STIEBEL ELTRON DHE 18-27 SLi Operation Instruction

GEBRAUCHS- UND MONTAGEANLEITUNG

OPERATING AND INSTALLATION INSTRUCTIONS

INSTRUCTIONS D‘UTILISATION ET DE MONTAGE

GEBRUIKS- EN MONTAGEAANWIJZING

NÁVOD K POUŽÍVÁNÍ A MONTÁŽI

INSTRUKCJA OBSŁUGI I MONTAŻU

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

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www.stiebel-eltron.com DHE SLi | 23

ENGLISH

CONTENTS | SPECIAL INFORMATION

SPECIAL INFORMATION

- The appliance may be used by children aged3

and older and persons with reduced physical,

sensory or mental capabilities or a lack of ex-

perience and know-how, 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. Children must

never clean the appliance or perform user

maintenance unless they are supervised.

- The tap can reach temperatures of up to

65°C. There is a risk of scalding at outlet tem-

peratures 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,

it must be ensured that the inlet temperature

does not exceed 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.

- 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").

SPECIAL INFORMATION

OPERATION

1. General information �� 24

1.1 Safety instructions �� 24

1.2 Other symbols in this documentation �� 25

1.3 Units of measurement �� 25

2. Safety �� 25

2.1 Intended use �� 25

2.2 General safety instructions �� 25

2.3 Test symbols �� 25

3. Appliance description �� 25

4. Settings and displays �� 26

4.1 Recommended settings �� 26

4.2 User interface on the appliance��26

4.3 Setting the temperature ��27

4.4 Economy monitor selection �� 27

4.5 Appliance settings �� 27

5. Cleaning, care and maintenance �� 29

6. Troubleshooting �� 29

INSTALLATION

7. Safety �� 30

7.1 General safety instructions ��30

7.2 Shower operation��30

7.3 Instructions, standards and regulations ��30

8. Appliance description �� 30

8.1 Standard delivery ��30

8.2 Accessories ��30

9. Preparation �� 31

9.1 Installation location �� 31

9.2 Factory settings �� 32

10. Installation �� 32

10.1 Completing the installation �� 34

10.2 Alternative installation methods��34

11. Commissioning �� 37

11.1 Initial start-up �� 37

11.2 Recommissioning �� 37

12. Service mode �� 37

13. Appliance shutdown �� 38

14. Troubleshooting �� 39

15. Maintenance �� 40

16. Speciﬁcation �� 40

16.1 Dimensions and connections �� 40

16.2 Wiring diagram �� 41

16.3 DHW output �� 41

16.4 Application areas/ Conversion table �� 42

16.5 Pressure drop �� 42

16.6 Fault conditions �� 42

16.7 Energy consumption data �� 42

16.8 Data table �� 43

GUARANTEE

ENVIRONMENT AND RECYCLING

OPERATION

General information

24 |DHE SLi www.stiebel-eltron.com

- Drain the appliance as described in chapter

"Installation/ Maintenance/ Draining the

appliance".

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

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.

OPERATION

Safety

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ENGLISH

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 adjacent

symbol.

 Read these texts carefully.

Symbol

!

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

Unless speciﬁed otherwise, all dimensions are given in

mm.

2. Safety

2.1 Intended use

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.

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

The tap can reach temperatures of up to 65°C. There is a

risk of scalding at outlet temperatures in excess of 43°C.

!

WARNING Injury

The appliance may be used by children aged3 and older

and persons with reduced physical, sensory or mental

capabilities or a lack of experience and know-how, pro-

vided that they are supervised or they have been in-

structed on how to use the appliance safely and have

understood the potential risks. Children must never play

with the appliance. Children must never clean the ap-

pliance 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

qualiﬁed contractor:

- Childprooﬁng adjustable by the user

- Anti-scalding protection adjustable by the qualiﬁed

contractor

!

Material losses

The user should protect the appliance and its tap against

frost.

2.3 Test symbols

See type plate on the appliance.

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 cas-

ing. The heating system is suitable for hard and soft water areas

and is largely insusceptible to scale build-up. This heating 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.

OPERATION

Settings and displays

26 |DHE SLi www.stiebel-eltron.com

Economy monitor

The appliance has an economy monitor. This is activated by press-

ing the appropriate key. Advertisements:

- Energy savings*

- Water savings*

- CO

2

savings*

- 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.

