STIEBEL ELTRON MINI-E 2-1 Instruction Manual

OPERATION AND INSTALLATION
OPERACIÓN E INSTALACIÓN
UTILISATION ET INSTALLATION
THERMOSTATIC POINT-OF-USE TANKLESS ELECTRIC WATER HEATER
CALENTADOR DE AGUA ELÉCTRICO SIN TANQUE CON CONTROL TERMOSTÁTICO DE TEMPERATURA
CHAUFFE-EAU INSTANTANÉ THERMOSTATIQUES POUR POINT D’UTILISATION
» MINI™-E 2-1
» MINI™-E 2.5-1
» MINI™-E 3-1
» MINI™-E 3.5-1
» MINI™-E 4-2
» MINI™-E 6-2
Conforms to ANSI/UL Std. 499
Certified to CAN/CSA Std. E335-1 & E335-2-35
Conforme a ANSI/UL Std. 499
Certificación con CAN/CSA Std. E335-1 & E335-2-35
Conforme à la norme ANSI/UL Std. 499
Certifié à la norme CAN/CSA Std. E335-1 & E335-2-35
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.

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TABLE OF CONTENTS
SPECIAL INFORMATION
OPERATION
1. General information ___________________________________________ 3
1.1 Safety instructions__________________________________________________ 4
1.2 Other symbols in this documentation __________________________ 4
2. Safety____________________________________________________________ 5
2.1 Intended use_________________________________________________________ 5
2.2 General safety instructions _______________________________________ 5
3. Register your product _________________________________________ 6
4. Appliance description _________________________________________ 6
5. Adjustment______________________________________________________ 7
6. Cleaning, care and maintenance _____________________________ 7
INSTALLATION
7. Safety____________________________________________________________ 8
7.1 General safety instructions _______________________________________ 8
8. Appliance description _________________________________________ 8
8.1 Standard delivery___________________________________________________ 8
8.2 Optional accessories _______________________________________________ 8
9. Preparations____________________________________________________ 8
10. Installation______________________________________________________ 9
10.1 Installation site______________________________________________________ 9
10.2 Installation configuration _________________________________________ 9
10.3 Connecting the power supply ___________________________________11
11. Commissioning ________________________________________________12
11.1 Initial start-up______________________________________________________12
11.2 Appliance handover_______________________________________________12
11.3 Recommissioning__________________________________________________13
11.4 Settings ______________________________________________________________13
12. Shutting down_________________________________________________14
13. Troubleshooting _______________________________________________14
14. Maintenance ___________________________________________________ 16
15. Specification ___________________________________________________ 17
15.1 Dimensions and connections____________________________________17
15.2 Wiring diagram ____________________________________________________18
15.3 Temperature rise table ___________________________________________19
15.4 Data table ___________________________________________________________20
16. Spare parts list ________________________________________________22
17. Warranty _______________________________________________________23

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GENERAL INFORMATION
SPECIAL INFORMATION
- Ensure the appliance can be separated from the
power supply by a circuit breaker that disconnects
all poles.
- If the power cable is damaged, it must only be
replaced by a qualified contractor and the repair
must be authorized by Stiebel Eltron using the
original spare part.
- Secure the appliance as described in the section
“Installation”, pg. 8.
- Observe the maximum permissible pressure
described in section 15.4, “Data table”, pg. 20.
- Drain the appliance as described in the section
“Draining the appliance”, pg. 16.
OPERATION
1. General information
The chapter "Operation" is intended for homeowners, heating
contractors, plumbers and electricians.
The chapter "Installation" is intended for heating contractors, plumb-
ers and electricians only.
Note:
Read these instructions carefully before using the appliance
and retain them for future reference.
Pass on the instructions to a new user if required.

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GENERAL INFORMATION
1.1 Safety instructions
1.1.1 Structure of safety instructions
KEYWORD: Type of risk
Here, possible consequences are listed that may result
from failure to observe the safety instructions.
f Steps to prevent the risk are listed.
1.1.2 Symbols, type of risk
Symbol Type of risk
Injury
Electrocution
Burns or scalding
1.1.3 Keywords
KEYWORD Meaning
DANGER Failure to observe this information will result in serious
injury or death.
WARNING Failure to observe this information may result in serious
injury or death.
CAUTION Failure to observe this information may result in non-serious
or minor injury.
1.2 Other symbols in this documentation
Note:
Notes are bordered by horizontal lines above and below
the text. General information is identified by the symbol
shown on the left.
Symbol
Material losses
(appliance damage, consequential losses and environmental
pollution)
Appliance disposal
!
!

