STIEBEL ELTRON CK 15E User manual

OPERATION AND INSTALLATION

UTILISATION ET INSTALLATION

OPERACIÓN E INSTALACIÓN

Fan heater | Calentador con ventilador | Convecteurs soufants

» CK 15 E

» CK 20 E

» CKT 15 E

» CKT 20 E

Conforms to ANSI/UL Std. 2021

Certiﬁed to CAN/CSA Std. 22.2 No. 46

Conforme a ANSI/UL Std. 2021

Certiﬁcación con CAN/CSA Std. 22.2 No. 46

Conforme à la norme ANSI/UL Std. 2021

Certiﬁé à la norme CAN/CSA Std. 22.2 No. 46

STIEBEL ELTRON, Inc.

17 West Street | West Hatﬁeld, MA 01088

Tel. 413-247-3380 | Fax 413-247-3369

Email info

@

stiebel-eltron-usa.com

www.stiebel-eltron-usa.com

2 | CK 15-20 E / CKT 15-20 E WWW.STIEBEL-ELTRON-USA.COM

CONTENTS | OPERATION

IMPORTANT INSTRUCTIONS

OPERATION

1. Important Instructions ��2

1.1 Document information �� 2

1.2 Safety information �� 2

1.3 Other symbols in this document �� 3

2. Safety �� 3

2.1 Intended use �� 3

2.2 Safety information �� 3

2.3 Licences / certiﬁcates �� 4

2.4 Test symbols �� 4

3. Register your product ��4

4. Appliance description ��4

4.1 Control with external room temp. controller �� 4

5. Operation CK 15 E / CK 20 E ��4

5.1 Starting heating �� 4

5.2 Stopping heating / frost protection �� 4

6. Operation CKT 15 E / CKT 20 E ��4

6.1 Starting heating �� 5

6.2 Adjusting the time switch �� 5

6.3 Stopping heating / frost protection �� 5

7. Cleaning, care and maintenance ��5

8. Storage ��5

9. Troubleshooting ��5

INSTALLATION

10. Safety �� 5

10.1 General safety information �� 5

10.2 Instructions, standards and regulations �� 5

11. Appliance description ��5

11.1 Standard delivery �� 5

12. Installation ��5

13. Electrical connection ��6

13.1 Removing the front cover �� 6

13.2 Routing wire to the terminal block �� 6

13.3 Terminal block �� 6

14. Appliance handover ��6

15. Speciﬁcation ��7

15.1 Dimensions �� 7

15.2 Minimum clearances to hard surfaces �� 7

15.3 Speciﬁcation table �� 8

15.4 Wiring diagram CK 15 E �� 8

15.5 Wiring diagram CKT 15 E �� 9

15.6 Wiring diagram CK 20 E �� 9

15.7 Wiring diagram CKT 20 E �� 10

16. Warranty �� 11

OPERATION

1. Important Instructions

SAVE THESE INSTRUCTIONS

When using electrical appliances, basic precautions should always

be followed to reduce the risk of ﬁre, electric shock, and injury to

persons, including the following:

1. Read all instructions before installing or using this heater.

2. This heater is hot when in use. To avoid burns, do not let bare

skin touch hot surfaces. Keep combustible materials, such as fur-

niture, pillows, bedding, papers, clothes, etc. and curtains at least

3 feet (1 m) from the front of the heater and keep them at least 3

feet (1 m) away from the sides and rear.

3. Extreme caution is necessary when any heater is used by or

near children or invalids and whenever the heater is left operating

and unattended.

4. Do not operate any heater after it malfunctions. Disconnect

power at service panel and have heater inspected by a reputable

electrician before reusing.

1.1 Document information

The chapter Operation is intended for users and heating contrac-

tors.

The chapter Installation is intended for heating contractors.

Note

Read these instructions carefully before using the ap-

pliance and familiarize yourself with its functions. Keep

these instructions safe. Pass on the instructions to a new

user if required.

1.2 Safety information

1.2.1 Structure of safety information

KEYWORD Type of risk

Here, possible consequences are listed that may result

from not observing the safety information.

f Steps to prevent the risk are listed.

