Bsi bs en 15316 3 1 2007 (2008)

BRITISH STANDARD

Heating systems in
buildings —
Method for calculation
of system energy
requirements and
system efficiencies —
Part 3-1: Domestic hot water systems,
characterisation of needs (tapping
requirements)

ICS 91.140.10

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BS EN
15316-3-1:2007


BS EN 15316-3-1:2007

National foreword
This British Standard is the UK implementation of EN 15316-3-1:2007.
The UK participation in its preparation was entrusted to Technical Committee
RHE/24, Central heating installations.
A list of organizations represented on this committee can be obtained on
request to its secretary.
This publication does not purport to include all the necessary provisions of a
contract. Users are responsible for its correct application.
Compliance with a British Standard cannot confer immunity from

legal obligations.

This British Standard was
published under the authority
of the Standards Policy and
Strategy Committee
on 29 August 2008

© BSI 2008

ISBN 978 0 580 55693 7

Amendments/corrigenda issued since publication
Date

Comments


EN 15316-3-1

EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM

October 2007

ICS 91.140.10

English Version

Heating systems in buildings - Method for calculation of system
energy requirements and system efficiencies - Part 3-1:
Domestic hot water systems, characterisation of needs (tapping
requirements)
Systèmes de chauffage dans les bâtiments - Méthode de
calcul des besoins énergétiques et des rendements des
systèmes - Partie 3-1 : Systèmes de production d'eau
chaude sanitaire, caractérisation des besoins (exigences
relatives au puisage)

Heizungsanlagen in Gebäuden - Verfahren zur Berechnung
der Energieanforderungen und Nutzungsgrade der Anlagen
- Teil 3-1: Trinkwassererwärmung, Charakterisierung des
Bedarfs (Zapfprogramm)

This European Standard was approved by CEN on 18 August 2007.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: rue de Stassart, 36

© 2007 CEN

All rights of exploitation in any form and by any means reserved
worldwide for CEN national Members.

B-1050 Brussels

Ref. No. EN 15316-3-1:2007: E


BS EN 15316-3-1:2007
EN 15316-3-1:2007 (E)

Contents

Page

Foreword..............................................................................................................................................................3
Introduction .........................................................................................................................................................5
1

Scope ......................................................................................................................................................6

2

Normative references ............................................................................................................................6

3

Terms and definitions ...........................................................................................................................6

4

Symbols, units and indices ..................................................................................................................9

5
5.1
5.2
5.3
5.3.1
5.3.2
5.3.3
5.3.4
5.3.5
5.4
5.5

Methods for calculation of energy needs for domestic hot water for different installations ........9
General....................................................................................................................................................9
Energy needs for domestic hot water based on tapping programs.................................................9
Energy needs for domestic hot water based on required volume .................................................10
General..................................................................................................................................................10
Domestic hot water delivery temperature .........................................................................................10
Cold water supply temperature ..........................................................................................................10
Domestic hot water volume ................................................................................................................10
Time periods.........................................................................................................................................11
Energy needs for domestic hot water based directly on floor area ...............................................12
Tabulated energy needs for domestic hot water..............................................................................12

Annex A (informative) Tapping programs for single family dwellings ........................................................13
Annex B (informative) Informative values for calculation of the energy needs for domestic hot
water in buildings ................................................................................................................................17
B.1
Tabulated values..................................................................................................................................17
B.2
Default values for single family dwellings ........................................................................................18
Bibliography ......................................................................................................................................................19

2


BS EN 15316-3-1:2007
EN 15316-3-1:2007 (E)

Foreword
This document (EN 15316-3-1:2007) has been prepared by Technical Committee CEN/TC 228 “Heating
systems in buildings”, the secretariat of which is held by DS.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by April 2008, and conflicting national standards shall be withdrawn at the
latest by April 2008.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association (Mandate M/343), and supports essential requirements of EU Directive
2002/91/EC on the energy performance of buildings (EPBD). It forms part of a series of standards aimed at
European harmonisation of the methodology for calculation of the energy performance of buildings. An
overview of the whole set of standards is given in prCEN/TR 15615.'
The subjects covered by CEN/TC 228 are the following:


design of heating systems (water based, electrical etc.);



installation of heating systems;



commissioning of heating systems;



instructions for operation, maintenance and use of heating systems;



methods for calculation of the design heat loss and heat loads;



methods for calculation of the energy performance of heating systems.

