STIEBEL ELTRON DHB 21 si Instructions for Use and Installation

Brand: STIEBEL ELTRON

Model: DHB 21 si

Type: Instructions for Use and Installation

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Tabla de materias

Español Castellano Páginas 26 - 30

1. Instrucciones de uso . . . . . . . . . . . . . . . . 26

Descripción del aparato . . . . . . . . . . . . . . . . . . 26

Lo más importante en pocas palabras . . . . . . 26

Manejo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Guía rápida para resolver problemas . . . . . . . 26

Ajustes recomendados . . . . . . . . . . . . . . . . . . . 26

Observaciones importantes . . . . . . . . . . . . . . . 26

2. Instrucciones de montaje . . . . . . . . .27 - 29

Construcción del aparato . . . . . . . . . . . . . . . . . 27

Accesorios especiales . . . . . . . . . . . . . . . . . . . . 27

Observaciones importantes . . . . . . . . . . . . . . . 27

Descripción abreviada . . . . . . . . . . . . . . . . . . . . 27

Normas y reglamentos . . . . . . . . . . . . . . . . . . . 27

Datos técnicos . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Emplazamiento de montaje . . . . . . . . . . . . . . . 28

Conexión hidráulica . . . . . . . . . . . . . . . . . . . . . . 28

Conexión eléctrica . . . . . . . . . . . . . . . . . . . . . . . 28

Primera puesta en marcha . . . . . . . . . . . . . . . . 29

Accesorios especiales . . . . . . . . . . . . . . . . . . . . 29

3. Garantía . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4. Medio ambiente y reciclado . . . . . . . . . . 29

5. Indicaciones para el servicio técnico -

Instalador . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

6. Resolución de incidencias - usuario . . . . 30

7. Resolución de incidencias - instalador . . 30

Inhoudsoverzicht

Nederlands pagina . 21 - 25

1. Gebruiksaanwijzing . . . . . . . . . . . . . . . . . 21

Beschrijving van het toestel . . . . . . . . . . . . . . . 21

Het belangrijkste in het kort . . . . . . . . . . . . . . . 21

Bediening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Eerste hulp bij storingen . . . . . . . . . . . . . . . . . . 21

Aanbevolen instellingen . . . . . . . . . . . . . . . . . . 21

Belangrijke aanwijzingen . . . . . . . . . . . . . . . . . . 21

2. Montagehandleiding . . . . . . . . . . . . . .22 - 24

Opbouw van het toestel . . . . . . . . . . . . . . . . . . 22

Speciale armaturen . . . . . . . . . . . . . . . . . . . . . . 22

Belangrijke aanwijzingen . . . . . . . . . . . . . . . . . . 22

Beknopte beschrijving . . . . . . . . . . . . . . . . . . . . 22

Voorschriften en bepalingen . . . . . . . . . . . . . . 22

Technische gegevens . . . . . . . . . . . . . . . . . . . . . 23

Plaats van montage . . . . . . . . . . . . . . . . . . . . . . 23

Wateraansluiting . . . . . . . . . . . . . . . . . . . . . . . . . 23

Elektrische aansluiting . . . . . . . . . . . . . . . . . . . . 23

Eerste ingebruikneming . . . . . . . . . . . . . . . . . . . 24

Extra toebehoren . . . . . . . . . . . . . . . . . . . . . . . . 24

3. Garantie . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4. Milieu en recycling . . . . . . . . . . . . . . . . . . 24

5. Serviceaanwijzingen voor de installateur 24

6. Het opheffen van storingen door

de gebruiker . . . . . . . . . . . . . . . . . . . . . . . . . 25

7. Het opheffen van storingen door

de installateur . . . . . . . . . . . . . . . . . . . . . . . . 25



  

  

  

  

  

!"  

#  

$  

%&  '()

*  '

+&,  '

,, '

+#-  '

&,,  '

."/  0

1&  0

,  0

2  0

344  )

3#&,  )

56,  )

7+,,89  )

 $"8  5:

' $"89  5:

Table des matières

Français page . . . . . 16 - 20

1. Instructions d’utilisation . . . . . . . . . . . . . 16

Description de l’appareil . . . . . . . . . . . . . . . . . 16

Sommaire des informations essentielles . . . . 16

Fonctionnement . . . . . . . . . . . . . . . . . . . . . . . . 16

Conseils en cas de dysfonctionnements . . . 16

Conseils de réglage . . . . . . . . . . . . . . . . . . . . . 16

Observations importantes . . . . . . . . . . . . . . . 16

2. Instructions de montage . . . . . . . . . 17 - 19

Composition de l’appareil . . . . . . . . . . . . . . . . 17

Robinetteries spécifiques . . . . . . . . . . . . . . . . 17

Observations importantes . . . . . . . . . . . . . . . 17

Description, caractéristiques techniques . . . 17

Normes et spécifications . . . . . . . . . . . . . . . . 17

Informations techniques . . . . . . . . . . . . . . . . . 18

Emplacement de montage . . . . . . . . . . . . . . . 18

Raccordement hydraulique . . . . . . . . . . . . . . 18

Raccordement électrique . . . . . . . . . . . . . . . . 18

Première mise en service . . . . . . . . . . . . . . . . 18

Accessoires spécifiques . . . . . . . . . . . . . . . . . . 18

3. Garantie . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4. Environnement et recyclage . . . . . . . . . . . 19

5. Instructions de service, installateur

professionnel . . . . . . . . . . . . . . . . . . . . . . . . . 19

6. Dépannage, par l’utilisateur . . . . . . . . . . . . 20

7. Dépannage, par l’installateur professionnel 20



  

;9<=  

*>?  