OPERATION

SAFETY

ENGLISH

WWW.STIEBEL-ELTRON-USA.COM CK 15-20 E / CKT 15-20 E| 3

1.2.2 Symbols, type of risk

Symbol Type of risk

!

Injury

Electrocution

Burns or scalding

Fire

1.2.3 Keywords

KEYWORD Description

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.

1.3 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.

f Read these notes carefully.

Symbol

!

Damage to the appliance and environment

Appliance disposal

Never cover the appliance

f This 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

This appliance is designed to heat living areas.

Any other use beyond that described shall be deemed inappropri-

ate. Observation of these instructions is also part of the correct

use of this appliance. Any modiﬁcations or conversions to the

appliance void all warranty rights.

2.2 Safety information

Operate the appliance only when fully installed and with all safety

equipment ﬁtted.

The heater must be properly installed before it is used.

DANGER Electrocution

- Before cleaning, make sure the power has been

turned off at the circuit breaker panel and that the

heating element of the heater is cool.

DANGER Fire

Never operate this appliance ...

- if the minimum clearances to adjacent object sur-

faces are not maintained, for example to furniture,

net curtains, curtains, textiles or other ﬂammable

materials (for minimum clearances, see "speciﬁca-

tion/dimensions and minimum clearances").

- in rooms where the appliance is at risk from ﬁre or

explosion as a result of chemicals, dust, gases or

vapors.

- in the direct proximity of pipes or containers that

carry or contain ﬂammable or explosive materials.

- if work such as laying cables, grinding or sealing is

carried out in the installation room.

- if sprays, ﬂoor polish or similar products containing

gasoline are used. Vent the room sufﬁciently before

heating.

- if an appliance component is damaged, the appli-

ance has fallen over or already had a fault.

- outdoors.

DANGER Fire

Never place any ﬂammable, combustible or insulating

objects or materials, such as laundry, blankets, maga-

zines, containers with ﬂoor polish or gasoline, spray cans

or similar on the appliance or in direct proximity to it.

WARNING Fire

Ensure that no foreign bodies enter the ventilation air

and extract air apertures. This could result in electric

shock or ﬁre or in damage to the appliance.

WARNING Fire

To prevent ﬁres ensure that the air inlets and outlets are

never blocked. Never position the appliance on soft sur-

faces, such as a bed, as this could result in the apertures

becoming blocked.

DANGER Overheating

The appliance could continue to heat the room unchecked

if it is operated on a time switch. Ensure constant su-

pervision if the appliance is used in a small room and

the persons within that room cannot leave the room on

their own.

!

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 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.

OPERATION

REGISTER YOUR PRODUCT

4 | CK 15-20 E / CKT 15-20 E WWW.STIEBEL-ELTRON-USA.COM

CAUTION Burns

The casing surfaces of the appliance and the expelled

air become hot during use (above 90 °C (194 °F)). To pre-

vent burns ensure that the hot surfaces never come into

contact with bare skin.

!

Damage to the appliance and the environment

- Never cover this appliance.

- Never step on the appliance.

2.3 Licences / certiﬁcates

- UL (U.S.A) Std. 2021

- CSA (Canada) Std. 22.2 No. 46

2.4 Test symbols

See type plate on the appliance.

3. Register your product

You must register this product within 90 days of

purchase on our web site in order to activate the

standard warranty or to be eligible for the extended

warranty. Go to our web site at

www.stiebel-eltron-usa.com and click on register

your product.

Before beginning the registration process, we suggest that

you gather the necessary information which will be as

follows:

Type, Example: CK 15 E (from the white label that is on the

right side of the unit)

Number listed after “Nr.”

Place of Purchase

Purchase Date

First & Last Name

Email address

Physical Address

Phone Number

IF YOU HAVE ANY QUESTIONS CONCERNING THE REGISTRA-

TION PROCESS OR WARRANTY OPTIONS, PLEASE CONTACT

STIEBEL ELTRON USA DIRECTLY AT (800)-582-8423.

4. Appliance description

This appliance is wall mounted and is particularly suitable for work

rooms, kitchens, bathrooms, wash rooms and similar.

