STIEBEL ELTRON DHE?18 SLi 25 A User manual

GEBRAUCHS- UND MONTAGEANLEITUNG
OPERATING AND INSTALLATION INSTRUCTIONS
INSTRUCTIONS D‘UTILISATION ET DE MONTAGE
GEBRUIKS- EN MONTAGEAANWIJZING


ИнструкцИя за експлоатацИя И монтаж
ИнструкцИя по монтажу И эксплуатацИИ
Vollelektronisch geregelter durchlauferhitzer | Instantaneous water heater with full
electronic control | Chauffe-eau instantané à régulation entièrement électronique |
Volledig elektronisch geregelde elektrische doorstromer | Caikowicie elektronicznie

 | Изцяло електронно регулиран проточен бойлер | Проточный водонагреватель с
электронным управлением
» DHE 18 SLi 25 A
» DHE 18/21/24 SLi
» DHE 27 SLi
299680_DHE_18-27_SLi_de_en_fr_nl_pl_cs_bg_ru.indb 1 05.03.2013 08:37:25

22 |DHE SLi www.stiebel-eltron.com

General information
OPERATION
1. General information ��������������������������������������� 22
1.1 Safety instructions���������������������������������������������� 22
1.2 Other symbols in this documentation ���������������������� 23
1.3 Units of measurement ����������������������������������������� 23
2. Safety�������������������������������������������������������� 23
2.1 Intended use����������������������������������������������������� 23
2.2 General safety instructions ����������������������������������� 23
2.3 CE designation �������������������������������������������������� 23
2.4 Test symbols ����������������������������������������������������� 23
3. Appliance description ������������������������������������� 24
4. Settings and displays �������������������������������������� 24
4.1 User interface on the appliance������������������������������24
4.2 Temperature setting ������������������������������������������� 25
4.3 Economy monitor selection����������������������������������� 25
4.4 Appliance settings ��������������������������������������������� 26
5. Cleaning, care and maintenance ������������������������� 27
6. Troubleshooting �������������������������������������������� 27
7. Safety�������������������������������������������������������� 28
7.1 General safety instructions ����������������������������������� 28
7.2 Instructions, standards and regulations ������������������� 28
8. Appliance description ������������������������������������� 28
8.1 Standard delivery����������������������������������������������� 28
8.2 Accessories������������������������������������������������������� 28
9. Preparations������������������������������������������������ 29
9.1 Installation site�������������������������������������������������� 29
9.2 Factory settings ������������������������������������������������� 29
10. Installation�������������������������������������������������� 30
10.1 Completing the installation����������������������������������� 32
10.2 Alternative installation methods�����������������������������32
11. Commissioning ��������������������������������������������� 35
11.1 Commissioning�������������������������������������������������� 35
11.2 Recommissioning����������������������������������������������� 35
12. Service mode ����������������������������������������������� 35
13. Shutting down���������������������������������������������� 36
14. Troubleshooting �������������������������������������������� 36
15. Maintenance ������������������������������������������������ 38
16. Specification ������������������������������������������������ 38
16.1 Dimensions and connections��������������������������������� 38
16.2 Wiring diagram �������������������������������������������������38
16.3 Mixed water volume/ outlet volume ����������������������� 39
16.4 Application areas ����������������������������������������������� 39
16.5 Pressure drop ��������������������������������������������������� 39
16.6 Fault conditions ������������������������������������������������� 39
16.7 Data table �������������������������������������������������������� 40
GUARANTEE
ENVIRONMENT AND RECYCLING
OPERATION
1. General information
The chapter "Operation" is intended for appliance users and qual-
ified contractors.
The chapter "Installation" is intended for qualified contractors.
Note Read these instructions carefully before using the appli-
ance and retain them for future reference.
Pass on the instructions to a new user if required.
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.
 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
 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-seri-
ous or minor injury.
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OPERATION
Safety
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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.
 Read these texts carefully.
Symbol
!Material damage
(appliance, consequential and environmental damage)
Appliance disposal
 This symbol indicates that you have to do something. The ac-
tion you need to take is described step by step.
1.3 Units of measurement
Note Unless specified otherwise, all dimensions are given in
mm.
2. Safety
2.1 Intended use
This appliance is designed for domestic use. It can be safely op-
erated by untrained personnel. The appliance can also be used in
a non-domestic environment, e.g. in a small business, as long as
it is used in the same way.
Any other use beyond that described shall be deemed inappropri-
ate. Observation of these instructions and of instructions for any
accessories used is also part of the correct use of this appliance.
This pressurised appliance is suitable for heating domestic hot
water or for reheating preheated water. The appliance can supply
one or more draw-off points.
2.2 General safety instructions
CAUTION Burns During operation, the tap can reach temperatures in ex-
cess of 60°C.
There is a risk of scalding at outlet temperatures in ex-
cess of 43°C.
!WARNING Injury
The appliance may be used by children aged 8 and up
and persons with reduced physical, sensory or mental
capabilities or a lack of experience provided that they
are supervised or they have been instructed on how to
use the appliance safely and have understood the result-
ing risks. Children must never play with the appliance.
Children must never clean appliance or perform user
maintenance unless they are supervised.
