STIEBEL ELTRON DHE 18 Instruction Manual

Vollelektronisch geregelter Komfort-Durchlauferhitzer| Fully electronically controlled
comfort instantaneous water heater| Chauffe-eau instantané confort à régulation
entièrement électronique | Volledig elektronisch geregelde comfort-doorstromer | Plně
elektronicky regulovaný komfortní průtokový ohřívač | Całkowicie elektronicznie regulowany
komfortowy przepływowy ogrzewacz wody |
» DHE 18/21/24
» DHE 27
BEDIENUNG UND INSTALLATION
OPERATION AND INSTALLATION
UTILISATION ET INSTALLATION
BEDIENING EN INSTALLATIE
OBSLUHA A INSTALACE
OBSŁUGA I INSTALACJA



56 | DHE www.stiebel-eltron.com
CONTENTS
SPECIAL INFORMATION
OPERATION
1. General information ��������������������������������������� 59
1.1 Safety instructions���������������������������������������������� 59
1.2 Other symbols in this documentation ����������������������60
1.3 Units of measurement �����������������������������������������60
2. Safety�������������������������������������������������������� 61
2.1 Intended use����������������������������������������������������� 61
2.2 General safety instructions ����������������������������������� 61
2.3 Test symbols ����������������������������������������������������� 62
2.4 EU Declaration of Conformity �������������������������������� 62
3. Appliance description ������������������������������������� 62
4. Settings and displays �������������������������������������� 63
4.1 User interface ��������������������������������������������������� 63
4.2 Display symbols�������������������������������������������������64
4.3 Selecting the set temperature�������������������������������� 64
4.4 Temperature limit via internal anti-scalding
protection (qualified contractor)����������������������������� 65
4.5 Temperature limit Tmax (user)������������������������������� 65
4.6 Assigning temperature memory buttons ������������������ 65
4.7 Inlet temperature information ������������������������������� 65
4.8 Info menu �������������������������������������������������������� 65
4.9 Settings in the parameter menu�����������������������������66
4.10 Recommended settings ��������������������������������������� 70
5. Cleaning, care and maintenance ������������������������� 70
6. Troubleshooting �������������������������������������������� 71
INSTALLATION
7. Safety�������������������������������������������������������� 72
7.1 General safety instructions �����������������������������������72
7.2 Shower operation����������������������������������������������� 72
7.3 Instructions, standards and regulations �������������������72
8. Appliance description ������������������������������������� 73
8.1 Standard delivery����������������������������������������������� 73
8.2 Accessories������������������������������������������������������� 73
9. Preparation ������������������������������������������������� 74
9.1 Installation site�������������������������������������������������� 74
9.2 Minimum clearances������������������������������������������� 75
9.3 Water installation����������������������������������������������� 75
10. Installation�������������������������������������������������� 76
10.1 Standard installation������������������������������������������� 76
11. Commissioning ��������������������������������������������� 81
11.1 Preparation ������������������������������������������������������ 81
11.2 Initial start-up��������������������������������������������������� 82
11.3 Recommissioning����������������������������������������������� 84
12. Appliance shutdown ��������������������������������������� 84
13. Installation alternatives ����������������������������������� 84
13.1 Electrical connection from above on unfinished walls�� 85

www.stiebel-eltron.com DHE | 57
ENGLISH
CONTENTS
13.2 Electrical connection on unfinished walls from below
with short power cable���������������������������������������� 86
13.3 Electrical connection on finished walls ��������������������86
13.4 Connecting a load shedding relay��������������������������� 87
13.5 Water installation on finished walls ������������������������ 87
13.6 Water installation on finished walls with solder/press
fittings ������������������������������������������������������������88
13.7 Fitting appliance cover for water installation on
finished walls���������������������������������������������������� 88
13.8 Lower back panel section installation with threaded
fittings on finished walls �������������������������������������� 89
13.9 Wall mounting bracket when replacing an appliance��� 90
13.10 Installation with offset tiles�����������������������������������90
13.11 Rotated appliance cover��������������������������������������� 91
13.12 Operation with preheated water ���������������������������� 91
13.13 Horizontal installation of the appliance�������������������� 92
14. Service information���������������������������������������� 93
15. Troubleshooting �������������������������������������������� 94
15.1 Fault code display ���������������������������������������������� 96
16. Maintenance ������������������������������������������������ 97
17. Specification ������������������������������������������������ 98
17.1 Dimensions and connections��������������������������������� 98
17.2 Wiring diagram ������������������������������������������������� 99
17.3 DHW output���������������������������������������������������� 100
17.4 Application areas/ conversion table ��������������������� 100
17.5 Pressure drop ��������������������������������������������������101
17.6 Fault conditions ������������������������������������������������101
17.7 Energy consumption data������������������������������������101
17.8 Data table �������������������������������������������������������102
GUARANTEE
ENVIRONMENT AND RECYCLING