+>@A,"B&  

9<=  

@&@,@  

3@  

CA@>@  

%;&A  %(5

D@?  %

+&  %

CA@>@  %

+>@A,"B&  %

,&,  %

"  

1&A  

,<?@,  

,<?,  

@"&  5

E  5

F@  5

5G@,=  5

7,,,@H@(

A,@  7

,,,@H@( 7

Inhaltsverzeichnis

Deutsch Seite . . . . . . 6 - 10

1. Gebrauchsanweisung . . . . . . . . . . . . . . . . . 6

Gerätebeschreibung . . . . . . . . . . . . . . . . . . . . . . 6

Das Wichtigste in Kürze . . . . . . . . . . . . . . . . . . . 6

Bedienung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Erste Hilfe bei Störungen . . . . . . . . . . . . . . . . . . 6

Einstellungsempfehlung . . . . . . . . . . . . . . . . . . . . 6

Wichtige Hinweise . . . . . . . . . . . . . . . . . . . . . . . . 6

2. Montageanweisung . . . . . . . . . . . . . . . . .7 - 9

Geräteaufbau . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Spezialarmaturen . . . . . . . . . . . . . . . . . . . . . . . . . 7

Wichtige Hinweise . . . . . . . . . . . . . . . . . . . . . . . . 7

Kurzbeschreibung . . . . . . . . . . . . . . . . . . . . . . . . . 7

Vorschriften und Bestimmungen . . . . . . . . . . . . 7

Technische Daten . . . . . . . . . . . . . . . . . . . . . . . . . 8

Montageort . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Wasseranschluß . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Elektroanschluß . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Erstinbetriebnahme . . . . . . . . . . . . . . . . . . . . . . . 9

Sonderzubehör . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3. Garantie . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4. Umwelt und Recycling . . . . . . . . . . . . . . . . 9

5. Servicehinweise - Fachmann . . . . . . . . . . . 9

6. Störungsbeseitigung - Benutzer . . . . . . . 10

7. Störungsbeseitigung - Fachmann . . . . . . . 10

Contents

English page . . . . . . 11 - 15

1. Operating instructions . . . . . . . . . . . . . . 11

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Important information - in brief . . . . . . . . . . . 11

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Trouble-shooting in the event of problems 11

Recommended settings . . . . . . . . . . . . . . . . . . 11

Important information . . . . . . . . . . . . . . . . . . . 11

2. Installation instructions . . . . . . . . . . . 12- 14

Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Special fittings . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Important instructions . . . . . . . . . . . . . . . . . . . 12

Short description . . . . . . . . . . . . . . . . . . . . . . . 12

Regulations and specifications . . . . . . . . . . . . 12

Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Place of installation . . . . . . . . . . . . . . . . . . . . . 13

Water connection . . . . . . . . . . . . . . . . . . . . . . 13

Electrical connection . . . . . . . . . . . . . . . . . . . . 13

Initial operation . . . . . . . . . . . . . . . . . . . . . . . . . 14

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3. Guarantee . . . . . . . . . . . . . . . . . . . . . . . . 14

4. Environment and recycling . . . . . . . . . . . 14

5. Servicing instructions - qualified installer 14

6. Fault-finding - user . . . . . . . . . . . . . . . . . . 15

7. Fault-finding - qualified installer . . . . . . . 15



  

  

  

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  

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!"  

#  #$

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%&!!  #

!"  #

  #

'  #

()*)  +

,  +

'-*!  +

.*-*  +

-  

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+0  

-/

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42

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DeutschEnglish

1. Operating instructions for the user and the qualified installer

Description

The DHB hydraulically-controlled

instantaneous water heater heats the water

when the required volume of water flows

through the device.

Important information - in

brief

Power selector switch

➠ To change the heating output to the

required level.

Shower comfort switch

➠ For even more comfort when

showering.

Operation

Power selector switch

●●● Full output

➠ Automatic output modulation in 2 stages,

depending on the water volume, greatest

temperature increase,

or full load.

●● Energy saving

➠ Automatic output modulation in 2 stages,

energy saving with

heating load

(summer operation).

● Half load

➠ Fine adjustment to max.

heating load,

full heating capacity blocked (constant low

water requirement).

Shower comfort switch

Variable setting

➠ Fine adjustment of water volume and

temperature when showering, with hot

water tap fully opened.

Latching position

➠ For high temperatures, or with low

pressure in the hot water system.

Trouble-shooting in the

event of problems

 Set the output selector switch to the

basic setting ●●●.

 Set the shower comfort switch to the

basic position

 Check fuses.

 Check the fittings and shower head for

lime scale or dirt.

See page 15 for more fault-finding

information.

Recommended settings

 for supplying bathroom and

kitchen:

Power selector switch:

➠ Position ●●●

Shower comfort switch:

➠ Latching position

➠ The desired temperature is adjusted at

the fitting.

