STIEBEL ELTRON DEM 6 User manual

This water heater must be installed (water and electrical installation),
commissioned and serviced by approved service technicians in
accordance with these instructions.

English
Instantaneous water heater - Operation and installation instructions


DEM 6

STIEBEL ELTRON
2
General information

General information
The chapter Operation is intended for users
and qualified installers.
The chapter Installation is intended for qualified
installers.
Read these instructions carefully
before using the appliance and retain
them for future reference. If the appliance is
passed on to a third party please hand these
instructions to the new user.
This appliance is not intended for use
by persons (including children) with reduced
physical, sensory or mental capabilities, or
lack of experience and knowledge, unless they
have been given supervision or instruction
concerning use of the appliance by a person
responsible for their safety.
Children should be supervised to ensure
that they do not play with the appliance.
This appliance incorporates an earth
connection for functional purposes only.
Fit only shower heads recommended
by the manufacturer and never fit any additional
device to restrict the water outlet flow.
The water inlet of this appliance shall
not be connected to inlet water obtained
from any other water heating system.
This appliance is intended to be
permanently connected to the water mains
and not connected by a hose-set



























STIEBEL ELTRON 3
General information

A disconnecting device must be
incorporated in the fixed wiring in accordance
with the wiring rule. It must have a contact
separation in all poles that provide full
disconnection under over voltage category III
conditions.
The resistivity of the water supply
must not be less than 1100 Ωcm.
The appliance must be permanently
connected to fixed wiring.
The appliance must be earthed
Warning:
This appliance is not to be used for
a potable water supply.






Ωcm







 



 
 




 

 
 



 


STIEBEL ELTRON
4
SPECIAL INFORMATION

- The appliance may be used by children aged
3 and up and persons with reduced physical,
sensory or mental capabilities or a lack of
experience and know-how, provided that
they are supervised or they have been
instructed on how to use the appliance
safely and have understood the resulting
risks. Children must never play with the
appliance. Children must never clean the
appliance or perform user maintenance
unless they are supervised.
- The tap can reach temperatures of up to 55 °C.
There is a risk of scalding at outlet tempera
tures in excess of 43 °C.
- Ensure the appliance can be separated from
the power supply by an isolator that discon-
nects all poles with at least 3 mm contact
separation.
- The specified voltage must match the mains
voltage.
- Connect the appliance permanently to fixed
wiring.
- In the case of damage, the power cable must
only be replaced by a qualified contractor
authorised by the manufacturer using the
original spare part.
- Secure the appliance as described in chapter
“Installation / Installation”.
- Observe the maximum permissible pressure
(see chapter “Specification / Data table”).
- The specific water resistivity of the mains
water supply must not be undershot (see
chapter “Installation / Specification / Data
table”).
- Drain the appliance as described in chapter
“Installation / Maintenance / Draining the
appliance”.
 







 55 °C
43 °C
 


 

 
 


 

 

 


 


STIEBEL ELTRON 5
Content

Eng
1. Operation Instruction ...................................................6
1. Safety....................................................................... 6
1.1 Intended use ...................................................... 6
1.2 General safety instructions ................................. 6
2. Appliance description............................................... 6
3. Settings.................................................................... 7
4. Cleaning, care and maintenance .............................. 7
5. Regulations and Provisions ...................................... 7
6. Troubleshooting ....................................................... 8
2. Installation Instruction ..................................................9
1. Safety....................................................................... 9
1.1 General safety instructions ................................. 9
1.2 Instructions, standards and regulations.............. 9
2. Appliance description............................................... 9
2.1 Standard delivery............................................... 9
3. Preparations ............................................................ 9
4. Installation............................................................... 9
4.1 Installation site .................................................. 9
4.2 Installation options........................................... 10
5. Commissioning....................................................... 12
5.1 Initial start-up.................................................. 12
5.2 Appliance handover ......................................... 12
5.3 Recommissioning............................................. 12
5.4 Settings............................................................ 12
6. Shutting down........................................................ 13
7. Troubleshooting ..................................................... 14
8. Maintenance .......................................................... 15
8.1 Draining the appliance..................................... 15
8.2 Cleaning the strainer........................................ 15
8.3 Appliance storage ............................................ 16
8.4 Replacing the power cable for the DEM 6 ......... 16
9. Specification........................................................... 16
9.1 Dimensions and connections............................ 16
9.2 Wiring diagram................................................ 17
9.3 Application areas ............................................. 17
9.4 Data table............................................................. 18
3. Guarantee................................................................... 20