Heating systems also include the effect of attached systems such as hot water production systems.
All these standards are systems standards, i.e. they are based on requirements addressed to the system as a
whole and not dealing with requirements to the products within the system.
Where possible, reference is made to other European or International Standards, a.o. product standards.
However, use of products complying with relevant product standards is no guarantee of compliance with the
system requirements.
The requirements are mainly expressed as functional requirements, i.e. requirements dealing with the function
of the system and not specifying shape, material, dimensions or the like.

The guidelines describe ways to meet the requirements, but other ways to fulfil the functional requirements
might be used if fulfilment can be proved.
Heating systems differ among the member countries due to climate, traditions and national regulations. In
some cases requirements are given as classes so national or individual needs may be accommodated.

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BS EN 15316-3-1:2007
EN 15316-3-1:2007 (E)

In cases where the standards contradict with national regulations, the latter should be followed.
EN 15316 Heating systems in buildings — Method for calculation of system energy requirements and system
efficiencies consists of the following parts:
Part 1: General
Part 2-1: Space heating emission systems
Part 2-3: Space heating distribution systems
Part 3-1: Domestic hot water systems, characterisation of needs (tapping requirements)
Part 3-2: Domestic hot water systems, distribution
Part 3-3: Domestic hot water systems, generation
Part 4-1: Space heating generation systems, combustion systems (boilers)
Part 4-2: Space heating generation systems, heat pump systems
Part 4-3: Heat generation systems, thermal solar systems
Part 4-4: Heat generation systems, building-integrated cogeneration systems
Part 4-5: Space heating generation systems, the performance and quality of district heating and large volume
systems
Part 4-6: Heat generation systems, photovoltaic systems
Part 4-7: Space heating generation systems, biomass combustion systems
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech

Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and United Kingdom.

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BS EN 15316-3-1:2007
EN 15316-3-1:2007 (E)

Introduction
This European Standard is one of a number of standards that together describe methods for calculation of
system energy requirements and system efficiencies related to domestic hot water systems. In particular this
European Standard describes methods for calculation of the energy needs for domestic hot water.
The user needs to refer to other European Standards or to national documents for input data and detailed
calculation procedures not provided by this European Standard.
Only the calculation methods are normative. Values necessary to complete the calculations should be given in
a national annex. Informative values are given in informative Annex A.

5


BS EN 15316-3-1:2007
EN 15316-3-1:2007 (E)

1

Scope

This European Standard is part of a set of standards covering methods for calculation of system energy

requirements and system efficiencies of heating systems in buildings. In particular this European Standard is
one of a number of standards dealing with domestic hot water systems.
The scope of this specific part is to standardise the methods for determining the energy needs for domestic
hot water. This European Standard covers the domestic hot water needs in buildings.
The calculation of the energy needs for domestic hot water applies to a dwelling, a building or a zone of a
building.
In order to be coherent with calculation methods for space heating systems, emission losses representing
taps and control should be taken into account.

2

Normative references

Not applicable.

3

Terms and definitions

For the purposes of this document, the following terms and definitions apply.
3.1
auxiliary energy
electrical energy used by technical building systems for heating, cooling, ventilation and/or domestic hot water
to support energy transformation to satisfy energy needs
NOTE 1
This includes energy for fans, pumps, electronics etc. Electrical energy input to a ventilation system for air
transport and heat recovery is not considered as auxiliary energy, but as energy use for ventilation.
NOTE 2

In EN ISO 9488, the energy used for pumps and valves is called "parasitic energy".

3.2
building
construction as a whole, including its envelope and all technical building systems, for which energy is used to
condition the indoor climate, to provide domestic hot water and illumination and other services related to the
use of the building
NOTE
The term can refer to the building as a whole or to parts thereof that have been designed or altered to be used
separately.

3.3
building services
services provided by technical building systems and by appliances to provide indoor climate conditions,
domestic hot water, illumination levels and other services related to the use of the building
3.4
calculated energy rating
energy rating based on calculations of the weighted delivered and exported energy of a building for heating,
cooling, ventilation, domestic hot water and lighting
NOTE
National bodies decide whether other energy uses resulting from occupants' activities such as cooking,
production, laundering etc. are included or not. If included, standard input data shall be provided for the various types of
building and uses. Lighting is always included except (by decision of national bodies) for residential buildings.

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BS EN 15316-3-1:2007
EN 15316-3-1:2007 (E)

3.5

calculation period
period of time over which the calculation is performed
NOTE

The calculation period can be divided into a number of calculation steps.