SPECIAL INFORMATION
58 | DHE www.stiebel-eltron.com
SPECIAL INFORMATION
- The appliance may be used by children over
3years of age and persons with reduced
physical, sensory or mental capabilities or a
lack of experience and expertise, provided
that they are supervised or they have been
instructed on how to use the appliance safe-
ly and have understood the potential risks.
Children must never play with the appliance.
Cleaning and user maintenance must not be
carried out by children without supervision.
- During operation, the tap can reach tempera-
tures up to 70°C. There is a risk of scalding at
outlet temperatures in excess of 43°C.
- The appliance is suitable for supplying a
shower (shower operation). If the appliance
is also or exclusively used for shower opera-
tion, the qualified contractor must adjust the
temperature setting range to 55°C or less
using the internal anti-scalding protection on
the appliance. When using preheated water,
ensure that the inlet temperature does not ex-
ceed 55°C.
- Ensure the appliance can be separated from
the power supply by an isolator that discon-
nects all poles with at least 3mm contact
separation.
- The specified voltage must match the power
supply.
- The appliance must be connected to the earth
conductor.

www.stiebel-eltron.com DHE | 59
OPERATION
General information
ENGLISH
- The appliance must be permanently connect-
ed to fixed wiring.
- Secure the appliance as described in chapter
"Installation/ Installation".
- Observe the maximum permissible pressure
(see chapter "Installation/ Specification/ Data
table").
- The specific water resistivity of the mains
water supply must not be undershot (see
chapter "Installation/ Specification/ Data
table").
- Drain the appliance as described in chapter
"Installation/ Maintenance/ Draining the
appliance".
OPERATION
1. General information
The chapters "Special information" and "Operation" are intended
for both users and qualified 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 these 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.

OPERATION
General information
60 | DHE www.stiebel-eltron.com
1.1.2 Symbols, type of risk
Symbol Type of risk
Injury
Electrocution
Burns
(burns, 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-seri-
ous or minor injury.
1.2 Other symbols in this documentation
Note General information is identified by the adjacent symbol.
 Read these texts carefully.
Symbol Meaning
Material losses
(appliance damage, consequential losses and environmen-
tal pollution)
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 All measurements are given in mm unless otherwise
stated.
!
!

www.stiebel-eltron.com DHE | 61
OPERATION
Safety
ENGLISH
2. Safety
2.1 Intended use
This appliance is suitable for heating domestic hot water or for
reheating preheated water. The appliance can supply one or more
draw-off points.
Water will not be reheated if the maximum inlet temperature for
reheating is exceeded.
The appliance is intended for domestic use. It can be used safely
by untrained persons. The appliance can also be used in non-do-
mestic environments, e.g. in small businesses, as long as it is
used in the same way.
Any other use beyond that described shall be deemed inappro-
priate. Observation of these instructions and of the instructions
for any accessories used is also part of the correct use of this
appliance.
2.2 General safety instructions
CAUTION Burns During operation, the tap can reach temperatures up to
70°C. There is a risk of scalding at outlet temperatures
in excess of 43°C.
CAUTION Burns If children or persons with limited physical, sensory or
mental capabilities use the appliance, set a temperature
limit. Once set, check the temperature limit is working
correctly.
If a permanent and unchangeable temperature limit is
required, have the internal anti-scalding protection set
by a qualified contractor.
CAUTION Burns If operating with preheated water, e.g. if using a solar
thermal system, observe the following information:
-The DHW temperature may exceed the set tempera-
ture or a set temperature limit.
-The dynamic anti-scalding protection between the
appliance and a wireless remote control may not be
effective.
 In such cases, limit the temperature with an up-
stream central thermostatic valve (e.g. ZTA3/4).

