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Technical data
Type
Design
Rated content
Weight
Rated overpressure
Protection class as per VDE
Protection mode as per VDE
Test marks
Water connection (external thread)
Electrical connection
Heating output
Setting of power selector switch
Switching volumes
Stage
Stage
Switch-on flow pressure (pressure loss) bar
at flow volume *
* Shower comfort switch in latching position
Operation ranges for instantaneous water heater related to the specific
electrical conductivity / specific electrical resistance of the water
Indicated as
Specific electrical resistance
corresponds to
specific electrical conductivity
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
Installation location
The DHB is to be installed vertically
in accordance with
(over-sink or
under-sink), and 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.
DHB 18 Si
DHB 21 Si
closed
l
kg
bar
IP 25
IP 24 for under-sink installation with rotated cover
See device rating plate
G ½
3/PE ~ 400 V
Stage
/
/
kW
9 /18
10,5 /21
kW
7 /15
7 /17
kW
9 / –
10,5 / –
l/min
> 3,4
> 3,6
l/min > 5,1 - 12
> 6,0 - 12
0,8
0,95
l/min
5,1
6,0
Operation ranges for different reference
temperatures ** of the water analysis under
Standards data
at 15 °C
at 20 °C
900
cm
800
111 mS/m
125 mS/m
1110 S/cm
1250 S/cm
– 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
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
Concealed screw connection
– Fit the components supplied with the
device.
Connection above surface
If using Stiebel Eltron WKMD and
WBMD fittings (see Special Acces-
sories, page 12), the protection mode IP 25
(spray water protected) will still be
guaranteed even with surface connection.
DHB 24 Si
DHB 27 Si
0,4
5
10
1
/
/
12 /24
13,5 /27
7,5 /19
7,5 /20
12 / –
13,5 / –
> 3,8
> 4,0
> 6,8 - 12
> 7,5 - 12
1,15
1,3
6,8
7,5
at 25 °C
cm
735
cm
136 mS/m
1360 S/cm
in the
Points to be noted:
– The lower part of the back plate is to be
fitted before the pipe connections are
made.
– Secure the connection pipes at the fitting
by means of the compression fitting
connections
– Use blanking plugs (33) G ½ brass instead
of the double nipple. Blanking plugs are
supplied with Stiebel Eltron WKMD and
WBMD fittings. In the case of third-party
fittings or surface connections, the special
accessories "Set of 2 blanking plugs" are
required (see page 12).
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 12).
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 12 for completing installation.
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 page 12 for concluding the installation.
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