3.6
cold water supply temperature
water temperature of the cold water distribution network
3.7
domestic hot water heating
process of heat supply to raise the temperature of the cold water to the intended delivery temperature
3.8
domestic hot water delivery temperature
temperature of the domestic hot water at the delivery point
3.9
energy need for domestic hot water
heat to be delivered to the needed amount of domestic hot water to raise its temperature from the cold
network temperature to the prefixed delivery temperature at the delivery point, not taking into account the
technical building thermal systems
3.10
energy use for space heating or cooling or domestic hot water
energy input to the space heating or cooling system or the domestic hot water system to satisfy the energy
need for space heating or cooling (including dehumidification) or domestic hot water, respectively
NOTE
If the technical building system serves several purposes (e.g. space heating and domestic hot water), it can be
difficult to split the energy use into that used for each purpose. It can be indicated as a combined quantity (e.g. energy
need for space heating and domestic hot water).

3.11

energy performance of a building
calculated or measured amount of energy delivered and exported actually used or estimated to meet the
different needs associated with a standardised use of the building, which may include, inter alia, energy used
for heating, cooling, ventilation, domestic hot water and lighting
3.12
energy rating
evaluation of the energy performance of a building based on the weighted sum of the calculated or measured
use of energy carriers
3.13
heating or cooling season
period of the year during which a significant amount of energy for heating or cooling is needed
NOTE

The season lengths are used to determine the operation period of technical systems.

3.14
heat recovery
heat generated by a technical building system or linked to a building use (e.g. domestic hot water) which is
utilised directly in the related system to lower the heat input and which would otherwise be wasted (e.g.
preheating of the combustion air by flue gas heat exchanger)
3.15
power shower
shower having an associated pump to increase the water flow rate and pressure

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BS EN 15316-3-1:2007
EN 15316-3-1:2007 (E)

3.16
recoverable system thermal loss
part of a system thermal loss which can be recovered to lower either the energy need for heating or cooling or
the energy use of the heating or cooling system
NOTE
This depends on the calculation approach chosen to calculate the recovered gains and losses (holistic or
simplified approach).

3.17
recovered system thermal loss
part of the recoverable system thermal loss which has been recovered to lower either the energy need for
heating or cooling or the energy use of the heating or cooling system
3.18
system boundary
boundary that includes within it all areas associated with the building (both inside and outside the building)
where energy is consumed or produced
NOTE
Inside the system boundary, the system losses are taken into account explicitly, outside the system boundary
they are taken into account by the conversion factor.

3.19
system thermal loss
thermal loss from a technical building system for heating, cooling, domestic hot water, humidification,
dehumidification, or ventilation or lighting that does not contribute to the useful output of the system
NOTE 1

A system loss can become an internal heat gain for the building, if it is recoverable.

NOTE 2
Thermal energy recovered directly in the subsystem is not considered as a system thermal loss but as heat

recovery and directly treated in the related system standard.
NOTE 3
Heat dissipated by the lighting system or by other services (e.g. appliances of computer equipment) is not part
of the system thermal losses, but part of the internal heat gains.

3.20
tapping program
24-hour cycle that defines a number of domestic hot water draw-off requirements: succession of energy needs
corresponding to uses of domestic hot water during a day
3.21
technical building system
technical equipment for heating, cooling, ventilation, domestic hot water, lighting and electricity production
composed by sub-systems
NOTE 1
A technical building system can refer to one or to several building services (e.g. heating system, space
heating and domestic hot water system).
NOTE 2

Electricity production can include cogeneration and photovoltaic systems.

3.22
technical building sub-system
part of a technical building system that performs a specific function (e.g. heat generation, heat distribution,
heat emission)

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BS EN 15316-3-1:2007
EN 15316-3-1:2007 (E)

4

Symbols, units and indices

For the purposes of this document, the following symbols and units (Table 1) and indices (Table 2) apply:
Table 1 — Symbols and units
Symbol

Name of quantity

Unit

A

area

m

C

specific heat capacity

J/(kg K)

f

conversion factor

-

N

number of operating times

-

Q

quantity of heat, energy

J

V

volume

m

x, y, z

constants

-

η

efficiency

-

θ

celsius temperature

°C

2

3

Table 2 — Indices

5

0

reference, cold water

A

floor

day

daily

del

delivered

f

per unit (to be multiplied
by f)

nday

number of days

W

domestic hot water

Methods for calculation of energy needs for domestic hot water for different
installations

5.1 General
Four methods for calculation of the energy needs for the delivered domestic hot water are described. The
methods differ as to the level of detail assumed for the domestic hot water demand; for example whether the
conditions relating to the different uses of the domestic hot water are taken into account.
A national annex may specify which method should be used for different building types. A national annex may
also specify which method is applicable for the purpose of energy labelling or any other specific use.
The calculations are based on a daily domestic hot water requirement.