 For suppling bathroom only:

Power selector switch:

➠ Filling bath, position ●●●.

➠ Showering in summer, position ●●.

Shower comfort switch:

➠ Hot water valve fully open.

➠ With sufficient pressure in the water

system, adjust the shower temperature

with the shower comfort switch

 Operation with two-handle fitting/

mono-bloc mixer

The DHB automatically controls the

individual heat output depending on the

water flow rate (Stages  and ) through the

device. To do this, a minimum volume is

required for actuation (see “Technical

Data”).

Sink:

➠ Open the hot water tap of the two-

handle fitting or set the mono-bloc mixer

to the Hot setting. With a low flow

volume, the device will switch on heating

stage . By reducing the flow at the hot

water tap, the output temperature can

be increased, and reduced by opening

the tap further.

Shower/bath/basin:

➠ With the hot water tap fully open/mono-

bloc mixer at the hot setting, the device

will operate automatically in Stage . The

output temperature and hot water

volume can be changed by means of the

shower comfort switch

or by mixing

in cold water at the fitting.

 Operation with thermostatic fitting:

Shower comfort switch:

➠ Always in the latching position

Power selector switch:

➠ Position ●●● or ●●

Take note of the instructions provided by the

manufacturer of the fitting.

➠ The desired temperature at other tap

points is adjusted at the fitting.

 With low pressure in the water system,

the shower comfort switch is to be set to

the latching position

The pressure loss in the downstream

fitting and in the hand-held shower in

particular, influences the temperature

selection possibility at the shower comfort

switch. Use hand-held showers with low

pressure loss (see page 14 for Relexa

hand-held shower).

Energy saving tip

The position ●● saves energy and

water when showering, especially

in Summer. For filling the bath, the

power stage ●●● is

recommended (shorter filling time).

Table 1

Maintenance

Maintenance work may only be

carried out by a qualified installer. An

overview of faults which you can rectify

yourself is provided on page 15.

Care

A damp cloth is all that is needed to care for

the housing. Do not use any abrasive or

aggressive cleaning agents.

Instructions for use and installation

Keep these instructions in a safe

place, and give them to the new

owner if you move house; if maintenance

or repair work is required, let the qualified

installer have them for reference.

Important information

When selecting the temperature at

the draw-off fitting, water

temperatures of over 60 °C may be

reached. For this reason, children should

be kept away from the fitting, due to the

risk of scalding.

Air in the cold water pipe will destroy the

bare-wire heating system of the DHB. If

the water supply to the DHB has been

interrupted, for example due to the risk of

frost or work on the water pipe, the

following steps must be carried out before

the system is used again:

1. Disconnect the supply or disconnect the

fuses.

2. Open a hot water tap downstream of

the device for as long as is necessary for

the device and the cold water pipe to be

freed of air.

3. Reconnect the supply or connect the

fuses again.

Hot water output

Depending on the time of year, a variety of

cold water supply temperatures can be

obtained which in turn give the following

maximum flow volumes or mixed water

volumes (see table 1).



= Cold water inlet temperature



= Mixing water temperature.



= Outlet temperature.

Useful temperatures:

– Approx. 38 °C: E.g. for shower, hand was-

hing, bath filling, etc.

– Approx. 60 °C: For kitchen washing and

when using thermostat fittings (shower

comfort switch in latching position



= 38 °C (Mixing water temperature)

kW 11,1 18 21 24 27



l/min

6 °C 4,9 8,0 9,4 10,7 12,1

10 °C 5,7 9,2 10,7 12,3 13,8

14 °C 6,6 10,7 12,5 14,3 16,1



= 60 °C (Outlet temperature)

kW 11,1 18 21 24 27



l/min

6 °C 2,9 4,8 5,6 6,4 7,2

10 °C 3,1 5,2 6,0 6,9 7,7

14 °C 3,5 5,6 6,5 7,5 8,4

Thermostat fitting:

See page 11 for instructions.

Important information

Air in the cold water pipe will

destroy the bare-wire heating system

of the DHB. If the water supply to the

DHB has been interrupted, for example

due to the risk of frost or work on the

water pipe, the following steps must be

carried out before the system is used again:

1. Disconnect supply or disconnect the

fuses.

2. Open a hot water tap downstream of

the device for as long as is necessary

for the device and the cold water pipe

to be freed of air.

3. Reconnect the supply or connect the

fuses again.

– The device is suitable for hot water

production (potable supply), and is to

be installed in enclosed, frost-free

rooms, as close as possible to the

outlet point (uninstalled devices are to

be stored in a frost-free place, because

there will always be residual water left

in the unit).

– All information in these Instructions for

Use and Installation must be followed

carefully. They provide important

information with regard to safety,

operation, installation, and maintenance

of the device.

Short description

The Stiebel Eltron DHB instantaneous water

heater is a hydraulically-controlled pressure

device for heating cold water in accordance

with DIN 1988, with which one or more

outlet points can be supplied.

The flow regulator (MRS), which can be

adjusted by means of the shower comfort

switch:

– keeps the flow volume constant in the

event of pressure fluctuations in the

water mains, and therefore keeps the

output temperature constant;

– limits the flow volume (latching position)

and therefore guarantees, even in winter,

an adequate temperature increase.