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SAFETY
2. Safety
2.1 Intended use
This appliance is intended for residential use. It can be used safely
by untrained persons. The appliance can also be used in a non-res-
idential environment, e.g. in a small business, as long as it is used
in the same way.
This appliance is suitable for heating domestic hot water (DHW)
or for heating preheated water. The appliance is designed for one
hand-washing sink.
Note:
The Mini-E 6-2 is the only Mini-E model which is designed
to supply hot water to one OR two hand-washing sinks.
Plumbing any other Mini-E model to more than one
hand-washing sink shall be deemed inappropriate.
Any other use beyond that described shall be deemed inappropriate.
Observation of these instructions and of instructions for any acces-
sories used is also part of the correct use of this appliance.
2.2 General safety instructions
DANGER: Scalding
During operation, the tap can reach temperatures in excess
of 122°F (50°C). There is a risk of scalding at outlet temper-
atures in excess of 109 °F (43 °C).
DANGER: Electrocution
Any damaged power cables must be replaced by a qual-
ified electrician. This prevents potential hazards due to
improper installation.
!
Material losses:
Protect the appliance and the tap against freezing.
!
Material losses:
Only use the provided aerator(s). Prevent scale build-up at
the tap outlets (See chapter 6, “Cleaning, care and main-
tenance”, pg. 7).

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REGISTER YOUR PRODUCT
3. Register your product
You must register this product within 90 days of
purchase on our web site in order to activate the stan-
dard warranty or to be eligible for the extended warran-
ty. Go to our website 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: Mini-E 6-2 (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 registration process or
warranty options, please contact Stiebel Eltron USA directly at
800.582.8423.
4. Appliance description
This thermostatically controlled tankless electric water heater main-
tains a constant outlet temperature up to its output limit, regardless
of the inlet temperature.
This appliance has been factory-set to 100 °F (38 °C). Once this
temperature has been reached, the main control board automat-
ically maintains this temperature. The output is matched to the set
temperature and prevents this temperature from being exceeded.
The appliance heats the water directly at the draw-off point as soon
as the tap is opened. Short pipe runs ensure that energy and water
losses are minimal.
The DHW output temperature depends on the cold water tempera-
ture, water heater capacity and the flow rate.
The Advanced Direct Coil™heating system is suitable for hard and
soft water areas. This heating system has a low susceptibility to scale
build-up. The heating system ensures quick and efficient hot water
provided at the point-of-use.
Your qualified contractor can adjust the maximum temperature
setting (see 11.4, “Settings”, pg. 13).
You must use the aerator provided with the appliance.

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ADJUSTMENT
If you have questions regarding the way you plan to use this device,
please call our technical service line at 800.582.8423 (USA and Cana-
da).
For service outside the U.S. and Canada, please call us at 413.247.3380.
You can also e-mail us at [e-mail] or fax us at
413.247.3369.
5. Adjustment
The appliance heating system switches on automatically as soon as
you open the tap. The water is heated. The water temperature can
be adjusted at the tap:
To increase the temperature
f Reduce the flow rate at the tap.
To reduce the temperature
f Open the tap further or add more cold water.
Following an interruption of the water supply
See 11.3, “Recommissioning”, pg. 13.
6. Cleaning, care and maintenance
f Never use abrasive or corrosive cleaning agents. A damp cloth
is sufficient for cleaning the outside of the appliance.
f Check the taps/valves regularly. Lime-scale deposits can be
removed using commercially available descaling agents.
f Have the electrical safety of the appliance periodically checked
by an electrician.
f Regularly descale or replace the provided aerator(s) (See 8.2,
“Optional accessories”, pg. 8).

