STIEBEL ELTRON MINI 2-1 Instruction Manual

OPERATION AND INSTALLATION
FUNCIONAMIENTO E INSTALACIÓN
MODE D’EMPLOI ET INSTALLATION
TANKLESS ELECTRIC WATER HEATER WITH ELECTROMECHANICAL FLOW SWITCH
CALENTADOR ELÉCTRICO DE AGUA SIN TANQUE CON SENSOR ELECTROMECÁNICO DE FLUJO
CHAUFFE-EAU ÉLECTRIQUE SANS RÉSERVOIR AVEC CONTACTEUR DEBITMETRIQUE
ÉLECTROMÉCANIQUE
» MINI™2-1
» MINI™2.5-1
» MINI™3-1
» MINI™3.5-1
» MINI™4-2
» MINI™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.

2 | MINI™SERIES TANKLESS ELECTRIC WATER HEATERS WWW.STIEBEL-ELTRON-USA.COM
CONTENTS | OPERATION
GENERAL INFORMATION
1. General Information
Read this entire manual. Failure to follow all the guides, instructions
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 responsibility of the
installer. Failure to comply with the installation and operating
instructions or improper use voids the warranty.
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 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 MESSAGES THAT FOLLOW THIS SYMBOL TO AVOID
POSSIBLE INJURY OR DEATH.
The chapter Operation is intended for homeowners, heating
contractors, plumbers and electricians.
The chapter Installation is intended for heating contractors,
plumbers and electricians only.
1.1 Symbol key
1.1.1 Layout of safety information
DANGER Electric shock Before any work on the appliance,
disconnect all poles from the power
supply.
13
4
2
1 Symbol (see 1.1.2 “Symbols”, below)
2 Keyword (see 1.1.3 “Keywords”, below)
3 Description (see 1.1.2 “Symbols”, below)
4 Information text
1.1.2 Symbols
Symbol Description
Injury
Electrocution
Burns or scalding
!
Other situations
1.1.3 Keywords
KEYWORD
DANGER The keyword DANGER indicates information that
must be observed, otherwise serious injury or
death will result.
WARNING The keyword WARNING indicates information that
must be observed, otherwise serious injury or
death may result.
CAUTION The keyword CAUTION indicates information that
must be observed, otherwise relatively serious or
light injuries may result.
1. General Information __________________________________________ 2
1.1 Symbol key����������������������������������������������������������� 2
2. Safety precautions____________________________________________ 3
3. Register your product ________________________________________ 3
4. Temperature increase above ambient water temperature 4
5. Technical drawings ___________________________________________ 4
6. Overview ______________________________________________________ 6
6.1 General Description ������������������������������������������������ 6
6.2 Important information before supplying power to unit����� 6
6.3 Hot water output���������������������������������������������������� 6
6.4 Incorrect use��������������������������������������������������������� 7
6.5 First steps to be taken in the event of malfunction ���������� 7
6.6 Maintenance and care ��������������������������������������������� 7
7. Installation instructions ______________________________________ 7
7.1 Mounting the unit �������������������������������������������������� 7
7.2 Plumbing connections ��������������������������������������������� 7
7.3 Electrical connection����������������������������������������������� 8
8. Initial start-up ________________________________________________ 8
9. Water heater hand over ______________________________________ 8
10. Normal maintenance _________________________________________ 8
11. Technical data_________________________________________________ 9
12. Troubleshooting_______________________________________________ 9
13. Spare parts___________________________________________________10
14. Warranty _____________________________________________________11

ENGLISH
WWW.STIEBEL-ELTRON-USA.COM MINI™SERIES TANKLESS ELECTRIC WATER HEATERS |3
GENERAL INFORMATION | OPERATION
SAFETY PRECAUTIONS
2. Safety precautions
!
PLEASE READ AND FOLLOW THESE INSTRUCTIONS. FAILURE TO FOLLOW THESE INSTRUCTIONS COULD
RESULT IN SERIOUS BODILY INJURY OR DEATH.