Where children or persons with limited physical, sensory or men-
tal abilities are allowed to use this appliance, we recommend a
permanent temperature limit. The limit can be set by you or a
contractor:
- Childproofing adjustable by the user
- Anti-scalding protection adjustable by the contractor
!Material damage
Protect the appliance and its tap against frost.
2.3 CE designation
The CE designation shows that the appliance meets all essential
requirements according to the:
- Low Voltage Directive
- Electromagnetic Compatibility Directive
The maximum permissible mains impedance is indicated in
chapter "Specification".
2.4 Test symbols
See type plate on the appliance.
Country-specific approvals and certifications: Germany
A general test certificate [Germany] as verification of suitability
regarding noise emissions has been issued for this appliance,
based on the State Building Regulations [Germany].
DIN 4109
PA-IX 6830/I
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OPERATION
Appliance description
24 |DHE SLi www.stiebel-eltron.com
3. Appliance description
This appliance with full electronic control and output matching
keeps the outlet temperature constant. The water is heated by the
electronic control unit with motorised valve to precisely the select-
ed temperature. This occurs regardless of the inlet temperature.
DHW temperature
The DHW outlet temperature can be variably adjusted. The
selected temperature is displayed.
Heating system
The bare wire heating system has a pressure-tested copper casing.
The heating system is suitable for hard and soft water areas; it
has low susceptibility to scale build-up. This system ensures rapid
and efficient DHW availability.
Note The appliance is equipped with an air detector that large-
ly prevents damage to the heating system. If, during op-
eration, air is drawn into the appliance, the heater shuts
down automatically for one minute, thereby protecting
the heating system.
Display backlighting
The display features two-tone backlighting (green/ amber).
Efficiency display
Green ECO backlighting indicates that the appliance is operating
in a particularly economical way
- when the output is less than 80%
- when the maximum output is less than 80% while the inlet
temperature is higher than 35°C
- when the maximum output is less than 80% while the ECO
function is switched on
Under all other operating conditions, the backlighting is amber.
Economy monitor
The appliance has an economy monitor. This is activated by press-
ing the appropriate key. It displays:
- Energy savings*
- Water savings*
- CO2savings*
- Energy consumption
- Water consumption
* Compared to hydraulic instantaneous water heaters. Calculation
for a 3-person household with individual DHW requirements and
usable energy requirements subject to VDI 2067. Electricity and
water costs can be programmed individually.
4. Settings and displays
You can adjust the appliance via the user interface.
Warning indicators in the case of excess temperature
If the inlet temperature is higher than the preferred temperature,
e.g. if water has been preheated by solar energy, then the tem-
perature display flashes and the second display indicates the inlet
temperature. No further heating of the water occurs.
D0000033113
2
1
3
1 Temperature display flashes
2 Inlet temperature display
3 Scalding risk LED; red LED when the temperature setting >
43°C
Recommended setting for operation with a thermostatic valve
Set the temperature at the appliance to 60°C.
Following an interruption of the water supply
See chapter "Restarting"
4.1 User interface on the appliance
D0000033114
1
2
3
4
5
69
78
10
1 Temperature selector
2 Scalding risk LED
3 Memory key
4 Menu key, e.g. ECO
5 Additional value display
6 Heating output display
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OPERATION
Settings and displays
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7 Temperature display
8 Service symbol
9 Fault symbol
10 Economy monitor
When the appliance is delivered the backlighting is set so that
the screen is illuminated automatically as soon as you operate
the selector or a key, or the appliance heats. If the selector or a
key is not pressed or the appliance does not heat for 30seconds,
the backlighting switches off. You can also set the illumination to
be on constantly.
Symbols
26�02�02�1230�
1 2 3 4 5 6
1 Shower programs for good health
2 Automatic water volume control
3 ECO
4 Childproof setting
5 Additional value display
6 Time
4.2 Temperature setting
26�02�02�1321�
32
1
1 Temperature setting 20 - 60°C in steps of 0.5°C,
OFF = heating system is switched off
2 Programmed temperature selection
3 Economy monitor selection
You can store a preferred temperature with memory key M.
 Select the preferred temperature.
 Press the M key for 2 seconds. The temperature display flash-
es once to confirm.
4.3 Economy monitor selection
Example menu structure with currency in euros (Eur)
2 sec.
Reset
M
2 sec.
Reset
M
2 sec.
Reset
M
2 sec.
Reset
M
2 sec.
Reset
M
1
2
3
4
5
2 sec. / time-out 10 sec.
D0000032904
1 Energy saving
The energy saving in euros (Eur) in comparison to hydraulic in-
stantaneous water heaters is calculated and displayed.
2 Water saving
The water saving in euros (Eur) in comparison to hydraulic instan-
taneous water heaters is calculated and displayed.
3 CO2 emissions
The CO2 saving in kg in comparison to hydraulic instantaneous
water heaters is calculated and displayed.
4 Amount of energy
The amount of energy consumed in kWh is displayed.
5 Water consumption
The amount of water consumed in m³ is displayed.
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OPERATION
Settings and displays
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4.4 Appliance settings
Key to symbols
Press once START-menu
Press once Change menu
Hold for 2seconds END
Change settings/ scanning
Menu structure
Eur
Eur
0_00...9999 €/kWh
cur
0_00...9999 cur/kWh
Eur
0_00...9999 €/m³
cur
0_00...9999 €/m³
cur
OFF | 20 - 60 °C
OFF | 4 - 15 l/min
OFF | 1 | 2 | 3 | 4
OFF | 5 - 200 l
l/min
12:00
00:00 - 23:59
Auto
On
bernstein/amber
grün/green
OFF
OFF
OFF
OFF
l/min
Auto
100 %
1
2
3
4
5
6
7
8
13
100 %
2 sec. /
9
10
11
12
14
15
time-out 30 sec.