OPERATION
Appliance description
62 | DHE www.stiebel-eltron.com
!WARNING Injury
The appliance may be used by children over 3years of
age and persons with reduced physical, sensory or men-
tal capabilities or a lack of experience and expertise,
provided that they are supervised or they have been
instructed on how to use the appliance safely and have
understood the potential risks. Children must never play
with the appliance. Cleaning and user maintenance must
not be carried out by children without supervision.
!Material losses
The user should protect the appliance and its tap against
frost.
2.3 Test symbols
See type plate on the appliance.
2.4 EU Declaration of Conformity
Note DHE: STIEBELELTRON hereby declares that the radio
equipment type complies with Directive 2014/53/EU. The
full text of the EU Declaration of Conformity can be found
at the following internet address:
www.stiebel-eltron.de/downloads
3. Appliance description
The appliance switches on automatically as soon as you open the
hot water valve on the tap. When you close the tap, the appliance
switches off again automatically.
The appliance heats water as it flows through it. The set tempera-
ture is adjustable. Upwards of a certain flow rate, the control unit
selects the required heating output, subject to the temperature
selected and the cold water temperature.
The instantaneous water heater with full electronic control and
automatic output matching maintains a consistent outlet tempera-
ture. The fully electronic control unit with motorised valve ensures
the water is accurately heated to the selected temperature. This
occurs regardless of the inlet temperature.
If the appliance is operated with preheated water and the inlet
temperature exceeds the selected temperature, the inlet tempera-
ture is indicated on the second display line and flashes. The water
is not heated further.
You can store different set temperatures and call them up quickly.
In the ECO function, the integral motorised valve limits the flow
rate to 3preset levels. The appliance has setting options for a
temperature limit (Tmax function, user) and internal anti-scald-
ing protection (qualified contractor). The backlight switches on
automatically as soon as water starts to flow through the appli-
ance or you make a change on the user interface. The backlight
switches off automatically after water stops flowing or if no action
is performed.

www.stiebel-eltron.com DHE | 63
OPERATION
Settings and displays
ENGLISH
Heating system
The bare wire heating system is enclosed within a pressure-tested
plastic jacket. The heating system with its stainless steel heater
spiral is suitable for hard and soft water areas and is largely in-
susceptible to scale build-up. The heating system ensures rapid
and efficient DHW provision.
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 appliance
shuts down heating output for one minute to protect the
heating system.
4. Settings and displays
4.1 User interface
D0000091079
2
3
1
8
5
6
7
4
1 Selector
2 ON LED
3 Temperature memory keys
4 Backlit display
5 Main display | info display | parameter display
6 Segment display [10 - 100%]
7 Second display line
8 "i" button to call up information and select menus

OPERATION
Settings and displays
64 | DHE www.stiebel-eltron.com
4.2 Display symbols
The symbols are shown on the display when activated.
7
8
1 2 6543
D0000073618
1 Wellness showers
2 Automatic water volume control
3 ECO display
4 Tmax, displayed when temperature limit is enabled
5 Consumption indicator
6 Time
7 Operating lock [ON/ OFF]
8 Spanner symbol, appears in the event of a fault
4.3 Selecting the set temperature
D0000091079
2
1
1 Set temperature settings: OFF, 20 - 60°C
2 To call up/assign preferred temperatures
Settings
Setting Step Setting Step
20°C ... 60°C 0.5°C 68°F ... 140°F 1°F
4.4 Temperature limit via internal anti-scalding
protection (qualified contractor)
If required, the qualified contractor can set a permanent temper-
ature limit, for example in nurseries, hospitals,etc.

www.stiebel-eltron.com DHE | 65
OPERATION
Settings and displays
ENGLISH
When supplying a shower, the appliance temperature setting
range must be adjusted by the qualified contractor to 55°C or less.
If the anti-scalding protection function is enabled and the tem-
perature limit is reached, "Tmax" flashes.
4.5 Temperature limit Tmax (user)
You can adjust the temperature limit individually. If the tempera-
ture limit is enabled, "Tmax" is shown on the display.
4.5.1 Activating/deactivating the temperature limit Tmax
See chapter "Settings in the parameter menu".
4.6 Assigning temperature memory buttons
Memory buttons "1" and "2" can each be assigned a preferred
temperature.
 Select the preferred temperature.
 To save the preferred temperature, press and hold button
"1" or "2" for more than 3seconds. The selected temperature
flashes once to confirm.
4.7 Inlet temperature information
If the appliance is operated with preheated water and the inlet
temperature exceeds the selected set temperature, the inlet tem-
perature is indicated on the second display line and flashes. The
water is not heated further.
4.8 Info menu
The appliance has an additional display where consumption values
can be shown.
4.8.1 Calling up the info menu
 Briefly press "i" until "i1" appears, then continue to press "i"
to see further menus.
 Exit the menu item by pressing "i" and holding for more than
5seconds. Alternatively: The system exits the menu item au-
tomatically 30seconds after the setting has been completed.
Menu Description Explanations Screen | display
I1 Flow rate The current flow rate
is shown.
Flow rate in l/min or
gpm
I2 Time The current time is
shown.
Time
I3 Energy consump-
tion
The amount of en-
ergy consumed is
shown.
Value in kWh
I4 Water consump-
tion
The amount of water
consumed is shown.
Value in m³ or gal
Note The consumption values are calculated starting from the
last reset.