The external casing of the appliance is made from stove enameled

sheet steel. The sides are made out of plastic. The controls are

located on the right side panel.

The quiet fan draws in the ambient air that is heated by a bare wire

heater element. The air then exits evenly through the hot air chan-

nel and the air outlet grille set into the bottom of the appliance.

The appliance heats up the ambient air inside the room and main-

tains it at the selected temperature.

4.1 Control with external room temp. controller

(Only applicable for: CK)

In rooms larger than 215 ft

2

(20 m

2

) you can operate the appliance

with a conventional wall mounted room thermostat.

f To do so, turn the temperature selector fully clockwise.

f Control the temperature by using the wall thermostat.

5. Operation CK 15 E / CK 20 E

1

26�07�31�0211

1 Temperature selector

5.1 Starting heating

The temperature is inﬁnitely adjustable. The appliance stops heat-

ing as soon as the selected room temperature has been reached.

f Turn the temperature selector clockwise to the required

setting.

5.2 Stopping heating / frost protection

!

To ensure frost protection, the power switch must be

in the on position.

f Turn the temperature selector fully counter clockwise.

This position ensures frost protection. The heater starts automati-

cally if the room temperature drops below the frost protection

temperature.

6. Operation CKT 15 E / CKT 20 E

1

2

26�07�31�0214

1 Temperature selector

2 Timer

OPERATION

CLEANING, CARE AND MAINTENANCE

ENGLISH

WWW.STIEBEL-ELTRON-USA.COM CK 15-20 E / CKT 15-20 E| 5

6.1 Starting heating

The temperature is inﬁnitely adjustable. The appliance stops heat-

ing as soon as the selected room temperature has been reached.

f Turn the temperature selector clockwise to the required

setting.

6.2 Adjusting the time switch

With the time switch, the appliance heats with full output and

without temperature control.

f Turn the Timer clockwise to set any number of minutes to

count down from 0-60minutes.

6.3 Stopping heating / frost protection

This position ensures frost protection. The heater starts automati-

cally if the room temperature drops below the frost protection

temperature.

f Turn the temperature selector fully counter clockwise and

ensure that the time switch is set to "0".

7. Cleaning, care and maintenance

The appliance contains no user serviceable parts.

Clean the appliance when cold with ordinary cleaning products.

Avoid abrasive or corrosive cleaning products.

If a pale brownish discoloration appears on the appliance casing,

wipe this off as soon as possible with a damp cloth.

!

Damage to the appliance and the environment

Never spray cleaning spray into the air slot.

8. Storage

f When not in use, keep the appliance in a dry place.

9. Troubleshooting

If the appliance does not heat, check the temperature set at the

appliance and the circuit breacker.

The appliance has a safety high limit that shuts the appliance down

if it overheats. After the cause has been removed (for example air

outlet or inlet apertures covered) and the appliance has cooled

down for a few minutes, operation starts again.

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).

INSTALLATION

10. Safety

Only licensed electricians should carry out the maintenance and

repair of this appliance.

10.1 General safety information

We guarantee trouble-free operation and operational reliability

only if the original accessories and spare parts intended for the

appliance are used.

10.2 Instructions, standards and regulations

Note

Observe all applicable national and local regulations and

instructions.

11. Appliance description

This appliance is a wall mounted electric heater. It is particularly

suitable for heating rooms, such as work rooms, kitchens, bath-

rooms, wash rooms etc.

11.1 Standard delivery

- Wall mount bracket

- Bottom bracket

12. Installation

DANGER Electrocution

- If installing the appliance in rooms with a bath and/

or shower, take the relevant safety zone into ac-

count in accordance with the information on the ap-

pliance type plate.

- Install the appliance in such a way that switching

and control equipment cannot be touched by a per-

son in the bath or shower.

DANGER Fire

- Only ﬁt the appliance to a vertical wall that is heat-

resistant to at least194°F(90 °C).

- Maintain minimum clearances to adjacent surfaces.

- Never install the appliance directly below a wall

socket.

f Check the hole distances for the wall mounting bracket in the

dimensioned drawing.

f Secure the wall mounting bracket with suitable fasteners.