CO2
0...2000 g/kWh
M
0,22 cur/kWh
5,00 cur/m³
553 g/kWh
0,22 €/kWh
5,00 €/m³
D0000032902
1 ECO water and energy saving function
The ECO function enables you to limit the flow rate to a maxi-
mum value.
ECO on = symbol on user interface
ECO off = no symbol on user interface
2 Childproofing
Childproofing allows you as a user to limit the adjustable tem-
perature at the appliance to a maximum value. Your contractor
can activate the appliance's anti-scalding protection (see chapter
"Service mode").
3 Shower programs for good health
The shower program for good health lets you choose from 4 dif-
ferent shower programs.
WW = domestic hot water, KW = cold water
A Cold prevention
To strengthen the body, we recommend you finish off with a
cold shower; this will trigger a reflex in the body to warm up.
3 min
WW
KW
B Winter pick-me-up
An invigorating end to a winter shower with a final warm-up.
-10°C
WW
WW
3 min 10 sec 10 sec
10 sec 10 sec
C Summer fitness program
The quick contrast shower to increase fitness with a final
warm-up.
WW
KW
3 min
10 sec 10 sec
10 sec 10 sec
D Circulation program
Shower your arms and legs with cold water to boost circu-
lation. Spray from the hands and feet towards the body. You
can then repeat this process with warm water.
WW
KW
3 min 20 sec 20 sec
30 sec 30 sec
4 Automatic water volume control
The automatic water volume control allows you to limit the volume
of water at a high flow rate. When the selected volume of water
is reached, the control automatically reduces the flow rate. The
preferred water temperature is maintained. The automatic water
volume control must be enabled on each occasion prior to filling
the bath. Example of filling a bath with 80 litres: When the bath
has been filled with 80 litres, the control automatically reduces
the flow rate to 4 l/min.
5 Flow rate
You have the option of displaying the flow rate or the time.
6 Setting the time
You have the option of displaying the time or the flow rate. You
can set a time from 00:00 h to 23:59 h. You will need to set the
time again following a power interruption.
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OPERATION

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7 Adjusting the backlighting
You are able to adjust the display backlighting. If you select "Auto"
the illumination will flash during the setting process.
- The backlighting switches on whenever the appliance heats
and with any operation of the user interface.
- If there is no operation for 30seconds the backlighting
switches off.
- If you select "On" the backlighting will remain on constantly.
8 Adjusting the green/amber brightness
You can adjust the brightness of both backlighting colours indi-
vidually.
9 Selecting the currency
Here you can select the currency you wish to display for the en-
ergy and water saving:
Eur = €
cur = any other currency
10 Setting the electricity tariff
Here you can enter your particular electricity tariff in Eur/kWh or
cur/kWh in order to calculate the energy saving.
11 Setting the water tariff
Here you can enter your particular water tariff in €/m³ or cur/m³
in order to calculate the water saving.
12 Setting the CO2 emissions value
The factory default for the CO2 emissions calculation is 553 g
CO2⁄kWh (source: "Reducing energy consumption and CO2 emis-
sions through electrical domestic hot water supply", 2011). You can
also set your own CO2 emissions value if required.
13 Resetting to factory defaults
 Press keys M and i simultaneously for 2 seconds.
The default settings can be found in the dashed box in the dia-
gram.
14 Parameter
This parameter is not relevant to this version of the appliance. It
is not possible to adjust any settings.
15 Parameter
This parameter is not relevant to this version of the appliance. It
is not possible to adjust any settings.
5. Cleaning, care and maintenance
 Never use abrasive or corrosive cleaning agents. A damp
cloth is sufficient for cleaning the appliance.
 Check the taps/valves regularly. You can remove limescale
deposits at the tap outlets using commercially available des-
caling agents.
6. Troubleshooting
Fault  Remedy
The appliance will not
start in spite of a fully
open DHW valve.
There is no mains volt-
age.
Check the fuse/MCB in
your fuse box/distribu-
tion panel.
The aerator in the tap or
shower head is scaled up
or contaminated.
Clean and/or descale the
aerator or shower head.
The water supply has
been interrupted.
Vent the appliance and
the cold water inlet line
(see chapter "Commis-
sioning/ Restarting").
Cold water flows briefly
while hot water is being
drawn.
The air sensor detects air
in the water and briefly
switches the heater off.
The appliance restarts
automatically after
1minute.
Temperatures >43°C. Dynamic anti-scalding
protection is activated.
Dynamic anti-scalding
protection automatically
ceases 2minutes after
draw-off has ended.
If you cannot remedy the fault, notify your heating contractor. To
facilitate and speed up your enquiry, please provide the serial
number from the type plate (000000-0000-000000):
No.: 000000-0000-000000
DHE ... SL
26�02�02�1125�
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INSTALLATION
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 the original accessories and spare parts intended for the
appliance are used.
!Material damage
Observe the maximum inlet temperature. The appliance
can be damaged by higher temperatures. You can limit
the maximum inlet temperature by installing a central
thermostatic valve (see chapter "Appliance description/
Accessories").