5.2 Energy needs for domestic hot water based on tapping programs
This method is characterised by the use of one or more 24-hour cycles that define a number of domestic hot
water draw-off requirements.
Tapping programs may be given in a national annex and shall identify the building type(s) for which they can
be used. The tapping programs shall include the energy content of each draw-off, the corresponding delivery

temperature and the appropriate flow rate.
For single-family dwellings, the tapping programs detailed in EN 13203-2 should be used. These are given in
Annex A. Reference should be made to EN 13203-2 for a full explanation of these tapping programs.

9


BS EN 15316-3-1:2007
EN 15316-3-1:2007 (E)

NOTE
For this application, units are MJ/day, i.e. tapping program 1: 2 100 kWh/day ~ 7 560 MJ/day, tapping program
2: 5 845 kWh/day ~ 21 042 MJ/day, and tapping program 3: 11 655 kWh/day ~ 41 958 MJ/day.

The weekly, monthly or annual energy needs for domestic hot water are obtained by multiplying the energy
needs per day by the appropriate number of days. A national annex may indicate that a combination of
tapping programs may be used for these calculations.

5.3 Energy needs for domestic hot water based on required volume
5.3.1

General

This method is characterised by calculation of the required daily volume of domestic hot water.
The energy need for the domestic hot water delivered to the user

QW depends on the volume delivered and

the water temperatures. The energy need is calculated by:

QW = 4.182 ∗ VW ,day ∗ (θW ,del − θW , 0 )

(MJ/day)

(1)

where
3

VW ,day

volume of domestic hot water delivered per day at specified temperatures, m /day;

θW ,del

specified domestic hot water delivery temperature, °C;

θW , 0

cold water supply temperature, °C.

5.3.2

Domestic hot water delivery temperature

The required domestic hot water delivery temperature depends on the use. In order to achieve a consistent
basis for the calculations, values can be provided in a national annex. In the absence of a national annex, a
default delivery temperature as given in Annex B may be applied.
5.3.3

Cold water supply temperature

In some countries, variations in cold water supply temperature are sufficient to have a significant affect on the
energy requirement for domestic hot water. National values can be applied to take local variations into
account, and more than one set of temperature values can be applied to reflect differences in cold water
supply temperature in different geographical areas.
National values should be provided in a national annex.
In the absence of a national annex, a default cold water supply temperature as given in Annex B may be
applied.
5.3.4
5.3.4.1

Domestic hot water volume
General

The volume of domestic hot water,

VW ,day , is determined by the type of building and its use, and is calculated

by:

VW ,day =

10

VW , f ,day ∗ f
1000

3

(m /day)

(2)


BS EN 15316-3-1:2007
EN 15316-3-1:2007 (E)

where

VW , f ,day litres per unit per day of domestic hot water at θW ,del ;
f

number of units to be taken into account.

The values of

VW , f ,day and f depend on:



type of building;



type of activity carried out within the building;



use of a zone within a building, where more than one activity is carried out;



standard or class of activity, such as the category of a hotel (number of stars) or the class of catering
establishment.

Alternatively, the floor area may be used for factor
National values for

f in Equation (2) with corresponding values of VW , f ,day .

VW , f ,day and factor f should be provided in a national annex. If a national annex is not

provided or does not include these values, default values given in Annex B may be applied.
5.3.4.2

Single family dwellings

The values of
of factor

VW , f ,day for single family dwellings may be given in a national annex. The corresponding value

f is the floor area of the dwelling.

Alternatively, the value of

VW , f ,day can be calculated. Calculations of VW , f ,day take into account the

requirements of smaller dwellings, where the domestic hot water requirement is larger on a floor area basis

than it is for larger dwellings. The value of VW , f ,day is calculated by:

VW , f ,day =

x ∗ Ln( f ) − y
f

VW , f ,day = z
where x ,

2

if

2

if minimum level <

l/m per day

l/m per day

f > threshold level
f < threshold level

(3)

(4)

y and z are constants.

