EN 13203-2:2018

SLOVENSKI STANDARD
01-april-2019
Nadomešča:
SIST EN 13203-2:2015
Plinske gospodinjske naprave za pripravo tople sanitarne vode - 2. del:
Ocenjevanje rabe energije
Gas-fired domestic appliances producing hot water - Part 2: Assessment of energy
consumption
Gasbeheizte Geräte für die sanitäre Warmwasserbereitung für den Hausgebrauch - Teil
2: Bewertung des Energieverbrauchs
Appareils domestiques produisant de l'eau chaude sanitaire utilisant les combustibles
gazeux - Partie 2 : Evaluation de la consommation énergétique
Ta slovenski standard je istoveten z: EN 13203-2:2018
ICS:
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 13203-2
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2018
EUROPÄISCHE NORM
ICS 91.140.65 Supersedes EN 13203-2:2015
English Version
Gas-fired domestic appliances producing hot water - Part
2: Assessment of energy consumption
Appareils domestiques produisant de l'eau chaude Gasbeheizte Geräte für die sanitäre
sanitaire utilisant les combustibles gazeux - Partie 2 : Warmwasserbereitung für den Hausgebrauch - Teil 2:
Évaluation de la consommation énergétique Bewertung des Energieverbrauchs
This European Standard was approved by CEN on 26 October 2018.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13203-2:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General test conditions . 8
4.1 Reference conditions . 8
4.2 Measurement uncertainties . 8
4.2.1 General . 8
4.2.2 Steady state conditions . 9
4.3 Test conditions . 9
4.3.1 General . 9
4.3.2 Test room . 9
4.3.3 Water supply . 9
4.3.4 Initial adjustment of the appliance . 10
4.3.5 Conditions for the determination of the maximum load profile . 10
4.3.6 Electrical supply . 10
5 Determination of the energy consumption of the appliance . 11
5.1 General . 11
5.2 Load profiles . 11
5.3 Determination of the energy recovered by the useful water . 18
5.4 Calculation of gas energy . 19
5.4.1 Calculation of daily gas energy consumption in summer mode . 19
5.4.2 Calculation of daily gas energy consumption in winter mode . 19
5.4.3 Daily gas energy consumption seasonally weighted . 20
5.5 Calculation of daily electrical energy consumption . 20
5.6 Measurement of energy consumption in standby mode . 21
5.6.1 General . 21
5.6.2 Calculation of daily gas energy consumption in standby mode . 21
5.6.3 Calculation of daily auxiliary electrical energy consumption in standby mode . 22
5.7 Determination of daily auxiliary electrical energy consumption in off mode . 22
6 Determination of the ratio of wasted water to total water . 22
7 Eco design Related Products Data . 23
7.1 Water heating energy efficiency . 23
7.2 Annual fuel consumption (AFC) . 24
7.3 Annual electricity consumption (AEC) . 25
7.4 Mixed water at 40°C (V40) for storage water heaters . 25
Annex A (informative)  Test conditions . 28
Annex B (informative)  Test rig and measurement devices . 31
B.1 General . 31
B.2 Pressure measurement . 32
B.3 Temperature measurement . 32
Annex C (informative) Declaration of the Maximum Load Profile . 36
Annex ZA (informative) Relationship between this European Standard and the ecodesign
requirements of Commission Regulation (EU) n° 814/2013 [OJEU L239 of 6 September
2013] aimed to be covered . 37
Annex ZB (informative) Relationship between this European Standard and the energy labelling
requirements of Commission Delegated Regulation (EU) No 812/2013 [OJEU L239 of 6
September 2013] aimed to be covered . 38
Annex ZC (informative) Relationship between this European Standard and the ecodesign
requirements of Commission Regulation (EU) n° 813/2013 [OJEU L239 of 6 September
2013] aimed to be covered . 39
Annex ZD (informative) Relationship between this European Standard and the energy labelling
requirements of Commission Delegated Regulation (EU) No 811/2013 [OJEU L239 of 6
September 2013] aimed to be covered . 40
Bibliography . 41
European foreword
This document (EN 13203-2:2018) has been prepared by Technical Committee CEN/TC 109 "Central heating
boilers using gaseous fuels", the secretariat of which is held by NEN.
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 June 2019, and conflicting national standards shall be withdrawn at
the latest by June 2019.
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 13203-2:2015.
The main technical changes compared to EN 13203-2:2015 are the following:
— improvement of the test conditions (e.g. water supply, initial adjustment of the appliance);
— addition of further load profile XS for small appliances;
— addition of new clause dealing with mixed water at 40°C (V40) for storage water heaters and
corresponding complement to Annex ZA (informative);
— addition of new Annex C (informative) dealing with the declaration of the maximum load profile.
