01 | 01
We never compromise
when it comes to service
Our central service is available from Monday to Thursday
from 07:15 until 18:00h and Fridays from 07:15 until 17:00h.
INFO CENTRE sales Tel. +49 (0)5531 702 110
Fax +49 (0)5531 702 95108
info-center@stiebel-eltron.de
Spare part sales Tel. +49 (0)5531 702 120
Fax +49 (0)5531 702 95335
ersatzteile@stiebel-eltron.de
Customer Support Tel. +49 (0)5531 702 111
Fax +49 (0)5531 702 95890
kundendienst@stiebel-eltron.de
Engineering and Installation 2013 | STIEBEL ELTRON
DHW Renewables Air conditioning Central heating
Engineering and installation
System cylinders
March 2013
SALES CENTRES
WEST
Max-Planck-Ring 33 | D-46049 Oberhausen
Tel. +49 (0)0208 88215 10
Fax +49 (0)0208 88215 188
oberhausen@stiebel-eltron.de
MID
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Tel. +49 (0)6173 602 10 | Fax +49 (0)6173 602 38
frankfurt@stiebel-eltron.de
NORTH
Georg-Heyken-Straße 4a | D-21147 Hamburg
Tel. +49 (0)40 752018 10 | Fax +49 (0)40 752018 88
hamburg@stiebel-eltron.de
SOUTH | Bavaria
Hainbuchenring 4 | D-82061 Neuried
Tel. +49 (0)89 899156 10 | Fax +49 (0)89 899156 88
muenchen@stiebel-eltron.de
EAST
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Tel. +49 (0)34297 985 10 | Fax +49 (0)34297 985 188
SOUTH | Baden-Württemberg
Motorstraße 39 | D-70499 Stuttgart
Tel. +49 (0)711 98867 10 | Fax +49 (0)711 98867 88
stuttgart@stiebel-eltron.de
System cylinders
304335
D0000032742-b
STIEBEL ELTRON GmbH & Co. KG | Dr.-Stiebel-Straße
37603 Holzminden | www.stiebel-eltron.de
Engineering and installation
Reprinting or duplication, even partially, is only allowed with our express permission.
STIEBEL ELTRON GmbH & Co. KG, 37603 Holzminden
Legal note
In spite of the care taken in the production of this technical guide, no guarantee can be given regarding the accuracy
of its contents. Information concerning equipment levels and specification are subject to modification. The equipment
features described in this technical guide are not binding properties of our products. Due to our policy of ongoing
improvement, some features may have subsequently been changed or even removed. Our experts will be happy to
advise you about currently applicable equipment characteristics. Pictorial illustrations in this technical guide only
represent sample applications. The illustrations also contain installation components, accessories and special equip-
ment, which is not part of the standard delivery.
Specification
Dimensions in the diagrams are in millimetres unless stated otherwise. Pressure figures may be stated in pascals
(MPa, hPa, kPa) or in bars (bar, mbar). The details of threaded connections are given in accordance with ISO228. Fuse
types and sizes are stated in accordance with VDE. Output details apply to new appliances with clean heat exchang-
ers.
www.stiebel-eltron.com System Cylinder Technical Manual | 3
www.stiebel-eltron.com System cylinder Technical Manual | 3
CONTENTS
INTRODUCTION ______________________________________________________5
System cylinders made in Germany _____________________________6
System flexibility for all application areas ______________________7
Purpose of this technical manual ________________________________8
Selection matrix for system cylinders ___________________________9
DHW heating ______________________________________________________ 10
Application requirements _____________________________________ 10
Requirements concerning hygiene __________________________ 10
Sizing ______________________________________________________________ 10
Buffer cylinder principles _______________________________________ 12
Water as storage medium _____________________________________12
Heat transfer and fluid mechanics __________________________ 13
PROtemp-Flow system _________________________________________ 14
Relevant standards ______________________________________________ 15
Requirements of the DVGWW551 (2004-04) Code of
Practice ____________________________________________________________ 16
Summary of formulae ___________________________________________ 17
BUFFER CYLINDER ________________________________________________ 19
SBP 100 ____________________________________________________________ 20
Function description ___________________________________________ 20
System solutions ________________________________________________ 21
Specification _____________________________________________________ 22
SBP200-700E/ ESOL/ Ecool ________________________________ 24
Function description ___________________________________________ 24
System solutions ________________________________________________ 25
Sizing ______________________________________________________________ 29
Specification _____________________________________________________ 30
SBP1000-1500E/ESOL/Ecool _____________________________ 34
Function description ___________________________________________ 34
System solutions ________________________________________________ 35
Sizing ______________________________________________________________ 39
Specification _____________________________________________________40
Thermal insulation accessories ______________________________ 45
Further accessories_____________________________________________46
DHW CYLINDER ____________________________________________________ 47
SBB150WPF _____________________________________________________ 48
Function description ___________________________________________48
System solutions ________________________________________________ 49
Sizing ______________________________________________________________ 50
Specification _____________________________________________________ 51
Accessories _______________________________________________________ 51
SBB301-501WP/WPSOL _____________________________________ 54