Inlet temperature information

If the inlet temperature is higher than the required 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

4.1 Recommended settings

Your instantaneous water heater offers maximum precision and

maximum convenience in DHW provision. Should you nonetheless

be operating the appliance with a thermostatic valve, we recom-

mend 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.

When supplying a shower, the appliance temperature setting

range must be adjusted by the qualiﬁed contractor to 55°C or less.

Limiting it in this way prevents water from ﬂowing out of the

appliance at temperatures which could cause injury.

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 restarted by taking the following 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 the power back ON.

4.2 User interface on the appliance

D0000033114

1

2

3

4

5

6

9

7

8

10

1 Temperature selector

2 Scalding risk LED

3 Memory key

4 Menu button

5 Additional value display

6 Heating output display

7 Temperature display

8 Service symbol

9 Fault symbol

10 Economy monitor information key

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,

OPERATION

Settings and displays

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ENGLISH

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 Wellness shower programs

2 Automatic water volume control

3 ECO

4 Childprooﬁng

5 Additional value display

6 Time

4.3 Setting the temperature

26�02�02�1321�

32

1

1 Temperature setting 20 - 60°C in steps of 0.5°C,

OFF = heating system switched off

2 Programmed temperature selection

3 Economy monitor selection

You can store the required temperature with memory key M.

 Select the required temperature.

 Press the M key for 2 seconds. The temperature display ﬂash-

es once to conﬁrm.

4.4 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.

4.5 Appliance settings

Key to symbols

Press once START menu

Press once Change menu

Hold for 2seconds END

Change settings/ scanning

OPERATION

Settings and displays

28 |DHE SLi www.stiebel-eltron.com

Menu structure

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

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 temper-

ature at the appliance to a maximum value. In service mode, your

qualiﬁed contractor can also set a temperature for anti-scalding

protection (see chapter "Service mode"). This temperature then

acts as the upper limit of the setting range for childprooﬁng.

3 Wellness shower programs

The Wellness shower program lets you choose from 4 different

alternating 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

3 min

10 sec

C Summer ﬁtness program

The quick contrast shower to increase ﬁtness with a ﬁnal

warm-up.

WW

KW

3 min

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 hot water.

WW

KW

3 min

20 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

required 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.

OPERATION

Cleaning, care and maintenance

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ENGLISH

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 regularly. Limescale deposits at the tap out-

lets can be removed using commercially available descaling

agents.

6. Troubleshooting

Fault Cause Remedy

The appliance will not

start despite the DHW

valve being fully open.

There is no power sup-

ply.

Check the fuse/MCB in

your fuse box/distribu-

tion panel.

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

(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

cannot be set.

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 qualiﬁed 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�

INSTALLATION

Safety

30 |DHE SLi 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 the 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 reach >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

"Customer service/ Setting the anti-scalding pro-

tection".

CAUTION Burns

If the water supplied to the appliance is preheated,

please note the following points:

- The internally adjustable anti-scalding protection

and the temperature limit that is adjustable by the

user may be exceeded.

- The dynamic anti-scalding protection between the

appliance and the wireless remote control may not

be effective.

 In both cases, limit the temperature with an up-

stream central thermostatic valve (ZTA 3/4).

7.3 Instructions, standards and regulations

Note

Observe all applicable national and regional regulations

and instructions.

- The IP 25 (hoseproof) rating can only be ensured with a cor-

rectly ﬁtted cable grommet.

- The speciﬁc electrical resistivity 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 sup-

ply utility will advise you of the speciﬁc electrical water resis-

tivity or conductivity.

8. Appliance description

8.1 Standard delivery

The following are 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

- MEKD - kitchen pressure tap

- MEBD - bath pressure tap

Plugs G½A

The plugs are required if you use any taps other than the pressure

taps for ﬁnished walls 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.

INSTALLATION

Preparation

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ENGLISH

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 for DHB water plug-in couplings

2 water plug-in couplings for connecting the appliance to the ex-

isting water plug-in connections of a DHB.

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 when operating

an instantaneous water heater with preheated water, for example.

For use in shower operation, the valve must be set to a maximum

of 55°C.

9. Preparation

 Flush the water line thoroughly.

Taps

 Use suitable taps (see chapter "Appliance description/ Acces-

sories"). Open vented taps are not permissible.

No safety valve is required.

Note

Never use the cross-piece to reduce the ﬂow rate. It is

intended for shutting off the appliance.

Permissible water line materials

- Cold water inlet pipe:

Pipes made from galvanised steel, stainless steel, copper or

plastic

- DHW outlet line:

Pipes made from stainless steel, copper or plastic

!

