STIEBEL ELTRON PEO 18/21/24 Operation Instruction

OPERATION AND INSTALLATION

OPERACIÓN E INSTALACIÓN

OBSLUHA A INSTALACE

OBSŁUGA I INSTALACJA

РАКУВАЊЕ И ИНСТАЛАЦИЈА

ЭКСПЛУАТАЦИЯ И УСТАНОВКА

Electronically controlled comfort instantaneous water heater | Calentador instantáneo de confort

con regulación electrónica | Elektronicky regulovaný komfortní průtokový ohřívač| Elektronicznie

regulowany komfortowy przepływowy ogrzewacz wody | Електронски регулиран удобен проточен

бојлер | Проточный водонагреватель повышенной комфортности с электронной системой

регулирования

» PEO 18/21/24

» PEO 27

Made in Germany

2 | PEO 18/21/24 | PEO 27 www.stiebel-eltron.com

CONTENTS | SPECIAL INFORMATION

SPECIAL INFORMATION

OPERATION

1. General information ��3

1.1 Safety instructions �� 3

1.2 Other symbols in this documentation �� 4

1.3 Units of measurement �� 4

2. Safety �� 4

2.1 Intended use �� 4

2.2 General safety instructions �� 4

3. Appliance description ��4

4. Settings ��5

4.1 Recommended settings �� 5

5. Cleaning, care and maintenance ��5

6. Troubleshooting ��5

INSTALLATION

7. Safety �� 6

7.1 General safety instructions �� 6

7.2 Shower operation�� 6

7.3 Instructions, standards and regulations �� 6

8. Appliance description ��6

8.1 Standard delivery �� 6

9. Preparation ��6

9.1 Installation location �� 6

9.2 Water installation �� 7

10. Installation ��7

10.1 Standard installation �� 7

10.2 Alternative installation methods�� 10

10.3 Completing the installation �� 12

11. Commissioning �� 12

11.1 Initial start-up �� 12

11.2 Recommissioning �� 13

12. Appliance shutdown �� 13

13. Troubleshooting �� 13

13.1 Operation with preheated water �� 13

14. Maintenance �� 14

15. Speciﬁcation �� 14

15.1 Dimensions and connections �� 14

15.2 Wiring diagram �� 15

15.3 DHW output �� 15

15.4 Application areas/ Conversion table �� 15

15.5 Pressure drop �� 15

15.6 Fault conditions ��15

15.7 Test symbols �� 15

15.8 Energy consumption data �� 16

15.9 Data table �� 16

GUARANTEE

ENVIRONMENT AND RECYCLING

SPECIAL INFORMATION

- The appliance may be used by children aged3

and older and persons with reduced physical,

sensory or mental capabilities or a lack of ex-

perience and know-how, provided that they

are supervised or they have been instructed

on how to use the appliance safely and have

understood the potential 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

60°C. There is a risk of scalding at outlet tem-

peratures in excess of 43°C.

- The appliance is suitable for supplying a

shower (shower operation). If the appliance

is also or exclusively used for shower oper-

ation, the qualiﬁed contractor must activate

the temperature setting range using the

temperature limit (Tred = 55°C) in the appli-

ance. When using preheated water, it must be

ensured that the inlet temperature does not

exceed 55°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 power

supply.

- The appliance must be connected to the earth

conductor.

- The appliance must be permanently connect-

ed to ﬁxed wiring.

- Secure the appliance as described in chapter

"Installation/ Installation".

- Observe the maximum permissible pressure

(see chapter "Installation/ Speciﬁcation/ Data

table").

- The speciﬁc water resistivity of the mains

water supply must not be undershot (see

chapter "Installation/ Speciﬁcation/ Data

table").

OPERATION

General information

ENGLISH

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- Drain the appliance as described in chapter

"Installation/ Maintenance/ Draining the

appliance".

OPERATION

1. General information

The chapters "Special information" and "Operation" are intended

for both users and qualiﬁed contractors.

The chapter "Installation" is intended for qualiﬁed contractors.

Note

Read these instructions carefully before using the appli-

ance and retain them for future reference.

Pass on the instructions to a new user if required.

1.1 Safety instructions

1.1.1 Structure of safety instructions

!

KEYWORD Type of risk

Here, possible consequences are listed that may result

from failure to observe the safety instructions.

 Steps to prevent the risk are listed.

1.1.2 Symbols, type of risk

Symbol Type of risk

Injury

Electrocution

Burns

(burns, scalding)

1.1.3 Keywords

KEYWORD Meaning

DANGER Failure to observe this information will result in serious

injury or death.

WARNING Failure to observe this information may result in serious

injury or death.

CAUTION Failure to observe this information may result in non-seri-

ous or minor injury.

!

OPERATION

Safety

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1.2 Other symbols in this documentation

Note

General information is identiﬁed by the adjacent symbol.

 Read these texts carefully.

Symbol Meaning

Material losses

(appliance damage, consequential losses and environmen-

tal pollution)

Appliance disposal

 This symbol indicates that you have to do something. The ac-

tion you need to take is described step by step.

1.3 Units of measurement

Note

All measurements are given in mm unless stated oth-

erwise.

2. Safety

2.1 Intended use

The appliance is intended for domestic use. It can be used safely

by untrained persons. The appliance can also be used in non-do-

mestic environments, e.g.in small businesses, as long as it is

used in the same way.

This pressurised appliance is suitable for heating domestic hot

water or for reheating preheated water. The appliance can supply

one or more draw-off points.