Function description ___________________________________________ 54
System solutions ________________________________________________ 55
Sizing ______________________________________________________________ 59
Specification _____________________________________________________ 60
Further accessories_____________________________________________ 65
SBB300-500WPbasic _________________________________________ 66
Function description ___________________________________________ 66
System solutions ________________________________________________ 67
Sizing ______________________________________________________________ 69
Specification _____________________________________________________ 70
SBB 600-1000WPSOL __________________________________________ 74
Function description ___________________________________________ 74
System solutions ________________________________________________ 75
Sizing ______________________________________________________________ 77
Specification _____________________________________________________ 78
Further accessories_____________________________________________ 83
SBB751-1001/SOL _____________________________________________ 84
Function description ___________________________________________84
System solutions ________________________________________________ 85
Sizing ______________________________________________________________ 88
Specification _____________________________________________________ 89
Accessories _______________________________________________________94
COMBI/INSTANTANEOUS WATER CYLINDER ___________________ 97
SBS601-1501W/WSOL _______________________________________ 98
Function description ___________________________________________ 98
System solutions ________________________________________________ 99
Sizing _____________________________________________________________103
Specification ___________________________________________________ 104
Accessories ______________________________________________________109
SBK600/150 _____________________________________________________ 110
Function description __________________________________________110
System solutions _______________________________________________111
Sizing _____________________________________________________________115
Specification ____________________________________________________116
4 | System Cylinder Technical Manual www.stiebel-eltron.com
CONTENTS
SOLAR DHW CYLINDER ___________________________________________ 119
KS150SOL _______________________________________________________ 120
Function description _________________________________________ 120
System solutions _______________________________________________121
Sizing _____________________________________________________________122
Specification ___________________________________________________ 123
SBB300-600plus ______________________________________________ 126
Function description __________________________________________126
System solutions _______________________________________________127
Sizing ____________________________________________________________ 130
Specification ____________________________________________________131
SBB300-500basic _____________________________________________ 136
Function description _________________________________________ 136
System solutions _______________________________________________137
Sizing ____________________________________________________________ 140
Specification ____________________________________________________141
Accessories ______________________________________________________145
www.stiebel-eltron.com System Cylinder Technical Manual | 5
INTRODUCTION
www.stiebel-eltron.com System cylinder Technical Manual | 5
INTRODUCTION
Introduction
26_03_20_0119
6 | System Cylinder Technical Manual www.stiebel-eltron.com
INTRODUCTION
SYSTEM CYLINDERS MADE IN GERMANY
System cylinders made in Germany
STIEBELELTRON is a group of companies
with a decidedly international outlook, and
can rightly claim to be a market leading
supplier of technology worldwide for do-
mestic technology and equipment for the
utilisation of renewable energy. For more
than 80years, the company's policies have
been based on its level of technical compe-
tence, high quality standards, innovation,
reliability and customer-oriented service.
Five national and international production
facilities, 16 subsidiaries around the world
plus sales organisations and representa-
tions in 120 countries add up to a truly
global presence for STIEBELELTRON.
6 STIEBEL ELTRON offers convenient and
energy efficient solutions for renewables,
domestic hot water, air conditioning and
room heating. The Holzminden site is the
head office of the STIEBELELTRON Group –
and also its largest production facility. Not
only is it home to the worldwide adminis-
tration and sales organisation, it's also the
production site of many millions of electri-
cal DHW and heating appliances as well as
plants and systems that use renewables.
STIEBELELTRON started to develop ap-
pliances that use renewables more than
35years ago. Today the company is one
of the leading suppliers of heat pumps for
heating, cooling and DHW, ventilation sys-
tems with heat recovery as well as solar
thermal systems, covering an output range
from 5 to 500kW.
The group invests particularly in its manu-
facturing sites in Germany. Between 2007
and 2009, one of the most advanced and
sizeable heat pump production facilities
in the world was created in Holzminden,
representing an investment of around €20
million.
The expansion of renewables necessitat-
ed a substantial extension in the range of
DHW and buffer cylinders required for this
sector. Different systems require accord-
ingly designed DHW and buffer cylinders.