............................................................................ 21

 
 





 ............................................................................. 24

 
 

 


 
 

 
 
 
 



 
 
 
 

 
 
 
 
....................................................................................... 35

STIEBEL ELTRON
6
1. Operation Instruction for the user and the qualified installer
1. Safety
1.1 Intended use
This appliance is intended for domestic use. It
can be used safely by untrained persons. The
appliance can also be used in a non-domestic
environment, e.g. in a small business, as long
as it is used in the same way.
This appliance is suitable for heating domestic
hot water or for heating preheated water. The
appliance is designed for one or several draw
off point.
Any other use beyond that described shall be
deemed inappropriate. Observation of these
instructions and of instructions for any
accessories used is also part of the correct use
of this appliance.
1.2 General safety instructions
Danger of scalding
The tap can reach temperatures of
up to 55 °C. There is a risk of scalding at
outlet temperatures in excess of 43 °C.
WARNING Injury
The appliance may be used by
children aged 3 and up and persons with
reduced physical, sensory or mental
capabilities or a lack of experience and
know-how, provided that they are supervised
or they have been instructed on how to use
the appliance safely and have understood
the resulting risks. Children must never play
with the appliance. Children must never
clean the appliance or perform user mainte-
nance unless they are supervised.
DANGER Electrocution
Any damaged power cables must
be replaced by a qualified electrician. This
prevents potential hazards from arising.
Material losses
!Protect the appliance and tap against
frost.
Material losses
!In case the device is delivered as a
set with a faucet, only use the special aerator
provided. Prevent scale build-up at the tap
outlets (see chapter "Cleaning, care and
maintenance").
2. Appliance description
The electronically controlled mini instanta-
neous water heater maintains a constant outlet
temperature up to its output limit, irrespective
of the inlet temperature.
This appliance has been factory-set to the
maximum outlet temperature. Once this
temperature has been reached, the PCB
automatically reduces the output. The output
is matched to the required temperature, this
prevents the temperature being exceeded.
The appliance heats the water directly at the
draw-off point as soon as the tap is opened.
The short pipe runs ensure that energy
and water losses are minimal.
The hot water output depends on the cold
water temperature, the heating output and the
flow rate.
The bare wire heating system is suitable for
hard and soft water areas. This heating system
has a low susceptibility to scale buildup. The
heating system ensures quick and efficient
domestic hot water provision at the hand
washbasin.

STIEBEL ELTRON 7
1. Operation Instruction for the user and the qualified installer
Your qualified contractor can adjust the
maximum temperature and flow rate (see
chapter “Commissioning / Settings”).
Fitting the special aerator supplied provides an
optimum water jet.
3. Settings
The appliance heating system switches on
automatically as soon as you open the hot
water valve at the tap or activate the sensor of
a sensor tap. The water is heated. The water
temperature can be adjusted at the tap with
mixer valve:
For initial flow rate and flow rate limiting, see
chapter “Specification”.
Increasing the temperature
•Reduce the flow rate at the tap.
Reducing the temperature
•Open the tap further or add more cold water.
Following an interruption of the water supply
See chapter “Commissioning / Recommissioning”.
4. Cleaning, care and maintenance
•Never use abrasive or corrosive cleaning
agents. A damp cloth is sufficient for
cleaning the appliance.
•Check the taps/valves regularly. Limescale
deposits at the spouts can be removed using
commercially available descaling agents.
•Have the electrical safety of the appliance
regularly checked by an electrician.
•Regularly descale or replace the special
aerator (see chapter “Appliance description /
Accessories”).
5. Regulations and Provisions
- Regulations of the local power supply
company should be observed.
- Regulations of the water supply company
should observed.
- Read & study the technical data.
- Install the unit flush with the wall.
- Electrical connection to be secure.