Any other use beyond that described shall be deemed inappro-

priate. Observation of these instructions and of the instructions

for any accessories used is also part of the correct use of this

appliance.

2.2 General safety instructions

CAUTION Burns

The tap can reach temperatures of up to 60°C. There is a

risk of scalding at outlet temperatures in excess of 43°C.

CAUTION Burns

If operating with preheated water, e.g. from a solar ther-

mal system, the DHW temperature may vary from the

selected set temperature.

!

WARNING Injury

The appliance may be used by children aged3 and older

and persons with reduced physical, sensory or mental

capabilities or a lack of experience and know-how, pro-

vided that they are supervised or they have been in-

structed on how to use the appliance safely and have

understood the potential risks. Children must never play

with the appliance. Children must never clean the ap-

pliance or perform user maintenance unless they are

supervised.

Where children or persons with limited physical, sensory or men-

tal abilities are allowed to use this appliance, we recommend a

permanent temperature limit. A qualiﬁed contractor can set the

limit for you.

!

Material losses

The user should protect the appliance and its tap against

frost.

3. Appliance description

The electronically controlled instantaneous water heater with au-

tomatic output matching keeps the outlet temperature constant

up to the output limit. The temperature is then adjusted via the

draw-off tap.

Heating system

The bare wire heating system has a pressure-tested plastic cas-

ing. The heating system is suitable for hard and soft water areas

and is largely insusceptible to scale build-up. This heating system

ensures rapid and efﬁcient DHW availability.

Note

The appliance is equipped with an air detector that large-

ly prevents damage to the heating system. If, during op-

eration, air is drawn into the appliance, the appliance

shuts down for one minute, thereby protecting the heat-

ing system.

!

OPERATION

Settings

ENGLISH

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4. Settings

The DHW outlet temperature can be variably adjusted. The se-

lected temperature is displayed. At temperatures over 43°C, the

colour of the display changes from blue to red to indicate a risk

of scalding.

D0000041609

 Turn the temperature selector to the required temperature.

Note

If the outlet temperature is not sufﬁciently high when the

draw-off valve is fully open and the temperature selector

is set to maximum, then more water is ﬂowing through

the appliance than can be heated by the heating system

(appliance is at its output limit).

 Reduce the water volume at the draw-off valve.

4.1 Recommended settings

Thermostatic valve

Your instantaneous water heater offers maximum precision and

maximum convenience in DHW provision. Should you nonetheless

be operating the appliance with a thermostatic valve, we recom-

mend that you:

 Adjust the set temperature on the appliance to over 50°C.

Then set the required set temperature on the thermostatic

valve.

Following an interruption to the water supply

!

Material losses

To ensure that the bare wire heating system is not dam-

aged following an interruption to the water supply, the

appliance must be restarted by taking the following steps.

 Disconnect the appliance from the power supply by

removing the fuses/tripping the MCBs.

 Open the tap for one minute until the appliance and

its upstream cold water inlet line are free of air.

 Switch the mains power back on again.

5. Cleaning, care and maintenance

 Never use abrasive or corrosive cleaning agents. A damp

cloth is sufﬁcient for cleaning the appliance.

 Check the taps regularly. Limescale deposits at the tap out-

lets can be removed using commercially available descaling

agents.

6. Troubleshooting

Problem Cause Remedy

The appliance will not

start despite the DHW

valve being fully open.

There is no power.

Check the fuses/MCBs in

your fuse box/distribu-

tion board.

The flow rate is too low.

The aerator in the tap

or the shower head is

scaled up or dirty.

Clean and/or descale the

aerator or shower head.

Required temperature

>45°C is not achieved.

The water supply has

been interrupted.

Vent the appliance and

the cold water inlet line

(see chapter "Settings").

The cold water inlet tem-

perature is >45°C.

Reduce the cold water

inlet temperature.

If you cannot remedy the fault, notify your qualiﬁed contractor.

To facilitate and speed up your enquiry, please provide the serial

number from the type plate (000000-0000-00000):

Nr.: 000000-0000-00000

D0000041614

INSTALLATION

Safety

6 | PEO 18/21/24 | PEO 27 www.stiebel-eltron.com

INSTALLATION

7. Safety

Only a qualiﬁed contractor should carry out installation, commis-

sioning, maintenance and repair of the appliance.

7.1 General safety instructions

We guarantee trouble-free function and operational reliability only

if original accessories and spare parts intended for the appliance

are used.

Flow pressure

If the ﬂow rate is insufﬁcient to switch on the appliance even when

the tap is open, remove the ﬂow limiter and replace it with the

plastic proﬁle washer supplied.

If required, the pressure in the water installation can also be

raised.

Note

For the thermostatic valve to function correctly, the ﬂow

limiter for this valve must not be replaced with the plastic

proﬁle washer.

!

Material losses

Observe the maximum inlet temperature. Higher tem-

peratures may damage the appliance. You can limit the

maximum inlet temperature by installing a central ther-

mostatic valve.

WARNING Electrocution

This appliance contains capacitors which are discharged

when disconnected from the power supply. The capacitor

discharge voltage may brieﬂy reach >60VDC.

7.2 Shower operation

CAUTION Burns

 If supplying a shower, set the internal temperature

limit to "Tred"; see chapter "Installation alterna-

tives/ Temperature limit".

CAUTION Burns

If the water supplied to the appliance is preheated,

please note the following:

The internally adjustable temperature limit may be ex-

ceeded.