Traditionally the company has been ori-
ented towards wholesalers and contrac-
tors. This focus remains the company's
philosophy today. STIEBEL ELTRON val-
ues the active support of its partners and
provides training plus sales and service
support. The retail trade, contractors
and engineers/designers have access to
the training academy in Holzminden for
product support. Every year, more than
20.000participants make good use of its
wide range of courses. The whole product
range is showcased in six sales centres in
Germany, including permanent exhibitions
- mostly with 'live' systems.
During 2010, the Group investments in
the production sites in Germany climbed
above the €10million barrier once again.
Investments were targeted at the develop-
ment of new products and the installation
of new production lines. A new logistics
centre for finished products in Holzminden
contributes to even greater availability for
our customers.
An ambitious research, development and
investment program has been designed to
equip STIEBELELTRON for the years ahead.
www.stiebel-eltron.com System Cylinder Technical Manual | 7
INTRODUCTION
SYSTEM FLEXIBILITY FOR ALL APPLICATION AREAS
www.stiebel-eltron.com System cylinder Technical Manual | 7
INTRODUCTION
SYSTEM FLEXIBILITY FOR ALL APPLICATION AREAS
System flexibility for all application areas
With STIEBEL ELTRON's system cylinders,
almost any application can be implement-
ed reliably and economically, with heating,
cooling or DHW along with a wide variety
of heat generators, whatever the building
type. The product range includes the fol-
lowing:
Buffer cylinder
»Cylinder volume from 100 to 1500litres
»Wall mounted or floorstanding appli-
ances
DHW cylinder
»Cylinder volume from 150 to 1000litres
»High grade enamelled steel cylinders
Combi/instantaneous water cylinder
»Cylinder volume from 600 to 1500litres
»PROtemp-Flow system
Solar cylinder
»Cylinder volume from 150 to 600litres
»Wall mounted or floorstanding appli-
ances
»Solar charging for cylinders up to
1500litres
STIEBELELTRON was the first manufac-
turer to obtain the EEA (European Enamel
Authority) quality certificate for its DHW
cylinder enamel coating.
Example:
Buffer cylinder in a dual mode combination with heat pump and oil/gas boiler
Example:
DHW cylinder with solar and heat pump connection
Example:
Combi/instantaneous water cylinder with solar and oil/gas boiler connection
Example:
Solar cylinder with solar and oil/gas boiler connection
S%20Boiler%20SBS%20HK2%20SOL
S%20Solar%20SBB-SOL-basic%20SBP-SOL%20Oel
S%20WPL57%20SBP-G%20HK1%20Oil
S%20WPLa%20SBP%20HK1%20SBB%20SOL2
8 | System Cylinder Technical Manual www.stiebel-eltron.com
INTRODUCTION
PURPOSE OF THIS TECHNICAL MANUAL
Purpose of this technical manual
Contents and scope
This technical manual is designed to serve
as a technical reference and guide for the
sizing and selection of STIEBEL ELTRON
system cylinders for your specific appli-
cation.
In addition to extensive information re-
garding our product range, the technical
guide contains engineering instructions,
sizing recommendations, sample calcu-
lations and considerations, as well as a
selection of system solutions for the ap-
plications we consider the most pertinent.
The "Renewables" engineering depart-
ment at STIEBEL ELTRON will be happy to
provide you with individual support in your
building project.
The selection matrix
To aid selection and facilitate the alloca-
tion of STIEBEL ELTRON system cylinders
to your specific applications, we have la-
belled the system cylinders with the rele-
vant symbols.
The selection criteria are the building type,
the required functions of heating, cooling
and DHW, and the heat generators with
which they can be combined.
The meaning of the individual symbols is
explained below.
Diagrams and examples
Diagrams in this manual should be viewed
as schematic illustrations. To keep illus-
trations simple, some safety assemblies
are not shown and must be installed on
site depending on the locally applicable
regulations.
The sizing samples shown should be rec-
ognised as examples only, they cannot
replace the need for specific system en-
gineering.
