 x 30 A 2 x 40 A 2 x 35 A 2 x 50 A 3 x 40 A 3 x 35 A 3 x 50 A
Power connection 1/N/GRD 2/GRD 2/GRD 2/GRD 3/GRD 3/GRD
Min. recommended wire size (copper)21 x 6/2 AWG 2 x 10/2 AWG 2 x 8/2 AWG 2 x 6/2 AWG 3 x 8/2 AWG 3 x 6/2 AWG
Connections
Water connection 3/4“ NPT
Max. cold water temperature 108°F (42°C)
Hydraulic data
Rated capacity 0.13 gal (0.5 l) 0.26 gal (1.0 l) 0.26 gal (1.0 l) 0.26 gal (1.0 l) 0.39 gal (1.5 l) 0.39 gal (1.5 l)
Values
Min. water flow to activate unit 0.37 gpm
(1.4 l/min)
0.5 gpm
(1.9 l/min)
0.5 gpm
(1.9 l/min)
0.5 gpm
(1.9 l/min)
0.77 gpm
(2.9 l/min)
0.77 gpm
(2.9 l/min)
Max. permissible inlet temperature 131°F (55°C)
Application limits
Min. permissible pressure 30 PSI (0.2 MPa)
Max. permissible pressure 150 PSI (1.0 MPa)
Test pressure 300 PSI (2.0 MPa)
Versions
Cap and back panel sheet steel
Color alpine white
Dimensions
Height 14.52 in (369 mm)
Width 16.54 in (420 mm)
Depth 4.61 in (117 mm)
Weights
Weight 13.5 lbs (6.1 kg) 16.1 lbs (7.3 kg) 16.1 lbs (7.3 kg) 16.1 lbs (7.3 kg) 19 lbs (8.6 kg) 19 lbs (8.6 kg)
1This is our recommendation for overcurrent protection sized at 100% of load. Check local codes for compliance if necessary.
2Copper must be used. Conductors should be sized to maintain a voltage drop of less than 3% under load.
3Requires a 150 A main service.
4Requires a 200 A main service.
5Requires a 300 A main service.
6Tempra 29 Plus & 36 Plus may be wired for balanced 3-phase 208V. Tempra 15 Plus, 20 Plus, 24Plus may be wired for unbalanced 3-phase 208V.

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ENGLISH
INSTALLATION
TECHNICAL DATA
13.3 Temp. increase above ambient water temp.
Hot water flow rate [ GPM ] Hot water flow rate [ l/m ]
Hot water outlet temperature 105°F Hot water outlet temperature 40°C
Cold water inlet temp. 39°F 59°F 77°F 95°F 113°F 131°F 4°C 15°C 25°C 35°C 45°C 55°C
Tempra 12 Trend
/ Tempra 12 Plus
9 kW @ 208 V 0.95 1.36 2.27 6.61 - - 3.58 5.16 8.59 25.00 - -
12 kW @ 220-240 V 1.26 1.82 3.03 6.61 - - 4.77 6.87 11.46 25.00 - -
Tempra 15 Trend
/ Tempra 15 Plus
10.8 kW @ 208 V 1.14 1.63 2.72 6.61 - - 4.30 6.19 10.31 25.00 - -
14.4 kW @ 220-240 V 1.51 2.18 3.63 6.61 - - 5.73 8.25 13.75 25.00 - -
Tempra 20 Trend
/ Tempra 20 Plus
14.4 kW @ 208 V 1.51 2.18 3.63 6.61 - - 5.73 8.25 13.75 25.00 - -
19.2 kW @ 220-240 V 2.02 2.91 4.84 6.61 - - 7.64 11.00 18.33 25.00 - -
Tempra 24 Trend
/ Tempra 24 Plus
18 kW @ 208 V 1.89 2.72 4.54 6.61 - - 7.16 10.31 17.18 25.00 - -
24 kW @ 220-240 V 2.52 3.63 6.05 6.61 - - 9.55 13.75 22.91 25.00 - -
Tempra 29 Trend
/ Tempra 29 Plus
21.6 kW @ 208 V 2.27 3.27 5.45 6.61 - - 8.59 12.37 20.62 25.00 - -
28.8 kW @ 220-240 V 3.03 4.36 6.61 6.61 - - 11.46 16.50 25.00 25.00 - -
Tempra 36 Trend
/ Tempra 36 Plus
27 kW @ 208 V 2.84 4.09 6.61 6.61 - - 10.74 15.47 25.00 25.00 - -
