8
to the cold water temperature prevailing at the
place of installation, the hot water outlet tem-
perature in each case can be obtained.
Example:
Basic power setting 8.8 kW
Flow rate 4 l/min
Temperature increase 32 °C
Cold water inflow 10 °C
Hot water outflow 42 °C
1.4 Safety instruction
!
Danger of scalding!
In the case of temperature selec-
tion, water temperatures of over 43 °C can
be reached at the hot water outlet.
!
Risk of injury!
Where children or persons with limi-
ted physical, sensory or mental capabilities
are to be allowed to control this appliance,
ensure that this will only happen under su-
pervision or after appropriate instructions by
a person responsible for their safety.
Children should be supervised to ensure that
they never play with the appliance.
1.1 Description of the unit
The DHA 4/8 L hydraulically-controlled small
instantaneous water heater heats the water
while it is flowing through the unit. The heat-
ing system in the unit switches on from a flow
volume of > 3.0 l/min.
1.2 The most important points - in
brief
1. Set the heating capacity at the selector
switch (1)
Stage xÖ Reduces the hot water outlet
temperatures
Stage xxÖ Full hot water outlet tem-
perature
2. Open hot water fitting on the fitting
ÖThe unit will heat up; display “Power”
(2).
1.3 Operating
“Overheating” light (3) on:
This means the unit is reducing the power
because of an excessively high inflow tem-
perature. Once it has cooled down, the unit
will automatically switch the heating power
back on.
The basic power rating, set by a qualified in-
staller (selectable: 8.8; 6.6; or 4.4 kW at 230 V),
the cold water inlet temperature, and the flow
volume at the fitting, are the factors which
determine the outlet temperature. If the outlet
temperature is too low, set the selector switch
to Stage xx, or reduce the flow rate.
Table 1 (on page 2) shows the temperature
rise at the individual power ratings, as a func-
tion of the flow rate. If these values are added
1.4 Wichtiger Hinweis
!
Alle Informationen in dieser Ge-
brauchs- und Montageanweisung
müssen sorgfältigst beachtet werden. Sie
geben wichtige Hinweise für die Sicherheit,
Bedienung und Wartung des Gerätes.
1.5 Important notes
!
All the information in these instruc-
tions for operation and installation
must be followed carefully. They provide
important information regarding safety,
operation, and maintenance of the unit.
1.6 Care and maintenance
A damp cloth is sufficient to clean the unit.
Do not use any foaming or abrasive cleaning
agents!
!
Maintenance work may only be car-
ried out by a qualified installer.
1.7 What do you do if . . . ?
See Table 2.
2.1 Description of the unit / unit
structure
The Stiebel Eltron DHA instantaneous water
heater is a hydraulically-controlled pressure
unit for hot water supply to one or more draw-
off points.
1Selector switch for heating capacity
2Power” light: Unit is heating up
3“Overheating” light: Outlet temperature
> 65 °C
4Terminal strip for electrical connection
5Cable bushing for electrical connection
cable, concealed and visible
6Safety thermal cutout with reset push but-
ton
7Differential pressure switch
8Flow rate adjustment screw
9Terminal strip with terminal bridges for
power rating selection
10 Cold water connection G ½, surface
installation
11 Hot water connection G ½, surface
installation
12 Cold water connection G ½, concealed in-
stallation
13 Hot water connection G ½, concealed in-
stallation
14 Fixing position
15 Filter
16 Reset button for safety thermal cutout
2.3 Specifications and provisions
– The specifications and provisions of the local
energy supply company and the water supp-
ly company concerned are to be respected.
2.4 Important notes
– Make sure the data on the unit rating plate
is current
– Install the unit so that it is flush with the
wall
– Material for the water installation:
Steel, copper, or plastic piping systems.
If plastic piping systems are being used, the
following instructions are to be respected:
In the event of a fault, the following loads
may occur in the installation:
– Temperature: max. 95 °C
– Pressure: max. 1 MPa
– Electrical connection to securely fixed lines
only.
– The unit must be capable of being isolated
from the mains, for example by fuses, with
an isolated distance of at least 3 mm.
!
The unit must be connected to the
protective earth conductor (see
electric circuit diagram).
– Fittings for open units are not permissible.
– A safety valve is not required.
Table 2: What do you do if . . . ?
2.2 Technical data
the data on the unit rating plate are applicable
Type DHA 4/8 L
Part number 073716
Design type Closed
Capacity 0.5 l
Rated pressure 1 MPa
Weight 2.5 kg
Protection class as
per IEC 335-1
I
Protection mode as
per IEC 529
IP 24
Test marking See unit rating plate
Water connection G 1/2 A (external thread)
Electrical connection 1/N/PE ~ 220 ... 240 V
Rated power kW kW kW
at 220 V
at 230 V
at 240 V
8.0
8.8
9.6
6.0
6.6
7.2
4.0
4.4
4.8
Use Over-sink unit for the
supply of one or more
draw-off points.
Switch-on flow rate > 3.0 l/min
Switch-on flow pres-
sure (pressure drop)
at flow rate
0.03 MPa
3.0 l/min
Suitable for cold
water
up to 25 °C
Fault Cause Rectification
No hot water despite
the hot water fitting
being fully opened.
Unit is not heating up. Check the fuses and replace them if
necessary.
The flow rate of > 3.0 l/min. required
for the system to switch on is not being
attained.
Dirt contamination or limescale formati-
on in the flow regulator in the fitting or
in the shower head.
Cleaning or descaling the flow regulator
in the fitting or in the shower head.
1. Operating instructions for the user and the qualified installer
2. Installation instructions for the qualified installer
