Stiebel Eltron PSH 50 Trend: oPerATion

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Special information 

- Install a type-tested safety valve in the cold water 

supply line. For this bear in mind that, depending 

on the static pressure, you may also need a pres-

sure reducing valve.

- Size the drain so that water can drain off unim-

peded when the safety valve is fully opened.

- Fit the discharge pipe of the safety valve with 

a constant downward slope and in a room free 

from the risk of frost.

- The safety valve discharge aperture must remain 

open to the atmosphere.

oPerATion

1.  general information

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

for both the user 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.

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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

En

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1.2  other symbols in this documentation

Note

General information is identified by the symbol shown 

on the left.

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Read these texts carefully.

Symbol

Meaning

Material losses

(appliance and consequential losses, environmental pol-

lution)

Appliance disposal 

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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 heating domestic hot water and can 

supply one or more draw-off points.

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

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

mestic environment, e.g. in a small business, as long as it is used 

in the same way.

Any other use beyond that described shall be deemed inappro-

priate. Using the appliance for heating fluids other than water or 

water supplemented with chemicals, such as brine, is also deemed 

inappropriate.

Observation of these instructions and of instructions for any ac-

cessories used is also part of the correct use of this appliance.

2.2  general safety instructions

WARNING Burns

During operation, the tap and safety valve can reach 

temperatures in excess of 60 °C.

There is a risk of scalding at outlet temperatures in ex-

cess of 43 °C.

!

WARNING Injury

The appliance may be used by children aged 8 and up and 

persons with reduced physical, sensory or mental capa-

bilities 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.

!

Material losses

The user should protect the water lines and the safety 

valve from frost.

Note

The appliance is under pressure. During the heat-up 

process, expansion water will drip from the safety valve.

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If water continues to drip when heating is complet-

ed, please inform your qualified contractor.

2.3  ce designation

The CE designation shows that the appliance meets all essential 

requirements according to the:

- Electromagnetic Compatibility Directive

- Low Voltage Directive

2.4  test symbols

See type plate on the appliance.

3.  appliance description

The closed (pressure-tested) appliance heats DHW electrically. 

You can adjust the temperature using the temperature selector. 

Subject to the power supply, the water is heated automatically to 

the required temperature.

The internal steel cylinder is coated with special "Co Pro" enamel 

and is equipped with a protective anode. The anode protects the 

internal cylinder from corrosion.

Frost protection

The appliance is also protected against frost by the temperature 

setting "*", provided that the power supply is guaranteed. The 

appliance switches on in good time and heats the water. The ap-

pliance does not protect the water supply lines and the safety 

valve from frost.

!

oPerATion 

Settings

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4.  settings

The temperature can be freely adjusted.

max

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00000

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2

1

1 

ON/OFF indicator

2 

Temperature selector

* 

Frost protection

E 

Recommended energy saving position, low scaling, 60 °C

Max  Maximum temperature setting, 75 °C

Depending upon the system, the actual temperatures may vary 

from the set value.

on/oFF indicator

The ON/OFF indicator illuminates when water is being heated.

4.1   Holiday and absence

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If the appliance is not to be used for a few days, set the tem-

perature selector to a position between the frost protection 

and energy saving settings.

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If the appliance is not to be used for a longer period, set it to 

frost protection to conserve energy. If there is no risk of frost 

you may disconnect the appliance from the power supply.

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For reasons of hygiene, heat up the content of the water 

heater once to above 60 °C before initial use.

5.  cleaning, care and maintenance

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Have the electrical safety of the appliance and the function of 

the safety valve regularly checked by a qualified contractor.

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Have the protective anode initially checked by a qualified 

contractor after the first year. The qualified contractor will 

then determine the intervals at which it must be checked 

thereafter.

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Never use abrasive or corrosive cleaning agents. A damp 

cloth is sufficient for cleaning the appliance.

scaling

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Almost every type of water will deposit lime at high temper-

atures. This settles inside the appliance and affects both the 

performance and service life. The heating elements must 

therefore be descaled from time to time. A qualified contrac-

tor who knows the local water quality will tell you when the 

next service is due.

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Check the taps/valves regularly. You can remove limescale 

deposits at the spouts using commercially available descaling 

agents.

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Regularly activate the safety valve to prevent it from becom-

ing blocked e.g. by limescale deposits.

6.  troubleshooting

Problem

cause

remedy

The water does not heat 

up and the ON/OFF indi-

cator does not illuminate.

There is no power. 

Check the fuses/MCBs in 

your fuse box. 

The water does not heat 

up sufficiently and the 

ON/OFF indicator illumi-

nates.

The temperature is set 

too low. 

Select a higher temper-

ature. 

The appliance heats, 

for example, after large 

amounts of DHW have 

been drawn.

Wait until the ON/OFF 

indicator goes out.  

The flow rate is low. 

The aerator in the tap or 

shower head is scaled up 

or contaminated.

Clean and/or descale the 

aerator or shower head. 

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

facilitate and speed up your enquiry, please provide the numbers 

from the type plate (000000 and 0000-000000):

E-NO.: 000000

F-NO.: 0000-000000

D

00000

3

7

1

4

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