The integrated installation pressure switch

(15) allows for installation with DVGW-

tested plastic pipes. In the event of a fault,

the integrated installation pressure switch

with the downstream plastic pipe installation

will be loaded with a pressure of 12 bar.

The bare-wire heating system is enclosed

within a pressure-resistant copper sheathing.

The heating system is especially suitable for

hard water, i.e. containing lime (for areas of

operation see Table 2).

2. Installation instructions for the qualified installer

Structure

1 Power selector switch

2 Shower comfort switch

3 Cover cap (cover securing screw)

3aShort operating instructions (inside)

4 Cover

5 Lower part of the back plate

6 Hot water connection

7 Cold water connection (3-way cut-off)

8 Fastening screw assembly support

(service)

9 Upper part of the back plate

10 Terminal block

11 Safety pressure limiter (AD 3)

11a Reset button for safety pressure limiter

(in the event of a fault)

12 Differential pressure switch/flow

regulator MRS

13 Heating system

14 Fastening screw

15 System pressure switch

16 Toothed bar

17 Setting lever

18 Lower part of device fixing assembly

19 Electricity supply concealed in lower

area of device

20 Electricity supply concealed in upper

area of device

21 Device fixing point for replacement

against DHA

22 Device fixing point on top in new

installation

23 Dimension for installation, “wall flush

fitting”

24 Fixing holes for replacing third-party

products

25 Knurled nut for rear wall alignment in

the event of tiles being uneven

26 Knock-out point for fitting bracket

provided with DHB 12-27 Si and for

installed DHB and DHF fitting bracket in

the event of replacement

27 Knock-out point for installed fitting

bracket of Stiebel Eltron DHE

28 Engagement hooks for lower part of

rear wall

29 Connection line

30-32 Connection of priority circuit

33 Blanking plugs

34 Cable grommet

Special fittings

(Special instructions for mono-bloc mixers

and thermostat fittings)

 Mono-bloc mixers and thermostat fittings

must be suitable for hydraulically-controlled

instantaneous water heaters (take note of

the manufacturer’s instructions).

 Shower heads with low pressure losses are

to be provided for.

Mono-bloc mixers:

– The flow pressure when operating with

mono-bloc mixers, for example with

DHB 21, should be at least 3 bar.

With low flow pressure:

– Power selector switch at position ●●

– Shower comfort switch in latching position

(greatest temperature increase). The

flow pressure is considered sufficient when

a water temperature of less than 35 °C can

be set at the fitting without any problems.

Regulations and

specifications

– The installation (water and electrical

installation) and the first-time operation

and maintenance of this device may only

be carried out by a qualified installer, in

accordance with these instructions.

– Regulations of the local energy supply

company

– Specifications of the water supply company

concerned

– Fit the device with the lower section flush

with the wall (respect dimension

 110 mm (23)). Also secure the device at

the bottom (18).

Other points to be noted:

– The device rating plate

– Technical data:

The specific electrical resistance of the

water must not be less than that indicated

on the device rating plate. With a water

mains network, the lowest electrical

resistance of the water is to be taken into

account (see table 2). You can find out the

specific electrical resistance or electrical

conductivity of the water from the water

supply company.

Operation with pre-heated water of more

than 25 °C is not permitted.

– Accompanying pipe heating (trace heating)

is not permitted.

– Material of the water installation:

Cold water pipe:

Steel, copper, or plastic pipes

– Operating conditions in accordance with

DIN 1988, Part 2, December 1988, Section

2.2.3, Table 1.

Hot water pipe:

Copper

Plastic piping systems:

The integrated installation pressure switch

allows for installation with DVGW-tested

plastic pipes. To determine the suitability of

plastic piping systems in conjunction with

the DHB, the following instructions are to

be adhered to:

The operating conditions apply as per

DIN 1988, Part 2, December 1988, Section

2.2.3, Table 1.

Respect the instructions provided by the

plastic pipe manufacturer.

– Electrical connection only to a permanent

connection.

– Fittings:

Fittings for open devices are not permitted.

– Safety fittings:

A safety valve is not required.

The device must be connected to the

protective earth conductor (see

– The device must be capable of being

isolated from the mains, for example by

fuses, with an isolating distance of at least

3 mm.

English

Installation location

The DHB is to be installed vertically

in accordance with

(over-sink or

under-sink) in an indoor, frost-free

location as close as possible to the outlet

points. In the case of under-sink

installation, it will not be possible to rotate

the cover

(not the back plate).

Preparing for installation:

– Open the cover cap , release the

securing screw, and remove the cover.

– Remove (a) the lower part of the back

plate

by pressing the two engagement

hooks (28) forwards (a).

– Determine the knock-out point on the

back plate of the device for securing to the

fixing bracket:

– Knock out position 26 when using the

fixing bracket provided.

– Knock out position 27 when installing

the device on the existing Stiebel Eltron

DHE fixing bracket.

– Flush through the cold water pipe

thoroughly.

– Install the water connection components in

accordance with

or . Take note of

the arrows indicating direction of flow.

– When replacing devices DHB-S, DHB-SK,

and DHF by a DHB-Si, the cold water 3-

way shutoff valve can continue to be used.

– With the aid of the installation template,

determine the position of the cable feed

(concealed connection) and of the fixing

bracket.

– Cut the electrical connection cable (29) to

length and strip the insulation.