Building type Function Heat source
Detached house Heating Heating heat pumps
Two-family house Cooling Solar thermal system
Apartment buildings Domestic hot water Gas/oil condensing boiler
Non-residential buildings Solid fuel heat generator
Key to symbols
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INTRODUCTION
SELECTION MATRIX FOR SYSTEM CYLINDERS
www.stiebel-eltron.com System cylinder Technical Manual | 9
INTRODUCTION
SELECTION MATRIX FOR SYSTEM CYLINDERS
Selection matrix for system cylinders
Cylinder type
Buffer cylinder
SBP 100 • • •
SBP 200 E • • • •
SBP 200 E cool • • • • •
SBP 400 E • • • •
SBP 400 E cool • • • • •
SBP 700 E • • • • • •
SBP 700 E SOL • • • • • • •
SBP 1000 E • • • • • •
SBP1000Ecool • • • • • • •
SBP1000ESOL • • • • • • •
SBP 1500 E • • • • •
SBP1500Ecool • • • • • •
SBP1500ESOL • • • • • •
Heat pump DHW cylinders
SBB150WPF • • •
SBB301WP • • •
SBB302WP • • •
SBB401WPSOL • • • • • • •
SBB501WPSOL • • • • • • • •
SBB300WPbasic • • •
SBB400WPbasic • • • •
SBB500WPbasic • • • • •
SBB600WPSOL • • • • • • •
SBB800WPSOL • • • • • • •
SBB1000WP SOL • • • • • • •
SBB751 • • • • • • • •
SBB751SOL • • • • • • • •
SBB1001 • • • • • • •
SBB1001SOL • • • • • • •
Combi/instantaneous water cylinder
SBS601W • • • • • •
SBS601WSOL • • • • • • •
SBS801W • • • • • •
SBS801WSOL • • • • • • •
SBS1001W • • • • • • •
SBS1001WSOL • • • • • • • •
SBS1501W • • • • • • •
SBS1501WSOL • • • • • • • •
SBK600/150 • • • • • • •
KS150SOL • • •
SBB300plus • • • • •
SBB400plus • • • • • •
SBB600plus • • • • • • •
SBB300basic • • • • • •
SBB400basic • • • • • • •
SBB500basic • • • • • • • •
10 | System Cylinder Technical Manual www.stiebel-eltron.com
INTRODUCTION
DHW HEATING
DHW heating
Application requirements
Research has shown that approx. 50 % of
the potable water in domestic households
is heated. Contrary to central heating, DHW
is used all the year round in almost con-
stant amounts and with almost the same
temperature. When designing system
solutions, the following questions should
be considered by the system engineer:
»Requirements concerning hygiene and
safety
»Required temperature levels, consump-
tion and consumption profile
»Ratio of heating load and structure of
cylinder volume
»DHW heating concept
»Integration of peak load heat generators
»Auxiliary energy consumption and ener-
gy losses in the distribution system
»Overcoming long distances efficiently in
the distribution system
Requirements concerning hygiene
For the definition of hygiene requirements
in Germany, the DVGW Code of Practice
W551 is decisive. This Code of Practice
differentiates between small and large
systems, and formulates requirements for
hygienic operation and for pasteurisation,
such as, for example:
— Large systems are those with central
DHW cylinders >400l and/or a pipework
capacity >3l per line between the DHW
cylinder outlet and the draw-off point.
At the DHW outlet of the DHW cylinder,
a temperature of ≥60°C must be main-
tained at all times.
— Small systems are all systems with DHW
cylinders or a centralised instantaneous
water heater in detached or two-family
houses, independent of the cylinder size
and pipework capacity, as well as sys-
tems ≦400 l and with pipework capacity
≦3 l per line between the DHW cylinder
connector and the draw-off point. In
small systems the operating temperature
should not fall below 50°C. Like large
systems, small systems must be able to
maintain a DHW temperature ≧60°C.
— The DHW content of preheating stages
must be heated to ≥60°C at least once
a day. This determination applies to ex-
ternal and integral preheating stages.
— The water temperature in DHW circula-
tion systems and self-regulating ribbon
heaters must not be more than 5K below
the DHW cylinder outlet temperature.
— DHW circulation systems may be
switched off for up to 8hours in any
24hour period to save energy. However,
this is only permissible subject to abso-
lutely hygienic conditions.
Sizing
Residential buildings
The heat demand in central systems for
DHW heating can be determined by var-
ious means.
The recognised technical rule [in Germa-
ny] is still DIN 4708. This is based on the
principle of a "Standard residential unit".
This comprises four rooms with an occu-
pation level of 3.5, i.e. 3 to 4 occupants,
and a standard bath as the most significant
draw-off point. This enables several apart-
ments in a single building to be converted
to a specific number of standard residen-
tial units. Design size is the resulting de-
mand factor, used for determining the heat
source and the DHW cylinder.
The sizing principles for the standard res-
idential unit are up to 40years old and
reflect the habits of that time. Today, sig-
nificantly fewer occupants live in each res-
idential unit. In today's apartment build-
ings, single and two-occupant households
dominate. Germany is one of the countries
with the lowest water consumption per cit-
izen in the European Union. Significantly
increased costs for drinking water and
waste water disposal, growing awareness
of environmental issues and technical ad-
vances in tap design have all contributed
to this development.