The main purpose of this revision is to provide a means of conforming to requirements of Commission
Delegated Regulation (EC) n° 813/2013, (EC) n° 811/2013, (EC) n° 812/2013 and (EC) n° 814/2013.
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 Regulation(s).
For relationship with EU Directive(s), see informative Annex ZA, ZB, ZC or ZD, 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Introduction
The safety operation of the boiler or water heater is not covered by this standard. Safety should be proved by
means of the essential safety requirements of the Gas Appliances Regulation 2016/426/UE. This may be
achieved by compliance with the appropriate existing harmonized standards.
NOTE Useful standards are EN 26, EN 89, EN 15502-1, EN 15502-2-1 and EN 15502-2-2.
1 Scope
This document is applicable to gas-fired appliances producing domestic hot water. It applies to both
instantaneous and storage tank appliances; waters-heaters and combination boilers that have:
— a heat input not exceeding 400 kW; and
— a hot water storage tank capacity (if any) not exceeding 2000 l.
In the case of combination boilers, with or without storage tank, domestic hot water production is integrated
or coupled, the whole being marketed as a single unit.
EN 13203-1 sets out in qualitative and quantitative terms the performance in delivery of domestic hot water
for a selected variety of uses. It also gives a system for presenting the information to the user. The present
document sets out a method for assessing the energy performance of the appliances. It defines a number of
daily load profiles for each domestic hot water use, kitchen, shower, bath and a combination of these, together
with corresponding test procedures, enabling the energy performances of different gas-fired appliances to be
compared and matched to the needs of the user. Where other technologies are combined with a gas-fired
boiler or a water heater to produce domestic hot water, specific parts of EN 13203 apply.
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 http://www.iso.org/obp
3.1
storage tank
reservoir for domestic hot water
3.2
nominal domestic hot water heat input (Q )
nw
value of the heat input for the production of domestic hot water stated in the instructions
— Symbol: Q
nw
— Unit: kilowatt (kW)
3.3
summer mode
conditions during which the appliance supplies energy only for the production of domestic hot water
3.4
winter mode
conditions during which the combination boiler supplies energy for the production of domestic hot water and
space heating
3.5
domestic water test temperature
temperature of the delivered water at which the tests are conducted
3.6
control cycle
the time cycle for keeping components and/or the storage tank (if any) of the domestic hot water circuit at
predetermined temperature level, consists of an «ON» duration time during which the heating of the domestic
hot water (by gas energy and/or auxiliary energy) is operating, and an «OFF» duration time during which no
heating occurs
3.7
useful water
quantity of water delivered at the tap for which the temperature increase is in accordance with the
requirement fixed for each individual delivery of the load profiles
3.8
wasted water
quantity of water delivered at the tap for which the temperature increase is not in accordance with the
requirement fixed for each individual delivery of the load profiles
3.9
stand by mode
operating state in which the appliance can provide domestic hot water at any time
Note 1 to entry: In the case of an appliance with a control cycle for keeping components and/or the storage tank (if
any) of the domestic hot water circuit at predetermined temperature level no draw-off is made.
3.10
off mode
state of an appliance, selected by the user, in which domestic hot water cannot be provided
3.11
useful water flow rate (D )
useful
quantity of water delivered by unit time at the tap for which the temperature increase is in accordance with
the requirement fixed for each individual draw-off of the load profiles
3.12
useful water temperature
water temperature, expressed in degrees Celsius, delivered at the tap
3.13
appliance flow rate
quantity of water delivered by the appliance by unit time before the mixing device, if applicable
3.14
appliance water temperature (T )
d
water temperature, expressed in degrees Celsius, delivered by the appliance before the mixing device
3.15
water temperature rise (∆T ) in K
m
difference between the useful water temperature and the cold water temperature, at which hot water is
contributing to the reference energy as specified in the load profiles
3.16
water temperature rise for basin draw-off types (∆T ) in K
p
difference between the useful water temperature and the cold water temperature, to be achieved during the
water draw-offs, with a minimum value as specified in the load profiles
Note 1 to entry: The minimum temperature difference for basin draw-offs as specified in the load profiles shall be
achieved at least once during the water draw-offs.