– Secure the fixing bracket

in the

appropriate manner. If replacing a Stiebel

Eltron DHA instantaneous water heater,

the existing fixing holes (21) can be used,

and the fixing holes (24) if replacing a

device of a third-party manufacturer.

– Secure the device with the screw (8) on

the fixing bracket. By using the knurled nut

(25), any unevenness in the wall surface,

for example due to tiles being offset, can

be compensated for, up to a maximum of

20 mm

(illustration below).

Water connection

– Fit the components supplied with the

device.

The 3-way valve should not be used as an

isolation valve!

 Concealed screw connection

 Surface screw connection

Suitable Stiebel Eltron surface-mounted fittings

are WKMD and WBMD (see „Special

Accessories“).

The prot.-mode IP 25 is applicable,

only when the following steps are

carried out:

– Saw the rear wall lower part to size in

order to facilitate installation (cutting width

max. 2 mm).

– Use brass blanks (33) G ½ instead of the

double nipple. Blanks form part of the

scope of supply of Stiebel Eltron WKMD

and WBMD fittings. If third-party fittings

have been used, or if a surface connection

is involved, the special accessory “2 water

plug set” is required (see “Special

Accessories”),

– Conventional commercial connection pipes

with diameters 12 and 16 mm and solder

screw connections G 1/2 may be used.

– Insert the plastic guide elements into the

cover (see “Concluding installation, 4.”).

Electrical connection

– In the case of concealed installation, the

insulated connection cable must project at

least 30 mm, out of the wall (29).

– Priority circuit:

In combination with other electrical

devices, such as electrical storage heaters,

the load shedding relay is to be fitted:

30 Control cable to the protective

contactor of the second device (e.g.

electrical storage heater).

31 Control contact, opens when the DHB

is switched on.

32 Load shedding relay (see page 14).

Load shedding occurs when the DHB is

operated.

The load shedding relay may only be

connected to the middle phase of

the device terminal block.

 Connection in the lower part of the

device

In the state as delivered, the device is ready

for electrical connection in the lower part.

– Fit the device as shown in the illustration.

– To seal against water penetration, the cable

grommet (34) supplied must be used.

– Connect the connecting cable in accord-

ance with

to the terminal block (10).

See page 14 for completing installation.

Type DHB 12 Si DHB 18 Si DHB 21 Si DHB 24 Si DHB 27 Si

Water connection (external thread)

G 1/2

Design closed

Rated content 0,4 l

Protection class as per VDE 1

Protection mode as per VDE IP 25

IP 24 for under-sink installation with rotated cover

Weight 5 kg

Rated overpressure 10 bar *

Test marks See device rating plate

Electrical connection 3/PE ~ 400 V

Heating output Stage  /   /   /   /   / 

Setting of power

●●● kW 5,6 / 11,1 9 / 18 10,5 / 21 12 / 24 13,5 / 27

selector switch ●● kW 3,7 / 8,8 7 / 15 7 / 17 7,5 / 19 7,5 / 20

● kW 5,6 / – 9 / – 10,5 / – 12 / – 13,5 / –

Switching volumes Stage  l/min > 3,0 > 3,4 > 3,6 > 3,8 > 4,0

Type Indicated as Operation ranges for different reference

temperatures *** of the water analysis under

Standards data

at 15 °C 20 °C 25 °C

DHB 12 Si

Specific electrical  1000 cm  890 cm  815 cm

resistance

corresponds to

specific electrical 

100 mS/m  112 mS/m  123 mS/m

conductivity  1000 S/cm  1124 S/cm  1127 S/cm

Stage  l/min > 3,4 - 12 > 5,1 - 12 > 6,0 - 12 > 6,8 - 12 > 7,5 - 12

Switch-on flow pressure

(pressure loss) bar 0,5 0,8 0,95 1,15 1,3

at flow volume ** l/min 3,4 5,1 6,0 6,8 7,5

* if the water pressure is above 10 bar, a pressure relief valve has to be installed

** Shower comfort switch in latching position

DHB 18 – 27 Si

Specific electrical  900 cm  800 cm  735 cm

resistance

corresponds to

specific electrical 

111 mS/m  125 mS/m  136 mS/m

conductivity  1110 S/cm  1250 S/cm  1360 S/cm

*** Note: The values for the specific electrical resistance or the electrical conductivity will be

determined in a different manner from region to region, at differing temperatures. This

must be taken into account in the assessment.

Table 2

Technical data

Operation ranges for instantaneous water heater related to the specific

electrical conductivity / specific electrical resistance of the water

 Connection in the upper part of the

device

Prepare the device for electrical connection

in the upper part.

– Break through the marked inlet aperture in

the rear plate (a) of the device.

– Shorten the cable grommet for providing

the seal (b), wet it on the inside with a

lubricating agent for better fitting (ease of

sliding), and fit it in the back plate (c).

– Release terminal block (d).

– Fit the terminal block (e) in the upper part

of the device. Care is to be taken to

ensure that the switching leads do not

project over the back plate of the device.

Carry out the electrical connection

To provide protection against water

penetration, the cable grommet (34)

provided must be fitted in accordance with

and the dimensions respected.

Establish the electrical connection in

accordance with

See concluding the installation.

Concluding the installation

1. Open the 3-way shutoff valve (a).

Secure the lower part of the back plate (b).