THE UNIT MUST BE INSTALLED BY A LICENSED ELECTRICIAN
AND PLUMBER. THE INSTALLATION MUST COMPLY WITH ALL
NATIONAL, STATE AND LOCAL PLUMBING AND ELECTRIC CODES.
SERVICE OF THE UNIT MUST BE PERFORMED BY QUALIFIED
SERVICE TECHNICIANS.
BEFORE PROCEEDING WITH ANY INSTALLATION, ADJUSTMENT, ALTERATION, OR SERVICE OF THIS UNIT
ALL CIRCUIT BREAKERS AND DISCONNECT SWITCHES SERVICING
THE UNIT MUST BE TURNED OFF. FAILURE TO DO SO COULD
RESULT IN SERIOUS PERSONAL INJURY OR DEATH.
DANGER: NEVER REMOVE THE UNIT'S COVER UNLESS THE ELECTRICITY SERVICING THE UNIT IS TURNED OFF.
FAILURE TO DO SO COULD RESULT IN PERSONAL INJURY OR
DEATH.
WARNING: THE UNIT MUST BE PROPERLY GROUNDED. FAILURE TO ELECTRICALLY GROUND THE PRODUCT
COULD RESULT IN SERIOUS PERSONAL INJURY OR DEATH.
DANGER: 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 UNIT IS SET TOO HIGH. HOUSEHOLDS
WITH SMALL CHILDREN, DISABLED OR ELDERLY PERSONS MAY
REQUIRE THAT THE THERMOSTAT BE SET AT 120°F (49°C) OR
LOWER TO PREVENT POSSIBLE INJURY FROM HOT WATER.
3. Register your product
YOU MUST REGISTER THIS PRODUCT WITHIN 90 DAYS OF PURCHASE ON OUR WEB SITE IN ORDER TO ACTIVATE THE
STANDARD WARRANTY OR TO BE ELIGIBLE FOR THE EXTENDED
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: Mini 3-1 (from the white label that is on the right
side of the unit)
Number listed after "Nr."
Place of Purchase
Purchase Date
First & Last Name
Email address
Physical Address
Phone Number
IF YOU HAVE ANY QUESTIONS CONCERNING THE REGISTRATION
PROCESS OR WARRANTY OPTIONS, PLEASE CONTACT STIEBEL
ELTRON USA DIRECTLY AT (800)-582-8423.
Limited liability warranty:
Stiebel Eltron, Inc. is not liable for damages to the unit, damage to
personal property, bodily injury, or loss of life due to the following
conditions:
- Non-observance of these instructions
- Incorrect use (heating any other liquid than water)
- Installation of the appliance by unqualified personnel
- Unauthorized modifications
- Technical modifications
- Use of unauthorized spare parts
THE THREE YEAR WARRANTY COVERS ALL PARTS BUT DOES NOT
COVER DAMAGE TO THE UNIT DUE TO HARD WATER (FOR THE
COMPLETE WARRANTY SEE SECTION 14, “WARRANTY”, PG. 11).
IF YOU KNOW OR SUSPECT THAT THE WATER IN YOUR AREA IS
HARD (HAS A HIGH MINERAL CONTENT), IT IS NECESSARY TO
INSTALL A WATER SOFTENING DEVICE TO AVOID DAMAGE TO THE
MINI™UNIT.

4 | MINI™SERIES TANKLESS ELECTRIC WATER HEATERS WWW.STIEBEL-ELTRON-USA.COM
GENERAL INFORMATION | OPERATION
TEMPERATURE INCREASE ABOVE AMBIENT WATER TEMPERATURE
Mini 4-2 3.5 – 57 50 45 35 – – –
Mini 3.5-1 3.5 – 57 50 45 35 – – –
[ °F ]
Min. water flow to activate unit.