3.17
rapid response temperature sensor
measuring instrument with a response time such that 90 % of the final temperature rise, from 15 °C to 100 °C,
is obtained within about 1 s, when the sensor is plunged into still water
4 General test conditions
4.1 Reference conditions
Unless otherwise stated, the general test conditions shall be as follows:
— cold water temperature: 10 °C;
— maximum average variation over the test period: ± 2 K;
— cold water pressure: (2 ± 0,1) bar;
— ambient air temperature: 20 °C;
— maximum average variation over the test period ± 2 K;
— maximum individual variation during the tests ± 2 K;
— electrical supply voltage: (230 ± 2) V (single phase).
4.2 Measurement uncertainties
4.2.1 General
Except where otherwise stated in the clauses describing the tests, the uncertainties of measurements carried
out shall not be greater than the maximum uncertainties indicated below.
The standard deviations shall be evaluated taking into account the various sources of uncertainty:
contribution from the instrument, repeatability, calibration, ambient conditions, etc.
— water flow rate: ± 1 %;
— gas flow rate: ± 1 %;
— time: ± 0,2 s;
— temperatures:
— ambient: ± 1 K;
— water: ± 0,5 K;
— gas: ± 0,5 K;
— gas pressure: ± 1 %;
— gas calorific value: ± 1 %;
— gas density: ± 0,5 %;
— electrical energy: ± 2 %.
The stated measurement uncertainties relate to individual measurements. For measurements that combine a
number of individual measurements, smaller uncertainties on the individual measurements may be necessary
to ensure a total uncertainty within ± 2 % under the steady state conditions as defined by 4.2.2.
These uncertainties correspond to two standard deviations (2σ).
4.2.2 Steady state conditions
Steady state operating conditions are regarded as established when the appliance operates for sufficient time
to reach thermal stabilization.
To reach the steady state the water temperature at the outlet of the appliance shall not vary by more than ±
0,5 K.
NOTE This condition can be reached with a gas which is different from the reference gas, provided that the
appliance is supplied with the reference gas for at least 5 min before the requirements are verified.
4.3 Test conditions
4.3.1 General
Except where otherwise stated, the appliance is tested under the following conditions.
For combination gas boiler, the tests shall be carried out only in summer mode as defined in 3.3, and the
appliance shall be set in summer mode.
For all tests defined by this standard, the same adjustment of the appliance shall be maintained.
The load profile used for the measurement shall be the one declared according to the technical instruction of
the appliance (see also Annex C).
The tests shall be performed in the setting in which the appliance is delivered, and which is documented as
such in the technical instructions.
If there are temporary user's settings (automatically self-resetting within 24 h), these shall not be active.
4.3.2 Test room
The appliance shall be installed in a well-ventilated, draught-free room (air speed less than 0,5 m/s).
The appliance shall be protected from direct solar radiation and radiation from heat generators.
4.3.3 Water supply
For the tests:
— the domestic water pressure is the static inlet pressure under dynamic conditions measured as close as
possible to the appliance (see Figure B.2);
— the inlet and outlet temperatures of the domestic water shall be measured in the centre of the flow and as
close as possible to the appliance (see Figure B.3) or at the tap.
The inlet temperatures shall be measured immediately upstream of the water inlet connection. Except where
otherwise stated, the outlet temperatures shall be measured immediately downstream of the outlet
connection or, in the case of an appliance with spout delivery, by means of an immersed temperature
measuring device, e.g. a u-tube fitted at the outlet of a tube of the same length as the minimum length of the
spout normally supplied together with the appliance.
Water temperatures shall be measured with a rapid response temperature sensor.
4.3.4 Initial adjustment of the appliance
The appliance shall be installed in accordance with the installation instructions.
The heat input shall be adjusted to within ± 2 % of the nominal domestic hot water heat input.
The adjustment of the appliance water temperature (T ) shall be as follows (see Figure A.1 and Figure A.2):
d
a) Appliances with an adjustable temperature: the tests shall be carried out at a temperature not greater
than 65 °C, with a minimum temperature increase of 45 K above the water inlet temperature. For the load
profile XS the minimum temperature setting shall be equal to or greater than 35°C (∆T 25 K above water
inlet temperature).
b) Appliances with a fixed temperature: the tests shall be carried out at the temperature specified in the
appliance documentation, with a minimum temperature increase of 45 K above the water inlet
temperature. For the load profile XS the minimum temperature setting shall be equal to or greater than
35°C (∆T 25 K above water inlet temperature)
NOTE The test conditions of 4.3.1 are applicable.
The same conditions of initial adjustment stated in the appliance documentation shall be used for all the tests.
These conditions shall be included in the test report.