The horizontal and vertical slots in the wall mounting bracket

enable alignment if drilled holes are not completely accurate.

f Hook in the appliance so that both top protrusions are in-

serted into the slots in the wall mounting bracket.

6 | CK 15-20 E / CKT 15-20 E WWW.STIEBEL-ELTRON-USA.COM

INSTALLATION

ELECTRICAL CONNECTION

f Secure the appliance with the bottom bracket and one screw

against unintentional unhooking. To do so, hook the bottom

bracket from the back into the rear panel.

13. 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.

Never install the appliance directly below an outlet.

In case of ROMEX wire, install ½" ROMEX connector in knockout.

In case of Greenﬁeld, please use ½" Greenﬁeld connector.

13.1 Removing the front cover

Remove the two screws at the bottom of the unit. Once removed,

the front face can be removed by pulling it towards you.

1

1 Screw locations for removing cover

13.2 Routing wire to the terminal block

There is a hole for cable entry in the back of the unit. Install a

cable clamp to prevent the power cable from being pulled out of

the terminal block during operation.

1

1 Cable entry

13.3 Terminal block

Route the power cable through the cable entry hole and into the

terminal block. The ground wire screw is located above the ter-

minal block.

1

1 Terminal block

Consult the chart below for the recommended torque amounts on

the terminal block screws.

Screw Size (mm) Min. Torque (N•cm) Min. Torque (lbf•in)

M3.5 60-80 5.31-7.08

Using the proper torque speciﬁcations to secure wire to the wiring

block helps to avoid personal loss or property damage.

14. Appliance handover

Explain the functions of the appliance to the user. Draw special

attention to the safety information. Hand the operating and instal-

lation instructions to the user.

ENGLISH

WWW.STIEBEL-ELTRON-USA.COM CK 15-20 E / CKT 15-20 E| 7

INSTALLATION

SPECIFICATION

15. Speciﬁcation

15.1 Dimensions

1

3

2

18˝

(46 cm)

⅜˝ (1 cm)

5˝ (12.3 cm)

13½˝ (33.5 cm)

8˝ (20 cm)

14¼˝

(36.5 cm)

17˝

(43.1 cm)

1

3

2

18˝

(46 cm)

⅜˝ (1 cm)

5˝ (12.3 cm)

13½˝ (33.5 cm)

8˝ (20 cm)

14¼˝

(36.5 cm)

17˝

(43.1 cm)

1 Wall mounting bracket

2 Cable entry

3 Bottom bracket

15.2 Minimum clearances to hard surfaces

minimum

4˝ (10 cm)

minimum

4˝ (10 cm)

minimum 4˝ (10 cm) recommended 6-8˝ (15-20 cm)

FLOOR

minimum 12˝ (30.5 cm)

minimum

20˝ (50 cm)

ANY HARD SURFACE

minimum

4˝ (10 cm)

minimum

4˝ (10 cm)

minimum 4˝ (10 cm) recommended 6-8˝ (15-20 cm)

FLOOR

minimum 12˝ (30.5 cm)

minimum

20˝ (50 cm)

ANY HARD SURFACE

f The images above show minimum allowed clearances be-

tween the installed appliance and any hard surfaces.

f We recommend installing the appliance 6-8˝ off the floor.

WARNING Fire

Combustible materials such as furniture, papers, clothes

and curtains must be kept at least 3 feet (0.9 m) from

the heater.

Never place any ﬂammable, combustible or insulating

objects or materials, such as laundry, blankets,

magazines, containers with ﬂoor polish or gasoline,

spray cans or similar on the appliance or in direct

proximity to it.