Mini 3-1 3.0 – 49 43 41 30 – – –
Mini 2-1
*
1.8 39 – – – – – – –
Type kW GPM
0.32 0.42 0.48 0.5 0.69 0.85 1.06 1.14
Mini 6-2 5.7 – – – – – 46 37 34
Mini 2.5-1 2.4 – 39 34 33 24 – – –
5 /
58
” (143 mm)
3
/
16
” (4,8 mm)
13/16 ” (20 mm)
1/
316 ” (30 mm)
4¾” (120 mm)
6½” (165 mm)
7½” (190 mm) 3¼” (82 mm)
3/8” O.D.
flex connector
3 ¾ ” (95 mm)
C26�02�05�0009
12
4
3
A
4. Temperature increase above ambient water temperature
5. Technical drawings
1.2 1.6 1.8 2.0 2.6 3.2 4.0 4.3
Type kW l/min
[ °C ]
Min. water flow to activate unit.
Mini 3-1 3.0 – 27 24 22 17 – – –
Mini 3.5-1 3.5 – 31 28 25 19 – – –
Mini 2-1
*
1.8 22 – – – – – – –
Mini 2.5-1 2.4 – 22 19 17 13 – – –
Mini 4-2 3.5 – 31 28 25 19 – – –
Mini 6-2 5.7 – – – – – 26 20 19
* Note: Mini 2-1 is internally restricted to 1.2 l/min (0.32 gpm)
* Note: Mini 2-1 is internally restricted to 0.32 gpm (1.2 l/min)
Figure A legend
1 Hot water connection
2 Cold water connection with filter screen
3 Filter screen
4 Mounting holes

ENGLISH
WWW.STIEBEL-ELTRON-USA.COM MINI™SERIES TANKLESS ELECTRIC WATER HEATERS |5
GENERAL INFORMATION | OPERATION
TECHNICAL DRAWINGS
C26�02�05�0010
V >
p>
L N
L N GRD
Mini™2-1/2.5-1
3-1/3.5-1
L L GRDMini™4-2/6-2
5
6
7
8
9
10
CB
D
Figure C legend
5 Electrical junction box
6 Water supply line for faucet installation
7 Sink
8 Cold valve (right)
9 Hot valve (left)
10 Shut off valve
11 Reset button from safety pressure cut out

OPERATION
OVERVIEW
6 | MINI™SERIES TANKLESS ELECTRIC WATER HEATERS WWW.STIEBEL-ELTRON-USA.COM
6. Overview
6.1 General Description
The Mini™tankless water heater differs from conventional storage
type water heaters in several ways. It does not store hot water.
Instead, water is heated instantaneously as it flows through the
unit. The powerful heating elements are activated by a flow
switch as water is drawn from a hot water faucet connected to
the Mini™. Due to the absence of stand-by losses, the Mini™offers
greater energy efficiency than storage type water heaters. The
unit will continuously supply hot water as long as the faucet is
open.
The temperature of the hot water delivered by the Mini™depends
on the wattage of the heating element, the temperature of the
incoming cold water, and the water flow rate through the unit.
In order for the Mini™to operate properly, it must be carefully
matched to the application.
In case you have questions regarding the way you plan to use the
Mini™, please call our technical service line at 800-582-8423 (USA
and Canada). For service outside the U.S. and Canada, please call
us at USA 413-247-3380. You can also e-mail us at info@stiebel-
eltron-usa.com or fax us at 413-247-3369.
The Mini™can be used for hand washing type applications in the
U.S. and Canada:
– Restroom sinks in commercial/industrial facilities and homes
– Kitchen areas in commercial /industrial facilities and homes
– Cabins
– Special uses in photo developing shops, laboratories etc.
The Mini™can also be used for whole apartments and
homes in warm climate zones such as the Caribbean region,
Central America and Mexico due to the higher ambient water
temperatures.
