EN 15332:2019

SLOVENSKI STANDARD
01-januar-2020
Nadomešča:
SIST EN 15332:2008
Kotli za gretje - Energijsko ocenjevanje hranilnikov tople vode
Heating boilers - Energy assessment of hot water storage tanks
Heizkessel - Energetische Bewertung von Warmwasserspeichern
Chaudières de chauffage - Évaluation de la performance énergétique des préparateurs
d'eau chaude
Ta slovenski standard je istoveten z: EN 15332:2019
ICS:
27.015 Energijska učinkovitost. Energy efficiency. Energy
Ohranjanje energije na conservation in general
splošno
27.060.01 Gorilniki in grelniki vode na Burners and boilers in
splošno general
91.140.65 Oprema za ogrevanje vode Water heating equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 15332
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2019
EUROPÄISCHE NORM
ICS 91.140.65 Supersedes EN 15332:2007
English Version
Heating boilers - Energy assessment of hot water storage
tanks
Chaudières de chauffage - Évaluation énergétique des Heizkessel - Energetische Bewertung von
ballons d'eau chaude Warmwasserspeichern
This European Standard was approved by CEN on 9 September 2019.

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-CENELEC 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-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15332:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Requirements on the test rig . 7
5 Measurements . 7
Annex ZA (informative) Relationship between this European Standard and the ecodesign
requirements of Commission Regulation (EC) No [814/2013] aimed to be covered . 14
Annex ZB (informative) Relationship between this European Standard and the ecodesign
requirements of Commission Regulation (EC) No [812/2013] aimed to be covered . 15
Bibliography . 16
European foreword
This document (EN 15332:2019) has been prepared by Technical Committee CEN/TC 57 “Central
heating boilers”, the secretariat of which is held by DIN.
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 2020, and conflicting national standards shall be
withdrawn at the latest by April 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 15332:2007.
— Scope was updated
— Normative references were updated
— Terms and definitions were updated
— Evaluation of energy efficiency was introduced
— The measurement section was made more concise
— Addition of Annex ZA
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annexes ZA and ZB, which are an integral part of
this document.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
1 Scope
This document specifies a method for the energy assessment of domestic/sanitary hot water storage
tanks of up to 2 000 l.
Whilst this document does not cover water heaters intended primarily for direct heating, it does allow
the provision of electric heating elements for auxiliary use.
Primary heating buffer tanks are not covered by this document. Heat losses of domestic hot water
storage tanks integrated into combi boilers marketed as a single unit are not covered by this document.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
indirectly heated un-vented hot water storage tanks
indirectly heated closed hot water storage tanks
storage vessels used for heating up domestic hot water with an external heat source where the hot
water side is not permanently vented to the atmosphere, including all devices delivered with it
3.2
domestic water side
potable water side
side of the storage tank which contains domestic hot water
Note 1 to entry: If a mixing valve is delivered with the storage tank, it is considered to be part of the hot water
side.
3.3
heating side
side of the storage tank which contains the heating medium
3.4
temperature of the cold water
T
c
temperature at the inlet of the domestic water side of the storage tank, in °C
3.5
temperature of the warm water
T
w
temperature at the outlet of the domestic water side, in °C
3.6
usable hot water temperature
T
u
minimum temperature for the hot water to be usable
Note 1 to entry: Minimum temperature for the hot water defined here as difference between the temperature of
the warm water Tw = 40 °C minus the temperature of cold water Tc = 10 °C (Tu = Tw − Tc = 30 K).
3.7
heating medium supply temperature
T
h
heating medium temperature at the entrance of the heating side of the water heater
3.8
heating medium return temperature
T
r
heating medium temperature at the outlet of the heating side of the water heater
3.9
storage temperature
T
s
temperature of the storage tank measured at the thermostat position, which is intended for this
purpose
3.10
ambient temperature
T
amb
temperature in the environment of the hot water storage tank measured according to 5.3.1
3.11
storage excess temperature
ΔT
x
temperature difference between the storage temperature and the ambient temperature:
ΔT = T − T
x sm amb
3.12
tapping volume flow
V
w
flow of warm water through the domestic water side, in l/s
3.13
tapping mass flow
m
w
flow of warm water through the domestic water side, in kg/h
3.14
loading mass flow
m
l
flow of heating medium through the heating side, in kg/h
3.15
rated storage volume
V
R
capacity of the storage tank assigned by the manufacturer, in litres
Note 1 to entry: Rated storage volume is the sum of the domestic water side volume, heating water and the
volume in additionally heat exchangers e.g. solar systems.