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SAFETY
INSTALLATION
7. Safety
Only a qualified contractor should carry out installation, commis-
sioning, maintenance and repair of the appliance.
7.1 General safety instructions
We guarantee trouble-free function and operational reliability only
if original accessories and spare parts intended for the appliance
are used.
!
Material losses:
Observe the max. permissible inlet temperature. Higher
temperatures may damage the appliance. You can limit the
inlet temperature by means of a central thermostatic valve
(See 8.2, “Optional accessories”, pg. 8).
Note:
Observe all applicable national, state & local regulations
codes, and instructions.
8. Appliance description
8.1 Standard delivery
The following are delivered with the appliance:
- Filter screen in the cold water inlet
-Aerator(s)
- Power cable
8.2 Optional accessories
Mini-E TLC - Thermostatic mixing valve
For ASSE 1070-2004 compliance, use optional Mini-E TLC kit available
from Stiebel Eltron.
Visit www.stiebel-eltron-usa.com for more information.
9. Preparations
f Flush the water line thoroughly.
Water installation
A safety valve is not required by Stiebel Eltron, but one may be
required by local plumbing code. Check the codes before installation.

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INSTALLATION
Note:
Installing the supplied aerator(s) is required, and provides
optimum water flow.
10. Installation
10.1 Installation site
Do not install in an area that can be exposed to temperatures below
41 °F (5 °C).
Ensure access to the opening screws on both sides of the cover so
that they can be easily removed if service is necessary.
The appliance is suitable for an undersink or oversink installation. It
can be installed with water connections at the top or at the bottom.
DANGER: Electrocution
The adjustment screw for setting the temperature is live,
and the IP25 protection is only given when the appliance
back panel is fitted.
10.2 Installation configuration
10.2.1 Typical installation
26_02_05_0093
1
2
1 Tee
2 Shut-off valve
3 Aerator
3

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INSTALLATION
10.2.2 Appliance installation
Note:
f Mount the appliance on the wall.
The wall must have a sufficient load-bearing capacity for
the weight of the device.
d
c
e
26_02_05_0083
1 Undo the cover screws by two turns.
2 Undo the snap fastener using a screwdriver.
3 Remove the appliance cover with the heater towards the front.
26_02_05_0084
1
1 Knockout for hard-wiring
f Using pliers, break out the knock-out for the power cable in the
appliance cover. Correct the contours with a file if necessary.
f Use the appliance back panel as a drilling template.
f Secure the appliance back panel to the wall with suitable plugs
and screws.

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INSTALLATION
d
c
e
26_02_05_0085
1 Hook in the appliance cover
2 Click the heater into place using the snap fastener.
3 Secure the appliance cover with the cover fastening screws.
Faucet installation
f Install the connections to the faucet. For this, also observe the
faucet operating and installation instructions.
!
Material losses:
f When making the connections, counter the torque on
the appliance using a 14 mm wrench.
10.3 Connecting the power supply
DANGER: Electrocution
Carry out all electrical connection and installation work in
accordance with national, state & local regulations.
DANGER: Electrocution
Ensure that the appliance is grounded.
Ensure the appliance can be separated from the power
supply by a circuit breaker that disconnects all poles.

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COMMISSIONING
DANGER: Electrocution
The appliances are delivered with a power cable to be
connected to a permanent power supply.
Ensure that the proper wire gauge is installed with the
appliance in accordance with the minimum recommended
wire size in section 15.4, “Data table”, pg. 20.
!
Material losses:
When making the connection to a standard wall socket,
ensure that the socket is freely accessible to be easily
disconnected in case of an issue.
!
Material losses:
Take note of the product label. The specified voltage must
match the mains voltage.
f If the appliance is to be hardwired, connect the power cable as
shown in the wiring diagram (see 15.2, “Wiring diagram”, pg.
18).
11. Commissioning
11.1 Initial start-up
26_02_05_0087
f Before you activate the power supply, fill the appliance with
water first to avoid dry firing the heating element.
f Check for leaks.
f Activate the power supply.
f Run the tap.
f Check the function of the appliance.
11.2 Appliance handover
f Explain the appliance function to users and familiarize them
with its operation.
f Make users aware of potential dangers, especially the risk of
scalding.
f Hand over these instructions.

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COMMISSIONING
11.3 Recommissioning
!
Material losses:
Following an interruption of the water supply, recommis-
sion the appliance by carrying out the following steps in
order to prevent irreparable damage to the Advanced Direct
Coil™heating system.
f Deactivate the power supply.
f Follow the steps in section 11.1, “Initial start-up”, pg. 12.
11.4 Settings
You can alter the maximum temperature setting using the potenti-
ometer on the interior of the appliance.
DANGER: Electrocution
The temperature may only be adjusted if the appliance is
isolated from the power supply.
DANGER: Electrocution
The adjusting screw for setting the temperature is live
when the power supply is active.
26_02_05_0076_
f Remove the appliance cover.