 Limit the temperature with an upstream central

thermostatic valve (ZTA 3/4).

7.3 Instructions, standards and regulations

Note

Observe all applicable national and regional regulations

and instructions.

- The IP 25 (hoseproof) rating can only be ensured with a cor-

rectly ﬁtted cable grommet.

- The speciﬁc electrical resistivity of the water must not fall

below that stated on the type plate. In a linked water net-

work, observe the lowest electrical water resistivity (see

chapter "Speciﬁcation/ Application areas/ Conversion

table"). Your water supply utility will advise you of the specif-

ic electrical water resistivity or conductivity.

8. Appliance description

8.1 Standard delivery

The following are delivered with the appliance:

- Wall mounting bracket

- Threaded stud for wall mounting

- Installation template

- 2 twin connectors (cold water with shut-off valve)

- Flat gaskets

- Cable grommet (power cable from above/ below)

- Screws/ rawl plugs for securing the back panel to allow for

water connection on ﬁnished walls

For appliance replacement:

- 2 tap extensions

9. Preparation

9.1 Installation location

!

Material losses

Install the appliance in a room free from the risk of frost.

 Always install the appliance vertically and near the draw-off

point.

The appliance is suitable for undersink and oversink installation.

Undersink installation

26�02�02�1345

1

2

1 Cold water inlet

2 DHW outlet

INSTALLATION

Installation

ENGLISH

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Oversink installation

12

26�02�02�1344

1 Cold water inlet

2 DHW outlet

Note

 Mount the appliance on the wall. The wall must have

sufﬁcient load bearing capacity.

9.2 Water installation

- No safety valve is required.

- Safety valves are not permissible in the DHW pipe.

 Flush the water line thoroughly.

 Ensure that the ﬂow rate for switching on the appliance is

achieved (see chapter "Speciﬁcation/ Data table", On). If the

ﬂow rate is not achieved, remove the ﬂow limiter (see chap-

ter "Installation/ Removing the ﬂow limiter").

 Increase the mains water pressure if the required ﬂow rate is

not achieved with the draw-off valve fully opened.

Taps

Use appropriate pressure taps. Open vented taps are not per-

missible.

Note

Never use the shut-off valve in the cold water inlet to

reduce the ﬂow rate. It is intended for shutting off the

appliance.

Permissible water line materials

- Cold water inlet pipe:

Pipes made from galvanised steel, stainless steel, copper or

plastic

- DHW outlet line:

Pipes made from stainless steel, copper or plastic

!

Material losses

If plastic pipework systems are used, take into account

the maximum inlet temperature and the maximum pres-

sure (see chapter "Speciﬁcation/ Data table").

Flexible water connection lines

 If the appliance is installed with ﬂexible water connection

lines, ensure that the pipe bends with bayonet ﬁttings do not

become twisted inside the appliance.

 Secure the back panel at the bottom with two additional

screws.

10. Installation

10.1 Standard installation

- Electrical connection from above; installation on unﬁnished

walls

- Water connection on unﬁnished walls

- PEO 18/21/24: Medium connected load is selected

For further installation options, see chapter "Alternative instal-

lation methods":

- Electrical connection from below on unﬁnished walls

- Electrical connection on ﬁnished walls

- Connecting a load shedding relay

- Water installation on ﬁnished walls

- Water connection on unﬁnished walls for appliance

replacement

- Operation with preheated water

- Temperature limit

Opening the appliance

D0000041615

 Open the appliance by releasing the snap lock.

NT

T-

so

X1

26�02�02�0762

 Remove the back panel by pressing the two locking tabs and

pulling the lower section of the back panel forwards.

INSTALLATION

Installation

8 | PEO 18/21/24 | PEO 27 www.stiebel-eltron.com

Preparing the power cable

160

≥ 30

26�02�02�0887

Fitting the wall mounting bracket

26�02�02�0972

 Mark out the holes for drilling using the installation tem-

plate. If the appliance is to be installed with water connec-

tions on ﬁnished walls, also mark out the ﬁxing holes in the

lower part of the template.

 Drill the holes and secure the wall mounting bracket with

2screws and 2rawl plugs (screws and rawl plugs are not

part of the standard delivery).

 Fit the threaded stud provided.

 Fit the wall mounting bracket.

Fitting the cable grommet

26�02�02�0950

 Fit the cable grommet. For connecting cables >6mm², en-

large the hole in the cable grommet.

Making the water connection

!

Material losses

Carry out all water connection and installation work in

accordance with regulations.

26�02�02�0948

 Seal and insert the twin connectors.

!

Material losses

Never use the shut-off valve in the cold water inlet to

reduce the ﬂow rate.

Preparing the back panel

!

Material losses

If you break open the wrong knock-out in the back panel

by mistake, you must use a new back panel.

L

D0000041893

 Break out the cable grommet knock-out in the back panel.

Deburr any sharp edges with a ﬁle if necessary.

INSTALLATION

Installation

ENGLISH

www.stiebel-eltron.com PEO 18/21/24 | PEO 27 | 9

Installing the appliance

L

3

L3’

4

L2’

1

L1’

2

L

MV

NT C

T- soll

X1 1

D0000041894

 Push the back panel over the threaded stud and the cable

grommet. Pull the cable grommet by the locking hooks into

the back panel using pliers, until both locking hooks audibly

click into place.

 Remove the protective transport plugs from the water

connections.

 Press the back panel ﬁrmly into place and lock the ﬁxing tog-

gle by turning it clockwise through 90°.