3.16
actual domestic storage volume
V
capacity of the domestic water side of specific storage tank used during measurements and determined
by volume measuring or balancing, in litres
Note 1 to entry: The heat exchanger(s) is/are empty.
3.17
hot water volume
V
U
quantity of hot water, in litre, at usable temperature T which is tapped during a specifc time from the
u
charged storage tank
3.18
continuous heat exchanger input
P
e
continuous transferable heat power from the heating side to the hot water side, in kW, at standard
conditions of T = 10 °C, T = 60 °C and T = 80 °C
c w h
3.19
standing heat loss
Q
B
energy loss, in kWh/d, at 65 °C against environment with an ambient temperature of T = 20 °C, but at
amb
least 45 K excess temperature
3.20
cycle time
Δt
time interval of the data acquisition, in seconds
3.21
nominal storage temperature
T
sn
temperature of the stored water in the tank as measured by the thermostat
3.22
primary heating buffer tank
storage tank that is only filled with primary water
3.23
buffer tank
heat store filled with water, in which the contents do not come into contact with the atmosphere and
which can collect energy from various sources, store it, and deliver it at a later point in time
4 Requirements on the test rig
4.1 Environment
The ambient temperature shall be (20 ± 3) °C. The air speed where the ambient temperature is
measured (see Figure 3) shall not exceed 0,25 m/s.
The relative humidity shall be lower than 85 %.
The water heater shall be protected from radiation from the environment.
The cold water temperature T shall be between 8 °C and 18 °C and shall not vary more than ± 1 K
c
during the test.
If the cold water temperature differs from the given temperature range, the measurement shall take
place with the according temperature differences.
4.2 Measuring accuracy
4.2.1 Temperature
Temperatures shall be measured with a minimum accuracy of ± 1 K. It shall be guaranteed by
appropriate installation of the temperature probes that on the measuring points the medium caloric
temperature of the water is measured. The time constant for the temperature measurement shall not be
larger than 5 s.
4.2.2 Mass and volume flow
The mass and volume flow of the water shall be measured with minimum accuracy of 1 %.
4.2.3 Time
The time shall be measured with a minimum accuracy of ± 1 s.
4.2.4 Electrical energy
Electrical energy shall be measured with a measurement instrument with a range appropriate to the
tank being assessed, the minimum accuracy shall be 1 % or a maximum bandwidth of ± 10 Wh.
4.2.5 Measurement cycle time
The cycle time for the measurement after 5.4 shall not be larger than 10 s.
For all other measurements according to Clause 5 the cycle time should not be larger than 60 s.
4.2.6 Volume
The actual storage volume of the storage tank shall be measured within an accuracy of ± 1 %.
5 Measurements
5.1 General
The delivered storage tank, as produced by the manufacturer, shall be tested.
For storage tanks in a product range which have the same constructional design, the testing of only the
smallest and the largest storage tank shall be sufficient, provided the ratio of the nominal volume of the
smallest to largest storage tank is less than or equal to 2: 1. If, however, within the same product range,
this ratio is larger than 2: 1, then so many intermediate sizes shall be tested so that the ratio of 2: 1 from
the higher volume size to the lower volume size is not exceeded.
The manufacturer shall ensure that all storage tanks of a product range, even those which have not been
tested, conform to the requirements of this standard. The results of non-tested storage tanks shall be
determined by interpolation based on the nominal volume.
If the models of a range are not using the same insulation, e.g. for the usage of vacuum insulation panels
(VIP) then results of additional simulation tools can be used. The end results shall fulfil the required
tolerances (max. 5 %).
NOTE The standing heat loss (S) and the volume (V) as defined below are used to establish the parameters
needed for the eco-design and labelling regulations. For further information see also Annex ZA and ZB.
5.2 Connection of the storage tank
The connection to the heating source is done as indicated in the description by the manufacturer.
If there is no connection available, this can be done by an immersion heater or a connection for an
immersion heater within the lower 15 % of the storage volume.
5.3 Measurement of the standing heat loss
5.3.1 General
The standing heat loss is obtained by measuring energy input whilst the storage temperature remains
constant.
The average ambient temperature shall be T = (20 ± 3) °C. The ambient temperature T shall be
amb amb
measured at the half height and 350 mm (±25 mm) distance from the outside surface (including the
insulat
...