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SHUTTING DOWN
Setting the maximum temperature
Factory setting: 100°F (38°C)
86°F / 30°C
100°F / 38°C
122°F / 50°C
D0000042035
Do not adjust the temperature unless the power supply has
been deactivated/disconnected.
f Using a flat screwdriver, set the potentiometer to the maximum
required temperature.
f Re-fit the appliance cover.
12. Shutting down
f Turn off the circuit breaker connected to the appliance.
f Drain the appliance (See , “Draining the appliance”, pg. 16).
13. Troubleshooting
Problem Cause Remedy
The appliance will not
start despite the tap
being fully open.
No power to the appliance Check the fuses/circuit
breaker.
The flow rate is too low. Increase the flow rate.
Clean aerator installed at
faucet
The filter screen in the
cold water line is blocked.
Clean the filter screen after
shutting off the cold water
inlet line.
The heater is faulty. Check the resistance of the
heating system and replace
the appliance if required.
Contact Stiebel Eltron for
additional troubleshooting
The safety pressure cutout
has activated.
Remedy the cause of the
fault. Isolate the appliance
from the power supply and
depressurize the water line.
Reset the safety pressure
cutout.

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TROUBLESHOOTING
Problem Cause Remedy
The required
temperature is not
being reached.
The maximum tempera-
ture set inside the appli-
ance is too low.
Have your qualified install-
er adjust the maximum
temperature.
The appliance is operating
beyond its output limit.
Reduce the flow rate.
If you cannot remedy the fault, notify your qualified contractor. To
facilitate and speed up your request, provide the serial number from
the type plate (000000-0000-000000).
Mini-E Nr.: 000000-0000-000000
LED indicators
26_02_05_0082_
321
1 Illuminates red in case of a fault
2 Illuminates yellow during heating operation or flashes yellow
when demand is exceeding capacity
3 Flashes green if the main control board is receiving power

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MAINTENANCE
The safety pressure cutout
D0000039769
c
1 Safety pressure cutout for Mini-E
If the safety pressure cutout is consistently tripping, there may be
an issue with the hot water supply or the appliance. Contact your
installation contractor to troubleshoot the appliance.
14. Maintenance
DANGER: Electrocution
Before any work on the appliance, disconnect the power
supply.
Draining the appliance
DANGER: Scalding
Hot water may escape during the draining process.
If the appliance needs to be drained for maintenance or to protect
the appliance when there is a risk of frost, proceed as follows:
f Close the shut-off valve in the cold water inlet line.
f Open the draw-off valve.
f Undo the water connections on the appliance.
Note:
The filter screen should be checked regularly for debris
and scale, and cleaned or replaced if necessary.
Always shut off power and water to the unit prior to
removing the filter screen.

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SPECIFICATION
Cleaning the filter screen
You can clean the filter screen after removing the cold water supply
connection.
CH
26_02_05_0065_
Checking the ground conductor
f Check the ground conductor on the appliance connection cable.
Appliance storage
f Store the dismantled appliance in a room free from the risk of
freezing, as water residues remaining inside the appliance can
freeze and cause damage.
15. Specification
15.1 Dimensions and connections
3¾˝
(95 mm)
1
1
/
8
˝
(28 mm)
1
3/16˝ (30 mm)
4¾˝ (120 mm)
5
5
/
8
˝
(143 mm)
7½˝ (190 mm)
3/16˝
(4,8 mm)
6½˝
(165 mm)
3¼˝ (82 mm)
¾˝
(20 mm)
b02
b03
c01
c06
D0000018336
Mini™-E
b02 Electric cable entry 1
b03 Electric cable entry 2
c01 Cold water inlet ⅜˝ G male*
c06 DHW outlet ⅜˝ G male*
*This is a parallel thread for connection to a ⅜ O.D. flex connector or ⅜ compression fitting