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INTRODUCTION
DHW HEATING
www.stiebel-eltron.com System cylinder Technical Manual | 11
INTRODUCTION
DHW HEATING
1 4
2 3
31l
44l 59l
38l
Models acc. to sheet 12 of VDI2067
Total demand Total DHW demand per person Total energy demand per person
V
N, ttl, d
l/d
V
N, ttl, p.a.
m
3
/h
Q
N, ttl, d
kWh/d
q
N, ttl, p.a.
kWh/p.a.
Model 1
15 – 47 5.2 – 16.2 0.5 – 1.6 190 – 570
Average value 31 10.7 1.1 380
+ demand 1: 4 1.3 0.2 60
+ demand 2: 3 – 6 1.0 – 2.1 0.1 – 0.2 40 – 70
Model 2
33 – 56 11.4 – 19.3 1.1 – 1.9 400 – 680
Average value 44 15.7 1.5 540
+ demand 1: 4 1.3 0.2 60
+ demand 2: 3 – 6 1.0 – 2.1 0.1 – 0.2 40 – 70
Model 3
48 – 71 16.6 – 24.5 1.7 – 2.5 580 – 860
Average value 59 20.7 2.1 720
+ demand 1: 4 1.3 0.2 60
+ demand 2: 3 – 6 1.0 – 2.1 0.1 – 0.2 40 – 70
Model 4
22 – 54 7.5 – 18.6 0.7 – 1.9 270 – 650
Average value 42 14 1.5 520
+ demand 1: 4 1.3 0.2 60
+ demand 2: 3 – 6 1.0 – 2.1 0.1 – 0.2 40 – 70
Sizing heat pump systems
Engineers can often only rely on DIN4708
to a limited extent when sizing heat pumps,
and sometimes not at all. This is firstly due
to the absence of standard principles for
determining the performance factor of
cylinders and heat generators with flow
temperatures <60 °C, and secondly to the
outdated principles on consumption and
sizing, which which have led to oversized
and economically unattractive solutions.
Where the continuous DHW output exceeds
the building heat load, sizing the heat gen-
erator in accordance with DIN4708 would
result in sizing only according to DHW de-
mand. This method of sizing is no longer
appropriate, since the investment outlay
for heat pump and source system is a key
factor. The heat pump engineer will in-
stead adjust the cylinder volume or peak
load heat generator subject to the con-
sumption profile and may, if appropriate,
shift the heat-up times.
It would be more realistic to size the heat
generator and DHW cylinder in accordance
with sheet 12 of the VDI2067 directive.
Four models, differing in terms of type
and number of draw-off points, form the
basis for sizing.
Non-residential buildings
The DHW demand and the associated de-
mand profile in non-residential buildings
must be assessed and designed individu-
ally. In many cases, a low demand for DHW
(e.g. in office buildings) would not war-
rant the installation of a centralised supply
system. In such cases, decentralised heat
sources should be considered.
Centralised systems such as those found in
sports facilities, swimming pools or care
homes are large in size. These need to
meet stringent hygiene standards as well
as specific standards and directives appli-
cable to such buildings. Sizing is provided
by the sum curves method. An adequate
knowledge of demand, distribution and
consumption profiles form the basis for
this, and these determine the concept as
well as the output of the heat source and
the cylinder volume.
Explanations on additional demand
+ demand 1: Washing up only by hand
+ demand 2: Bidet
1 Shower
2 Standard bath tub
3 Large bath tub
4 Standard bath tub and shower
26_03_01_1267
The DHW distribution and generation con-
cept for non-residential buildings must
also be assessed on an individual basis. It
is rarely economically viable to maintain
high temperatures over longer distances,
particularly for a heat pump. This would,
for example, be the case in local heating
networks. The permanently high temper-
ature level reduces the overall efficiency
even when heating, and generates unnec-
essarily high losses in summer. Frequent-
ly, decentralised heat sources or even heat
pumps would offer a better solution.
12 | System Cylinder Technical Manual www.stiebel-eltron.com
INTRODUCTION
BUFFER CYLINDER PRINCIPLES
Buffer cylinder principles
Water as storage medium
Due to its physical properties water is an
ideal medium for storing heat. In addition
to its high specific heat storage capacity,
it possesses further highly advantageous
characteristics which allow cold and hot
water to be stored separately in a single
cylinder. Hot water stratifies above cooler
water. If this is utilised effectively, several
benefits result for heat generator and heat
consumer operation.
In most cases, the term "buffer cylinder"
denotes a cylindrical container that stores
sensible heat in water. Sensible heat, also
referred to as tangible heat, is defined by
the rise in temperature according to the
following formula:
Q = m
.
c
p
.