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8
1. Operation Instruction for the user and the qualified installer
6. Troubleshooting
Problem Cause Remedy
For qualified installer / technician
The appliance will not
start despite the hot water
mixer valve being fully open.
No power to the appliance. Check the fuses in the house
installation.
The aerator in the tap is
scaled up or dirty.
Clean and/or descale the
aerator or replace the
special aerator.
The water supply has
been interrupted.
Vent the appliance and
the cold water inlet line
(see chapter "Settings").
The required temperature
is not being reached.
The maximum temperature
set inside the appliance
is too low.
Have your qualified contractor
adjust the maximum
temperature.
For end user
The appliance is at its
output limit.
Reduce the flow rate.

STIEBEL ELTRON 9
2. Installation Instruction for the qualified installer
1. Safety
Only a qualified contractor should carry out
installation, commissioning, maintenance and
repair of the appliance.
1.1 General safety instructions
We guarantee trouble-free function and op-
erational reliability only if original accessories
and spare parts intended for the appliance
are used.
Material losses
!Observe the max. permissible inlet
temperature. Higher temperatures may
damage the appliance. You can limit the
inlet temperature by means of a central
thermostatic valve (see chapter "Appliance
description / Accessories").
WARNING Electrocution
This appliance contains capacitors
which are discharged when disconnected
from the power supply. The capacitor
discharge voltage may briefly reach > 34 V
DC.
1.2 Instructions, standards and regulations
Note
Observe all applicable national and
regional regulations and instructions.
The specific electrical resistance of the water
must not fall below that stated on the type
plate. In a linked water network, factor in
the lowest electrical resistance of the water
(see chapter “Specification / Data table”).
Your water supply utility will advise you of the
specific electrical water resistance or conductivity
2. Appliance description
2.1 Standard delivery
The following are delivered with the appliance:
- Sieve inside the cold water inlet
- 2 connection hoses 1/2", 300 mm long, with
gaskets
- Company logo for oversink installation
3. Preparations
•Flush the water line thoroughly.
Water installation
A safety valve is not required.
Taps
•Use suitable taps (see chapter “Appliance
description / Accessories”).
4. Installation
4.1 Installation site
Install the appliance in a room free from the
risk of frost and near the draw-off tap.
Ensure that the lateral fixing screws for the
cover are always accessible.
The appliance is suitable for undersink instal-
lation (water connections at the top) and
oversink installation (water connections at the
bottom).
DANGER Electrocution
The adjusting screw for setting the
flow rate is 'live', and the IP25 protection is
only given when the appliance back panel
is fitted.
•Always fit the appliance back panel.

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2. Installation Instruction for the qualified installer
4.2 Installation options
4.2.1 Undersink installation
Non-pressurised, with non-pressurised tap
Pressure-tested, with pressure-tested tap
Appliance installation
Note
•Mount the appliance on the wall.
The wall must have a sufficient load-bearing
capacity.



•Undo the cover fixing screws by two turns.
•Undo the snap fastener using a screwdriver.
•Remove the appliance cover with the heater
towards the front.
•Using pliers, break out the knock-out for the
power cable in the appliance cover. Correct
the contours with a file if necessary.
• Use the appliance back panel as a drilling
template.
• Secure the appliance back panel to the wall
with suitable rawl plugs and screws.

STIEBEL ELTRON 11
2. Installation Instruction for the qualified installer

 

• Route the power cable through the cable
entry in the back panel.
• Hook in the appliance cover with the heater
at the bottom.
• Click the heater into place using the snap
fastener.
• Secure the appliance cover with the cover
fixing screws.
Tap installation
• Install the tap. For this, also observe the tap
operating and installation instructions.
Material losses
!•When making the connections,
counter the torque on the appliance using a
spanner; see chapter "Installation alterna-
tives / Undersink installation"
Pressure-tested tap
Note
•Fit the 1/2 connection hose pro-
vided.
4.2.2 Oversink installation, non-pressurised,
with nonpressurised tap
Tap installation
•Install the tap. For this, also observe the tap
operating and installation instructions.
Appliance installation
•Fit the appliance to the tap with the water
connections.
4.2.3 Connecting the power supply
DANGER Electrocution
Carry out all electrical connection
and installation work in accordance with
regulations.
DANGER Electrocution
Ensure that the appliance is earthed.
Ensure the appliance can be separated from
the power supply by an isolator that discon-
nects all poles with at least 3 mm contact
separation.
Material losses
!Take note of the type plate. The
specified voltage must match the mains
voltage.