Material losses

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 for switching on the appliance is

achieved (see chapter "Speciﬁcation/ Data table", On).

 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 with an additional screw at the

bottom.

9.1 Installation location

!

Material losses

Install the appliance in a room free from the risk of frost.

 Always install the appliance vertically and 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

2

1

1 Cold water inlet

2 DHW outlet

INSTALLATION

Installation

32 |DHE SLi www.stiebel-eltron.com

9.2 Factory settings

The appliances are delivered pre-prepared:

- Electrical connection from below, installation on unﬁnished

walls

- Water connection on unﬁnished walls

- For the appliance with adjustable connected load, the middle

load is preset.

10. Installation

This chapter describes installation in accordance with the factory

settings.

For further installation options, see chapter "Alternative instal-

lation methods".

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 forwards.

D0000059694

 Mark out the holes for drilling using the installation tem-

plate. If the appliance is to be installed with water connec-

tions on ﬁnished walls, also mark out the ﬁxing hole in the

lower section 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

connections, also 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 losses

Carry out all water connection and installation work in

accordance with regulations.

12

D0000053319

 Seal and insert the twin connectors.

5 Nm

24

D0000059695

1

45

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 losses

The strainer must be ﬁtted for the appliance to function.

 When replacing the appliance, check that the strain-

er is present.

INSTALLATION

Installation

www.stiebel-eltron.com DHE SLi | 33

ENGLISH

Installing the appliance

18

21

24

kW

26�02�02�0934�

 For easier installation, push the cable grommet of the upper

electrical connection into the back panel from behind.

 Remove the protective 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.

If the cross-section is >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°.

24

19

3 Nm

5 Nm

D0000056244

 Fit the pipes with ﬂat gaskets onto the twin connectors.

Making the electrical connection

WARNING Electrocution

Carry out all electrical connection and installation work

in accordance with relevant regulations.

WARNING Electrocution

The connection to the power supply must be in the form

of a permanent connection in conjunction with the re-

movable cable grommet. Ensure the appliance can be

separated from the power supply by an isolator that dis-

connects 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.

Adjustable connected load

Up to 3 connected load stages can be selected, subject to appliance

type. 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. Use

a ballpoint pen to do this.

INSTALLATION

Installation

34 |DHE SLi www.stiebel-eltron.com

10.1 Completing the installation

26�02�02�1102�

 Fit the lower part of the back panel. Ensure the lower back

panel clicks into place.

 Align the mounted appliance by undoing 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

- Electrical connection from above on unﬁnished walls

- Electrical connection on ﬁnished walls

- Large conductor cross-section for electrical connection from

below

- Connecting a load shedding relay

- Water installation on ﬁnished walls

- Water installation for ﬁnished walls with solder/ compres-

sion ﬁtting

- Water installation on ﬁnished walls; ﬁtting the appliance

cover

- Fitting the base part of the back panel with threaded ﬁttings

on ﬁnished walls

- Use of existing mounting bracket when replacing an

appliance

- Installation with offset tiles

- Pivoting appliance cover

- Operation with preheated water

Electrical connection from above on unﬁnished walls

26�02�02�1123�

 Cut open 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 under 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 IP rating of the ap-

pliance.

 Change the type plate. Cross out "IP 25" and mark

the box "IP 24". Use a ballpoint pen to do this.

Large conductor cross-section for electrical connection 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 out

the cable grommet.

INSTALLATION

Installation

www.stiebel-eltron.com DHE SLi | 35

ENGLISH

 Slide the cable grommet over the power cable. For this, use

the installation aid. If the cross-section is >6mm², enlarge

the hole in the cable grommet.

 Push the cable grommet into the back panel.

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 losses

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 on ﬁnished walls

Suitable pressure-tested taps can be ordered as accessories.

19

24

5 Nm

18 Nm

D0000033104

1 Water plug

2 Pressure tap for ﬁnished walls

 Fit the water plugs with gaskets to seal the in-wall connec-

tion. All pressure taps listed in the accessories are supplied

with plugs and gaskets as 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

With the solder ﬁtting or compression ﬁtting accessories you can

connect both copper and plastic pipes.

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.

 Slide the lower back panel under the connection pipes of the

tap and click the lower back panel into place.

 Secure the connection pipes to the appliance.

Note

Observe the tap manufacturer's instructions.

Water installation on ﬁnished walls; ﬁtting the appliance cover

D0000041391

4

3

2

1

1 Back panel guides

2 Screw

3 Cover guides

4 Pipe knock-out

 Cleanly break out the knock-out apertures 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 openings.

