Download Table of Contents Print this page

Water Supply; Electric Supply - Siemens DE 21405 Installation Instructions Manual

Hide thumbs Also See for DE 21405:
Table of Contents


Available languages
  • EN

Available languages

  • ENGLISH, page 4
Assemble the continuous-flow heater as shown in the
illustrations. Observe the information in the text.
Sa f et y in f or m a ti o n
The continuous-flow heater must only be connected
and started up by an authorized technician.
The statutory regulations of the respective country, as well
as those of the local electricity and water suppliers must
be adhered to.
The continuous-flow heater is an appliance of protection
class I and must be connected to the protective earth
The unit must be durably connected to permanently
installed lines.
In order to meet the current safety requirements, an
all-pole disconnecting device must be present on the
installation side. The contact gap must be at least 3 mm.
The continuous-flow heater is suitable for enclosed
(pressurized) operation only.
The tap fittings must be permitted for operation with
enclosed (pressurized) continuous-flow heaters.
The continuous-flow heater must only be connected to
a cold-water pipe.
The continuous-flow heater is suitable for connection to
DVGW-tested plastic pipes.
The continuous-flow heater must only be installed in
a frost-free room.
Prior to installation, the electric connecting cord
must be disconnected from the mains voltage and
the water supply cut off!
Only connect the electric supply after the water
When making holes in the rear wall, only make the
number of holes required for installation. If the appliance
is reinstalled, any holes that are not used must be made
Live components must not be touched subsequent to
As se mb ly
Unpacking/removing the
housing cover
Unpack the appliance and check for transportation
Dispose of the packaging and, where applicable, the old
appliance, in an environmentally conscious manner.
Preparation for assembly
Wall-mounted assembly
The continuous-flow heater must be fitted securely to the
wall. If required, secure the appliance using the lower
adjusting screws.
The distance from the wall is variable. This allows you to
compensate for any unevenness in the wall surface.
The sleeve must fit tightly round the connection cable. If
the sleeve is damaged during installation, the holes must
be sealed water-tight.

Water supply

The flow-through heater must be vented. Open the
warm water tap completely and allow to flow through
for one minute.

Electric supply

The mains connection terminal can either be mounted
above or below. At least 40 mm of the connecting cord's
insulating jacket must be clamped unside the appliance.
For low water line pressure, remove the flow limiter (see
Supplementary Information A).
Instruct the user with regard to the operation of the
continuous-flow heater.
Separate the required language version from the rest of
the operating instructions. This can be kept in the swing-
out control panel of the continuous-flow heater.
A d d i ti o na l i n fo rm at i o n
If the flow-through heater does not achieve adequate
flow as a result of water line pressure that is too low
in your house installation, remove the flow limiter.
Priority circuit for the combination with electro-
storage heating units:
For operation with the priority circuit, a special load
reducing relay BZ 45L20 (special accessory) is
required. Other already existing load reducing relays
with the exception of electronic load reducing relays
could cause malfunctions.
Status Indicator in the Heater
Slow blinking (1/s)
Fast blinking (4/s)
Heater Status
The set temperatures are
not reached (the water flow
rate is too high for the
connection rating)

Hide quick links:


Table of Contents

This manual is also suitable for:

De 18405De 27405De 24405De 40518De 40521De 40524

Table of Contents