(ϕ
max
- ϕ
min
)
Due to the heat storage medium deployed,
water cylinders offer several benefits:
»Water, as a pure substance, is non-toxic
and therefore ecologically sound.
»Water is available in practically limitless
quantities. The initial outlay is therefore
very low compared to alternative heat
transfer media.
»Water possesses favourable physical
properties, and in particular a high spe-
cific thermal capacity.
»The density of water is temperature de-
pendant. Density diminishes with rising
temperature. One litre of water at 90 °C
weighs approximately 3.5% less than it
would at 20 °C.
»Water has low thermal conductivity. This
impedes the heat exchange by thermal
conduction between two volumes of
water with a different temperature.
x ϕ [°C]
972
1000
968
964
10 20 30 40 50 60 70 80 90
976
980
984
988
992
996
y ρ [kg/m
3
]
X
Y
Density of water subject to temperature
X Temperature [°C]
Y Density [kg/m
3
]
84_01_20_0026
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INTRODUCTION
BUFFER CYLINDER PRINCIPLES
www.stiebel-eltron.com System cylinder Technical Manual | 13
INTRODUCTION
BUFFER CYLINDER PRINCIPLES
1 3
2
4
5
ϕ
h
Heat transfer and fluid mechanics
Directly charged and discharged buffer
cylinders (see illustration) are generally
operated as displacement cylinders. Dur-
ing charging, water is fed into the cylinder
from the top and the equivalent amount
of water is drawn off at the bottom. Dis-
charge takes place against the direction
of flow.
In an operational buffer cylinder, convec-
tion flow patterns can occur which are
detrimental to the evenness of flow. A
differentiation should be made between
natural and forced convection. Natural
X
h
Convection flow as a result of heat loss-
es
Forced convection through unhindered lateral ingress
Directly charged and discharged buffer cylinders
convection is caused by heat losses to the
environment. When heat losses occur, the
fluid near the wall cools down and flows
downwards.
As a result of these flow patterns the dis-
tinct temperature distribution is further
reduced; the cylinder content is mixed.
Natural convection can be virtually elim-
inated with adequate thermal insulation.
Forced convection is caused by flow being
fed into or drawn from the cylinder.
26_03_20_0120
26_03_20_0121
26_03_20_0122
1
2
x Distance from the cylinder wall
h Cylinder height
1 Heat source
2 Cylinder
3 Consumer
4 Discharging
5 Charging
h Cylinder height
ϕ Cylinder temperature [°C]
1 Temperature pattern after 2 minutes
2 Temperature pattern after 3 minutes
14 | System Cylinder Technical Manual www.stiebel-eltron.com
INTRODUCTION
improved
efficiency
extended runtime
of renewable
energy sources
temperature-sensitive stratification
improved cylinder heating
greater amount of available heat
reduced runtime of additional heat generators
higher coverage reduced emissions
Benefits of the PRO temp-Flow system
continually colder temperature level
in the lower cylinder section
higher yields
An unhindered, high velocity flow into the
cylinder mixes the content in the upper
cylinder section thoroughly, due to the
hotter, unrestricted incoming jet. Forced
convection occurs.
As the simulation progresses, the mixed
zone extends through the entire upper
third of the cylinder.
Any higher usable temperature level in
the upper section of the cylinder would
be destroyed when colder water flows in.
The design of the inlet device is crucial
here. A suitable device enables charging
and discharging with almost no distur-
bance.
In our cylinders, this is ensured by the
PROtemp-Flow system.
26_03_20_0125
Location of the PROtemp-Flow system inside the
cylinder.
View from behind the entry point.
The heat pump flow meets the
PROtemp-Flow and is split into
partial flows by flowing through
the open cross sections.
Depiction of an indi-
vidual partial flow as it
crosses the PROtemp-
Flow to enter the cylin-
der interior.
View from the cylinder interior of the
PROtemp-Flow. The total flow has split
into radial partial flows. The radially
directed flow with reduced velocity mini-
mises unregulated mixing of the temper-
ature strata inside the cylinder.
PROtemp-Flow system
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INTRODUCTION
RELEVANT STANDARDS
www.stiebel-eltron.com System cylinder Technical Manual | 15
INTRODUCTION
RELEVANT STANDARDS
Relevant standards
Siting and installation
The siting, installation, adjustment and
commissioning of a system must be car-
ried out by a qualified contractor, giving
due consideration to the operating and in-
stallation instructions. The electrical con-
nection must only be carried out by a con-
tractor authorised by the relevant power
supply utility, giving due consideration to
the relevant VDE regulations as well as the
instructions of the relevant power supply
utility (technical connection conditions or
local regulations).