 Position the back panel guides on the pipes and push them

together. Then push the guides against the back panel as far

they will go.

 Secure the back panel at the bottom with a screw.

Fitting the base part of the back panel with threaded ﬁttings

on ﬁnished walls

You can install the lower back panel after ﬁtting the taps.

1

2

26�02�02�1080

1 Screw

2 Connection pieces delivered in the pack

 Cut open the lower back panel at the markings.

 Fit the lower back panel by bending it out at the sides and

guiding it over the pipes.

 Insert the connection pieces into the lower back panel from

behind.

 Click the lower back panel into place.

 Secure the lower back panel with a screw.

INSTALLATION

Installation

36 |DHE SLi www.stiebel-eltron.com

Wall mounting bracket when replacing an appliance

An existing STIEBELELTRON wall mounting bracket may be used

when replacing appliances (except the DHF instantaneous water

heater), as long as the ﬁxing screw is in the lower right position.

Replacing a DHF instantaneous water heater

26�02�02�0815�

 Reposition the ﬁxing screw on the wall mounting bracket (the

ﬁxing screw has a self-tapping thread).

 Rotate the wall mounting bracket 180° and mount it on the

wall (the DHF logo is then turned towards you).

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°.

Pivoting appliance cover

The appliance cover can be turned for undersink installation.

electr onic

comfor t

electr

onic comf or

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/ Initial start-up").

 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 is ﬁrmly seated

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").

INSTALLATION

Commissioning

www.stiebel-eltron.com DHE SLi | 37

ENGLISH

11. Commissioning

WARNING Electrocution

Commissioning must only be carried out by a qualiﬁed

contractor in accordance with safety regulations.

11.1 Initial start-up

 Open the cross-piece.

on

26�02�02�0554

 Open and close all connected draw-off valves several times,

until all air has been purged from the pipework and the

appliance.

 Carry out a tightness check.

 Activate the safety switch (AE 3) by ﬁrmly pressing 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 cover and secure it with a screw.

 Switch the power supply ON.

 Check the appliance function.

 Remove the protective foil from the control fascia.

Appliance handover

 Explain the appliance function to users and familiarise them

with how it works.

 Make the user aware of potential dangers, especially the risk

of scalding.

 Hand over these instructions.

11.2 Recommissioning

!

Material losses

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

D0000046159

 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).

INSTALLATION

Appliance shutdown

38 |DHE SLi www.stiebel-eltron.com

Scanning the error menu

The error menu only appears if the appliance has a fault.

D0000046156

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 this anti-scalding protection for use with a shower or in plac-

es such as nurseries and hospitals. The temperature set here is

also the upper limit for the childprooﬁng temperature setting (see

chapter "Appliance settings").

26�02�02�1301�

Setting Description

21 - 60°C Setting range

43 Forexample in nurseries, hospitals, etc.

55 Max. for shower operation

60 Factory setting

No jumper Limited to 43°C

CAUTION Burns

If the water supplied to the appliance is preheated, the

internal anti-scalding protection and the temperature

limit that is adjustable by the user may be exceeded.

In such cases, limit the temperature with an upstream

central thermostatic valve (ZTA 3/4).

Note

The anti-scalding protection setting can only be modiﬁed

by a qualiﬁed contractor. Simultaneously pressing the M

+ i key will not change the setting.

13. Appliance shutdown

 Isolate all poles of the appliance from the power supply.

 Drain the appliance (see chapter "Maintenance").

INSTALLATION

Troubleshooting

www.stiebel-eltron.com DHE SLi | 39

ENGLISH

14. Troubleshooting

WARNING Electrocution

In order to check the appliance it must be connected to

the power supply.

Push-ﬁt connections on the PCB

26�02�02�1343

1

5

6

7

2

3

4

1 Diagnostic trafﬁc light (3 LEDs)

2 Flow sensor DFE

3 Motorised valve

4 High limit safety cut-out STB

5 Outlet sensor NTC

6 Set value transducer

7 Safety switch AE 3; plug-in connection secured with locking

tab.

Indicator options for diagnostic traffic light (LED)

Red Illuminates in the event of a fault

Yellow Illuminates during heating operation

Green Flashing: Appliance connected to power supply

Fault Cause Diagnostic traf-

fic light

Remedy

The appliance does

not heat up/ the set

temperature is not

reached.

There is no power supply.

