13
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
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