OPERATION
Settings and displays
66 | DHE www.stiebel-eltron.com
4.9 Settings in the parameter menu
4.9.1 Activating the parameter menu
 Briefly press and hold "i" for more than 5seconds until "P1"
appears, then continue by briefly pressing "i".
 In the selected parameter menu, turn the temperature selec-
tor to the required display/ setting.
4.9.2 Parameter menu
Menu Description Selectable display |
setting
Explanations Symbol |
display
P1 ECO water and energy
saving function
OFF | ECO1 | ECO2 | ECO3 The ECO function enables you to limit the flow rate to a maximum
value.
Flow rate limit:
8l/min with "ECO1" | 7l/min with "ECO2" | 6l/min with "ECO3" |
No flow rate limit with "OFF".
|||
P2 Temperature limit Tmax OFF | 20.0 | 20.5 ...°C or
68 | 69 ...°F
The temperature limit allows you as a user to restrict the adjustable
set temperature at the appliance to a maximum value. Check that the
upper temperature limit has been correctly applied.
Your qualified contractor can set an additional temperature limit for
anti-scalding protection. This temperature then dictates the upper
limit of the setting range for the temperature limit function.

www.stiebel-eltron.com DHE | 67
OPERATION
Settings and displays
ENGLISH
Menu Description Selectable display |
setting
Explanations Symbol |
display
P3 Wellness showers OFF | Pro1 | Pro2 | Pro3|
Pro4
The Wellness shower program lets you choose from 4 different alter-
nating shower programs.
WW = domestic hot water, KW = cold water, min = minutes,
sec = seconds
- 1 Cold prevention
To strengthen the body, we recommend finishing off with a cold
shower; this will trigger a reflex in the body to warm up.
WW
KW
3 min
- 2 Winter refreshment
An invigorating end to a winter shower with a final warm-up.
WW
KW
3 min 10 sec
10 sec
10 sec
10 sec
WW - 10°C | 50°F
- 3 Summer fitness program
A quick contrast shower to increase fitness with a final warm-up.
WW
KW
3 min 10 sec
10 sec
10 sec
10 sec
- 4 Circulation boost program
Shower your arms and legs with cold water to boost circulation. Spray
from the hands and feet towards the body. You can then repeat this
process with hot water.
WW
KW
3 min 30 sec
20 sec
30 sec
20 sec

OPERATION
Settings and displays
68 | DHE www.stiebel-eltron.com
Menu Description Selectable display |
setting
Explanations Symbol |
display
P4 Automatic water volume
control – set the volume
in the selected unit
OFF | 5 | 10 | ... 200l or
2... 52gal
With the automatic water volume control, you can preselect a volume
of water, e.g. for filling a bathtub. When the preselected water volume
is reached, the automatic control reduces the flow rate. The automatic
water volume control must be enabled on each occasion prior to fill-
ing the bath.
Example, filling a bath with 80litres (21gallons): When the bath has
been filled with 80litres (21gallons), the control automatically reduc-
es the flow rate to 4l/min (1gpm).
P5 Temperature unit C | F Select the temperature unit for all settings. °C| °F
P6 Volume unit L | GAL Select the volume unit for all settings. l | gal
P7 Time format 24h | 12h Select time format.
P8 Time setting --:-- You can set the time using the 12 or 24hour clock:
- 12hours from 00:00 - 11:59= AM | 11:59 - 00:00= PM
- 24hours from 00:00 to 23:59
After a power cut, the time needs to be set again.
AM | PM (only
for 12h)
P9 Operating lock ON | OFF You can set the operating lock to "ON" or "OFF".
To disable the set operating lock:
Press and hold "i" for more than 12seconds.
(only when
ON)
P10 Reset to factory settings Reset ( ) You can restore the appliance to its factory settings. "rSEt" is shown
on the display.
Press "1" and "2" simultaneously and hold for longer than 5sec-
onds. The display switches to "On" to confirm the reset.
To confirm "On", press and hold "i" for more than 5seconds.
P11 Resetting the consump-
tion values
Reset ( | ) You can reset the consumption values. "rSEt" is shown on the display.
Press "1" and "2" simultaneously and hold for longer than 5sec-
onds. The display switches to "On" to confirm the reset.
To confirm "On", press and hold "i" for more than 5seconds.