Values for x , y and z as well as for the threshold level and minimum level of factor f may be given in a
national annex. If a national annex is not provided or does not include these values, informative values given
2
in Annex B may be applied. These values are based on a domestic hot water requirement in litres per m per
day at θW ,del .
National regulations may require the domestic hot water requirements for single-family dwellings to be
calculated separately for the kitchen and the bathroom.
5.3.5

Time periods

The weekly, monthly or annual energy needs for domestic hot water are obtained by multiplying the energy
needs per day by the appropriate number of days. If different cold water supply temperatures are used for the

11


BS EN 15316-3-1:2007
EN 15316-3-1:2007 (E)

calculations, determination of the weekly, monthly or annual energy needs for domestic hot water is based on
the number of days associated with each cold water supply temperature used. For this purpose, the number of
days associated with each cold water supply temperature used should be provided in a national annex.

5.4 Energy needs for domestic hot water based directly on floor area
This method is characterised by the assumption that there is a linear relationship between the energy needs
for domestic hot water and the floor area of the building.
In this case, the energy need for domestic hot water

QW may be calculated by:

QW = QW , A,day ∗ A

(MJ/day)

(5)

where

QW , A,day

2

is a specific energy need for domestic hot water in MJ per m per day based on a defined water
delivery temperature (e.g. 60 °C) and a defined cold water supply temperature (e.g. 10 °C);

A

2

specified floor area, m .

This approach may only be used if values for QW , A,day are given in a national annex. The national annex shall
also indicate whether the specified floor area to be applied is the net area or gross area of the building.
The weekly, monthly or annual energy needs for domestic hot water are obtained by multiplying the energy
needs per day by the appropriate number of days.

5.5 Tabulated energy needs for domestic hot water
This method is characterised by the assumption that the energy needs for domestic hot water is related to the

building type and use.
The energy needs for domestic hot water on a daily basis can be tabulated against a single parameter or
multiple parameters depending on:


type of building;



type of activity carried out within the building;



use of a zone within a building, where more than one activity is carried out;



standards or class of activity, such as the category of a hotel (number of stars) or the class of catering
establishment.

The table should be provided in a national annex.
The weekly, monthly or annual energy needs for domestic hot water are obtained by multiplying the energy
needs per day by the appropriate number of days.

12


BS EN 15316-3-1:2007
EN 15316-3-1:2007 (E)

Annex A
(informative)
Tapping programs for single family dwellings

NOTE
These tables are reproduced from EN 13203-2. Tapping program No. 2 is representative of an average
European use.

Table A.1 — Tapping program No. 1
(average daily tapping pattern for a single person, 36 litres at 60° C)
Minimum ∆θ
(for start of counting
useful energy)

°C

°C

Energy

hh/mm

kWh

1

07.00

0,105

small

15

2

07.30

0,105

small

15

3

08.30

0,105

small

15

4

09.30

0,105

small

15

5

11.30

0,105

small

15

6

11.45

0,105

small

15

7

12.45

0,315

dishwashing

8

18.00

0,105

small

15

9

18.15

0,105

household cleaning

30

10

20.30

0,420

dishwashing

11

21.30

0,525

large

No

Total

Type of
tapping

∆θ desired
(to be achieved
during tapping)

Start,
time of the
day

45

45

0

0

30

2,100

Equivalent hot water volume at
60 °C

36 litres

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BS EN 15316-3-1:2007
EN 15316-3-1:2007 (E)

Table A.2 — Tapping program No. 2 (representative of an average European use)
(average daily tapping pattern for a family with shower use, 100 litres at 60° C)

°C

°C

hh/mm

kWh

1

07.00

0,105

small

15

2

07.15

1,400

shower

30

3

07.30

0,105

small

15

4

08.01

0,105

small

15

5

08.15

0,105

small

15

6

08.30

0,105

small

15

7

08.45

0,105

small

15

8

09.00

0,105

small

15

9

09.30

0,105

small

15

10

10.30

0,105

floor cleaning

11

11.30

0,105

small

15

12

11.45

0,105

small

15

13

12.45

0,315

dishwashing

14

14.30

0,105

small

15

15

15.30

0,105

small

15

16

16.30

0,105

small

15

17

18.00

0,105

small

15

18

18.15

0,105

household cleaning

30

19

18.30

0,105

household cleaning

30

20

19.00

0,105

small

15

21

20.30

0,735

dishwashing

22

21.15

0,105

small

15

23

21.30

1,400

shower

30

Total

5,845

Equivalent hot water volume at
60 °C

14

Minimum ∆θ
(for start of counting
useful energy)

Energy

No

Type of
tapping

∆θ desired
(to be achieved
during tapping)