7.2 Instructions, standards and regulations
Note Observe all applicable national and local instructions and
regulations, e.g. DIN1988 / DINEN806 in Germany.
- The protection rating IP 25 (hoseproof) can only be ensured
with a correctly fitted cable grommet.
- The specific electrical resistance of the water must not fall
below that stated on the type plate. In a linked water net-
work, observe the lowest electrical water resistance (see
chapter "Specification / Application areas"). Your water
supply utility will advise you of the specific electrical water
resistance or conductivity.
8. Appliance description
8.1 Standard delivery
Delivered with the appliance:
- Mounting bracket
- Installation template
- 2 twin connectors
- Cross-piece
- Tee
- Flat gaskets
- Strainer
- Plastic profile washer
- Plastic connection pieces/ installation aid
- Cover and back panel guides
8.2 Accessories
Remote controls
- FFB 1 SL - Wireless remote control
Control from two locations
- FFB 2 SL - Wireless remote control
Wireless remote control unit as extension of the FFB 1 SL
- FB 1 SL - Hardwired remote control
Control only with remote control unit, suitable for self-sup-
porting installation
Taps/valves
- MEKD - kitchen pressure tap
- MEBD - bath pressure tap
Plug G½A
The plugs are required if you use pressure taps for finished walls
other than the ones recommended in the accessories.
Installation set for finished walls
- Solder fitting - copper pipe for solder connection Ø12mm
- Compression fitting - copper pipe
- Compression fitting - plastic pipe (suitable for Viega: San-
fix-Plus or Sanfix-Fosta)
Universal mounting frame
Mounting frame with electrical connections.
Pipe assembly for undersink appliances
This assembly for undersink installation is required if you need to
have the water connections (G⅜A) above the appliance.
Pipe assembly for offset installation
This pipe assembly with pipe bends is required if you need to
have the appliance vertically offset against the water connection
by approx. 90mm downwards.
Pipe assembly for replacing a gas water heater
This pipe assembly is required if the installation has existing gas
water heater connections (cold water connection on the left and
DHW connection on the right).
Pipe assembly DHB water plug-in couplings
2 water plug-in couplings allow the appliance to be connected to
the available water plug-in connections of a DHB.
Load shedding relay (LR 1-A)
The load shedding relay which needs to be installed in the dis-
tribution board provides priority control for the instantaneous
water heater when operating, for example, electric storage heat-
ers simultaneously.
ZTA 3/4 - central thermostatic valve
Thermostatic valve for central premixing, for example for an in-
stantaneous water heater with a solar thermal system.
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INSTALLATION
Preparations
9. Preparations
 Flush the water line thoroughly.
Taps/valves
 Use suitable taps (see chapter "Appliance description/ Acces-
sories"). Open taps are not permitted.
A safety valve is not required.
Note Never use the cross-piece to reduce the flow rate. It is
intended to shut off the appliance.
Permissible water pipe materials
- Cold water inlet pipe:
Galvanised steel pipe, stainless steel pipe, copper pipe or
plastic pipe
- DHW outlet pipe:
Stainless steel pipe, copper pipe or plastic pipe
!Material damage
If plastic pipework systems are used, take into account
the maximum inlet temperature and the maximum pres-
sure (see chapter "Specification / Data table").
Flow rate
 Ensure that the flow rate (see chapter "Specification / Data
table", On) for switching on the appliance is achieved.
 Increase the mains water pressure if the required flow rate is
not achieved with the draw-off valve fully opened.
Flexible water connection lines
 If the appliance is installed with flexible water connection
lines, ensure that the pipe bends do not become twisted.
Pipe bends have a bayonet fitting and are installed inside the
appliance.
 Secure the back panel at the bottom with an additional
screw.
9.1 Installation site
!Material damage
Install the appliance in a room free from the risk of frost.
 Always install the appliance vertically near the draw-off
point.
The appliance is suitable for undersink and oversink installations.
Note The appliance must be fitted to a wall with sufficient
load-bearing capacity.
Undersink installation
D0000034274
1
2
1 Cold water inlet
2 DHW outlet
Oversink installation
D0000034275
21
1 Cold water inlet
2 DHW outlet
9.2 Factory settings
The appliances are prepared in the delivered condition:
- Power supply from below, installation on unfinished walls
- Water connection, installation on unfinished walls
- For the appliance with connected load changeover, the aver-
age connected load is preset.
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30 |DHE SLi www.stiebel-eltron.com
INSTALLATION
Installation
10. Installation
This chapter describes installation in accordance with the factory
settings.
For further installation options, see chapter "Installation alter-
natives".
26�02�02�0543
 Open the appliance.
26�02�02�1101
 Remove the back panel by pressing the two locking hooks
and pulling the lower part of the back panel towards the
front.
26�02�02�0810�
 Mark out the holes for drilling with the installation template.
If the appliance is to be installed with water connections for
finished walls, also mark out the fixing hole in the lower part
of the template.
 Drill the holes and secure the mounting bracket with
2screws and 2rawl plugs (screws and rawl plugs are not
part of the standard delivery).
Note If you are installing the appliance with flexible water con-
nections, secure the back panel with a screw.
 Fit the mounting bracket.
160
30
1
26�02�02�0824�
1 Installation aid
 Prepare the power cable.