No LED illuminates

Check the MCB/fuse in your fuse box/distribution panel.

The safety switch (AE3) has

responded.

No LED illuminates

Remove the cause of the fault.

Protect the heating system against overheating by opening a draw-off valve down-

stream of the appliance for one minute. Activate the safety switch by pressing the

pushbutton on the safety switch (see also chapter "Commissioning/ Initial start-

up").

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/distribution panel.

The inlet temperature is

>55°C.

Flashing green LED,

red LED on

Limit the inlet temperature.

The flow sensor (DFE) is faulty

or not attached.

Flashing green LED,

yellow LED off

Check the connection of the flow sensor and replace if necessary.

The heating system is faulty. Flashing green LED,

yellow LED on

Check the heating system and replace if necessary.

The inlet sensor is faulty. Flashing green LED,

red LED on

Replace the PCB.

The outlet sensor is faulty. Flashing green LED,

red LED on

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 flashing

Connect the connecting cable from the set value transducer and check the connect-

ing cable.

INSTALLATION

Maintenance

40 |DHE SLi www.stiebel-eltron.com

Fault Cause Diagnostic traf-

fic light

Remedy

The set value transducer is

faulty.

Green LED flashing Check the set value transducer and replace it if required.

Childproofing and/or tempera-

ture limiting is activated.

Green LED flashing Disable temperature limiting.

The display on the

appliance is complete-

ly off.

A loose connecting cable to the

set value transducer.

Green LED flashing

Connect the connecting cable at the set value transducer and check the connecting

cable.

The programming PCB is faulty. Green LED flashing Check the programming unit and replace if necessary.

The flow rate is too

low.

The shower head/aerator are

scaled up.

Descale or if necessary replace the shower head/ aerators.

The strainer is soiled. Clean the strainer.

The set value cannot

be adjusted higher

than 43°C, nor can a

different set tempera-

ture be selected.

Dynamic anti-scalding protec-

tion is activated.

Green LED flashing

The dynamic anti-scalding protection is deactivated again 2 minutes after draw-off.

Cold water flows brief-

ly 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 de-

tected.

The air sensor detects the

presence of air in the water and

briefly switches the heater off.

The appliance restarts after one minute.

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 inlet 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

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

INSTALLATION



www.stiebel-eltron.com DHE SLi | 41

ENGLISH

Alternative connection options

165

50

30

35

72

325

330

20

b03

b02

b04

D0000059268

b02 Entry electrical cables I

b03 Entry electrical cables II

b04 Entry electrical cables III

16.2 Wiring diagram

3/PE ~ 380-415 V

L

2

III1

L2`

L3`L1`

3/4

1

3

4

2

I

II

U

F

L L

85�02�02�0004�

1

3

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".

85�02�02�0003�

2

1

1 Control cable to the contactor of the 2nd appliance (e.g. elec-

tric storage heater).

2 Control contact drops out when switching the instantaneous

water heater on.

16.3 DHW output

The DHW output is subject to the connected power supply, the

appliance's connected load and the cold water inlet temperature.

The rated voltage and rated output can be found on the type plate.

Connected load in kW 

Rated voltage Cold water inlet temperature

380 V      

16.2 7.0 8.3 10.1 12.9

19 8.2 9.7 11.8 15.1

21.7 9.4 11.1 13.5 17.2

18 7.8 9.2 11.2 14.3

21 9.1 10.7 13.0 16.7

24 10.4 12.2 14.9 19.0

19.4 8.4 9.9 12.0 15.4

22.6 9.8 11.5 14.0 17.9

25.8 11.2 13.2 16.0 20.5

24.4 10.6 12.4 15.2 19.4

27 11.7 13.8 16.8 21.4

29.1 12.6 14.8 18.1 23.1

Connected load in kW 

Rated voltage Cold water inlet temperature

380 V      

16.2 5.1 5.8 6.6 7.7

19 6.0 6.8 7.8 9.0

21.7 6.9 7.8 8.9 10.3

18 5.7 6.4 7.3 8.6

21 6.7 7.5 8.6 10.0

24 7.6 8.6 9.8 11.4

19.4 6.2 6.9 7.9 9.2

22.6 7.2 8.1 9.2 10.8

25.8 8.2 9.2 10.5 12.3

24.4 7.7 8.7 10.0 11.6

27 8.6 9.6 11.0 12.9

29.1 9.2 10.4 11.9 13.9

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STIEBEL ELTRON DHE 18-27 SLi Operation Instruction

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