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12
2. Installation Instruction for the qualified installer
•Connect the power cable as shown in the
wiring diagram (see chapter “Specification /
Wiring diagram”).
5. Commissioning
5.1 Initial start-up
•Fill the appliance by running the tap several
times until the pipework and appliance are
free of air.
•Carry out a tightness check.
•Insert the power cable plug, if present, into
the standard safety socket or set the fuse/
MCB.
•Check the function of the appliance.
•In the case of oversink installation, affix the
company logo supplied over the existing
company logo.
5.2 Appliance handover
•Explain the appliance function to users and
familiarise them with its operation.
•Make users aware of potential dangers,
especially the risk of scalding.
•Hand over these instructions.
5.3 Recommissioning
Material losses
!Following an interruption of the
water supply, recommission the appliance
by carrying out the following steps, in order
to prevent irreparable damage to the bare
wire heating system.
•Isolate the appliance from the power supply.
Pull the power cable plug, if present, from
the socket, or remove the fuse/reset the
MCB (Miniature Circuit Breaker in the house
installation)..
•See chapter “Initial start-up”.
5.4 Settings
You can alter the maximum flow rate and
temperature.
DANGER Electrocution
The flow rate and temperature may
only be adjusted if the appliance is isolated
from the power supply.
•Isolate all poles of the appliance from the
power supply.
DANGER Electrocution
The adjusting screw for changing the
flow rate and the potentiometer for setting
the temperature are live if the appliance has
not been isolated from the power supply.
•Remove the appliance cover.
Setting the maximum temperature
Factory setting: 50 °C

STIEBEL ELTRON 13
30°C
38°C
50°C
•Using a screwdriver, set the potentiometer to
the maximum required temperature.
•Fit the appliance cover.
Limiting the flow rate
Factory setting: Maximum flow rate
•Using the adjusting screw, set the maximum
required flow rate:
- Lowest flow rate = wind the screw in as far
as it will go.
- Highest flow rate = wind the screw out as far
as it will go.
•Fit the appliance cover.
6. Shutting down
•Isolate the ippliance from the power supply
by means of the fuse/MCB (Miniature Circuit
Breaker) in the house installation fuse box.
•Drain the appliance (see chapter “Mainte-
nance”).
2. Installation Instruction for the qualified installer

STIEBEL ELTRON
14
2. Installation Instruction for the qualified installer
7. Troubleshooting
Problem Cause Remedy
For qualified installer / technician
The appliance will not start
despite the hot water mixer
valve being fully open.
The aerator in the tap is
scaled up or dirty.
Clean and/or descale the
aerator or replace the aerator.
The flow rate is set too
low.
Increase the flow rate.
The sieve in the cold water
line is blocked.
Clean the sieve after
shutting off the cold water
inlet line.
The heater is faulty. Check the resistance of
the heating system and
replace the appliance if
required.
The safety pressure limiter
has responded..
Remedy the cause of the
fault. Isolate the appliance
from the power supply and
depressurise the water
line. Activate the safety
pressure limiter.
For end user
The required temperature
is not being reached.
The appliance operates at
its output limit.
Reduce the flow rate.

STIEBEL ELTRON 15
2. Installation Instruction for the qualified installer
LED indicators
321
1 Illuminates red in the case of a fault
2 Illuminates yellow during heating operation
3 Flashes green if the PCB is receiving power
Activating the safety pressure limiter
1
1 1-pole safety pressure limiter DEM 6
8. Maintenance
DANGER Electrocution
Before any work on the appliance,
disconnect all poles from the power supply.
8.1 Draining the appliance
DANGER Scalding
Hot water may escape during the
draining process.
If the appliance needs to be drained for main-
tenance or to protect the whole installation
when there is a risk of frost, proceed as
follows:
•Close the shut-off valve in the cold water
inlet line.
•Open the draw-off valve.
•Undo the water connections on the appliance.
8.2 Cleaning the strainer
You can clean the fitted strainer after removing
the cold water supply pipe.