36 kW @ 220-240 V 3.78 5.45 6.61 6.61 - - 14.32 20.62 25.00 25.00 - -
Hot water flow rate [ GPM ] Hot water flow rate [ l/m ]
Hot water outlet temperature 113°F Hot water outlet temperature 45°C
Cold water inlet temp. 39°F 59°F 77°F 95°F 113°F 131°F 4°C 15°C 25°C 35°C 45°C 55°C
Tempra 12 Trend
/ Tempra 12 Plus
9 kW @ 208 V 0.83 1.14 1.70 3.41 6.61 -3.14 4.30 6.44 12.89 25.00 -
12 kW @ 220-240 V 1.11 1.51 2.27 4.54 6.61 -4.19 5.73 8.59 17.18 25.00 -
Tempra 15 Trend
/ Tempra 15 Plus
10.8 kW @ 208 V 1.00 1.36 2.04 4.09 6.61 -3.77 5.16 7.73 15.47 25.00 -
14.4 kW @ 220-240 V 1.33 1.82 2.72 5.45 6.61 -5.03 6.87 10.31 20.62 25.00 -
Tempra 20 Trend
/ Tempra 20 Plus
14.4 kW @ 208 V 1.33 1.82 2.72 5.45 6.61 -5.03 6.87 10.31 20.62 25.00 -
19.2 kW @ 220-240 V 1.77 2.45 3.63 6.61 6.61 -6.71 9.16 13.75 25.00 25.00 -
Tempra 24 Trend
/ Tempra 24 Plus
18 kW @ 208 V 1.66 2.27 3.41 6.61 6.61 -6.29 8.59 12.89 25.00 25.00 -
24 kW @ 220-240 V 2.21 3.03 4.54 6.61 6.61 -8.38 11.46 17.18 25.00 25.00 -
Tempra 29 Trend
/ Tempra 29 Plus
21.6 kW @ 208 V 1.99 2.72 4.09 6.61 6.61 -7.54 10.31 15.47 25.00 25.00 -
28.8 kW @ 220-240 V 2.66 3.63 5.45 6.61 6.61 -10.06 13.75 20.62 25.00 25.00 -
Tempra 36 Trend
/ Tempra 36 Plus
27 kW @ 208 V 2.49 3.41 5.11 6.61 6.61 -9.43 12.89 19.33 25.00 25.00 -
36 kW @ 220-240 V 3.32 4.54 6.61 6.61 6.61 -12.57 17.18 25.00 25.00 25.00 -
Hot water flow rate [ GPM ] Hot water flow rate [ l/m ]
Hot water outlet temperature 140°F Hot water outlet temperature 60°C
Cold water inlet temp. 39°F 59°F 77°F 95°F 113°F 131°F 4°C 15°C 25°C 35°C 45°C 55°C
Tempra 12 Trend
/ Tempra 12 Plus
9 kW @ 208 V 0.61 0.76 0.97 1.36 2.27 6.61 2.30 2.86 3.68 5.16 8.59 25.00
12 kW @ 220-240 V 0.81 1.01 1.30 1.82 3.03 6.61 3.07 3.82 4.91 6.87 11.46 25.00
Tempra 15 Trend
/ Tempra 15 Plus
10.8 kW @ 208 V 0.73 0.91 1.17 1.63 2.72 6.61 2.76 3.44 4.42 6.19 10.31 25.00
14.4 kW @ 220-240 V 0.97 1.21 1.56 2.18 3.63 6.61 3.68 4.58 5.89 8.25 13.75 25.00
Tempra 20 Trend
/ Tempra 20 Plus
14.4 kW @ 208 V 0.97 1.21 1.56 2.18 3.63 6.61 3.68 4.58 5.89 8.25 13.75 25.00
19.2 kW @ 220-240 V 1.30 1.61 2.08 2.91 4.84 6.61 4.91 6.11 7.86 11.00 18.33 25.00
Tempra 24 Trend
/ Tempra 24 Plus
18 kW @ 208 V 1.22 1.51 1.95 2.72 4.54 6.61 4.60 5.73 7.36 10.31 17.18 25.00
24 kW @ 220-240 V 1.62 2.02 2.59 3.63 6.05 6.61 6.14 7.64 9.82 13.75 22.91 25.00
Tempra 29 Trend
/ Tempra 29 Plus
21.6 kW @ 208 V 1.46 1.82 2.33 3.27 5.45 6.61 5.52 6.87 8.84 12.37 20.62 25.00
28.8 kW @ 220-240 V 1.95 2.42 3.11 4.36 6.61 6.61 7.36 9.16 11.78 16.50 25.00 25.00
Tempra 36 Trend
/ Tempra 36 Plus
27 kW @ 208 V 1.82 2.27 2.92 4.09 6.61 6.61 6.90 8.59 11.05 15.47 25.00 25.00
36 kW @ 220-240 V 2.43 3.03 3.89 5.45 6.61 6.61 9.21 11.46 14.73 20.62 25.00 25.00

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INSTALLATION
TECHNICAL DATA
13.4 Dimensions
Tempra Trend / Tempra Plus