3. Fit the lower fixing screw (c).

 Water connection on surface

With the water connection on the surface,

break through the knock-out apertures (a)

in the cover in an appropriately clean

manner, using a file if necessary. The guide

pieces (b) provided with the device should

be engaged in the penetration apertures.

 Installation over-sink

– Bring the inside toothed bar into the

middle position (a).

– Fit the cover, secure the screw, and close

the cover cap (b).

– Turn the shower comfort switch and

power selector switch (c) to the left and

right stops (internal setting lever will

engage).

 Installation under-sink

If installed with the cover rotated,

the device has the protection mode

IP 24 (protected against spray water).

– Move the snap nut from the bottom to

the top (a).

– Cover over the cover label (Stiebel Eltron,

Temperature trail and rating plate) using

the adhesive label supplied (backing film

serves as fitting aid):

- Remove protective film (b)

- Align the label (c)

- Press the label in place (d)

- Draw off the backing film (e)

- Press the label in place (f)

- Cover over IP 25 on the rating plate

with IP 24 (g)

- Move the lever to the left engagement

position (h).

– Mount cover, tighten screw and close the

cover cap (i).

– Rotate the shower comfort switch and

power selector switch (j) to the left and

right stops (inside setting lever engages).

3. Guarantee

For guarantees please refer to the respective

terms and conditions of supply for your

country.

The installation, electrical connection

and first operation of this appliance

should be carried out by a qualified

installer.

The company does not accept liability

for failure of any goods supplied which

have not been installed and operated in

accordance with the manufacturer's

instructions.

4. Environment and

recycling

Please help us to protect the environment by

disposing of the packaging in accordance with

the national regulations for waste processing.

5. Servicing instructions

qualified installer

Removing the components from the back

panel:

1. Release the central fastening screw

assembly, item (a).

2. Pivot the module carrying components

out of the back panel.

Fitting the disengaged toothed bar

1. Rotate the toothed wheel (b) in the

clockwise direction by hand, as far as the

stop.

2. Slide the toothed bar (c) in from above.

Replace the safety pressure limit switch

(AD 3).

1. Press the engagement hooks (d) in the

direction of the arrow

2. Rotate AD 3, item (e) counter-clockwise

(bayonet fitting).

Initial operation

1. Fit device in position.

2. Fill device with water.

3. Engage the power selector switch

and

shower comfort switch

by rotating it

to the left and right and then bring it into

the basic setting.

4. Connect the fuses.

5. Check function.

Handing the device over to the

customer

1. Select basic position and .

2. Explain the positions of the power

selector switch and the shower comfort

switch (see page 11).

If the water pressure is low, move

the shower comfort switch into the

engagement position and set the power

selector switch to position ●●.

3. Draw the attention of the user to the risk

of scalding.

4. Indicate the location of the short

operating instructions in the cover (3 a).

Accessories

Two-handle pressure fittings

– Kitchen fitting WKMD,

Order No. 07 09 17

– Bath fitting WBMD,

Order No. 07 09 18

– Grohe Relaxa hand-held shower, plastic,

chrome-plated with especially low

pressure loss (0.2 bar at 10 l/min),

Order No. 06 85 21.

Area of use:

With particularly low supply pressure in

the water installation, a clearly improved

temperature stability will be achieved

when showering.

– Load-shedding relay LR 1-A,

Order No. 00 17 86

Priority circuit of the DHB with

simultaneous operation, for example, of

electrical storage heaters.

For connection of LR 1-A, see

– Pipe set

Gas device replacement, for DHB-Si,

Order No. 07 35 28

Surface connection with cold water on the

left and hot water on the right side.

– Pipe set

Installation under-sink, for DHB-Si,

Order No. 07 05 65

Connections: Surface fitting, G

, top.

– Set of two units, water blanking plugs

G ½, Order No. 07 40 19

Required for water installation with fittings

on surface or beneath it, not with WKMD

or WBMD.

6697.02

English

6. Fault-finding - user

The heating system in the DHB does not

come on, despite the hot water tap being

opened fully.

The flow volume required to turn on the

heating system has not been attained.

– Clean and/or descale.

Differential switch/flow regulator (MRS

switching system) does not come on,

despite the hot water tap being opened

fully.

The flow volume required to turn on the

heating system has not been attained.

– Clean the filter intake after unblocking the

cold water pipe.

No hot water, despite the fact that the diffe-

rential switch can be heard switching on.

– The safety pressure limiter (AD 3) has

switched the device off for safety reasons

(pressure peak in the water installation

> 12 bar).

– Eliminate the cause of the fault (e.g.

defective pressure spray), press blue

button on the safety pressure limiter

(11 a), but only with the tap open and the

device free of pressure.

– Remove the cover. Move the toothed bar

into the middle position and refit the

cover.

Rotate the shower comfort switch and

power selector switch to the left and right

stops (inner setting lever engages) and

bring it into the basic setting.

– Shower comfort switch in wrong position.

– Dirt contamination or lime scale on the

percolators in the fittings or the shower

heads.

– Move the shower comfort switch to the

latching position

– Replace heating system.– Heating system defective.

– Dirt filter (in

) blocked.

– Toothed bar (16) not engaged.