D0000041925

 Screw the water connection pipes with ﬂat gaskets onto the

twin connectors.

!

Material losses

The strainer must be ﬁtted for the appliance to function.

 When replacing an appliance, check whether the

strainer is installed (see chapter "Maintenance").

Removing the ﬂow limiter

!

Material losses

If you use a thermostatic valve, the ﬂow limiter must not

be removed.

L1’

2

L

X11

26�02�02�0771

2

1

1 Plastic proﬁle washer

2 Flow limiter

 Remove the ﬂow limiter and reﬁt the plastic proﬁle washer.

Making the electrical connection

WARNING Electrocution

Carry out all electrical connection and installation work

in accordance with relevant regulations.

WARNING Electrocution

The connection to the power supply must be in the form

of a permanent connection in conjunction with the re-

movable cable grommet. Ensure the appliance can be

separated from the power supply by an isolator that dis-

connects all poles with at least 3mm contact separation.

WARNING Electrocution

Ensure that the appliance is earthed.

!

Material losses

Observe the type plate. The speciﬁed voltage must match

the mains voltage.

 Connect the power cable to the mains terminal (see chapter

"Speciﬁcation/ Wiring diagram").

INSTALLATION

Installation

10 | PEO 18/21/24 | PEO 27 www.stiebel-eltron.com

PEO 18/21/24: Re-plugging the coding card

In its delivered condition, the appliance is set to 21kW. When

changing to a different connected load, carry out the following

steps:

D0000047341

 Re-plug the coding card according to the selected connected

load (for selectable connected load and fuse protection of the

appliance, see "Speciﬁcation/ Data table").

 Tick the selected connected load on the type plate. Use a

ballpoint pen to do this.

Fitting the base part of the back panel

3

L

3’

4

L

2’

1

L

1’

2

L

NT C

T- sol

l

X11

26�02�02�1348

 Position the lower back panel on the main back panel and

click it into place.

 Align the mounted appliance by undoing the ﬁxing toggle,

aligning the power supply and back panel, and then re-tight-

ening the ﬁxing toggle. If the back panel is not ﬂush with the

wall, the appliance can be secured at the bottom with two

additional screws.

10.2 Alternative installation methods

10.2.1 Electrical connection from below on unﬁnished walls

1

L1í

2

L

X11

26�02�02�0767

 Fit the cable grommet.

!

Material losses

If you break open the wrong knock-out in the back panel

by mistake, you must use a new back panel.

 Break out the cable grommet knock-out in the back panel.

Deburr any sharp edges with a ﬁle if necessary.

 Reposition the mains terminal in the appliance from the top

to the bottom.

 Push the back panel over the threaded stud and the cable

grommet. Pull the cable grommet by the locking hooks into

the back panel using pliers, until both locking hooks audibly

click into place.

 Press the back panel ﬁrmly into place and lock the ﬁxing tog-

gle by turning it clockwise through 90°.

INSTALLATION

Installation

ENGLISH

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10.2.2 Electrical connection on ﬁnished walls

Note

This type of connection changes the IP rating of the ap-

pliance.

 Change the type plate. Cross out "IP 25" and mark

the box "IP 24". Use a ballpoint pen to do this.

!

Material losses

If you break open the wrong knock-out in the back panel

by mistake, you must use a new back panel.

 Cleanly cut or break out the required cable entries in the

back panel (for positions, see chapter "Speciﬁcation/ Dimen-

sions and connections"). Deburr any sharp edges with a ﬁle if

necessary.

 Route the power cable through the cable grommet and con-

nect it to the mains terminal.

10.2.3 Connecting a load shedding relay

When operating additional electric appliances, such as electric

storage heaters, install a load shedding relay in the distribution

board. The relay responds when the instantaneous water heater

starts.

!

Material losses

Connect the phase that switches the load shedding relay

to the indicated terminal of the mains terminal in the

appliance (see chapter "Speciﬁcation/ Wiring diagram").

10.2.4 Water installation on ﬁnished walls

Note

This type of connection changes the IP rating of the ap-

pliance.

 Change the type plate. Cross out "IP 25" and mark

the box "IP 24". Use a ballpoint pen to do this.

26�02�02�0765

 Fit water plugs with gaskets to seal the concealed

connections.

 Fit a suitable pressure tap.

26�02�02�1006

 Click the lower section of the back panel into place in the

upper section of the back panel.

 Secure the connection pipes to the appliance.

 Secure the back panel at the bottom with two additional

screws.

!

Material losses

If you break open the wrong knock-out in the back panel

by mistake, you must use a new back panel.

 Cleanly break out the knock-outs in the appliance cover. De-

burr any sharp edges with a ﬁle if necessary.

 Slide the lower back panel under the connection pipes of the

tap and click the lower back panel into place.

 Secure the connection pipes to the appliance.

10.2.5 Water installation on unﬁnished walls for appliance

replacement

If the existing twin connectors of the old appliance only protrude

from the wall by approx.16mm, you cannot use the twin con-

nectors provided.

Note

With this connection, the cold water supply can only be

shut off within the domestic installation.

16

D0000041634

 Seal and ﬁt the screw-in tap extensions provided.

 Connect the appliance.

INSTALLATION

Commissioning

12 | PEO 18/21/24 | PEO 27 www.stiebel-eltron.com

10.2.6 Operation with preheated water

You can limit the maximum inlet temperature by installing a cen-

tral thermostatic valve.