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SPECIFICATION
15.2 Wiring diagram
15.2.1 Mini-E 2-1, Mini-E 2.5-1, Mini-E 3-1 & Mini-E 3.5-1 ~
110–120 V
L N
p >
LN
-
V >
D0000035308
1
2
3
1 Safety pressure cutout
2 Flow activation switch
3 Main control board with outlet temperature sensor
15.2.2 Mini-E 4-2 and Mini-E 6-2 ~ 220–240 V
L L
p >
LL
-
V >
85_02_05_0001
1
2
3
1 Safety pressure cutout
2 Flow activation switch
3 Main control board with outlet temperature sensor

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SPECIFICATION
!
Material losses:
f In an installation with a permanent power supply,
connect the power cable according to the designations
on the socket terminals.
15.3 Temperature rise table
Temp. rise above incoming water temp. (°F) Temp. rise above incoming water temp. (°C)
GPM l/min
Unit Heating Capacity 0.32 0.42 0.48 0.53 0.69 0.85 1.06 1.14 1.2 1.6 1.8 2.0 2.6 3.2 4.0 4.3
Mini-E 2-1* 1.8 kW @110–120 V 39 ------- 22 -------
Mini-E 2.5-1 2.4 kW @110–120 V 51 39 34 30 24 19 15 14 28 22 19 17 13 11 8 8
Mini-E 3-1 3.0 kW @110–120 V 64 49 43 38 30 24 19 18 36 27 24 21 17 13 11 10
Mini-E 3.5-1 3.5 kW @110–120 V 75 57 50 45 35 28 22 21 42 32 28 25 19 16 12 12
Mini-E 4-2 2.6 kW @208 V 55 42 37 33 25 20 16 15 31 23 21 18 14 11 9 8
3.5 kW @220–240 V 75 57 50 45 35 28 22 21 42 32 28 25 19 16 12 12
Mini-E 6-2 4.3 kW @208 V --61 55 42 34 27 25 - - 34 31 23 19 15 14
5.7 kW @220–240 V --81 73 56 45 36 34 - - 45 41 31 25 20 19
*Mini-E 2-1 is internally restricted to 0.40 GPM (1.5 l/min)
Note: The output of the heating element depends on the supplied voltage. Fluctuating or varying voltages may cause the appliance to deliver hot water at different values
than the ones in the above table.

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SPECIFICATION
15.4 Data table
Mini™-E 2-1 Mini™-E 2.5-1 Mini™-E 3-1 Mini™-E 3.5-1 Mini™-E 4-2 Mini™-E 6-2
236011 236135 236010 236136 236009 236008
Electrical data
Phase 1 - 50/60 Hz
Voltage1110–120 V 110–120 V 110–120 V 110–120 V 220–240 V 208 V 220–240 V 208 V
Wattage 1.8 kW 2.4 kW 3.0 kW 3.5 kW 3.5 kW 2.6 kW 5.7 kW 4.3 kW
Amperage draw 15 A 20 A 25 A 29 A 15 A 13 A 24 A 21 A
Min. recommended circuit breaker size215 A 20 A 25 A 30 A 15 A 25 A
Min. recommended wire size3(copper) 14 AWG 12 AWG 10 AWG 10 AWG 14 AWG 10 AWG
Connections
Water connection ⅜ O.D. flex connector or ⅜ compression fitting
Application limits
Max. permissible pressure 150 psi (10 bar)
Max. inlet temperature for reheating 122°F (50 °C)
Temperature & Flow Values
Max. permissible inlet temperature 140°F (60°C)
Temperature setting range, DHW 86–122°F (30–50°C)
Minimum water flow to activate unit 0.21 gpm (0.8 l/min)0.3 gpm (1.15 l/min)0.3 gpm (1.15 l/min)0.3 gpm (1.15 l/min)0.3 gpm (1.15 l/min)0.47 gpm (1.8 l/min)
Pressure drop at activation flow rate 7.2 psi (0.5 bar)7.2 psi (0.5 bar)7.2 psi (0.5 bar)7.2 psi (0.5 bar)8.7 psi (0.6 bar) 10.2 psi (0.7 bar)
*Mini-E 2-1 is internally restricted to 0.4 gpm (1.5 l/min).
1Nominal mains voltage is 110–120 V and 220–240 V.
2This is our recommendation for over-current protection sized at 100% of load. Check local codes for compliance if necessary. Tankless water heaters are considered a
non-continuous load.
3AWG copper must be used. Conductors should be sized to maintain a voltage drop of less than 3% under load.