Making the water connection
!Material damage
Carry out all water connection and installation work in
accordance with regulations.
26�02�02�0798
 Seal and insert the twin connectors.
26�02�02�1307�
1
4
5
2
3
2
1 DHW with tee
2 Gasket
3 Cold water with cross-piece
4 Strainer
5 Profile washer
 Fit the water connections.
!Material damage
The strainer must be fitted for the appliance to function.
 When replacing the appliance, check that the strain-
er is present.
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INSTALLATION
Installation
Installing the appliance
1821 24
kW
26�02�02�0934�
 For easy installation, push the cable grommet of the upper
electrical connection into the back panel from behind.
 Remove the transport plugs from the water connections.
 Remove the fixing toggle from the upper part of the back
panel.
 Route the power cable from behind through the cable grom-
met until it rests against the cable sheath. Align the power
cable.
In the case of a cross-section >6mm², enlarge the hole in
the cable grommet.
 Push the appliance over the threaded stud of the mounting
bracket, so that it breaks through the soft seal. If necessary,
use a screwdriver.
 Push the fixing toggle onto the threaded stud of the mount-
ing bracket.
 Press the back panel firmly into place and lock the fixing tog-
gle by turning it clockwise through 90°.
26�02�02�0921
 Fit the pipes with flat gaskets onto the twin connectors.
Connecting the power supply
WARNING Electrocution Carry out all electrical connection and installation work
in accordance with relevant regulations.
WARNING Electrocution Connection to the power supply is only permissible in
the form of a permanent connection in conjunction with
the removable cable grommet. Ensure that the appliance
can be separated from the power supply by an isolator
that disconnects all poles with at least 3mm contact
separation.
WARNING Electrocution Ensure that the appliance is earthed.
26�02�02�1122�
 Connect the power cable to the mains terminal (see chapter
"Specification / Wiring diagram"). The specified voltage must
match the mains voltage.
Connected load options
You can choose from 3 connected load stages. The middle load
is preset. If you wish to select a different load, please follow the
steps below.
18 21 24
kW
26�02�02�0935�
 Select the connected load you require (see chapter "Specifi-
cation/ Data table").
 Replug the coding card in accordance with the selected con-
nected load.
 Change the type plate. Tick the selected connected load.
Please use a ballpoint pen to do this.
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32 |DHE SLi www.stiebel-eltron.com
INSTALLATION
Installation
10.1 Completing the installation
26�02�02�1102�
 Fit the lower part of the back panel. Ensure that it clicks into
place.
 Align the mounted appliance by loosening the fixing toggle,
aligning the power supply and back panel, and then re-tight-
ening the fixing toggle. If the back panel of the appliance is
not flush, the appliance can be secured at the bottom with an
additional screw.
10.2 Alternative installation methods
- Power supply from above for unfinished walls
- Power supply for finished walls
- Large cross-section for power supply from below
- Connecting a load shedding relay
- Water installation for finished walls
- Water installation for finished walls with solder/ compres-
sion fitting
- Water installation for finished walls, fitting the appliance
cover
- Installation of lower part of back panel with threaded fitting
for finished walls
- Use of existing mounting bracket when replacing an
appliance
- Installation with offset tiles
- Turned appliance cover
- Operation with preheated water
Power supply from above for unfinished walls
26�02�02�1123�
 Cut off the cable grommet for the power cable.
 Push down the locking hook that secures the mains terminal,
then remove the mains terminal.
 Reposition the mains terminal in the appliance from the
bottom to the top and secure the mains terminal by sliding it
under the locking hook.
26�02�02�1306�
 Route the control wires below the wire guide.
Power cable for finished walls
 Cut or break out the required entries in the back panel and
appliance cover cleanly (for positions, see chapter "Specifica-
tion/ Dimensions and connections"). If necessary, use a file.
 Route the power cable through the cable grommet and con-
nect it to the mains terminal.
Note This type of connection changes the protection rating of
the appliance.
 Change the type plate. Cross out "IP 25" and mark
the box "IP 24". Please use a ballpoint pen to do this.
Large cross-section for power supply from below
If cables with a large cross-section are used, the cable grommet
can be fitted after the appliance has been installed.
1.
3. 4.
2.
26�02�02�1124�
 Before installing the appliance, use a screwdriver to push the
cable grommet out.
 Push the cable grommet over the power cable. For this, use
the installation aid. In the case of a cross-section >6mm²,
enlarge the hole in the cable grommet.
 Push the cable grommet into the back panel.
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INSTALLATION
Installation
Connecting a load shedding relay
Install the load shedding relay in the distribution board in conjunc-
tion with other electric appliances, e.g. electric storage heaters.
The relay responds when the instantaneous water heater starts.
The load shedding relay is available as an accessory.
!Material damage
Connect the phase that switches the load shedding relay
to the indicated terminal of the mains terminal in the
appliance (see chapter "Specification / Wiring diagram").
Water installation for finished walls
Suitable pressure-tested taps can be ordered as accessories.
D0000033104
1
2
1 Water plug
2 Pressure tap for finished walls
 Fit the water plugs with gaskets to seal the connection below
the plaster. With pressure taps listed in the accessories, the
plugs and gaskets are part of the standard delivery.
 Install the tap.
 Place the lower part of the back panel under the connection
pipes of the tap and push the lower part of the back panel
into place.