10.2.7 Temperature limit

Tmax

Tred

Tmax

Tred

D0000041912

2

1

1 Position "Tred" (55°C): Temperature limit

2 Position "Tmax": No temperature limit, for temperature set-

ting range, see chapter "Speciﬁcation/Data table".

 Remove the appliance cover.

 Slide the switch to the required position.

 Fit the appliance cover

CAUTION Burns

When operating with preheated water, the set tempera-

ture limit may be ineffective.

 In this case, limit the temperature at the upstream

central thermostatic valve.

10.3 Completing the installation

 Open the shut-off valve in the twin connector or the cold

water inlet line.

11. Commissioning

WARNING Electrocution

Commissioning must only be carried out by a qualiﬁed

contractor in accordance with safety regulations.

11.1 Initial start-up

D0000041618

 Open and close all connected draw-off valves several times,

until all air has been purged from the pipework and the

appliance.

 Carry out a tightness check.

 Activate the safety pressure limiter by ﬁrmly pressing the

reset button (the appliance is delivered with the safety pres-

sure limiter deactivated).

 Plug the temperature selector cable plug into the PCB.

 Fit the appliance cover, ensuring it clicks into place. Check

that the appliance cover is seated correctly.

 Switch the power supply ON.

 Check the appliance function.

INSTALLATION

Appliance shutdown

ENGLISH

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Appliance handover

 Explain the appliance function to users and familiarise them

with how it works.

 Make the user aware of potential dangers, especially the risk

of scalding.

 Hand over these instructions.

11.2 Recommissioning

Vent the appliance and the cold water inlet line (see chapter "Set-

tings").

See chapter "Initial start-up".

12. Appliance shutdown

 Isolate all poles of the appliance from the power supply.

 Drain the appliance (see chapter "Maintenance").

13. Troubleshooting

WARNING Electrocution

To test the appliance, it must be supplied with power.

Indicator options for diagnostic trafﬁc light (LED)

Red Illuminates in the event of a fault

Yellow Illuminates during heating operation

Green Flashing: Appliance connected to power supply

1

D0000041794

1 Diagnostic trafﬁc light

13.1 Operation with preheated water

You can restrict the maximum inlet temperature by installing a

central thermostatic valve.

Fault / LED diagnos-

tic traffic light

Cause Remedy

The flow rate is too low. The strainer in the appli-

ance is dirty.

Clean the strainer.

The set temperature is

not achieved.

One phase down.

Check the fuse/MCB in

your fuse box/distribu-

tion board.

The heating system does

not switch on.

Air has been detected in

the water and heating

output is briefly switched

off.

The appliance restarts

after one minute.

No hot water and no traf-

fic light display.

The MCB/fuse has re-

sponded/blown.

Check the fuse/MCB in

your fuse box/distribu-

tion board.

Safety pressure limiter

AP 3 has tripped.

Remove the cause of the

fault (e.g. faulty pressure

flush).

Protect the heating sys-

tem against overheating

by opening a draw-off

valve downstream of the

appliance for one minute.

This depressurises and

cools down the heating

system.

Activate the safety

pressure limiter at flow

pressure by pressing the

reset button (see chapter

"Commissioning").

The PCB is faulty. Check the PCB and re-

place if required.

Traffic light display:

Green flashing or con-

stantly on

The PCB is faulty.

Check the PCB and re-

place if required.

No hot water at a flow

rate >2.5l/min.

The flow meter (DFE) is

not plugged in.

Plug the flow meter plug

back in.

The flow meter (DFE) is

faulty.

Check the flow meter and

replace if required.

Traffic light display: Yel-

low constantly on; green

flashing

The high limit safety

cut-out has responded or

suffered a lead break.

Check the high limit safe-

ty cut-out and replace it

if required.

No hot water at flow rate

of >3l/min.

The heating system is

faulty.

Check the heating system

resistor and replace if

required.

The PCB is faulty. Check the PCB and re-

place if required.

Traffic light display: Yel-

low constantly on; green

flashing

The outlet sensor is

unplugged or the lead is

broken.

Plug in the outlet sensor

or replace if required.

Traffic light display: Red

constantly on; green

flashing

The cold water sensor is

faulty.

Check the PCB and re-

place if required.

No hot water

Required temperature >

45°C is not achieved.

The cold water inlet tem-

perature exceeds 45°C.

Reduce the cold water

inlet temperature to the

appliance.

Traffic light display: Red

constantly on; green

flashing

The outlet sensor is

faulty (short circuit).

Check the outlet sensor

and replace if required.

INSTALLATION

Maintenance

14 | PEO 18/21/24 | PEO 27 www.stiebel-eltron.com

14. Maintenance

WARNING Electrocution

Before any work on the appliance, disconnect all poles

from the power supply.

Draining the appliance

The appliance can be drained for maintenance work.

WARNING Burns

Hot water may escape when draining the appliance.

 Close the shut-off valve in the twin connector or the cold

water inlet line.

 Open all draw-off valves.

 Undo the water connections on the appliance.

 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.

Cleaning the strainer

26�02�02�0949

If dirty, clean the strainer in the threaded cold water ﬁtting. Close

the shut-off valve in the cold water inlet line before removing,

cleaning and reﬁtting the strainer.

