STIEBEL ELTRON DHC-E 12 User manual

The DHC-E series is
tested and certified by WQA
against NSF/ANSI 372 for
“lead free“ compliance.
STIEBEL ELTRON Inc.
17 West Street | West Hatfield MA 01088
Tel. [phone] | Fax [phone]
Email [e-mail]
www.stiebel-eltron-usa.com

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OPERATION
1. General information ___________________________________________ 2
1.1 Safety information__________________________________________________ 2
1.2 Other symbols in this document_________________________________ 3
2. Safety____________________________________________________________ 3
2.1 Intended use_________________________________________________________ 3
2.2 General Information________________________________________________ 3
2.3 Safety Precautions__________________________________________________ 3
2.4 Test symbols _________________________________________________________ 3
3. General __________________________________________________________ 4
4. Troubleshooting ________________________________________________ 4
INSTALLATION
5. Mounting the appliance _______________________________________ 5
5.1 Application ___________________________________________________________ 5
5.2 Mounting _____________________________________________________________ 5
5.3 Water connections__________________________________________________ 6
6. Electrical connection___________________________________________ 6
6.1 DHC-E 8/10 - Appliance with output power options _________ 6
6.2 Temperature setting/anti-scalding protection _______________ 7
7. Putting the water heater into operation_____________________ 7
7.1 Appliance handover ________________________________________________ 7
8. Troubleshooting ________________________________________________ 7
8.1 Display options LED diagnostic „traffic lights“________________ 7
8.2 Fault table____________________________________________________________ 7
9. Normal maintenance___________________________________________ 8
10. Technical Data __________________________________________________ 8
10.1 Dimensioned drawing _____________________________________________ 8
10.2 Wiring diagram _____________________________________________________ 8
10.3 Maximum temperature increase above ambient water
temperature _________________________________________________________ 9
10.4 Data table ___________________________________________________________10
11. Spare parts ____________________________________________________ 10
WARRANTY
ENVIRONMENT AND RECYCLING
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1. General information
Note
Read these instructions carefully before using the appliance
and familiarize yourself with its functions. Keep these
instructions safe. Pass on the instructions to a new user
if required.
1.1 Safety information
1.1.1 Structure of safety information
KEYWORD Type of risk
Here, possible consequences are listed that may result
from not observing the safety information.
fSteps to prevent the risk are listed.
1.1.2 Symbols. type of risk
Zź Ēù `źĤ¼ĒÏļêń÷
!Injury
Electrocution
Burns or scalding
1.1.3 Keywords
:tqHV ¼ńļêĤŒêĒĉ
DANGER If this information is not observed, it will result in serious
injury or death.
WARNING If this information is not observed, it can result in serious
injury or death.
CAUTION If this information is not observed, it can lead to medium or
minor injury.

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1.2 Other symbols in this document
Note
Notes are bordered by horizontal lines above and below
the text. General information is identified by the symbol
shown on the left.
fRead these notes carefully.
Zź Ēù
Damage to the appliance and environment
Appliance disposal
fThis symbol indicates that you have to do something. The ac-
tion you need to take is described step by step.
2. Safety
Observe the following safety information and regulations.
Operate the appliance only when fully installed and with all safety
equipment fitted.
2.1 Intended use
The appliance is intended for heating domestic hot water and can
supply several draw-off points.
Any other use beyond that described shall be deemed inappropriate.
Observation of these instructions is also part of the correct use of
this appliance.
2.2 General Information
Read this entire manual. Failure to follow all the guides, instructions
and rules could cause personal injury or property damage. Improper
installation, adjustment, alteration, service and use of this appliance
can result in serious injury.
This appliance must be installed by a licensed electrician and plumb-
er. The installation must comply with all national, state and local
plumbing and electric codes. Proper installation is the responsibility
of the installer. Failure to comply with the installation and operating
instructions or improper use voids the warranty.
Save these instructions for future reference. Installer should leave
these instructions with the consumer.
If you have any questions regarding the installation, use or opera-
tion of this water heater, or if you need any additional installation
manuals, please call our technical service line, see last side.
2.3 Safety Precautions
!
DANGER Injury
Please read and follow these instructions.
Failure to follow these instructions could result in serioius
personal injury or death.