4.3.5 Conditions for the determination of the maximum load profile
The measurement of the domestic hot water efficiency shall be performed with the maximum load profile or
the one just below this load profile:
a) Instantaneous appliances shall be set to the nominal heat input as stated on the data plate. If the user
instructions specify that it is possible to adjust the outlet temperature, this temperature shall be set to the
maximum possible value not exceeding 65°C.
b) Storage appliances shall be set to the nominal heat input as stated on the data plate. If the user
instructions specify that different modes are possible to be selected, the one that is able to store more
energy and that delivers more hot water during a 24 hours period shall be used.
NOTE 1 See Annex C (informative).
NOTE 2 In case of declared maximal load profile 3XL or 4XL the load profile for testing should be XXL.
The load profile as used for the domestic hot water performance test shall be stated in the user instructions.
4.3.6 Electrical supply
The appliance shall be supplied with the nominal voltage stated in the installation instructions.
5 Determination of the energy consumption of the appliance
5.1 General
This clause defines the test methods to be employed in determining the energy consumption of appliances.
5.2 Load profiles
All patterns define a 24 h measurement cycle and within that cycle the starting times and the total energy
content (in kWh equivalent of hot water tapped) of each draw-off are defined.
Furthermore, the draw-off can be characterized in two ways, either “basin” type draw-off versus “continuous
flow” draw-off.
The aim of the “basin” type is to arrive at an average temperature of the tub, so all supplied energy can be
considered useful from the very beginning of the draw-off (minimum useful temperature rise is 0 K). The
temperature rise (ΔTp) to be achieved during tapping, shall be 30 K for floor cleaning and bath and 45 K for
the dish washes.
The aim of the “continuous flow” type is to use only the water with a minimum temperature. For the shower,
household cleaning and large draw-offs a temperature rise of 30 K shall be reached before counting the useful
energy. For the small draw-offs a temperature rise (ΔTm) of 15 K shall be reached.
NOTE 1 The temperature rises (in K) based on 10 °C inlet water temperature stated above are equivalent to the
temperatures (in °C) given by the load profiles tables in Regulations n° 811/2013, n° 812/2013, n° 813/2013 and n°
814/2013. The tapping flow rates used to perform the different draw-offs of each of the eight load profiles are defined by
Tables 1 to 8.
When these water draw-off flow rates result in a tapping period of less than 15 s the water flow rate should
be decreased such that the tapping period is (16 ± 1) s.
In the load profiles, the requirements for water flow rate and temperatures are based on the delivery at the
tap in a mix of hot and cold water. Under the conditions of the initial adjustment, the appliance itself produces
hot water with a minimum temperature rise of 45 K. For the load profile XS the minimum temperature setting
shall be equal to or greater than 35°C (∆T 25 K above water inlet temperature).
To fulfil the requirements stated in Tables 1 to 8 mixing hot water from the appliance with cold water of 10 °C
at the tap is allowed either by using a mixing device (see Figures B.1 and B.5) or by recalculating the appliance
flow rate (D ) according to the following formula:
min
∆T
useful
D = D (1)
min useful
∆T
d
where
D is the minimum test rig setting for the appliance flow rate of each individual draw-off
min
at temperature rise corresponding to ΔT , in l/min;
d
D is the useful water flow rate according to Tables 1 to 8, in l/min;
useful
ΔT is the appliance water temperature rise, with a minimum of 30 K;
d
ΔT is the higher value between the temperature rise to be achieved and the minimum
useful
temperature rise for counting the useful energy according to Tables 1 to 8.
If the appliance cannot deliver these flow rates, for instance due to the flow restrictor, it shall be checked that
the requirements are fulfilled by checking that (D ) is delivered.
min
If by design the appliance is fitted with a flow restrictor, the tests shall be carried out with this flow restrictor.
The tests shall be performed by using the useful water flow rates defined by Tables 1 to 8.