DIN and DIN EN standards
»DIN EN 806 Technical rules for DHW in-
stallations
»DIN EN 806 Part 1: General information
»DIN EN 806 Part 2: Engineering
»DIN EN 806 Part 3: Calculating the inter-
nal pipe diameter – Simplified procedure
»DIN 1988 Technical rules for DHW instal-
lations: Observe national supplements.
»DIN 1988 Part 2: Design and implementa-
tion; components, appliances, materials
– Technical rules of the DVGW
»DIN 1988 Part 4: Protection of drinking
water, maintaining the drinking water
quality – Technical rules of the DVGW
»DIN 1988 Part 7: Prevention of corrosion
damage and scaling; technical rules of
the DVGW
»DIN 4708 Central water heating instal-
lations
»DIN 4708 Part 1: Terminology and calcu-
lation principles
»DIN 4708 Part 3: Rules on checking the
output of water heaters in domestic
buildings
»DIN EN 1717 Protection of drinking water
from contamination in drinking water in-
stallations and general requirements of
safety equipment for the prevention of
drinking water contamination by back-
wash – Technical rules of the DVGW
»DIN 50930 Metal corrosion – Corrosion of
metallic materials inside pipework, cyl-
inders and appliances due to corrosive
attack by water
»DIN 50930 Part 6: Effects on drinking
water quality
»DIN EN 12828 Heating systems in build-
ings – Engineering hot water heating
systems
»DIN EN 12897 Water supply – Provisions
governing indirectly heated, unvented
(sealed) DHW cylinders
»DIN 4753 Water heaters and water heat-
ing installations for drinking and process
water: Observe national supplements
»DIN 4753 Part 1: Requirements, identifi-
cation, equipment and testing
»DIN 4753 Part 3: Corrosion protection on
the water side through enamelling – Re-
quirements and testing
»DIN 4753 Part 6: Cathodic corrosion pro-
tection for enamelled steel cylinders –
Requirements and testing
»DIN 4753 Part 8: Thermal insulation of
water heaters up to 1000l nominal ca-
pacity – Requirements and testing
VDI guidelines
»VDI 2067 Efficiency of technical building
systems
»VDI 2068 Measuring/monitoring and
control equipment in heating systems
with water as heat transfer medium
»VDI 2078 Cooling load calculation for air
conditioned rooms
DVGW technical standards
»DVGW technical standard W501 Drinking
water heating and distribution systems
»Measures to reduce the growth of le-
gionella bacteria – Design, installation,
operation and modernisation of drinking
water installations
»DVGW technical standard W551 Drinking
water heating and distribution systems;
technical measures to reduce the growth
of legionella bacteria – Design, instal-
lation, operation and modernisation of
drinking water installations
16 | System Cylinder Technical Manual www.stiebel-eltron.com
INTRODUCTION
no
Pipe content
downstream
> 3 litre
Decentralised
draw-off point
DNM, DEM, DHM
SN
SNU
UFP
Decentralised
group supply
DHE
DHB
DEL
Centralised supply
FWS 1
SBS
Decentralised group supply
SH / SHU
SHZ / HFA
LWA 100
Centralised supply
SBB
SHW / SHO AC
WPC
WWK / WWP
HSBB
LWZ
Capacity
> 400 litre
Installed in a
detached or
two-family
house
Small system in accordance with DVGW W 551 (04-2004)
Requirements (extract):
» A DHW temperature ≧ 60 °C must be possible.
» A temperature setting ≧ 50 °C is required.
» A DHW circulation line is required for line content
> 3 litres.
» The temperature spread in the DHW circulation line
must not exceed 5 K.
Large system in accordance with DVGW W 551 (04-2004)
Requirements (extract):
» The DHW temperature at the outlet must be ≧ 60 °C.
» The entire cylinder content including all pre-heating stages
must be heated to 60°C once every day.
» A DHW circulation line is required for line content > 3 litres.
» The temperature spread in the DHW circulation line must not
exceed 5 K.
No requirements in
accordance with
DVGW W 551 (04-2204)
yes
no
yes
yes
no
no
yes
Instantaneous water heater DHW cylinder
Pipe content
downstream
> 3 litre
D0000024048
The following provides an overview of the requirements to DVGWW551.