www.stiebel-eltron.com DHE | 69
OPERATION
Settings and displays
ENGLISH
Menu Description Selectable display |
setting
Explanations Symbol |
display
P12 Backlighting Auto | On You can adjust the display backlight.
- If "Auto" is selected, the backlight is switched on during heating
operation and each time an action is performed. If no action is per-
formed for 30seconds, the backlight is switched off again.
- If you select "On", the backlight will remain on constantly.
P13 Reduce backlighting 100% | 20% ( ) You can select 2levels of brightness for the backlight.
P14 Wireless module After installation of a wireless module (with or without paired wire-
less remote control) in the appliance, menu item P14 is enabled and
"rc" appears on the programming unit display. You can pair one or
more wireless remote controls; to do so, follow the pairing procedure
on the appliance and the wireless remote control.
Pressing "1" on the appliance for longer than 5seconds starts the
pairing process, which is shown on the programming unit of the ap-
pliance by a progress bar on the display and the operating LED flash-
ing. Start the pairing process on the wireless remote control as de-
scribed in the relevant operating instructions. After successful pairing,
the operating LED on the appliance flashes briefly. An unsuccessful
pairing attempt is automatically terminated after 30seconds.
Pressing "2" on the appliance for longer than 5seconds unpairs all
connected wireless remote controls. During unpairing, "rc0" appears
on the display of the programming unit for 5seconds, then "rc" again.
4.9.3 Deactivating the parameter menu
 Exit the menu item by pressing "i" and holding for more than
5seconds. Alternatively: The system exits the menu item au-
tomatically 30seconds after the setting has been completed.

OPERATION
Cleaning, care and maintenance
70 | DHE www.stiebel-eltron.com
4.10 Recommended settings
Your instantaneous water heater offers maximum precision and
maximum convenience in DHW provision. Should you nonetheless
operate the appliance with a thermostatic valve, we recommend
that you:
 Adjust the set temperature on the appliance to over 50°C.
Then set the required set temperature on the thermostatic
valve.
Saving energy
The following recommended settings will result in the lowest en-
ergy consumption:
- 38°C for hand washbasins, showers, bath
- 55°C for kitchen sinks
Internal anti-scalding protection (qualified contractors)
If required, the qualified contractor can set a permanent temper-
ature limit, for example in nurseries, hospitals,etc.
Recommended setting for operation with a thermostatic valve
and water preheated by solar energy
 Set the temperature at the appliance to the maximum
temperature.
Following an interruption to the water supply
!Material losses
To ensure that the bare wire heating system is not dam-
aged following an interruption to the water supply, the
appliance must be recommissioned by taking the follow-
ing steps.
 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 on the power supply again.
5. Cleaning, care and maintenance
 Never use abrasive or corrosive cleaning agents. A damp
cloth is sufficient for cleaning the appliance.
 Check the taps regularly. Limescale deposits at the tap out-
lets can be removed using commercially available descaling
agents.

www.stiebel-eltron.com DHE | 71
OPERATION
Troubleshooting
ENGLISH
6. Troubleshooting
Problem Cause Remedy
The appliance will not
start despite the DHW
valve being fully open.
There is no power. Check the fuses/ MCBs in
your fuse box/ distribu-
tion board.
The aerator in the tap
or the shower head is
scaled up or dirty.
Clean and/or descale the
aerator or shower head.
The water supply has
been interrupted.
Vent the appliance and
the cold water inlet line.
When hot water is being
drawn off, cold water
flows for a short period.
The air sensor is detect-
ing air in the water. It
briefly switches off the
heating output.
The appliance restarts
automatically after
1minute.
The required tempera-
ture cannot be set.
The high limit safety
cut-out and/or internal
anti-scalding protection
are enabled.
Deactivate the temper-
ature limit. The internal
anti-scalding protection
can only be adjusted by
qualified contractors.
The flow rate is too low. ECO function is enabled. Select a different ECO
level or disable the ECO
function.
No settings can be made
on the programming
unit.
The operating lock is
enabled.
To deactivate the oper-
ating lock, press the "i"
button for more than
12seconds.
Note Programming unit displays and selected settings are re-
tained following a power failure.
If you cannot remedy the fault, contact your qualified contractor.
To facilitate and speed up your enquiry, please provide the serial
number from the type plate (000000-0000-000000).
Nr.000000-0000-00000
Nr. 000000-0000-00000
D0000053312