 Secure the connection pipes to the appliance.
Water installation for finished walls with solder/ compression
fitting
You can connect copper or plastic pipes with solder fitting or
compression fitting accessories.
The solder fitting with threaded fitting is suitable for 12mm cop-
per pipes.
 Push the union nuts over the connection pipes.
 Solder the inserts to the copper pipes.
 Push the lower part of the back panel under the connection
pipes of the tap and click the lower part of the back panel
into place.
 Secure the connection pipes to the appliance.
Note Observe the tap manufacturer's instructions.
Water installation for finished walls, fitting the appliance cover
26�02�02�0552�
4
3
2
1
1 Back panel guides
2 Screw
3 Cover guides
4 Knock-out
 Cleanly break out the knock-outs in the appliance cover. If
necessary, use a file.
Note If the tap connection pipes are slightly offset, the appli-
ance can be sealed using the tabs on the cover guides.
 If the tap connection pipes are offset, do not fit any
back panel guides.
 If installing tap connection pipes which are not offset, break
off the tabs on the cover guides.
 Click the cover guides into place in the knock-outs.
 Position the back panel guides on the pipes and push them
together. Then push the guides until they are resting against
the back panel.
 Secure the back panel at the bottom with a screw.
Installation of lower part of back panel with threaded fitting
for finished walls
You can install the lower part of the back panel after fitting the
taps.
2
1
26�02�02�1080
1 Screw
2 Connection pieces from the pack
 Cut open the lower part of the back panel at the markings.
 Fit the lower part of the back panel by bending it out at the
sides and guiding it over the pipes.
 Insert the connection pieces from behind into the lower part
of the back panel.
 Click the lower part of the back panel into place.
 Secure the lower part of the back panel with a screw.
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INSTALLATION
Installation
Mounting bracket for appliance replacement
Am existing StiebelEltron mounting bracket may be used when
replacing appliances (except instantaneous water heater DHF).
 Break through the back panel of the appliance for the thread-
ed stud on the pre-installed mounting bracket.
DHF replacement
26�02�02�0815�
 Reposition the threaded stud on the mounting bracket (the
stud has a self-tapping thread).
 Rotate the mounting bracket through 180° and mount it on
the wall (the DHF logo is then turned towards the reader).
Installation with offset tiles
110
20
26�02�02�1066�
2
1
1 Minimum contact area of the appliance
2 Maximum tile offset
 Adjust the wall clearance and lock the back panel with the
fixing toggle by turning it clockwise through 90°.
Turned appliance cover
The appliance cover can be turned for undersink installation.
electroniccomfort
electro n i c co m f o r t
26�02�02�0553
 Remove the programming unit from the appliance cover by
pressing the locking hooks and taking out the programming
unit.
 Turn the appliance cover (not the appliance) and refit the
programming unit, ensuring that all locking hooks click into
place. When clicking the locking hooks into place, make sure
you press against the inner side of the appliance cover (shad-
ed area).
 Plug the set value transducer cable into the PCB (see chapter
"Commissioning").
 Hook the appliance cover back in at the bottom and pivot it
up onto the back panel.
 Ensure the all-round seal of the back panel sits tightly by
pushing the cover gently forwards and back.
 Secure the appliance cover.
Operation with preheated water
By installing a central thermostatic valve you will limit the max-
imum inlet temperature (see chapter "Appliance description/
Accessories").
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INSTALLATION

11. Commissioning
WARNING Electrocution Commissioning may only be carried out by an authorised
contractor in accordance with safety regulations.
11.1 Commissioning
 Open the cross-piece.
on
on
26�02�02�0554
 Open and close all connected draw-off valves several times,
until all air has been vented from the pipework and the
appliance.
 Carry out a tightness check.
 Activate the safety switch (AE 3) by firmly pressing in the
reset button (the appliance is delivered with the safety switch
deactivated).
 Push the set value transducer cable plug onto the PCB.
 Fit the appliance cap and secure it with a screw.
 Switch the mains power ON.
 Check the function of the appliance.
 Remove the protective foil from the user interface.
Appliance handover
 Explain the appliance function to users and familiarise them
with its operation.
 Make the user aware of potential dangers, especially the risk
of scalding.
 Hand over these instructions.
11.2 Recommissioning
!Material damage
Following an interruption of the water supply the appli-
ance must be recommissioned by carrying out the follow-
ing steps, in order to prevent the destruction of the bare
wire heating system.
 Disconnect the appliance from the power supply by
removing the fuses/tripping the MCBs.
 Open the tap for one minute until the appliance and
its upstream cold water inlet line are free of air.
 Switch the mains power back ON again.
12. Service mode
26�02�02�1323�
 Open the appliance cover and hook it on the side of the back
panel.
26�02�02�0556�
1
1 Service button for activating and deactivating service mode
Key to symbols
Press once START
Press once END
Change settings/ scanning
In service mode you are able to call up and/or change the set
temperature using the M key (60°C).
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36 |DHE SLi www.stiebel-eltron.com
INSTALLATION
Shutting down
Scanning the error menu
The error menu only appears if the appliance has a fault.
26�02�02�1313�
1 2 3 4
1 Electronic assembly symbol
 Replace the electronic assembly.
2 Safety circuit symbol
 Check the AE3 connection; replace the AE3 if required.