15. Speciﬁcation

15.1 Dimensions and connections

395

100

485

325

45

5

93

226

190

50

112

190

35

c01

c06

b02

D0000017757

b02 Entry electrical cables I

c01 Cold water inlet Male thread G 1/2 A

c06 DHW outlet Male thread G 1/2 A

Alternative connection options

325

50

35

40

b03

b02

b04

D0000019778

b02 Entry electrical cables I

b03 Entry electrical cables II

b04 Entry electrical cables III

INSTALLATION



ENGLISH

www.stiebel-eltron.com PEO 18/21/24 | PEO 27 | 15

15.2 Wiring diagram

3/PE ~ 380-415 V

85�02�02�0005

1 Heating

2 High limit safety cut-out

3 Safety pressure limiter

Priority control with LR 1-A

85�02�02�0003�

2

1

1 Control cable to the contactor of the 2nd appliance (e.g. elec-

tric storage heater).

2 Control contact drops out when switching the instantaneous

water heater on.

15.3 DHW output

The DHW output is subject to the mains voltage, the appliance's

connected load and the cold water inlet temperature. The rated

voltage and rated output can be found on the type plate (see

chapter "Troubleshooting").

Connected load in kW 38 °C DHW output in l/min.

Rated voltage Cold water inlet temperature

380 V      

16.2 7.0 8.3 10.1 12.9

18.0 7.8 9.2 11.2 14.3

19.0 8.2 9.7 11.8 15.1

19.4 8.4 9.9 12.0 15.4

21.0 9.1 10.7 13.0 16.7

21.7 9.4 11.1 13.5 17.2

22.6 9.8 11.5 14.0 17.9

24.0 10.4 12.2 14.9 19.0

24.4 10.6 12.4 15.2 19.4

25.8 11.2 13.2 16.0 20.5

27.0 11.7 13.8 16.8 21.4

Connected load in kW 

Rated voltage Cold water inlet temperature

380 V      

16.2 5.1 5.8 6.6 7.7

18.0 5.7 6.4 7.3 8.6

19.0 6.0 6.8 7.8 9.0

19.4 6.2 6.9 7.9 9.2

21.0 6.7 7.5 8.6 10.0

21.7 6.9 7.8 8.9 10.3

22.6 7.2 8.1 9.2 10.8

24.0 7.6 8.6 9.8 11.4

24.4 7.7 8.7 10.0 11.6

25.8 8.2 9.2 10.5 12.3

27.0 8.6 9.6 11.0 12.9

15.4 Application areas/ Conversion table

Speciﬁc electrical resistivity and speciﬁc electrical conductivity

(see chapter "Data table").

Standard specifica-







Resis-

tivity

ρ≥

Conductivity σ≤

Resis-

tivity

ρ≥

Conductivity σ≤

Resis-

tivity

ρ≥

Conductivity σ≤

Ωcm mS/m μS/cm Ωcm mS/m μS/cm Ωcm mS/m μS/cm

900 111 1111 800 125 1250 735 136 1361

1000 100 1000 890 112 1124 815 123 1227

1200 83 833 1070 93 935 985 102 1015

1300 77 769 1175 85 851 1072 93 933

15.5 Pressure drop

Taps

Tap pressure drop at a flow rate of 10 l/min

Mono lever mixer tap, approx. MPa 0.04 - 0.08

Thermostatic valve, approx. MPa 0.03 - 0.05

Hand shower, approx. MPa 0.03 - 0.15

Sizing the pipework

When calculating the size of the pipework, an appliance pressure

drop of 0.1MPa is recommended.

15.6 Fault conditions

In the event of a fault, loads up to a maximum of 95°C at a pres-

sure of 1.2MPa can occur temporarily in the installation.

15.7 Test symbols

See type plate on the appliance.

INSTALLATION



16 | PEO 18/21/24 | PEO 27 www.stiebel-eltron.com

15.8 Energy consumption data

Product datasheet: Conventional water heaters to regulation (EU) no. 812/2013 and 814/2013

PEO 18/21/24 PEO 27

233991 233992

Manufacturer STIEBEL ELTRON STIEBEL ELTRON

Load profile S S

Energy efficiency class A A

Energy conversion efficiency % 39 39

Annual power consumption kWh 477 481

Default temperature setting °C 60 60

Sound power level dB(A) 15 15

Special information on measuring efficiency Data at Pmax. Measured with DMB 8.5 l/min

Daily power consumption kWh 2.198 2.220

15.9 Data table

PEO 18/21/24 PEO 27

233991 233992

Electrical data

Rated voltage V 380 400 415 380 400

Rated output kW 18/21/24 27

Rated output kW 16.2/19/21.7 18/21/24 19.4/22.6/25.8 24.4 27

Rated current A 27.6/29.5/33.3 29/31/35 30.1/32.2/36.3 37.1 39

Fuse protection A 32/32/35 32/32/35 32/32/40 40 40

Frequency Hz 50/60 50/60 50/- 50/60 50/60

Phases 3/PE 3/PE

Specific resistance ρ

15

≥ (at ϑcold ≤25°C) Ω cm 900 900 1000 900 900

Specific conductivity σ

15

≤ (at ϑcold ≤25 °C) μS/cm 1111 1111 1000 1111 1111

Specific resistance ρ

15

≥ (at ϑcold ≤45°C) Ω cm 1200 1200 1300 1200 1200

Specific conductivity σ

15

≤ (at ϑcold ≤45°C) μS/cm 833 833 770 833 833

Max. mains impedance at 50Hz Ω 0.284 0.270 0.260 0.254 0.241

Versions

Heating system heat generator Bare wire Bare wire

Insulating block Plastic Plastic

Temperature settings °C 30-60 30-60

Protection class 1 1

Cover and back panel Plastic Plastic

IP rating IP25 IP25

Colour White White

Connections

Water connection G 1/2 A G 1/2 A

Application limits

Max. permissible pressure MPa 1 1

Max. inlet temperature for reheating °C 45 45

Values

Max. permissible inlet temperature °C 60 60

ON l/min >2.5 >2.5

DHW delivery l/min 9.4/11.0/12.6 14.2

Δϑ on delivery K 26 26

Hydraulic data

Nominal capacity l 0.4 0.4

Dimensions

Height mm 485 485

Width mm 226 226

Depth mm 93 93

Weights

Weight kg 3.6 3.6

Note

The appliance conforms to IEC 61000-3-12.