Start,
time of the
day

100,2 litres

30

45

45

0

0

0


BS EN 15316-3-1:2007
EN 15316-3-1:2007 (E)

Table A.3 — Tapping program No. 3
(average daily tapping pattern for a family of 3 persons with bath and shower use, 200 litres at 60° C
Minimum ∆θ
(for start of counting

useful energy)

°C

°C

Energy

hh/mm

kWh

1

07.00

0,105

small

15

2

07.05

1,400

shower

30

3

07.30

0,105

small

15

4

07.45

0,105

small

15

5

08.05

3,605

bath

6

08.25

0,105

small

15

7

08.30

0,105

small

15

8

08.45

0,105

small

15

9

09.00

0,105

small

15

10

09.30

0,105

small

15

11

10.30

0,105

floor cleaning

12

11.30

0,105

small

15

13

11.45

0,105

small

15

14

12.45

0,315

dishwashing

15

14.30

0,105

small

15

16

15.30

0,105

small

15

17

16.30

0,105

small

15

18

18.00

0,105

small

15

19

18.15

0,105

household cleaning

30

20

18.30

0,105

household cleaning

30

21

19.00

0,105

small

15

22

20.30

0,735

dishwashing

45

0

23

21.00

3,605

bath

30

0

24

21.30

0,105

small

No

Total

Type of
tapping

∆θ desired
(to be achieved
during tapping)

Start,
time of the
day

30

30

45

0

0

0

15

11,655

Equivalent hot water volume at
60 °C

199,8 litres

15


BS EN 15316-3-1:2007
EN 15316-3-1:2007 (E)

Table A.4 — Tapping flow rates
Type of tapping

16

Energy

Hot water flow rates
corresponding to a
temperature rise of 45 K

kWh

l/min

Household cleaning

0,105

3 + 0,5

Small

0,105

3 + 0,5

Floor cleaning

0,105

3 + 0,5

Dishwashing

0,315

4 + 0,5

Dishwashing

0,420

4 + 0,5

Dishwashing

0,735

4 + 0,5

Large (cycle no. 1)

0,525

4 + 0,5

Shower

1,400

6 + 0,5


BS EN 15316-3-1:2007
EN 15316-3-1:2007 (E)

Annex B
(informative)
Informative values for calculation of the energy needs

for domestic hot water in buildings

B.1

Tabulated values

Informative values of VW , f ,day and factor f are given in Table B.1.
These values are based on a domestic hot water delivery temperature of 60 °C and a cold water supply
temperature of 13,5 °C.
Table B.1 — Values for calculation of domestic hot water
requirements for buildings
Type of activity

VW , f ,day

f

l/unit/day

unit

See B.2

Floor area (m²)

Accommodation

28

Number of beds

Health establishment without accommodation

10

Number of beds

Health establishment with accommodation −
without laundry

56

Number of beds

Health establishment with accommodation −
with laundry

88

Number of beds

Dwelling

Education
Offices

Hot water requirements not
taken into account

Theatres and lecture theatres

Shops
Catering, 2 meals per day.
Traditional cuisine

21

Number of guests
per meal

Catering, 2 meals per day.
Self service

8

Number of guests
per meal

Catering, 1 meal per day.
Traditional cuisine

10

Number of guests
per meal

Catering, 1 meal per day.
Self service

4

Number of guests
per meal

17


BS EN 15316-3-1:2007
EN 15316-3-1:2007 (E)

Table B.1 — Values for calculation of domestic hot water
requirements for buildings
Type of activity

VW , f ,day

f

l/unit/day

unit
Number of beds

Hotel, 1-star, without laundry

56

Hotel, 1-star, with laundry

70

Hotel, 2-star, without laundry

76

Number of beds

Hotel, 2-star, with laundry

90

Number of beds

Hotel, 3-star, without laundry

97

Number of beds

Hotel, 3-star, with laundry

111

Number of beds

Hotel, 4-star and GC, without laundry

118

Number of beds

Hotel, 4-star and GC, with laundry

132

Number of beds

Sports establishment

101

Number of showers
installed

Storage

Number of beds

Hot water requirements
taken into account

not

Industry
Transport
Other

B.2

Default values for single family dwellings

For single family dwellings, the value of VW , f ,day is calculated according to Equations (3) and (4) in 5.3.4.2.
Default values for x , y , z , minimum level and threshold level are:
x = 39,5 litres/day

y = 90,2 litres/day
2

z = 1,49 litres/m per day

minimum level = 14 m

2

threshold level = 27 m

18

2