3 Outlet sensor symbol
 Check the outlet sensor connection; replace the outlet sensor
if required.
4 Motorised valve symbol
 Check the motorised valve connection; replace the motorised
valve if required.
Scanning the control menu
26�02�02�1312�
1 2 3 4
1 Inlet temperature symbol,
shows the current inlet temperature (shows 1.0°C if the sen-
sor is faulty).
2 Outlet temperature symbol,
shows the current outlet temperature (shows 65.0°C if the
sensor is faulty).
3 Flow rate symbol,
shows the current flow rate.
4 Power consumption symbol,
shows the current power consumption.
Scanning the appliance data menu
26�02�02�1314�
1 2 3 4
1 Service code symbol,
information for service engineers.
2 Symbol for power supply runtime,
accumulated runtime in days.
3 Heating hours symbol,
accumulated heating time in hours.
4 Maximum output symbol
The value shown may diverge by several kW from the rated
output if mains voltages other than 400V prevail.
Setting the anti-scalding protection
Use the anti-scalding protection in places such as nurseries and
hospitals. If anti-scalding protection is selected, the childproofing
adjustment will be limited (see chapter "Appliance settings").
26�02�02�1301�
Setting range: 21 - 60°C
Recommended setting 43°C
Note The anti-scalding protection setting can only be modified
by your contractor. Simultaneously pressing the M + i key
will not change the setting.
13. Shutting down
 Isolate all poles of the appliance from the power supply.
 Drain the appliance (see chapter "Maintenance").
14. Troubleshooting
WARNING Electrocution In order to check the appliance, it must be supplied with
power.
Plug-in connections on the PCB
26�02�02�1343
1
5
6
7
2
34
1 Diagnostic traffic light (3 LEDs)
2 Flow rate sensor DFE
3 Motorised valve
4 High limit safety cut-out STB
5 Outlet sensor NTC
6 Set temperature transducer
7 Safety switch AE 3; plug-in connection secured with locking
tab.
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INSTALLATION
Troubleshooting
Possible indications of diagnostic traffic light (LED)
Red Illuminates in case of faults
Yellow Illuminates in heating mode
Green Flashing: appliance is supplied with mains power
Fault  Diagnostic traf-
fic light
Remedy
The appliance does not
heat up/ the set tem-
perature is not reached.
There is no mains voltage. No LED illuminates Check the MCB/fuse in your fuse box.
The safety switch (AE 3) has
responded.
No LED illuminates Remove the cause of the fault.
Protect the system against overheating by opening a draw-off valve downstream
of the appliance for one minute. This cools down the heating system. Activate the
safety switch by pressing the pushbutton on the safety switch (see also chapter
"Commissioning").
The PCB is faulty. No LED illuminates Check the PCB and replace if necessary.
A phase has failed. Flashing green LED,
yellow LED on
Check the MCB/fuse in your fuse box.
The inlet temperature is
>55°C.
Flashing green LED,
red LED illuminates
Limit the inlet temperature.
The flow rate sensor (DFE) is
faulty or not attached.
Flashing green LED,
yellow LED off
Check the connection of the flow rate sensor and replace if necessary.
The heater is faulty. Flashing green LED,
yellow LED on
Check the heater and replace if necessary.
The inlet sensor is faulty. Flashing green LED,
red LED illuminates
Replace the PCB.
The outlet sensor is faulty. Flashing green LED,
red LED illuminates
Check the connection of the outlet sensor and replace if necessary.
A fault in the safety PCB. Flashing green LED,
red LED only during
draw-off
Connect the connecting cable from the safety switch and check the safety switch.
A loose or faulty connecting
cable to the set value trans-
ducer.
Green LED flashes Connect the connecting cable from the set value transducer and check the con-
necting cable.
The set value transducer is
faulty.
Green LED flashes Check the set value transducer and replace it if required.
Temperature limiting is acti-
vated.
Green LED flashes Disable temperature limiting.
The display on the ap-
pliance is completely off.
A loose connecting cable to the
set value transducer.
Green LED flashes Connect the connecting cable at the set value transducer and check the connect-
ing cable.
The programming PCB is faulty. Green LED flashes Check the programming unit and replace if necessary.
The flow rate is too low. The shower head/ aerators are
scaled up.
Descale or if necessary replace the shower head/ aerators.
The strainer is contaminated. Clean the strainer.
The set value cannot be
adjusted higher than
43°C.
Temperature limiting is acti-
vated.
Green LED flashes Disable temperature limiting.
Cold water flows briefly
during draw-off.
The flow rate
(<2 l/min) is too low.
The appliance restarts automatically when a flow rate of >2.5 l/min has been
detected.
The air sensor detects the
presence of air in the water and
briefly switches the heater off.
The appliance restarts after one minute.
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38 |DHE SLi www.stiebel-eltron.com
INSTALLATION
Maintenance
15. Maintenance
WARNING Electrocution Before any work on the appliance, disconnect all poles
from the power supply.
Draining the appliance
You can drain the appliance for maintenance work or to protect
it from frost.
CAUTION Scalding Hot water may escape when draining the appliance.
 Close the shut-off valve in the cold water supply line.
 Open all draw-off valves.
 Undo the water connections on the appliance.
 Store the dismantled appliance in a room free from the risk
of frost, as water residues remaining inside the appliance can
freeze and cause damage.