ENGLISH

www.stiebel-eltron.com PEO 18/21/24 | PEO 27 | 17

GUARANTEE | ENVIRONMENT AND RECYCLING

GUARANTEE

ENVIRONMENT AND RECYCLING

Guarantee

The guarantee conditions of our German companies do not

apply to appliances acquired outside of Germany. In countries

where our subsidiaries sell our products a guarantee can only

be issued by those subsidiaries. Such guarantee is only grant

-

ed if the subsidiary has issued its own terms of guarantee. No

other guarantee will be granted.

We shall not provide any guarantee for appliances acquired in

countries where we have no subsidiary to sell our products.

This will not aect warranties issued by any importers.

Environment and recycling

We would ask you to help protect the environment.

After use,

dispose of the various materials in accordance with national

regulations.

18 | PEO 18/21/24 | PEO 27 www.stiebel-eltron.com

CONTENIDO | INDICACIONES ESPECIALES

INDICACIONES ESPECIALES

OPERACIÓN

1. Indicaciones generales �� 19

1.1 Instrucciones de seguridad �� 19

1.2 Otras marcas presentes en esta documentación ��20

1.3 Unidades de medida ��20

2. Seguridad �� 20

2.1 Utilización conforme a las prescripciones ��20

2.2 Instrucciones generales de seguridad �� 20

3. Descripción del aparato �� 20

4. Ajustes �� 21

4.1 Recomendación de ajuste �� 21

5. Limpieza, conservación y mantenimiento �� 21

6. Resolución de problemas �� 21

INSTALACIÓN

7. Seguridad �� 22

7.1 Instrucciones generales de seguridad �� 22

7.2 Modo de ducha ��22

7.3 Reglamentos, normas y disposiciones ��22

8. Descripción del aparato �� 22

8.1 Ámbito de suministro �� 22

9. Preparativos �� 22

9.1 Lugar de montaje �� 22

9.2 Instalación de agua �� 23

10. Montaje �� 23

10.1 Montaje estándar �� 23

10.2 Alternativas de montaje �� 26

10.3 Últimos pasos de montaje �� 28

11. Puesta en marcha �� 28

11.1 Primera puesta en marcha ��28

11.2 Nueva puesta en marcha ��29

12. Puesta fuera de servicio �� 29

13. Localización y reparación de averías �� 29

13.1 Funcionamiento con agua precalentada �� 29

14. Mantenimiento �� 30

15. Especiﬁcaciones técnicas �� 30

15.1 Dimensiones y conexiones ��30

15.2 Esquema de conexiones eléctricas �� 31

15.3 Rendimiento de agua caliente �� 31

15.4 Ámbitos de aplicación/ Tabla de conversión �� 31

15.5 Pérdida de presión �� 31

15.6 Condiciones en caso de avería �� 31

15.7 Sello de certiﬁcación �� 31

15.8 Datos sobre el consumo energético �� 32

15.9 Tabla de especiﬁcaciones �� 32

GARANTÍA

MEDIO AMBIENTE Y RECICLADO

INDICACIONES

ESPECIALES

- El aparato puede ser utilizado por niños de a

partir de 3años, así como por personas con

capacidades físicas, sensoriales o mentales

limitadas, o con falta de experiencia y conoci-

mientos, solo bajo la vigilancia de otra perso-

na o si antes han recibido instrucciones sobre

el uso seguro del aparato y han comprendido

los peligros que pueden derivarse. No deje

que los niños jueguen con el aparato. Las ta-

reas de limpieza y mantenimiento propias del

usuario no deben ser realizadas por niños sin

vigilancia.

- Los grifos/válvulas pueden alcanzar tempe-

raturas de hasta 60°C. A temperaturas de

salida superiores a 43°C existe peligro de

escaldamiento.

- El aparato es apto para el abastecimiento de

una ducha (modo de ducha). Si el aparato

se utiliza también o exclusivamente para el

modo de ducha, el profesional técnico es-

pecializado debe activar el rango de ajuste

de temperatura a través de la limitación de

temperatura (Tred = 55°C) en el aparato. Si

se utiliza agua precalentada, asegúrese de

que la temperatura de admisión no supere los

55°C.

- El aparato debe poder desconectarse omni-

polarmente de la red eléctrica mediante una

separación de al menos 3mm.

- La tensión indicada debe coincidir con la

fuente de suministro.

- El aparato debe estar conectado a un conduc-

tor de puesta a tierra.

- El aparato debe estar continuamente conecta-

do a un cableado ﬁjo.

- Fije el aparato tal como se describe en el ca-

pítulo "Instalación/ Montaje".

OPERACIÓN

Indicaciones generales

ESPAÑOL

www.stiebel-eltron.com PEO 18/21/24 | PEO 27 | 19

- Tenga en cuenta la presión máxima admisible

(véase el capítulo "Instalación/ Especiﬁcacio-

nes técnicas/ Tabla de especiﬁcaciones").