Fault Cause Rectification

7. Fault-finding - qualified installer

Fault Cause Rectification

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 

%&

  

 

-"

*! 1

8"

  



&

.#?.1$

  !

6

@  %

'

" 

 &

@ #$"

&"&

 "

 

:

#12$ 

&

3

 4;



1 

A&



#

;$



. # !

 

 

 

 

 

 

 

 

 

 ! 

 

 

 "

#$%

 

"



  "&

'()

 

 

 

  

 *

 

 



 



 

$+#

 



 

 

,

 



 -

 $+./0!01)

 $+.

$+2

 

 $+3)

3

 

 





 

 

/&'!

#&&

+ $

  +

  %





#&

 $

 %



3$!

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 &

&

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 !"#$%&"!&CDE

EF!

➠ OPQPRPSO

PTU

➠ TVR PDP

RPPPU

 !U W



 DDDE

#FDE

XYRPVPQ

QPQ P

WP YPURUUPP

PU#Z

$

? WUD QP

PD)/QSU,

D!

➠ PTPUP

PPR

PWWPR

,W,-T R  YPU

RUUPTTUPV

TVU YPUP

TRU



Z1YPWU [

PU P 

PQUPPQ\"\U PUWU

PUY

#D#G

➠ TPTR PU

PLP,W,WPR

"!TUPV



 YZP\PWU

TP !U 

W-T UU RP

PQUP

UY

 D



EF

➠  !UWTOPY

PR

DHDI!

➠ ●●● ●●

OUPQ 

➠ -YPW\U

OPQ U

PPW 

 GEJPPPUU

V !UW

PR



/PWW\U

TP\U VU WPP

YP !U

W C"HE

EDF5HE

KL7D)*<6)

02!34

!)

XQPQZ●●

 YZ"PW\OPRO"

PWUTST

"P-

\OUPV PQPQ

Z●●● #WW\OU$





-TPOOPR

 T [YPW

P\\UY]E^B> 

TUOUO U 

HEGEM

XPURP [Y

VQR TUPV

PTQPQ Q W 9

IT\TUPPTUPV

"TP[U PPU

U"P_TOPQ

PU TUPVP

WUUS6

4 *TUPTUPV#"

V$

; \UPUPTQ

TUPV PTQ

"TUPVU

RPP\U

< -TTUPTUPV#"

V$

>TUP\OP"

WPW Q

W9

4CDEJD

-VUU WPU

WP[

PDPDU  OU 2 WU

[PR YPURPT

YPU URP#P4$6



5PURP



5 URP



5PQUP

CEDJ!

@ <`^B6TPWU" U

"\OUP

@ ]E^B6TTYU

 Q # !U

WPDPR

53'

TUQ[PQTUPV

TUPWP"O U[

TU 

06789

NHDI

➠ T[URPQ

TO

EF

➠ PO\U !TPWU



NHDI

●●● "DOPEIDI

➠  RPQPRT[UP

PUPWP

UR  YPURP"

PO\UUPQ\UT







R R PQ

●● QID

➠  RPQPRT[UP

PUPWP

UR  YPURP"

SQPT











R PQ#UP$

● DHEDI

➠ PRPUPVUQ

PQ"QQPQPW

#P WT/=X$

EF

IDE

➠ OU YPUPT

PWU"TOPTR P

RPOPR

DJDE

➠ YUPR/=X

TUR PDPR

P

 :9;!3

 PQPQPVWU

PU●●●

  !UW

WUPU

 T\\OUTU

 POTOPR

PUP

V VPWU

\UTUVOHE

02!8!9!3

 GFDFE

O!

DHDI!

➠ ●●●

EF!

➠ PRPU

#PO\U

UPQ\U$

➠ YPWPU



 GFDFE!

DHDI!

➠ \OUP"●●●

➠ PWUPDRO"●●

RC

aYWTRW UPWO

QR-T

"R [Y

PR U"OHE

JHGE"

7\TUVUPVQ

TU(YUPYWW\O

VUT\UUP9

FDFCCEDFE

/WPVPOP"

T OO  

TTPWOUSYWTQ

UTUQPW

UP"W

PWOUU "RU

4



# URP$

     





     

     

     



#PQUP$

     





     

     

     



SJ!

-P<]

067;!<!3

XPURP

[YVQR TUPV

PTQPQ Q

W 9

IT\TUPPTUPV

"TP[U PPU

U"P_TOPQ

PU TUPVP

WUUS6

4*TUPTUPV#"

V$

;\UPUPTQ

TUPV PTQ

"

TUPVUR

PP\U

<-TTUPTUPV#"

V$

@ *TUPVVTUPR

P#WPWUP$

PPTQ

 UU UP

YWPO\UUPO\U

OPR U

@ X\! YRPD 

WP UQVPOO

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F"F!

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@ Q

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Q \UYP

PQPR \U9=R

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#PD;$1!QQ

PPP

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-PTTWPO

P\\UY;C^BTUQ9

@ 1OYRPRUPOY

TUR9

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PPUU6

EJD!

PR" OOR O R



EJD!

OOR

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PQVUUV

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 O QP[

-TPWUP

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[PQ[

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YQ P9

@ 

PRTUPV

TUR

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P\PWU

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5'!39 

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Y\UU

 G"EE

 G"EE

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37?3?#P?DFPE

GEPDE$

8U:-;CV"

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TUO#\UTT 2;D $

@ -YPUUW#**$FD½

/TYDU 37?