THIS MANUAL MUST BE READ CAREFULLY BEFORE ATTEMPTING TO INSTALL THE MINI™WATER HEATER. IF YOU DO NOT FOLLOW
THE SAFETY RULES OR THE INSTRUCTIONS OUTLINED IN THIS MANUAL, THE UNIT MAY NOT OPERATE PROPERLY AND IT COULD
CAUSE PROPERTY DAMAGE, SERIOUS BODILY INJURY AND/OR DEATH.
STIEBEL ELTRON, INC. WILL NOT BE LIABLE FOR ANY DAMAGES BECAUSE OF FAILURE TO COMPLY WITH THE INSTALLATION AND
OPERATING INSTRUCTIONS OUTLINED IN THIS MANUAL OR BECAUSE OF IMPROPER USE. IMPROPER USE INCLUDES THE USE OF THIS
APPLIANCE TO HEAT ANY LIQUID OTHER THAN WATER. FAILURE TO COMPLY WITH THE INSTALLATION AND OPERATING INSTRUCTIONS
OR IMPROPER USE VOIDS WARRANTY. NEVER REMOVE THE UNIT’S COVER UNLESS THE ELECTRICITY IS TURNED OFF.
IFYOU HAVE ANYQUESTIONS REGARDINGTHE INSTALLATION OR OPERATION OF THIS WATER HEATER, OR IF YOU NEED ANYADDITIONAL
INSTALLATION MANUALS, PLEASE CALL OUR TECHNICAL SERVICE LINE ON 800-582-8423 (USA AND CANADA ONLY). IF YOU ARE CALLING
FROM OUTSIDE THE U.S. OR CANADA, PLEASE CALL USA 413-247-3380 AND WE WILL REFER YOU TO A QUALIFIED STIEBEL ELTRON
SERVICE REPRESENTATIVE IN YOUR AREA.
6.2 Important information before supplying power
to unit
Air in the cold water pipe will destroy the bare-wire heating system of the Mini™. If the water supply to the
Mini™has been interrupted, for example due to the risk of frost
or work on the water pipe, the following steps must be carried
out before the unit is used again.
»1. Turn off circuit breaker.
»2. Open a hot water tap downstream of the unit for as long as
is necessary for the unit and the cold water pipe to be free of
air.
»3. Turn on circuit breaker.
All information in these Instructions for Use and Installation
must be followed carefully. They provide important information
with regard to safety, operation, installation, and maintenance
of the device.
6.3 Hot water output
Model Wattage at
max rated
voltage
Typical hot water
output
Mini™2-1 1.8 kW 0.32 gpm / 1.2 l/min
Mini™2.5-1 2.4 kW 0.50 gpm / 1.9 l/min
Mini™3-1 3.0 kW 0.50 gpm / 1.9 l/min
Mini™3.5-1 3.5 kW 0.66 gpm / 2.5 l/min
Mini™4-2 3.5 kW 0.66 gpm / 2.5 l/min
Mini™6-2 5.7 kW 1.00 gpm / 3.8 l/min
Mini™2-1 models are internally restricted to 0.32 gpm (1.2 l/min).
Mini™2-1, 2.5-1, 3-1 ship with a 0.5 gpm (1.9 l/min) pressure
compensating flow reducer/aerator that must be installed. Mini™
3.5-1, 4-2 ship with a 0.66 gpm (2.5 l/min) pressure compensating
flow reducer/aerator that must be installed.

ENGLISH
WWW.STIEBEL-ELTRON-USA.COM MINI™SERIES TANKLESS ELECTRIC WATER HEATERS |7
INSTALLATION
INSTALLATION INSTRUCTIONS
6.4 Incorrect use
The following are not permitted and will void the factory warranty:
- Installation of the appliance where it is at risk
from frost
- Installation in rooms where the appliance is at risk from
explosions as a result of dust, gases or vapors
- Ignoring safety clearances and safety zones
- Incorrect power connection
- Operation of the appliance without water flowing through the
unit, or with air in the lines (See section 8, “Initial start-up”,
pg. 8)
- Operation of the unit with the cover off
- Heating liquids other than potable water
6.5 First steps to be taken in the event of
malfunction
WARNING: ALWAYS SHUT OFF POWER AND WATER TO THE UNIT PRIOR TO REMOVING THE FILTER SCREEN.