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16
2. Installation Instruction for the qualified installer
8.3 Appliance storage
•Store the dismantled appliance in a room
free from the risk of frost, as water residues
remaining inside the appliance can freeze
and cause damage.
8.4 Replacing the power cable for the DEM 6
•If replacing the cable for the DEM 6, use a
power cable with 4 mm2 cross-section.
9. Specification
9.1 Dimensions and connections
95
28
30
120
143
190
4,8
165
82
20
b02
b03
c06
c01
DEM
b02 Entry electrical
cables I
b03 Entry electrical
cables II
c01 Cold water inlet Male
thread
G 1/2
c06 Hot water outlet Male
thread
G 1/2

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2. Installation Instruction for the qualified installer
9.2 Wiring diagram
L N
p >
L N
ϑ
V >
1
2
3
1 Safety pressure limiter
2 Pressure differential switch
3 PCB with outlet temperature sensor
Material losses
!•In the case of a permanent power
supply, connect the power cable according
to the designations on the socket terminals.
9.3 Application areas
For the specific electrical resistance and
specific electrical conductivity, see “Data table”.
Standard specification
at 15 °C
20 °C 25 °C
Spec. resis-
tance
ρ ≥
Spec. conductivity
σ≤
Spec.
resis-
tance
ρ ≥
Spec. conductivity
σ≤
Spec.
resis-
tance
ρ ≥
Spec. conductivity
σ≤
Ωcm mS/m μS/cm Ωcm mS/m μS/cm Ωcm mS/m μS/cm
1000 100 1000 890 112 1124 815 123 1227
1300 77 769 1175 85 815 1072 93 933

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18
2. Installation Instruction for the qualified installer
9.4 Data table
DEM 6
203769
Electrical details
Rated voltage V 220 - 240
Rated output kW 6.0 - 7.1
Rated current A 27.3 - 29.6
Recommended circuit breaker A 32
Frequency Hz 50/60
Phases 1/N/PE
Specific resistance ρ15 ≥ (at ϕcold ≤25 °C) Ω cm 1000
Specific conductivity σ15 ≤ (at ϕcold ≤25 °C) μS/cm 1000
Specific resistance ρ15 ≥ (at ϕcold ≤50 °C) Ω cm 1300
Specific conductivity σ15 ≤ (at ϕcold ≤50 °C) μS/cm 770
Max. mains impedance at 50Hz Ω 0.047
Connections
Water connection male
thread
G1/2
Application limits
Max. permissible pressure bar 10
Max. inlet temperature for reheating C 50
Values
Max. permissible inlet temperature C 55
Temperature setting range. C 30-50
ON l/min ≤2.2
OFF l/min ≥1.15
Pressure drop at flow rate MPa 0.07
Flow rate for pressure drop l/min 2.2
Flow rate limit at l/min 3.2
Hot water delivery l/min 3.2
Δϕ at hot water delivery K 25

STIEBEL ELTRON 19
2. Installation Instruction for the qualified installer
Hydraulic data
Rated capacity liter 0.1
Versions
Oversink installation X
Undersink installation X
Open vented type X
Sealed unvented type X
Protection class 1
Insulation block Plastic
Heating system heat generator Bare wire
Cap and back panel Plastic
Colour Black
IP-Rating IP25
Dimensions
Height mm 143
Width mm 190
Depth mm 82
Length of connecting cable mm 700
Weight
Weight kg 1.6
Note
The appliance conforms to IEC
61000-3-12.

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20
3. Guarantee
For guarantees please refer to the respec-
tive terms and conditions of supply for your
country.
The installation, electrical connection
and first operation of this appliance should
be carried out by a qualified installer.
The company does not accept liability
for any failure caused by improper installation
and / or unauthorized installers.
Any other use beyond that described shall be
deemed inappropriate.
Observation of these instructions and of
instructions for any accessories use is also part
of correct use of this appliance.