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WY UR

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PUUW#P?DFPE

GEPDE$

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4]D PQ \U FD½

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?85'!3

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TPUPU#8<$

@ TUUWU6

T [PRTUPV

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 VU   Y

YUPPUR6

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PP#1.$T

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@ (UPP PU

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'(



'(&

&



0+, !"

567898:;:6<=>,+



+,

 ?@*ABB

,+



+

+,

,+,

1CD52

/ E



&+',





/ ,+E

14(2

++

1

2

F+,,

12

+,

 GHI+

&,

&

+

*

.

+

J

,'(

&%1

2

2. 



 K+%

 +

 J

12

 L(12

 L

 3+

 ,+



 

12

 J

 +



 L

 0

1M -2

 L,

1+

2

 N44(

O,CD5

 3,'

 L

 

 F+

 0+,

 3

 P+

+

 P+

+

 L !M

 L

 0,

 Q

(&,,



 Q

%

 R,

 !"*$S57

 !"

!T

 R

567898:

;:6<=> !;

 J++



 0+

0+,

+

 F,

 3+



1+,

2

 J+



,++

,1

2

 0,

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/ '(

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L%?]U,



%()

/ N,+

+1

2

/ ,12

H

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,

F,

I\C I"C 567898:

;:6<=>0

,





^3

,_12'(

'!2

/ R,

**`

Ha½

/ 

%1b8%9

!#-b2

! 

 

/ 0

+

12-X

/ 0+)

,

'+&

&'+

,&

,)

 0(

%+,

1&

,,2

 L

+ !"



K,12

2"14$*%++

'&$'(:;<=

K,

+

4

 >$)%!

'"

N+

'++



/ 



/ N%%

+

+

12&E

Z

/ 0+

\

8%9!-!-

"

0 !"+

,

1

2

%&







+0





14))

$2





/ J

&&



/ .+

&+12

/ c+c





/ 





/ 

%

 !;

567898:;:6<=>

/ J



/ +



 J



/ 0 !"$5& !"$5\

 !T !"$57





/ .%,

(

12%

/ J

'+,+12







0

+,, !M567898:

;:6<=>%

12

/ 0%.

%,

(

9:;#<= 9:;><= 9:;#<= 9:;#<= 9:;#5<=

'-*! ?½ 2"&3

 "!

& @A

"/!B9C 

"/!B9C DE#1ADE#

!8

 1

F&"!*

@

&!" *!!

.*-* +GECH@@ &

,/& %&               

'* ●●●   1A4 GA I G> @A1G # # G # +A1 G #5

!/ ●●   +A5 G >A> 5 G1 5 G 5 5A1 G I 5A1 G #@

( "*!)

JJ"!A

*

1KL #@KL #1KL



%M**

 @@@ NO  >I@ NO  >1 PNO

%

%M*  @@ O<GO  # O<GO  #+ O<GO

 @@@ <GNO # <GNO #5 <GNO

●   1A4G Q I G Q @A1G Q # G Q +A1 G Q



%M**

  I@@ NO  >@@ NO  5+1 NO

%

%M*   O<GO  #1 O<GO  +4 O<GO

 @ <GNO #1@ <GNO +4@ <GNO

** "R*!M**

-""*!)



6!.

#$ $

 !"

#!$ !#!!%

S! %& G T+A@ T+A T+A4 T+A> TA@

-* %& G T+A$# T1A$# T4A@$# T4A>$# T5A1$#

0*

-*23



@A1 @A> @AI1 A1 A+

SJ G +A 1A 4A@ 4A> 5A1

J!8-*&M"

 >$)%%/

'"

0,+

+

/ 

12

/ +1?2&

,%

1+,2

1@2

/ J1A2

/ 

+1B2.

&+(

+



C$'$)

N%%

+

+

12&E

3+





J%'+





8%9!-

8%9!

- J1D2

- F4+

1?2

-



1@2

- 0+1

2

0+

12



&+



%

1?2

 !$%

/ +

12

/ &



1?2

/ 0

++

%

14,

,+,2

 !'$%

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

%?]1%,

2

/ d%,

1D2

/ 3

)

$ %1?2

$ 1@2

$ 01A2

$ .1B2

$ 01E2

$ 3?]U?]1F2

$ +,4

1G2

/ 

F

1H2

/ 01I2

++

%

14,

,+,2

%

- 

- F

- +%



+





- +

- 04(

2'"$

- (

 

- JE+

(+%

,,+

12

0+



+

4(&+

%●●

- J

&+%,

- 0(

12



&

.%+'+

/ +$/JKL:

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/ +%J<L:

3)

/ M9NOPGBQBRBSD&

+

&

1X&*XO2

3)

J)

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



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0+ !"

'(,

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&'+

,

0+eD*$M



/ V$"

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!"$57

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&,+/

/ V$"

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3)

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H-OB&

/ V$419$N

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&

0567898:

;:6<=>I\C I"C

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

,,



F4(

,,



567898:;:6<=>



R&

'(

,

(

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6697.02

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STIEBEL ELTRON DHB 21 si Instructions for Use and Installation

Brand: STIEBEL ELTRON

Model: DHB 21 si

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