STIEBEL ELTRON MINI 2 Specification sheet

OPERATING AND INSTALLATION MANUAL
TANKLESS ELECTRIC WATER HEATER WITH ELECTRO-MECHANICAL FLOW SWITCH
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270578-36287-8650
STIEBEL ELTRON Inc.
17 West Street | West Hatfield, MA 01088
Tel. [phone] | Fax [phone]
Email [e-mail]
www.stiebel-eltron-usa.com
The Mini™ series is
tested and certified
by WQA against NSF/
ANSI 372 for “lead free“
compliance.

2 | MINI™ SERIES TANKLESS ELECTRIC WATER HEATERS WWW.STIEBEL-ELTRON-USA.COM
CONTENTS | OPERATION
1. General Information _____________________________ 3
1.1 Symbol key ______________________________________ 3
2. Safety precautions ______________________________ 4
3. Register your product ___________________________ 4
4. Temperature increase above ambient water
temperature______________________________________ 4
5. Technical drawings______________________________ 4
6. Overview_________________________________________ 7
6.1 Figure legend ___________________________________ 7
6.2 General description ____________________________ 7
6.3 Important information before supplying
power to unit ___________________________________ 7
6.4 Hot water output _______________________________ 8
6.5 Incorrect use ____________________________________ 8
6.6 First steps to be taken in the event of
malfunction _____________________________________ 8
6.7 Maintenance and care _________________________ 8
7. Operating and installation instructions ________ 9
7.1 Mounting the unit ______________________________ 9
7.2 Plumbing connections _________________________ 9
7.3 Electrical connection___________________________ 9
8. Initial start-up __________________________________ 10
9. Water heater hand over________________________ 10
10. Normal maintenance ___________________________ 10
11. Technical data __________________________________ 11
12. Troubleshooting ________________________________ 11
13. Spare parts _____________________________________ 12
14. Warranty ________________________________________ 12

ENGLISH
WWW.STIEBEL-ELTRON-USA.COM MINI™ SERIES TANKLESS ELECTRIC WATER HEATERS | 3
GENERAL INFORMATION
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.
OPERATION
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")
2 Keyword (see 1.1.3 "Keywords")
3 Designations (see 1.1.2 "Symbols")
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.

4 | MINI™ SERIES TANKLESS ELECTRIC WATER HEATERS WWW.STIEBEL-ELTRON-USA.COM
GENERAL INFORMATION
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 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 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 (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
"Warranty", SECTION 14 PG. 12). 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.

ENGLISH
WWW.STIEBEL-ELTRON-USA.COM MINI™ SERIES TANKLESS ELECTRIC WATER HEATERS | 5
GENERAL INFORMATION
TEMPERATURE INCREASE ABOVE AMBIENT WATER TEMPERATURE
1.2 1.6 1.8 2.0 2.6 3.2 4.0 4.3
Mini™ 4 3.5 42 31 28 25 19 – – –
Mini™ 4 3.5 75 56 50 45 35 – – –
[ °F ]
Type kW l/min
[ °C ]
Min. water flow to activate unit.
Min. water flow to activate unit.
Mini™ 3 3.0 65 49 43 41 30 – – –
Mini™ 2 1.8 38 - - - – – – –
Type kW GPM
0.32 0.42 0.48 0.5 0.69 0.85 1.06 1.14
Mini™ 3 3.0 36 27 24 22 17 – – –
Mini™ 2 1.8 22 16 14 13 – – – –
Mini™ 6 5.7 – – – – – 46 37 34
Mini™ 6 5.7 – – – – – 26 20 19
5 /
58
” (143 mm)
3
/
16
” (4,8 mm)
13/16 ” (20 mm)
1/
316 ” (30 mm)
4¾” (120 mm)
6 ½ ” (165 mm)
7½”(190 mm) 3¼”(82 mm)
9/16”-24 UNEF
3 ¾ ” (95 mm)
C26_02_05_0009
12
4
3
A
4. Temperature increase above ambient water temperature
5. Technical drawings

6 | MINI™ SERIES TANKLESS ELECTRIC WATER HEATERS WWW.STIEBEL-ELTRON-USA.COM
GENERAL INFORMATION
TECHNICAL DRAWINGS
C26_02_05_0010
V >
p>
L N
L N GRDMini™ 2/3
L L GRDMini™ 4/6
5
6
7
8
9
10
CB
D

OPERATION
OVERVIEW
ENGLISH
WWW.STIEBEL-ELTRON-USA.COM MINI™ SERIES TANKLESS ELECTRIC WATER HEATERS | 7
6. Overview
6.1 Figure legend
1 Hot water connection
2 Cold water connection with filter screen
3 Filter screen
4 Mounting holes
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
6.2 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,
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.
IF YOU HAVE ANY QUESTIONS REGARDING THE INSTALLATION OR OPERATION OF THIS WATER HEATER, OR
IF YOU NEED ANY ADDITIONAL 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.
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.

OPERATION
OVERVIEW
8 | MINI™ SERIES TANKLESS ELECTRIC WATER HEATERS WWW.STIEBEL-ELTRON-USA.COM
6.3 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.
6.4 Hot water output
Model Wattage Typical hot water
output
Mini™ 2* 1.8 kW 0.32 GPM
Mini™ 3 3.0 kW 0.5 GPM
Mini™ 4 3.8 kW 0.5 GPM
Mini™ 6 6.2 kW 1.0 GPM
*Note: Mini™ 2 is internally restricted to 0.32 GPM
6.5 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 "Initial
startup", section 8, pg. 10)
- Operation of the unit with the cover off
- Heating liquids other than potable water
6.6 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 also ”Troubleshooting” section
10 pg. 11.
6.7 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.

ENGLISH
WWW.STIEBEL-ELTRON-USA.COM MINI™ SERIES TANKLESS ELECTRIC WATER HEATERS | 9
INSTALLATION
OPERATING AND INSTALLATION INSTRUCTIONS
7. Operating and 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 NATION-
AL 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“ OD Tube
Outlet.
»8. When all plumbing work is completed, check for
leaks and take corrective action before proceeding.
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 OR MINI™ 3 ON
A 208V OR 220 - 240V CIRCUIT WILL DESTROY THE
HEATING ELEMENT. THIS IS CONSIDERED IMPROPER
INSTALLATION AND WILL VOID YOUR FACTORY
WARRANTY.
Voltage
Mini™ 2: 110 - 120V
Mini™ 3: 110 - 120V
Mini™ 4: 208, 220 - 240V
Mini™ 6: 208, 220 - 240V

10 | MINI™ SERIES TANKLESS ELECTRIC WATER HEATERS WWW.STIEBEL-ELTRON-USA.COM
INSTALLATION
INITIAL START-UP
7.3 Electrical connection (cont.)
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.