16. Specification
16.1 Dimensions and connections
478
100
414
44
105≤ 20225
140
30
35
35
114
368
b02
c01c06
D0000017971
b02 Entry electrical cables I
c01 Cold water inlet Male thread G 1/2 A
c06 DHW outlet Male thread G 1/2 A
Alternative connection options
165
50
44
30
35
72
325
338
47
b03
b02
b04
b04
b04
b04 b04
D0000019212
b02 Entry electrical cables I
b03 Entry electrical cables II
b04 Entry electrical cables III
16.2 Wiring diagram
3/PE ~ 400 V
L
2
III1
L2` L3`L1`
3/4
1342
III
UF
L L
85�02�02�0004�
13
4
2
1 Power PCB
2 Bare wire heating system
3 High limit safety cut-out
4 Safety switch
Priority control with load shedding relay (LR 1-A)
See also chapter "Appliance description / Accessories".
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INSTALLATION

85�02�02�0003�
2
1
1 Control cable to the contactor of the second appliance (e.g.
electric storage heater).
2 Control contact opens when switching the instantaneous
water heater on.
16.3 Mixed water volume/ outlet volume
The values are relative to a rated voltage of 400V. The mixed
water volume and outlet volume are subject to the available supply
pressure and the available mains voltage.
Available temperature approx. 38°C in the shower, for hand
washing, filling the bath etc.
6 10 14
3
2
1
6
7
8
9
10
11
12
13
14
15
84�02�02�0027�
Outlet temperature approx. 60°C for the kitchen sink and when
using thermostatic valves.
6 10 14
4
5
6
7
8
3
2
1
84�02�02�0028�
X Cold water inlet temperature in °C
Y Mixed water volume/ outlet volume in l/min
1 18kW
2 21kW
3 24 kW
16.4 Application areas
Specific electrical resistance and specific electrical conductivity
Standard
specification

 
Resistance Ω cm ≥ 900 ≥ 800 ≥ 735
Conductivity mS/m ≤ 111 ≤ 125 ≤ 136
Conductivity µs/cm ≤ 1100 ≤ 1250 ≤ 1360
16.5 Pressure drop
Taps/valves
Pressure drop at taps at flow rate of 10 l/min
Mono-lever mixer tap, approx. MPa 0.04 - 0.08
Thermostatic valve, approx. MPa 0.03 - 0.05
Hand shower, approx. MPa 0.03 - 0.15
Sizing the pipework
When calculating the size of the pipework, a pressure drop for the
appliance of 0.1MPa is recommended.
16.6 Fault conditions
In case of faults, loads up to a maximum of 80°C at a pressure of
1.0MPa can occur temporarily in the installation.
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40 |DHE SLi www.stiebel-eltron.com
INSTALLATION

16.7 Data table
DHE 18 SLi 25 A DHE 18/21/24 SLi DHE 27 SLi
227492 227493 227494
Electrical data
Rated voltage V380 400 415 380 400 415 380 400 415
Rated output kW 16.2 18 19.4 16.2/19/21.7 18/21/24 19.4/22.6/25.8 24.4 27 29.1
Rated current A24.7 26 27 27.6/31.4/33.3 29/33/35 30.1/34.3/36.3 37.1 39 40.5
Fuse/MCB rating A25 25 32 32/32/35 32/32/35 32/35/40 40 40 40
Phases 3/PE 3/PE 3/PE
Frequency Hz 50/60 50/60 50/-
Max. mains impedance at 380V / 50Hz Ohm 0.3 0.33 0.2
Max. mains impedance at 380V / 60Hz Ohm 0.36 0.4
Max. mains impedance at 400V / 50Hz Ohm 0.28 0.31 0.19
Max. mains impedance at 400V / 60Hz Ohm 0.34 0.38
Max. mains impedance at 415V / 50Hz Ohm 0.27 0.3 0.18
Conductivity at 15 °C mS/m 111 111 111
Specific resistance (≤25 °C) Ohm cm 900 900 900
Specific resistance (≤55 °C) Ohm cm 900 900 900
Connections
Water connection G 1/2 A G 1/2 A G 1/2 A
Application limits
Max. permissible pressure MPa 1 1 1
Max. inlet temperature for reheating °C 55 55 55
Values
Max. permissible inlet temperature °C 65 65 65
On l/min > 2.5 > 2.5 > 2.5
Flow rate for pressure drop l/min 5.2 5.2/6.0/6.9 7.7
Pressure drop at flow rate MPa 0.04 0.04/0.06/0.08 0.1
DHW delivery l/min 9.2 9.2 / 10.7 / 12.3 13.8
Delta T if presented K 28 28 28
Hydraulic data
Nominal capacity l0.4 0.4 0.4
Versions
Connected load options - X -
Temperature setting °C 20-60 20-60 20-60
Safety category 1 1 1
Insulating block Plastic Plastic Plastic
Heating system Bare wire Bare wire Bare wire
Cap and back panel Plastic Plastic Plastic
Colour White White White
IP rating IP25 IP25 IP25
Dimensions
Height/width/depth mm 478 225 105 478 225 105 478 225 105
Weights
Weight kg 4.5 4.5 4.5
299680_DHE_18-27_SLi_de_en_fr_nl_pl_cs_bg_ru.indb 40 05.03.2013 08:38:31