8 | CK 15-20 E / CKT 15-20 E WWW.STIEBEL-ELTRON-USA.COM

INSTALLATION

SPECIFICATION

15.3 Speciﬁcation table

CK 15 E CK 20 E

Part number 074058 074057

Power supply single phase single phase

Voltage 120 V 240 V 208 V

Wattage 1500 W 2000 W 1500 W

Amperage 12.5 A 8.3 A 7.5 A

Required circuit breaker size 15 A 15 A 15 A

Required wire size 14 AWG 14 AWG 14 AWG

Temperature range 41°F - 86°F / 5°C - 30°C

Frost protection setting 44.6°F / 7°C

Operating noise 49.7 dB(A)

Height 18.1˝ / 46 cm

Width 13.2˝ / 33.5 cm

Depth 4.8˝ / 12.3 cm

Weight 8.0 lb / 4.4 kg

CKT 15 E CKT 20 E

Part number 230345 230346

Power supply single phase single phase

Voltage 120 V 240 V 208 V

Wattage 1500 W 2000 W 1500 W

Amperage 12.5 A 8.3 A 7.5 A

Required circuit breaker size 15 A 15 A 15 A

Required wire size 14 AWG 14 AWG 14 AWG

Temperature range 41°F - 86°F / 5°C - 30°C

Frost protection setting 44.6°F / 7°C

Operating noise 49.7 dB(A)

Height 18.1˝ / 46 cm

Width 13.2˝ / 33.5 cm

Depth 4.8˝ / 12.3 cm

Weight 8.0 lb / 4.4 kg

15.4 Wiring diagram CK 15 E

GRD L1 N

CK 15 E:

M1

M

1

~

ϑ

>

N1

1

2

X1

R1 R2

A1

>80°C ± 5K

>171°F ± 9°F

F1

F2

ϑ

CK �15� SP�TS

A1 Electric heating element assembly

F1 Temperature high limit

M1 Fan

N1 Thermostat

R1 Heating resistor

R2 Heating resistor

X1 Wiring block

ENGLISH

WWW.STIEBEL-ELTRON-USA.COM CK 15-20 E / CKT 15-20 E| 9

INSTALLATION

SPECIFICATION

15.5 Wiring diagram CKT 15 E

1

2

1

3

2

ϑ

>

N1

R1 R2

M1

M

1

~

A1

T1

GRD L1 N

CKT 15 E:

X1

>80°C ± 5K

>171°F ± 9°F

F1

F2

ϑ

CKT�15�SP�TS

A1 Electric heating element assembly

F1 Temperature high limit

M1 Fan

N1 Thermostat

R1 Heating resistor

R2 Heating resistor

T1 60 minute timer

X1 Wiring block

15.6 Wiring diagram CK 20 E

GRD L1 L2

CK 20 E:

M1

M

1

~

ϑ

>

N1

1

2

X1

R1 R2

A1

>80°C ± 5K

>171°F ± 9°F

F1

F2

ϑ

CK�20�DP�TS

A1 Electric heating element assembly

F1 Temperature high Limit

M1 Fan

N1 Thermostat

R1 Heating resistor

R2 Heating resistor

X1 Wiring block

10 | CK 15-20 E / CKT 15-20 E WWW.STIEBEL-ELTRON-USA.COM

INSTALLATION

SPECIFICATION

15.7 Wiring diagram CKT 20 E

1

2

1

3

2

4

6

5

ϑ

>

N1

R1 R2

M1

M

1

~

A1

T1

GRD L1 L2

CKT 20 E:

X1

>80°C ± 5K

>171°F ± 9°F

F1

F2

ϑ

S1

CKT�20�DP�TS

A1 Electric heating element assembly

F1 Temperature high Limit

M1 Fan

N1 Thermostat

R1 Heating resistor

R2 Heating resistor

S1 Dual-pole on/off switch

T1 60 minute timer

X1 Wiring block

ENGLISH

WWW.STIEBEL-ELTRON-USA.COM CK 15-20 E / CKT 15-20 E| 11

WARRANTY | ENVIRONMENT AND RECYCLING

Simply the Best

17 West Street

West Hatﬁ eld, MA 01088

TOLL FREE 800.582.8423

PHONE 413.247.3380

FAX 413.247.3369

info

@

stiebel-eltron-usa.com

www.stiebel-eltron-usa.com

ELECTRIC SPACE HEATERS

All CK, CKT, CK Trend, CNS-E & CNS 24H models

LIMITED WARRANTY

Subject to the terms and conditions set forth in this limited

warranty, Stiebel Eltron, Inc. (the “Manufacturer”) hereby

warrants to the original purchaser (the “Owner”) that

each Electric Space Heater (the “Heater”) shall be free of

defects in the Manufacturer’s materials or workmanship

for a period of three (3) years from the date of purchase.