Requirements of the DVGWW551 (2004-04) Code of Practice
www.stiebel-eltron.com System Cylinder Technical Manual | 17
INTRODUCTION
SUMMARY OF FORMULAE
www.stiebel-eltron.com System cylinder Technical Manual | 17
INTRODUCTION
SUMMARY OF FORMULAE
Summary of formulae
Heat amount
Q = m
*
c
*
(t
2
- t
1
)
Q Heat amount [Wh]
m Amount of water [kg]
c Specific heat Wh/kgK [1,163Wh/kgK]
t
1
Cold water temperature [°C]
t
2
DHW temperature [°C]
Heating output
Q = A
*
k
*
∆ϑ
Q Heating output [W]
A Area [m²]
k Heat transfer coefficient [W/m²K]
∆ϕ Temperature differential [K]
k value
k =
1
+ +
1
α
i
d
λ
1
α
a
k k value [W/m²K]
α
i
Heat transfer coefficient, internal [W/m²K]
α
a
Heat transfer coefficient, external [W/m²K]
λ Thermal conductivity [W/mK]
Connected load
P =
m
*
c
*
(t
2
- t
1
)
T
*
η
P Connected load [W]
m Amount of water [kg]
c Specific heat [Wh/kgK]
t
1
Cold water temperature [°C]
t
2
DHW temperature [°C]
T Heat-up time [h]
η Efficiency
Duct work curve
∆p
1
∆p
2
V
1
2
V
2
=
( )
∆p
1
Pressure differential [Pa]
∆p
2
Pressure differential [Pa]
V
1
Flow rate [m³/h]
V
2
Flow rate [m³/h]
Heat-up time
T =
m
*
c
*
(t
2
- t
1
)
P
*
η
T Heat-up time [h]
m Amount of water [kg]
c Specific heat [Wh/kgK]
t
1
Cold water temperature [°C]
t
2
DHW temperature [°C]
P Connected load [W]
η Efficiency
Pressure drop
∆p = L
*
R + Z
∆p Pressure differential [Pa]
R Tubes frictional resistance
L Pipe length [m]
Z Pressure drop of the individual resistances [Pa]
Individual resistances
Z =
ζ
2
∑z
*
v
2
*
z Drag coefficient
(The drag coefficient "Z" can be taken from the
tables, using the sum "z" and the velocity in the
pipework.)
ς Density
v Flow velocity [m/s]
Mixed water temperature
t
m
=
(m
1
*
t
1
) + (m
2
*
t
2
)
(m
1
+ m
2
)
t
m
Mixed water temperature [°C]
t
1
Cold water temperature [°C]
t
2
DHW temperature [°C]
m
1
Amount of cold water [kg]
m
2
Amount of DHW [kg]
Amount of mixed water
m
m
=
m
2
*
(t
2
- t
1
)
t
m
- t
1
m
m
Amount of mixed water [kg]
m
1
Amount of cold water [kg]
m
2
Amount of DHW [kg]
t
m
Mixed water temperature [°C]
t
1
Cold water temperature [°C]
t
2
DHW temperature [°C]
DHW volume
m
2
=
m
m
*
(t
m
- t
1
)
t
2
- t
1
m
m
Amount of mixed water [kg]
m
1
Amount of cold water [kg]
m
2
Amount of DHW [kg]
t
m
Mixed water temperature [°C]
t
1
Cold water temperature [°C]
t
2
DHW temperature [°C]
Notes
18 | System cylinder Technical Manual www.stiebel-eltron.com
www.stiebel-eltron.com System Cylinder Technical Manual | 19
BUFFER CYLINDER
SUMMARY OF FORMULAE
www.stiebel-eltron.com System cylinder Technical Manual | 19
BUFFER CYLINDER
SUMMARY OF FORMULAE
BUFFER CYLINDER
Buffer cylinder
26_03_20_0118
20 | System Cylinder Technical Manual www.stiebel-eltron.com
BUFFER CYLINDER
SBP 100
SBP 100
Function description
Connection for quick-action
air vent valve in upper sec-
tion for optimum pressure
conditions
Highly efficient thermal in-
sulation for lowest standby
losses
Functions
The SBP 100 is the perfect companion
for small heat pump systems in detached
houses.
It acts primarily as a hydraulic separator
between the heat pump circuit flow and
the heating circuit flow.
As a compact wall mounted cylinder it can
be fitted almost anywhere in the home and
is easy to install, for example above the
heat pump.
Product features
»Wall mounted buffer cylinder
» Designed for the connection of heat
pumps
» Equipped for optional retrofitting of a
flanged immersion heater
» Connector for quick-action air vent valve
(standard delivery) in the cylinder top
» Cleaning aperture with drain & fill valve
» Wall mounting bracket for wide range of
installation options
» Highly effective thermal insulation for
low heat losses
Engineering and installation benefits
»Little space required, may be installed
anywhere, including utility rooms, re-
cesses, bathrooms or attics
»Wall mounting above the heat pump
possible, subject to model
»Straightforward installation of the indi-
rect coil connections to the side
PIC00000598
D0000026077
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