Damage to the appliance and the environment
The appliance must be installed by a licensed electrician
and plumber. The installation must comply with all national,
state and local plumbing and electric codes.
Service of the appliance must be performed by qualified
service TECHNICIANS.
DANGER Electrocution
Before proceeding with any installation, adjustment.
alteration, or service of this appliance all circuit breakers
and disconnect switches servicing the appliance must be
turned off. Failure to do so could result in serious personal
injury or death.
DANGER Electrocution
Never remove the appliance‘s cover unless the electricity
servicing the appliance is turned off. Failure to do so could
result in personal injury or death.
DANGER Electrocution
The appliance must be properly grounded. Failure to
electrically ground the product could result in serious
personal injury or death.
DANGER Burns
Water temperatures over 125°F can cause severe burns
instantly or death from scalding. A hot water scalding
potential exists if the thermostat on the appliance is set too
high. Households with small children, disabled or elderly
persons may require that the thermostat be set at 120°F
or lower to prevent possible injury from hot water.
!
WARNING Injury
Where children or persons with limited physical, sensory
or mental capabilities are to be allowed to control this
appliance, ensure that this will only happen under
supervision or after appropriate instructions by a person
responsible for their safety.
Children should be supervised to ensure that they never
play with the appliance.
2.4 Test symbols
See type plate on the appliance.

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3. General
The tankless water heater differs from conventional storage type
water heaters in several ways. It does not store hot water. Instead,
water is heated instantaneously as it flows through the appliance.
Due to the absence of stand-by losses, the appliance offers greater
energy efficiency than storage type water heaters.
26_02_02_1086
The input of heat into the water is electronically controlled. The
appliance will deliver any water temperature between 86°F (30 °C)
and 140 °F (60 °C). Please set the desired temperature using the
knob on the front cover. In case the “Power” light is flashing while
the appliance operates, the water flow rate exceeds the heating
capacity of the appliance. Reduce the hot water flow rate in order to
let the appliance achieve the set point temperature. The maximum
temperature is electronically limited to 140 °F (60 °C). In case you
have questions regarding the way you plan to use the appliance,
please call our technical service line, see last side.
4. Troubleshooting
Zź ĤŒĒ TĒńńêù¼|şń¼ fZĒùşŒêĒĉ
No hot water circuit breaker off turn circuit breaker on
not enough flow rate to
activate appliance
clean faucet aerator or shower
head
Water not hot enough water flow too high reduce water flow rate until light
on front cover stops blinking
If you cannot remedy the fault, notify the contractor who installed
the appliance. To facilitate and speed up your enquiry, please pro-
vide the serial number from the type plate (000000-0000-000000).

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5. Mounting the appliance
5.1 Application
One appliance can be used for the following applications:
one or multiple hand washing sinks
one kitchen sink
cabins with flow restriction at shower head.
A combination of two appliance can be used for whole apartment
and house applications. Please contact STIEBEL ELTRON for special
installation instructions.
All areas with a ground water temperature likely to exceed 65°F
(18°C) year round:
Whole apartment or house
CAUTION Electrocution
Unit must be installed in a vertical position with the water
fittings pointing downward. Do not install appliance where
it would routinely be splashed with water. Electric shock
may result.
12
3
4
5
6
7
26_02_02_1082
12
3
4
5
6
7
26_02_02_1081
1 Hot valve (left)
2 Cold valve (right)
3 Sink
4 1/2“ main pipe
5 Water supply line for faucet installation
6 Shut-off valve
7 Electrical junction box
5.2 Mounting
fInstall appliance as close as possible to the main hot water
draw-off points.
fInstall appliance in a frost free area. If frost may occur, remove
appliance before freezing temperatures set in.
fLeave a minimum of 5“ of clearance on all sides for servicing.
26_02_02_1083
fRemove plastic cover.
26_02_02_033126_02_02_1090
fScrew the screws into the wall and hang the appliance. Screws
and plastic wall anchors for mounting on masonry or wood are
provided.
fSecure the screws.

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5.3 Water connections

Damage to the appliance and the environment
Excessive heat from soldering on copper pipes near the DHC
may cause damage.
fAll plumbing work must comply with national and applicable
state and local plumbing codes.
fA pressure reducing valve must be installed if the cold water
supply pressure exceeds 150 PSI (10 bar).
fMake certain that the cold water supply line has been flushed
to remove any scale and dirt.
fInstall isolating valve in cold water line as shown in illustration
“Mounting the appliance”. This allows the appliance to be iso-
lated for maintenance purposes.
fCold water connection (inlet) is on the right side of the ap-
pliance, hot water connection (outlet) is on the left side of
appliance.
fTankless water heaters such as the DHC-E are not required to
be equipped with a Pressure and Temperature Relief Valve
(P&T). If the local inspector will not pass the installation with-
out a P&T, it should be installed on the hot water outlet side of
appliance.
fThe appliance is designed for connection to copper tubing, PEX
tubing or a braided stainless steel hose with a ½“ NPT female
tapered thread. If soldering near the appliance is necessary,
please direct the flame away from the plastic housing of the
appliance in order to avoid damage.
fWhen all plumbing work is completed, check for leaks and take
corrective action before proceeding.
6. Electrical connection
DANGER Electrocution
Carry out all electrical connection and installation work in
accordance with relevant regulations.