A
B
C
D
E
Tempra Trend Tempra Plus
Dimensions
A14½ (369 mm)
B4½ (114 mm)
C¾ (18 mm)
D 811 /16  (220 mm)
E16½ (422 mm)

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ENGLISH
INSTALLATION
TECHNICAL DATA
13.5 Wiring Diagrams
13.5.1 Tempra 12 Trend / Plus
CKT 1
642
531
6
11/12
5
4
9/10
3
2
7/8
1
13
6
4
2
5
3
1
14 15
D0000039679
13.5.2 Tempra 15, 20 Trend / Plus
CKT 1 CKT 2
42
51
42
51
6
11/12
5
4
9/10
3
2
7/8
1
13
4
2
5
1
14 15
D0000039678
13.5.3 Tempra 24 Trend / Plus
CKT 1 CKT 2
642
531
642
531
6
11/12
5
4
9/10
3
2
7/8
1
13
6
4
2
5
3
1
14 15
D0000039677
13.5.4 Tempra 29 Trend / Plus
CKT 1 CKT 2 CKT 3
42
51
42
51
42
51
6
11/12
5
4
9/10
3
2
7/8
1
13
4
2
5
1
14 15
D0000039676
13.5.5 Tempra 36 Trend / Plus
CKT 1 CKT 2 CKT 3
642
531
642
531
642
531
6
4
2
5
3
1
6
11/12
5
4
9/10
3
2
7/8
1
13 14 15
D0000039675

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INSTALLATION
SPARE PARTS
14. Spare parts
Spare part No.
1234567
Housing Temp. control knob Wiring block Heating system Safety thermal
cut out
Electronic control
device
Flow sensor
Tempra 12 Trend 331894 323686 279998 286360 286369 286375 332567
Tempra 15 Trend 331894 323686 279997 286361 286369 286845 332567
Tempra 20 Trend 331894 323686 279997 286362 286369 286845 332567
Tempra 24 Trend 331894 323686 279997 286364 286369 286376 332567
Tempra 29 Trend 331894 323686 279996 286373 286369 286378 332567
Tempra 36 Trend 331894 323686 279996 286374 286369 286379 332567
Tempra 12 Plus 331926 323686 279998 286360 286369 286375 332567
Tempra 15 Plus 331926 323686 279997 286361 286369 286845 332567
Tempra 20 Plus 331926 323686 279997 286362 286369 286845 332567
Tempra 24 Plus 331926 323686 279997 286364 286369 286376 332567
Tempra 29 Plus 331926 323686 279996 286373 286369 286378 332567
Tempra 36 Plus 331926 323686 279996 286374 286369 286379 332567
Spare part No.
8 9 10 11 12 13 14 15
Plumbing con-
nection 3/4"
Advanced Flow
Control Electronic temp. control Temperature sensor Filter screen Set point case Inlet pipe elbow Valve assembly
Tempra 12 Trend 278698 --- 331933 280677 056755 326141 278695 ---
Tempra 15 Trend 278698 --- 331933 280677 056755 326141 278695 ---
Tempra 20 Trend 278698 --- 331933 280677 056755 326141 278695 ---
Tempra 24 Trend 278698 --- 331933 280677 056755 326141 278695 ---
Tempra 29 Trend 278698 --- 331933 280677 056755 326141 278695 ---
Tempra 36 Trend 278698 --- 331933 280677 056755 326141 278695 ---
Tempra 12 Plus 278698 220502 331934 280677 056755 326141 --- 280622
Tempra 15 Plus 278698 220502 331934 280677 056755 326141 --- 280622
Tempra 20 Plus 278698 220502 331934 280677 056755 326141 --- 280622
Tempra 24 Plus 278698 220502 331934 280677 056755 326141 --- 280622
Tempra 29 Plus 278698 220502 331934 280677 056755 326141 --- 280622
Tempra 36 Plus 278698 220502 331934 280677 056755 326141 --- 280622