Bosch 8735100975, Installation And Service Instructions Manual

Regulations

33

Stora – 6721835341 (2021/04)

3

Regulations

Observe the following guidelines and standards:

• Local regulations
•

EnEG (Building Regulations)

 (in Germany)

•

EnEV

 (in Germany)

Installation of, and equipment for, heating and water heating systems:

•

DIN

 and 

EN

 standards

–

DIN 4753-1

 – Water heaters ...; requirements, identification, 

equipment and testing

–

DIN 4753-3

 – Water heaters ...; corrosion protection on the 

water side with glass lining; requirements and testing 
(product standard)

–

DIN 4753-7

 – Water heaters, containers with a volume up to 

1000 l, manufacturing, thermal insulation and corrosion 
protection requirements

–

DIN EN 12897

 – Water supply - regulation for ... DHW cylinders 

(product standard)

–

DIN 1988-100

 – Technical rules for potable water installations

–

DIN EN 1717 

– Protection of potable water against pollution ...

–

DIN EN 806-5

 – Technical rules for potable water installations

–

DIN 4708

 – Central water heating systems

•

DVGW

– Code of Practise W 551 – Potable water heating systems and 

pipework; technical measures to inhibit the growth of legionella 
bacteria in new systems; ...

– Code of Practise W 553 – Sizing DHW circulation systems ... 

Product data for energy consumption

•

EU Regulation 

and 

Directives

–

EU Regulation 2017/1369

–

EU Regulation 811/2013

 and 

812/2013

4

Transport

WARNING

Risk of injury from carrying heavy loads and inadequately securing 
loads for transport!

▶ Use suitable means of transport.
▶ Secure the cylinder to prevent it falling.

▶ Move packed cylinder with a sack truck and lashing strap 

(



Fig. 5, page  59).

-or-

▶ Move unpacked cylinder with a transport net, during handling, 

protect connections against possible damage.

5

Mounting  method

5.1

Installation location

NOTICE

Risk of damage from inadequate load-bearing capacity of the 
installation surface or unsuitable floor surface!

▶ Ensure that the installation surface is level and offers sufficient load-

bearing capacity.

▶ Install the cylinder in a dry frost-free interior.
▶ If there is any danger of water accumulating on the floor of the 

installation location: place the cylinder on a plinth.

▶ Observe the minimum wall clearances inside the installation room 

(



 Fig.  6, page  59).

▶ Align the cylinder vertically with the adjustable feet.

5.2

Installation

Preventing heat loss through natural circulation:

▶ Install non-return valves in all cylinder circuits.

-or-

▶ Connect pipework directly to the cylinder connections so that natural 

circulation is prevented.

▶ Install connecting pipework free of stress.

5.2.1

Circulation

Connecting a DHW circulation line:

▶ Install a DHW circulation pump which is approved for potable water 

and a non-return valve.

A DHW circulation line is not connected:

▶ Seal and insulate connection.

Circulation is only permitted with reference to the heat losses 
during cooling with a time- and/or temperature-dependent DHW 
circulation pump.

Size the DHW circulation line in accordance with DVGW Code of Practice 
W 553. Observe special requirement according to DVGW W 511:

• Maximum temperature drop 5 K 

To easily maintain the maximum temperature drop:

▶ Install a control valve with thermometer.

5.2.2

Connection on the heat source side

▶ Connect the flow at the top and the return at the bottom to the heat 

exchanger.

▶ Keep primary lines as short as possible and insulate well. This 

prevents unnecessary pressure losses and cooling down of the 
cylinder due to water circulating through the pipework or similar.

▶ Provide effective ventilation (e.g. bleeding device) at the highest 

point between the cylinder and wall mounted boiler to prevent faults 
due to air locks.

▶ Install drain valve in the primary line.

It must be possible to drain the heat exchanger via this line.