FAILURE TO DO SO MAY CAUSE SERIOUS BODILY INJURY OR
DEATH.
»Check the circuit breaker
»Check the filter screen for scale blockage or dirt accumulation.
See section 12, “Troubleshooting”, pg. 9.
6.6 Maintenance and care
!
MAINTENANCE WORK, SUCH AS CHECKING ELECTRICAL SAFETY, MAY ONLY BE CARRIED OUT BY A QUALIFIED
INSTALLER.
WARNING: ALWAYS SHUT OFF POWER AND WATER TO THE UNIT PRIOR TO REMOVING THE FILTER SCREEN.
FAILURE TO DO SO MAY CAUSE SERIOUS BODILY INJURY OR
DEATH.
Regularly clean and descale the filter screen located in the cold water
inlet connection and if necessary replace. Always shut off power and
water to the unit prior to removing the filter screen.
A damp cloth is sufficient for cleaning of the unit's housing. Do not
use any abrasive or corrosive cleaning agents.
7. Installation instructions
KEEP THESE INSTRUCTIONS CAREFULLY AND PASS THEM ON TO YOUR SUCCESSOR IN THE EVENT OF A CHANGE
IN OWNERSHIP, IN THE EVENT OF MAINTENANCE AND POSSIBLE
REPAIR WORK THEY SHOULD BE PASSED TO THE QUALIFIED
INSTALLER FOR HIS OR HER REFERENCE.
7.1 Mounting the unit
!
UNIT MUST BE INSTALLED WITH THE PLUMBING CONNECTIONS POINTING DOWNWARD OR UPWARD ONLY.
WARNING: DO NOT INSTALL UNIT WHERE IT WOULD ROUTINELY BE SPLASHED WITH WATER. ELECTRIC SHOCK
OR DEATH MAY RESULT.
»1. Install Mini™as close as possible to the hot water draw-off
point, for example, directly underneath the sink or next to the
shower stall.
»2. Install Mini™in a frost free area. If frost may occur, remove
unit before freezing temperatures set in.
»3. Leave a minimum of 5" of clearance on all sides for
servicing.
»4. Remove plastic cover by removing screws located on the left
and right sides of the unit B.
»5. Remove plastic backplate by pulling on the tab with a
screwdriver B.
»6. Mount backplate securely to wall by putting two screws
through mounting holes A B .
»7. Snap unit back onto mounting plate B.
»8. Reinstall cover with screws on left and right side of unit B.
7.2 Plumbing connections
NOTE: IF SOLDERING NEAR THE UNIT IS NECESSARY, PLEASE DIRECT THE FLAME AWAY FROM THE HOUSING OF THE UNIT
IN ORDER TO AVOID DAMAGE. EXCESSIVE HEAT FROM SOLDERING
ON COP PER PIPES NEAR THE MINI™MAY CAUSE DAMAGE.
ALL PLUMBING WORK MUST COMPLY WITH NATIONAL AND
APPLICABLE STATE AND LOCAL PLUMBING CODES.
»1. All plumbing work must comply with national and
applicable state and local plumbing codes.
»2. A pressure reducing valve must be installed if the cold water
supply pressure exceeds 150 PSI (10 bar).
»3. Make certain that the cold water supply line has been
flushed to remove any scale and dirt.
»4. Install isolating valve in cold water line as shown in
illustration C. This allows the unit to be isolated for
maintenance purposes.
»5. Cold water connection (inlet) is on the right side of the unit,
hot water connection (outlet) is on the left side of unit.
»6. Tankless water heaters such as the Mini™are not required
to be equipped with a Pressure and Temperature Relief Valve
(except in Massachusetts). If the local inspector will not pass
the installation without a P+T valve, it should be installed on
the hot water outlet side of unit.