Damage to the appliance and the environment
Observe the type plate. The specified voltage must match
the mains voltage.
DANGER Electrocution
Before beginning any work on the electric installation,
be sure that main breaker panel switch is „off“ to
avoid any danger of electric shock. All mounting and
plumbing must be completed before proceeding with
electrical hook-up. Where required by local, state or
national electrical codes the circuit should be equipped
with a „ground fault interrupter“.
DANGER Electrocution
As with any electric appliance. failure to electrically ground
appliance may result in serious injury or death.
fThe appliance should be connected to a properly grounded
dedicated branch circuit of proper voltage rating. In installa-
tions with several appliance, each appliance requires an inde-
pendent circuit. Please refer to the technical data table for the
correct wire and circuit breaker size.
26_02_02_1084
fThe wire must be fed through the rubber seal located be-
tween the hot and cold water connections. Then feed wires
through strain relief clamp and tighten clamp down on wire.
The „live“ wires must be connected to the slots on the terminal
block marked L and L. The ground wire must be connected to
slot marked with the ground symbol. Strain relief clamp with
screws and rubber seal are provided.
6.1 DHC-E 8/10 - Appliance with output power op-
tions
For the DHC-E 8/10 instantaneous water heater, the output power
is adjustable in 2 stages. In its delivered condition the appliance is
set to 7.2 kW@240 V.
1
26_02_02_1088
1 coding plug
If the appliance should be installed with a different output power,
take the following steps:
fSelect the output power:
1 = 7.2 kW @ 240 V;
2 = 9.6kW @ 240V.
fSet coding plug on the appliance according to the output power
selected. For rated current and fuse, see specification.
fMark the selected output power on the type plate with a per-
manent marker.

ENGLISH
6.2 Temperature setting/anti-scalding protection
26_02_02_1089
Connect the lead of the electronic temperature control to
position „A1“ in order to get the maximum outlet temperature
Connect the lead of the electronic temperature control to posi-
tion „A2“.
Reinstall the plastic cover.
7. Putting the water heater into opera-
tion
DANGER Electrocution
Commissioning must only be carried out by an authorised
contractor in accordance with safety regulations.
Damage to the appliance and the environment
Open hot water faucet for a few minutes until water flow
is continuous and all air is purged from water pipes. The
appliance’s plastic cover must be installed before the circuit
breaker is turned on.
Turn on circuit breaker to bring electrical power to the
appliance.
Turn the temperature selector clockwise and anti-clockwise, to
calibrate the set value transducer.
Adjust the water temperature to the desired level using the
knob on the front cover of the appliance.
Turn on hot water and wait twenty seconds until temperature
has stabilized.
Check the water temperature with your hand and make sure
that it does not feel too hot. Reduce if necessary.
Explain to the user how the appliance works and familiarise
him or her with its use.
Advise the user about possible hazards (hot water temperature
for future reference.
most applications.
7.1 Appliance handover
Explain the functions of the appliance to the user. Draw special at-
tention to the safety information. Hand the operating and installation
instructions to the user.
8. Troubleshooting
Danger of electrocution
To test the appliance, it must be supplied with power.
8.1 Display options LED diagnostic „traffic lights“
redilluminates in case of faults
yellow illuminates when the appliance is heating water
1
26_02_02_1088
1 LED diagnostic „traffic lights“
8.2 Fault table
No hot watercircuit breaker off
safety thermal cut-out
tripped
turn circuit breaker on
reset thermal cut-out
not enough flow rate to
activate appliance
clean filter screen at appliance
clean faucet aerator or shower
head
Not enough hot water filter screen clogged clean filter screen at appliance
Water not hot enough water flow too high reduce water flow rate until
light on front cover stops
blinking
supply correct voltage to
appliance
If you are not able to resolve a problem please contact us, see
last side, before removing the appliance from the wall. STIEBEL
ELTRON is happy to provide technical assistance. In most in-
stances, we can resolve the problem over the phone.
green flashing: The appliance is supplied with power

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9. Normal maintenance
STIEBEL ELTRON tankless water heaters are designed for a very long
service life. Actual life expectancy will vary with water quality and
use. The appliance itself does not require any regular maintenance.
However, to ensure consistent water flow, it is recommended to
periodically remove scale and dirt that may build up at the aerator of
the faucet(s), the filter screen in the appliance, or in the shower head.

