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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
Stage
Setting of power
selector switch
Switching volumes Stage I
Stage II
Switch-on flow pressure
(pressure loss)
at flow volume **l/min
*
if the water pressure is above 1 MPa, a pressure limiting valve has to be installed
** Shower comfort switch in latching position
Operation ranges for instantaneous water heater related to the specific
electrical conductivity / specific electrical resistance of the water
Type
Indicated as
DHB 12 Si
Specific electrical
resistance
corresponds to
specific electrical
conductivity
DHB 18 – 27 Si
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
C
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
E
the cover
(not the back plate).
Preparing for installation:
F
–
Open the cover cap, release the
1
securing screw, and remove the cover.
1
2
G
–
Remove the lower part of the back
2
plate by pressing the two engagement
3
hooks
forwards
.
3
4
– Determine the knock-out point on the
4
5
back plate of the device for securing to the
5
6
J
fixing bracket
:
6
7
– Knock out position 27 when using the
7
fixing bracket provided.
8
– Knock out position 28 when installing
8
9
the device on the existing Stiebel Eltron
9
10
DHE fixing bracket.
10
11
11
12
12
13
DHB 12 Si DHB 18 Si DHB 21 Si DHB 24 Si DHB 27 Si
1 MPa (10 bar) *
IP 24 for under-sink installation with rotated cover
See device rating plate
3/PE ~ 400 V
I / II
I / II
kW
5.6 / 11.1
9 / 18
10.5 / 21
kW
3.7 / 8.8
7 / 15
kW
5.6 /
–
9 /
–
10.5 / –
l/min
> 3.0
> 3.4
l/min > 3.4 - 12
> 5.1 - 12
> 5.6 - 12
MPa
0.5
0.65
3.4
5.1
5.6
Operation ranges for different reference
temperatures *** of the water analysis under
Standards data
at 15 °C
≥1000 Ωcm
≤
100 mS/m
≤
1000 µS/cm
≥ 900 Ωcm
≤
111 mS/m
≤
1110 µS/cm
– Flush through the cold water pipe
thoroughly.
– Install the water connection components in
accordance with
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
length and strip the insulation.
– Secure the fixing bracket
appropriate manner. If replacing a Stiebel
Eltron instantaneous water heater DHA or
DHF (hight 370mm), the existing fixing
J1
holes
(22) can be used, adjust the
fixing bracket accordingly.
Use the fixing holes (25) if replacing a
device of a third-party manufacturer.
closed
0.4 l
5 kg
1
IP 25
G 1/2
I / II
I / II
I / II
12 / 24
13.5 / 27
7 / 17
7.5 / 19
7.5 / 20
12 / –
13.5 / –
> 3.6
> 3.8
> 4.0
> 6.3 - 12
> 7.0 - 12
0.8
0.95
1.15
6.3
7.0
20 °C
25 °C
≥ 890 Ωcm
≥ 815 Ωcm
≤
≤
112 mS/m
123 mS/m
≤
≤
1124 µS/cm
1127 µS/cm
≥ 800 Ωcm
≥ 735 Ωcm
≤
≤
125 mS/m
136 mS/m
≤
≤
1250 µS/cm
1360 µS/cm
H
I
or
. Take note of
K
to
J
in the
– Secure the device with the screw 8 on the
fixing bracket. By using the knurled nut 26,
any unevenness in the wall surface, for
example due to tiles being offset, can be
compensated for, up to a maximum of
D
20 mm
(illustration below).
Water connection
The 3-way valve should not be used as an
isolation valve!
• Concealed screw connection
Fit the components supplied with the
device.
• Surface screw connection
The IP 25 protection mode (Jet-wa-
terproof) is guaranteed in the case of
the following connection.
a With a Stiebel Eltron surface-type tap
fitting WKMD or WBMD (see "Special
1
Accessories" page 14):
2
1. Saw the rear wall lower part to size in
3
order to facilitate installation (cutting
width max. 2 mm).
4
2. Use water plugs G ½
. Water plugs fall
5
within the scope of supply of the Stiebel
6
Eltron WKMD and WBMD fittings.
7
In the case of third party tap fittings, the
8
special accessory module with 2 water
9
plugs (see "2.12 Special accessories") is
required.
10
1
11
b In the case of surface-type installation
2
(see "Special accessories" page 14):
12
3
1. Saw the rear wall lower part to size in
13
4
order to facilitate installation (cutting
14
5
width max. 2 mm).
1
15
2. Use water plugs G ½
.
6
2
16
3. Use ½" union nuts with inlets for
7
3
Ø 12 mm diameter soldered joints
17
8
4
Make a junction with 12 mm copper pipe.
18
9
5
19
10
Electrical connection
6
20
11
7
– In the case of concealed installation, the
21
insulated connection cable
12
8
22
at least 30 mm, out of the wall.
13
9
23
– Priority circuit:
14
10
In combination with other electrical
24
15
11
devices, such as electrical storage heaters,
16
12
the load shedding relay is to be fitted:
a
Control cable to the protective
17
13
contactor of the second device (e.g.
18
14
electrical storage heater).
19
15
b
Control contact, opens when the DHB
20
is switched on.
16
c
Load shedding relay (see page 14).
21
17
Load shedding occurs when the DHB is
22
18
operated.
23
19
The load shedding relay may only be
24
20
connected to the middle phase of the
21
device terminal block.
22
• Connection in the lower part of the
L
23
device
.
In the state as delivered, the device is ready
24
for electrical connection in the lower part.
– Fit the device as shown in the illustration.
– To seal against water penetration, the cable
grommet supplied must be used.
– Connect the connecting cable in accord-
K
ance with
to the terminal block.
See page 14 for completing installation.
H
I
1
2
3
4
5
6
.
7
8
9
K
10
11
must project
12
13
14
15
16
17
18
19
20
21
22
23
24
13
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