»7. The Mini™is designed for connection to a braided stainless
steel hose with a 3/8˝ O.D. Tube Outlet.
»8. When all plumbing work is completed, check for leaks and
take corrective action before proceeding.

8 | MINI™SERIES TANKLESS ELECTRIC WATER HEATERS WWW.STIEBEL-ELTRON-USA.COM
INSTALLATION
INITIAL START-UP
7.3 Electrical connection
WARNING: BEFORE BEGINNING ANY WORK ON THE ELECTRIC INSTALLATION, BE SURE THAT THE MAIN CIRCUIT
BREAKER PANEL SWITCH IS “OFF” TO AVOID ANY DANGER OF
ELECTRIC SHOCK. FAILURE TO DO SO MAY RESULT IN SERIOUS
INJURY OR DEATH. ALL MOUNTING AND PLUMBING MUST BE
COMPLETED BEFORE PROCEEDING WITH ELECTRICAL HOOK-UP.
WHERE REQUIRED BY LOCAL, STATE OR NATIONAL ELECTRICAL
CODES, THE CIRCUIT SHOULD BE EQUIPPED WITH A GROUND FAULT
INTERRUPTER.
WARNING: AS WITH ANY ELECTRIC APPLIANCE, FAILURE TO
ELECTRICALLY GROUND UNIT MAY RESULT IN SERIOUS INJURY OR
DEATH.
CAUTION: INSTALLING A MINI™2-1, MINI™2.5-1, MINI™3-1, OR
MINI™3.5-1 ON A 208 V OR 220–240 V CIRCUIT WILL DESTROY
THE HEATING ELEMENT. THIS IS CONSIDERED IMPROPER
INSTALLATION AND WILL VOID YOUR FACTORY WARRANTY.
Voltage
Mini™2-1: 110–120 V
Mini™2.5-1: 110–120 V
Mini™3-1: 110–120 V
Mini™3.5-1: 110–120 V
Mini™4-2: 220–240, 208 V
Mini™6-2: 220–240, 208 V
1. All electrical work must comply with national and applicable state
and local electrical codes.
2. The Mini™should be connected to a properly grounded dedicated
branch circuit of proper voltage rating. In installations with several
Mini™units, each unit requires an independent circuit. Please refer to
the technical data table for the correct wire and circuit breaker size.
3. The open ends of the “pigtail” must be feed into an electrical
junction box. Then feed wires through strain relief clamp and tighten
clamp down on wire.
4. Reinstall plastic cover.
8. Initial start-up
!
WARNING: OPEN HOT WATER FAUCET FOR A FEW MINUTES UNTIL WATER FLOW IS CONTINUOUS AND ALL AIR IS
PURGED FROM WATER PIPES. THE UNIT’S PLASTIC COVER MUST
BE INSTALLED BEFORE THE CIRCUIT BREAKER IS TURNED ON.
26�02�02�0436
2
1
press
on
on
electronic
°C
2.
electronic
°C
electronic
°C
1.
electronic
°C
X1
press
on
on
electronic
°C
2.
electronic
°C
electronic
°C
1.
electronic
°C
X1
9. Water heater hand over
Explain the functions of the unit to the user and familiarize him or
her with its use.
Important instructions:
»Draw the user’s attention to possible hazards (scalding).
»Hand over these instructions for future reference.
»In order to obtain a proper temperature at a single spout
mixer-type faucet, restrict cold water flow to faucet by partially
closing the cold water shut-off valve under the sink until cold
water and hot water flow rates are approximately the same.
10. Normal maintenance
!
CAUTION: OTHER THAN THE FILTER SCREEN, THE MINI™ DOES NOT CONTAIN ANY PARTS SERVICEABLE BY THE LAY
PERSON. IN CASE OF MALFUNCTION PLEASE CONTACT A LICENSED
PLUMBER OR ELECTRICIAN.