As Owner’s sole and exclusive remedy for breach of the

above warranty, Manufacturer shall, at the Manufacturer’s

discretion, send replacement parts for local repair; retrieve

the unit for factory repair, or replace the defective Heater

with a replacement unit with comparable operating

features. Manufacturer’s maximum liability under all

circumstances shall be limited to the Owner’s purchase

price for the Heater.

This limited warranty shall be the exclusive warranty

made by the Manufacturer and is made in lieu of all other

warranties, express or implied, whether written or oral,

including, but not limited to warranties of merchantability

and ﬁ tness for a particular purpose. Manufacturer shall

not be liable for incidental, consequential or contingent

damages or expenses arising directly or indirectly from any

defect in the Heater or the use of the Heater. Manufacturer

shall not be liable for any damage to property of Owner

arising, directly or indirectly, from any defect in the Heater

or the use of the Heater. Manufacturer alone is authorized

to make all warranties on Manufacturer’s behalf and no

statement, warranty or guarantee made by any other party

shall be binding on Manufacturer.

Manufacturer shall not be liable for any damage

whatsoever relating to or caused by:

1. any misuse or neglect of the Heater, any accident to

the Heater, any alteration of the Heater, or any other

unintended use;

2. acts of God and circumstances over

which Manufacturer has no control;

3. installation of the Heater other than as directed by

Manufacturer and other than in accordance with

applicable building codes;

4. failure to maintain the Heater or to operate the Heater

in accordance with the Manufacturer’s speciﬁ cations;

5. improper installation and/or improper materials used

by any installer and not relating to defects in parts or

workmanship of Manufacturer;

6.

moving the Heater from its original place of installation;

7. use on improper voltage or current;

8.

disassembly, repair, or alteration by anyone other than

the manufacturer.

Should owner wish to return the Heater to manufacturer

for repair or replacement under this warranty, Owner

must ﬁ rst secure written authorization from Manufacturer.

Owner shall demonstrate proof of purchase, including a

purchase date, and shall be responsible for all removal

and transportation costs. If Owner cannot demonstrate a

purchase date this warranty shall be limited to the period

beginning from the date of manufacture stamped on the

Heater. Manufacturer reserves the right to deny warranty

coverage upon Manufacturer’s examination of Heater.

This warranty is restricted to the Owner and cannot be

assigned.

Some States and Provinces do not allow the exclusion

or limitation of certain warranties. In such cases, the

limitations set forth herein may not apply to the Owner. In

such cases this warranty shall be limited to the shortest

period and lowest damage amounts allowed by law. This

warranty gives you speciﬁ c legal rights and you may also

have other rights which vary from State to State or Province

to Province.

Owner shall be responsible for all labor and other charges

incurred in the removal or repair of the Heater in the ﬁ eld.

This Warranty is valid for U.S.A. & Canada only. Warranties

may vary by country. Please consult your local Stiebel Eltron

Representative for the Warranty for your country.

This Warranty is valid for U.S.A. & Canada only. Warranties

may vary by country. Please consult your local Stiebel Eltron

Representative for the Warranty for your country.

!

The installation, electrical connection and ﬁrst operati-

on of this appliance should be carried out by a qualiﬁed

installer.

!

The company does not accept liability for failure of any

goods supplied which have not been installed and ope-

rated in accordance with the manufacturer‘s

instructions.

Environment and recycling

Please help us to protect the environment by disposing of the

packaging in accordance with the national regulations for waste

processing.

16. Warranty

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Subject to errors and technical changes!

STIEBEL ELTRON, Inc.

17 West Street | West Hatﬁeld MA 01088

Tel. 413-247-3380 | Fax 413-247-3369

[email protected]

www.stiebel-eltron-usa.com

4<AMHCMM=gehfdb>

North, Central and South America

United States of America

A 164753-40474-9330

STIEBEL ELTRON CK 15E User manual

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