INSTALLATION
Safety
72 | DHE www.stiebel-eltron.com
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 maximum inlet temperature. Higher tem-
peratures may damage the appliance. You can limit
the maximum inlet temperature by installing a central
thermostatic valve (see chapter "Appliance description/
Accessories").
WARNING Electrocution This appliance contains capacitors which are discharged
when disconnected from the power supply. The capacitor
discharge voltage may briefly exceed60VDC.
7.2 Shower operation
CAUTION Burns  When supplying a shower, set the internal an-
ti-scalding protection to 55°C or less; see chapter
"Commissioning/ Preparations".
CAUTION Burns If operating with preheated water, e.g. if using a solar
thermal system, observe the following information:
-The DHW temperature may exceed the set tempera-
ture or a set temperature limit.
-The dynamic anti-scalding protection between the
appliance and a wireless remote control may not be
effective.
 In such cases, limit the temperature with an up-
stream central thermostatic valve (e.g. ZTA3/4).
7.3 Instructions, standards and regulations
Note Observe all applicable national and regional regulations
and instructions.
- The IP24/ IP25 protection rating can only be ensured with a
correctly fitted cable grommet.

www.stiebel-eltron.com DHE | 73
INSTALLATION
Appliance description
ENGLISH
- The electrical resistivity of the water must not fall below that
stated on the type plate. In a linked water network, take into
consideration the lowest electrical resistivity of the water.
Your water supply utility will advise you of the electrical re-
sistivity or conductivity of the water in your area.
8. Appliance description
8.1 Standard delivery
The following are delivered with the appliance:
- Wall mounting bracket
- Installation template
- 2 twin nipples
- 3-way ball shut-off valve for cold water
- Tee for domestic hot water
- Flat gaskets
- Strainer
- Plastic profile washer
- Plastic connection pieces/ installation aid
- Cover and back panel guides
- Jumper for internal anti-scalding protection
- Jumper for output changeover (only with DHE18/21/24)
8.2 Accessories
Wireless remote control
- FFB4SetEU
Fittings
- MEKD mono lever kitchen pressure tap
- MEBD mono lever bath pressure tap
Water plugs G½A
If you use taps other than the recommended pressure taps on
finished walls, please use the plugs.
Installation set for finished walls
- Solder fitting – copper pipe for soldered connection Ø12 mm
- Press fitting – copper pipe
- Press fitting – plastic pipe (suitable for Viega: Sanfix-Plus or
Sanfix-Fosta)
Universal mounting frame
- Mounting frame with electrical connections
Pipe assembly for undersink appliances
You will need the undersink installation set if you make the water
connections (G⅜A) at the top of the appliance.

INSTALLATION
Preparation
74 | DHE www.stiebel-eltron.com
Pipe assembly for offset installation
Use this pipe assembly if you intend to offset the appliance by up
to 90mm downwards from the water connection.
Pipe assembly for replacing a gas water heater
You will need this pipe assembly set if the existing installation
has gas water heater connections (cold water connection on the
left-hand side, DHW connection on the right-hand side).
Pipe assembly for DHB water plug-in couplings
Use the water plug-in couplings if the existing installation contains
water plug-in connections from a DHB water heater.
Load shedding relay (LR 1-A)
The load shedding relay for installation in the distribution board
provides priority control for the instantaneous water heater when
other appliances, suchas electric storage heaters, are being op-
erated simultaneously.
Central thermostatic valve (ZTA3/4)
Use the thermostatic valve for central premixing, for example
when operating an instantaneous water heater with preheated
water. For use in shower operation, the valve must be set to a
maximum of 55°C.
9. Preparation
9.1 Installation site
!Material losses
Install the appliance in a room that is free from the risk
of frost.
 Always install the appliance vertically and near the draw-off
point. For horizontal installation, see chapter "Installation
alternatives/ Horizontal installation of the appliance".
The appliance is suitable for undersink and oversink installation.
Undersink installation
D0000056242
1
2
1 Cold water inlet
2 DHW outlet