Damage to the appliance and the environment
Other than the filter screen, the appliance does not
contain any parts serviceable by the lay person. In case
of malfunction please contact a licensed plumber or
electrician.
10. Technical Data
10.1 Dimensioned drawing
80_02_02_0007
c01 cold water connection
c06 hot water connection
b01 electrical supply cable
10.2 Wiring diagram
DHC-E 8/10
85_02_03_0001
2/GRD ~ 208 ... 240 V
DHC-E 12
85_02_03_0002
2/GRD ~ 208 ... 240 V

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10.3 Maximum temperature increase above ambient water temperature
10.3.1 Warm water flow rate [ GMP ]
q|ļ ŷ|Œ¼ļĒşŒù¼ŒŒ¼ Ĥ¼ļ|Œşļ¼ĜƃÔ³%
Cold water inlet temperature °F 39 50 59 68 77 86 95 104 113 122 131
DHC-E 8/10 5.4 kW @ 208 V 0.57 0.68 0.82 1.02 1.36 2.04 4.09 - - - -
7.2 kW @ 240 V 0.76 0.91 1.09 1.36 1.82 2.72 5.45 - - - -
7.2 kW @ 208 V 0.76 0.91 1.09 1.36 1.82 2.72 5.45 - - - -
9.6 kW @ 240 V 1.01 1.21 1.45 1.82 2.42 3.63 6.61 - - - -
DHC-E 12 9 kW @ 208 V 0.95 1.14 1.36 1.70 2.27 3.26 6.24 - - - -
12 kW @ 240 V 1.26 1.51 1.82 2.27 3.03 4.35 6.61 - - - -
q|ļ ŷ|Œ¼ļĒşŒù¼ŒŒ¼ Ĥ¼ļ|Œşļ¼ĜĜŗ³%
Cold water inlet temperature °F 39 50 59 68 77 86 95 104 113 122 131
DHC-E 8/10 5.4 kW @ 208 V 0.50 0.58 0.68 0.82 1.02 1.36 2.04 4.09 - - -
7.2 kW @ 240 V 0.66 0.78 0.91 1.09 1.36 1.82 2.72 5.45 - - -
7.2 kW @ 208 V 0.66 0.78 0.91 1.09 1.36 1.82 2.72 5.45 - - -
9.6 kW @ 240 V 0.89 1.04 1.21 1.45 1.82 2.42 3.63 6.61 - - -
DHC-E 12 9 kW @ 208 V 0.83 0.97 1.14 1.36 1.70 2.18 3.12 5.96 - - -
12 kW @ 240 V 1.11 1.30 1.51 1.82 2.27 2.90 4.16 6.61 - - -
q|ļ ŷ|Œ¼ļĒşŒù¼ŒŒ¼ Ĥ¼ļ|Œşļ¼ĜÔƃ³%
Cold water inlet temperature °F 39 50 59 68 77 86 95 104 113 122 131
DHC-E 8/10 5.4 kW @ 208 V 0.36 0.41 0.45 0.51 0.58 0.68 0.82 1.02 1.36 2.04 4.09
7.2 kW @ 240 V 0.49 0.54 0.61 0.68 0.78 0.91 1.09 1.36 1.82 2.72 5.45
7.2 kW @ 208 V 0.49 0.54 0.61 0.68 0.78 0.91 1.09 1.36 1.82 2.72 5.45
9.6 kW @ 240 V 0.65 0.73 0.81 0.91 1.04 1.21 1.45 1.82 2.42 3.63 6.61
DHC-E 12 9 kW @ 208 V 0.61 0.68 0.76 0.85 0.97 1.09 1.25 1.49 1.89 2.70 5.11
12 kW @ 240 V 0.81 0.91 1.01 1.14 1.30 1.45 1.66 1.99 2.52 3.59 6.61
10.3.2 Warm water flow rate [ l/min ]
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Cold water inlet temperature °C 4 10 15 20 25 30 35 40 45 50 55
DHC-E 8/10 5.4 kW @ 208 V 2.15 2.58 3.09 3.87 5.16 7.73 15.47 - - - -
7.2 kW @ 240 V 2.86 3.44 4.12 5.16 6.87 10.31 20.62 - - - -
7.2 kW @ 208 V 2.86 3.44 4.12 5.16 6.87 10.31 20.62 - - - -
9.6 kW @ 240 V 3.82 4.58 5.50 6.87 9.16 13.75 25.00 - - - -
DHC-E 12 9 kW @ 208 V 3.58 4.30 5.16 6.44 8.59 12.35 23.63 - - - -
12 kW @ 240 V 4.77 5.73 6.87 8.59 11.46 16.47 25.00 - - - -
q|ļ ŷ|Œ¼ļĒşŒù¼ŒŒ¼ Ĥ¼ļ|Œşļ¼ÔÑ³
Cold water inlet temperature °C 4 10 1 20 25 30 35 40 45 50 55
DHC-E 8/10 5.4 kW @ 208 V 1.89 2.21 2.58 3.09 3.87 5.16 7.73 15.47 - - -
7.2 kW @ 240 V 2.51 2.95 3.44 4.12 5.16 6.87 10.31 20.62 - - -
7.2 kW @ 208 V 2.51 2.95 3.44 4.12 5.16 6.87 10.31 20.62 - - -
9.6 kW @ 240 V 3.35 3.93 4.58 5.50 6.87 9.16 13.75 25.00 - - -
DHC-E 12 9 kW @ 208 V 3.14 3.68 4.30 5.16 6.44 8.23 11.81 22.55 - - -
12 kW @ 240 V 4.19 4.91 5.73 6.87 8.59 10.98 15.75 25.00 - - -
q|ļ ŷ|Œ¼ļĒşŒù¼ŒŒ¼ Ĥ¼ļ|Œşļ¼ōƃ³
Cold water inlet temperature °C 4 10 15 20 25 30 35 40 45 50 55
DHC-E 8/10 5.4 kW @ 208 V 1.38 1.55 1.72 1.93 2.21 2.58 3.09 3.87 5.16 7.73 15.47
7.2 kW @ 240 V 1.84 2.06 2.29 2.58 2.95 3.44 4.12 5.16 6.87 10.31 20.62
7.2 kW @ 208 V 1.84 2.06 2.29 2.58 2.95 3.44 4.12 5.16 6.87 10.31 20.62
9.6 kW @ 240 V 2.45 2.75 3.05 3.44 3.93 4.58 5.50 6.87 9.16 13.75 25.00
DHC-E 12 9 kW @ 208 V 2.30 2.58 2.86 3.22 3.68 4.12 4.73 5.64 7.16 10.20 19.33
12 kW @ 240 V 3.07 3.44 3.82 4.30 4.91 5.49 6.30 7.52 9.55 13.60 25.00