Stiebel Eltron Mini™tankless heaters are designed for a very long
service life. Actual life expectancy will vary with water quality and
use. The unit itself does not require any regular maintenance.
However, to ensure consistent water flow, it is recommended to
periodically remove scale and dirt that may build up at the aerator
of the faucet or in the shower head. Also, the Mini™has a built in
filter screen that should be cleaned from time to time. In order to
do this, turn off the cold water supply at the isolating valve. Clean
screen and put the screen back into its original position.

ENGLISH
WWW.STIEBEL-ELTRON-USA.COM MINI™SERIES TANKLESS ELECTRIC WATER HEATERS |9
INSTALLATION
TECHNICAL DATA
11. Technical data
Mini™ 2-1 Mini™2.5-1 Mini™3-1 Mini™3.5-1 Mini™4-2 Mini™6-2
Item number 231045 232098 220816 232099 222039 220817
Phase 11111 1
Voltage 110–120 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
Max. amp, load 15 A 20 A 25 A 29 A 14.6 A 12.7 A 23.8 A 20.6 A
Min. recommended
circuit breaker size1
15 A 20 A 25 A 30 A 15 A 15 A 25 A 25 A
Min. recommended
wire size2(copper)
14 Awg 12 Awg 10 Awg 10 Awg 14 Awg 14 Awg 10 Awg 10 Awg
Minimum water flow
to activate unit
0.21 gpm
(0.8) l/min
0.40 gpm
(1.5) l/min
0.40 gpm
(1.5) l/min
0.40 gpm
(1.5) l/min
0.40 gpm
(1.5) l/min
0.77 gpm
(2.9) l/min
Recommended inlet
temp. range 41–77 °F (5–25 °C)
Nominal water volume 0.026 gal (0.1 l)
Max. working pressure 150 psi (10 bar)
Tested to pressure 300 psi (20 bar)
Weight 3.44 lbs. (1.56 kg)
Height
Depth
Width
6½˝ (165 mm)
3¼˝(82 mm)
7½˝ (190 mm)
Water connections3for 3/8˝ O.D. flex connector
Heating system Nichrome bare-wire
Mini™2-1 models are internally restricted to 0.32 gpm (1.2 l/min).
Mini™2-1, 2.5-1, 3-1 ship with a 0.5 gpm (1.9 l/min) pressure compensating flow reducer/aerator that must be installed.
Mini™3.5-1, 4-2 ship with a 0.66 gpm (2.5 l/min) pressure compensating flow reducer/aerator that must be installed.
1This is our recommendation for overcurrent protection sized at 100% of load. Check local codes for compliance if necessary.
Tankless water heater are considered a non-continuous load.
2Copper must be used. Conductors should be sized to maintain a voltage drop of less than 3% under load
3For use with cold water supply only
12. Troubleshooting
ESymptom Possible cause Solution
No hot water
despite fully
opened hot
water faucet.
No electrical power. Check the circuit breaker and
check voltage at the wiring block.
The activation flow rate needed to
turn on the heating element has
not been reached.
Clean filter screen.
Safety cut out tripped – turn circuit breakers off
– open Hot Valve to release pres-
sure from the unit
– reset safety pressure cut out E
– turn circuit breakers on
Safety pressure
cut out

10 | MINI™SERIES TANKLESS ELECTRIC WATER HEATERS WWW.STIEBEL-ELTRON-USA.COM
INSTALLATION
SPARE PARTS
1
2Rear housing
3Filter screen
4Plumbing connection (incl. 2 O-rings)
Mini™ Tankless Spare Parts List & Diagram
Spare Part No.ModelMini™ 2-1, 2.5-1, 3-1, 3.5-1, 4-2, 6-2
271010
271011
275981
272777
1
23
4
Front cover
13. Spare parts
Spare Part (all Mini™ models) Item no.
1 Front cover 271010
2 Rear housing 271011
3 Filter screen 272884
4 Plumbing connections 272777
5 O-rings (not shown) 083043