- La resistencia especíﬁca del agua de la red

de abastecimiento de agua no debe tener un

valor inferior al mínimo (véase el capítulo

"Instalación / Especiﬁcaciones técnicas / Tabla

de especiﬁcaciones").

- Vacíe el aparato tal y como se describe en el

capítulo "Instalación/ Mantenimiento/ Vacia-

do del aparato".

OPERACIÓN

1. Indicaciones generales

Los capítulos "Indicaciones especiales" y "Utilización" están dirigi-

dos al usuario del aparato y al profesional técnico especializado.

El capítulo "Instalación" está dirigido al profesional técnico es-

pecializado.

Nota

Lea atentamente estas instrucciones antes del uso y ar-

chívelas en un lugar seguro.

Si entrega este aparato a otros usuarios, no olvide incluir

las instrucciones.

1.1 Instrucciones de seguridad

1.1.1 Estructura de las instrucciones de seguridad

!

PALABRA DE ADVERTENCIA Tipo de peligro

Mediante este tipo de palabras se explican las posibles

consecuencias en caso de desobedecimiento de las ins-

trucciones de seguridad.

 Aquí se proponen las medidas necesarias para evi-

tar el peligro.

1.1.2 Símbolos, tipo de peligro

Símbolo Tipo de peligro

Lesión

Electrocución

Quemaduras

(quemaduras, escaldadura)

1.1.3 Palabras de advertencia

PALABRA DE

ADVERTENCIA

Significado

PELIGRO Indicaciones cuyo desobedecimiento tiene como conse-

cuencia lesiones graves o la muerte.

ADVERTENCIA Indicaciones cuyo desobedecimiento puede tener como

consecuencia lesiones graves o la muerte.

PRECAUCIÓN Indicaciones cuyo desobedecimiento puede tener como

consecuencia lesiones de gravedad media o baja.

!

OPERACIÓN

Seguridad

20 | PEO 18/21/24 | PEO 27 www.stiebel-eltron.com

1.2 Otras marcas presentes en esta documentación

Nota

Las indicaciones generales se señalizan mediante el sím-

bolo adyacente.

 Lea atentamente las indicaciones.

Símbolo Significado

Daños materiales

(daños en el aparato, indirectos, medioambientales)

Eliminación del aparato

 Este símbolo le indica que usted tiene que hacer algo. Se

describen paso a paso las medidas necesarias.

1.3 Unidades de medida

Nota

Si no se indica lo contrario, todas las dimensiones estarán

expresadas en milímetros.

2. Seguridad

2.1 Utilización conforme a las prescripciones

El aparato está previsto para utilizarse en un ámbito doméstico.

Las personas no instruidas lo pueden manejar de forma segura.

El aparato puede utilizarse igualmente en ámbitos que no sean

domésticos, como en pequeñas empresas, siempre que se maneje

del mismo modo.

El aparato a presión sirve para calentar agua potable o para re-

calentar agua previamente calentada. El aparato puede alimentar

uno o varios puntos de dispensado.

Cualquier otro uso distinto al aquí previsto se considera un uso

indebido. Se considera uso previsto el cumplimiento de estas ins-

trucciones, así como las instrucciones de los accesorios utilizados.

2.2 Instrucciones generales de seguridad

PRECAUCIÓN Quemaduras

Los grifos/válvulas pueden alcanzar temperaturas de

hasta 60°C. A temperaturas de salida superiores a 43°C

existe peligro de escaldamiento.

PRECAUCIÓN Quemaduras

La temperatura del agua caliente puede ser distinta de

la temperatura de referencia ajustada en un funciona-

miento con agua precalentada; p. ej., un sistema de ca-

lefacción solar.

!

ADVERTENCIA Lesiones

El aparato puede ser utilizado por niños de a partir de

3años, así como por personas con capacidades físicas,

sensoriales o mentales limitadas, o con falta de expe-

riencia y conocimientos, solo bajo la vigilancia de otra

persona o si antes han recibido instrucciones sobre el

uso seguro del aparato y han comprendido los peligros

que pueden derivarse. No deje que los niños jueguen

con el aparato. Las tareas de limpieza y mantenimiento

propias del usuario no deben ser realizadas por niños

sin vigilancia.

En caso de que niños u otras personas con capacidades físicas,

sensoriales o mentales limitadas utilicen el aparato, recomen-

damos una limitación de temperatura permanente. La limitación

puede realizarla un profesional técnico especializado.

!

Daños materiales

El usuario debe proteger el aparato y los grifos/válvulas

frente a la formación de escarcha.

3. Descripción del aparato

El calentador instantáneo con regulación electrónica con adap-

tación automática de la potencia mantiene constante la tempe-

ratura de salida hasta el límite de rendimiento. Posteriormente,

la temperatura se selecciona mediante la grifería de dispensado.

Sistema de calefacción

El sistema de calefacción de cables desnudos tiene una capa de

plástico estanca a la presión. El sistema de calefacción es apto

para agua tanto pobre como rica en cal, ya que es resistente a

la acumulación de cal. El sistema de calefacción abastece agua

caliente de forma rápida y eﬁcaz.

Nota

El aparato está equipado con un sistema de detección

de aire que evita que se produzcan daños en el sistema

de calefacción. Si durante el funcionamiento entra aire

en el aparato, el aparato desconectará la potencia de

calefacción durante un minuto, con lo que protegerá el

sistema de calefacción.

!

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