10.4 Data table
Part number 224201 230628
Phase 1 1 1 1 1 1 1 1 1 1 1 1
Voltage V 208 220 230 240 208 220 230 240 208 220 230 240
Coding plug Position 1 1 1 1 2 2 2 2 - - - -
Output power kW 5.4 6.0 6.6 7.2 7.2 8.1 8.8 9.6 9 10 11 12
Ampere A 28 30 31 32 35 37 39 40 44 46 48 50
Min. required circuit breaker size A 40 40 40 40 50 50 50 50 60 60 60 60
Rocommended wire size AWG COPPER 10 - - 8 8 - - 8 6 - - 6
Rocommended wire size mm² - 6 6 - - 10 10 - - 10 10 -
Protection level IP 24 IP 24
Min. water flow to activate appliance GPM / l/min 0.37 / 1.4 0.37 / 1.4
Nominal water volume GAL / l 0.13 / 0.5 0.13 / 0.5
Working pressure max. PSI / bar 150 / 10 150 / 10
Tested to pressure PSI / bar 300 / 20 300 / 20
Weight lbs. / kg 5.9 / 2.7 5.9 / 2.7
Water connections 1/2“ NPT 1/2“ NPT
Suitable for supply with up to 131 °F / 55 °C
Tankless water heaters are considered a non-continuous load
11. Spare parts
2
1
13
6
3 5
10
11
15
14
9 8 7
12
26_02_02_1091
4
1 Heating system 292575 292576
2 Safety thermal cut out 286369 286369
3 Electronic control appliance 291851 291852
4 Coding plug 283455 ---
5 Back panel 292578 292578
6 Flow sensor DFE 286461 286461
7 Cold water connection 291699 291699
8 Filter screen 275981 275981
9 Hot water connection 278634 278634
10 Plastic cover 292577 292577
11 Wiring block 279998 279998
12 Axis connection plug 254312 254312
13 Electronic temperature control 286359 286359
14 Temperature adjustment knob 254307 254307
15 Outlet temperature sensor 280677 280677