Table 1 — Load profile XS
Start Energy Type of draw-off Useful ΔTp to be Minimum
Draw-off
n° (kWh) water flow achieved ΔTm for
(h:min)
rate at the during counting
tap tapping useful energy
(l/min) (K) (K)
1 07:30 0,525 Medium 3  25
2 12:45 0,525 Medium 3  25
3 20:30 1,050 Large 3  25
Q 2,100
ref
Equivalent hot water litres at 60°C 36
Table 2 — Load profile S
Draw-off Start Energy Type of draw-off Useful ΔTp to be Minimum
n° (kWh) water flow achieved ΔTm for
(h:min)
rate at the during counting
tap tapping useful energy
(l/min) (K) (K)
1 07:00 0,105 Small 3  15
2 07:30 0,105 Small 3  15
3 08:30 0,105 Small 3  15
4 09:30 0,105 Small 3  15
5 11:30 0,105 Small 3  15
6 11:45 0,105 Small 3  15
7 12:45 0,315 Dish washing n°1 4 45 0
8 18:00 0,105 Small 3  15
9 18:15 0,105 Household cleaning 3  30
10 20:30 0,420 Dish washing n°2 4 45 0
11 21:30 0,525 Large 5  35
Q 2,100
ref
Equivalent hot water litres at 60°C 36
Table 3 — Load profile M
Draw- Start Energy Type of draw-off Useful ΔTp to be Minimum
water achieved ΔTm for
off n° (h:min) (kWh)
flow rate during counting
at the tap tapping useful energy
(l/min) (K) (K)
1 07:00 0,105 Small 3  15
2 07:05 1,400 Shower n°1 6  30
3 07:30 0,105 Small 3  15
4 08:01 0,105 Small 3  15
5 08:15 0,105 Small 3  15
6 08:30 0,105 Small 3  15
7 08:45 0,105 Small 3  15
8 09:00 0,105 Small 3  15
9 09:30 0,105 Small 3  15
10 10:30 0,105 Floor cleaning 3 30 0
11 11:30 0,105 Small 3  15
12 11:45 0,105 Small 3  15
13 12:45 0,315 Dish washing n°1 4 45 0
14 14:30 0,105 Small 3  15
15 15:30 0,105 Small 3  15
16 16:30 0,105 Small 3  15
17 18:00 0,105 Small 3  15
18 18:15 0,105 Household cleaning 3  30
19 18:30 0,105 Household cleaning 3  30
20 19:00 0,105 Small 3  15
21 20:30 0,735 Dish washing n°3 4 45 0
22 21:15 0,105 Small 3  15
23 21:30 1,400 Shower n°1 6  30
Q 5,845
ref
Equivalent hot water litres at 60 °C 100,2
Table 4 — Load profile L
Draw- Start Energy Type of draw-off Useful ΔTp to be Minimum
achieved ΔTm for
off n° (h:min) (kWh) water
flow rate during counting
at the tap tapping useful
energy
(l/min) (K)
(K)
1 07:00 0,105 Small 3  15
2 07:05 1,400 Shower n°1 6  30
3 07:30 0,105 Small 3  15
4 07:45 0,105 Small 3  15
5 08:05 3,605 Bath n°1 10 30 0
6 08:25 0,105 Small 3  15
7 08:30 0,105 Small 3  15
8 08:45 0,105 Small 3  15
9 09:00 0,105 Small 3  15
10 09:30 0,105 Small 3  15
11 10:30 0,105 Floor cleaning 3 30 0
12 11:30 0,105 Small 3  15
13 11:45 0,105 Small 3  15
14 12:45 0,315 Dish washing n°1 4 45 0
15 14:30 0,105 Small 3  15
16 15:30 0,105 Small 3  15
17 16:30 0,105 Small 3  15
18 18:00 0,105 Small 3  15
19 18:15 0,105 Household cleaning 3  30
20 18:30 0,105 Household cleaning 3  30
21 19:00 0,105 Small 3  15
22 20:30 0,735 Dish washing n°3 4 45 0
23 21:00 3,605 Bath n°1 10 30 0
24 21:30 0,105 Small 3  15
Q 11,655
ref
Equivalent hot water litres at 60 °C 199,8
Table 5 — Load profile XL
Draw-off n° Start Energy (kWh) Type of draw-off Useful water ΔTp to be Minimum ΔTm
(h:min) flow rate at achieved for counting
the tap during useful energy
tapping
(l/min) (K)
(K)
1 07:00 0,105 Small 3  15
2 07:15 1,820 Shower n°2 6  30
3 07:26 0,105 Small 3  15
4 07:45 4,420 Bath n°2 10 30 0
5 08:01 0,105 Small 3  15
6 08:15 0,105 Small 3  15
7 08:30 0,105 Small 3  15
8 08:45 0,105 Small 3  15
9 09:00 0,105 Small 3  15
10 09:30 0,105 Small 3  15
11 10:00 0,105 Small 3  15
12 10:30 0,105 Floor cleaning 3 30 0
13 11:00 0,105 Small 3  15
14 11:30 0,105 Small 3  15
15 11:45 0,105 Small 3  15
16 12:45 0,735 Dish washing n°3 4 45 0
17 14:30 0,105 Small 3  15
18 15:00 0,105 Small 3  15
19 15:30 0,105 Small 3  15
20 16:00 0,105 Small 3  15
21 16:30 0,105 Small 3  15
22 17:00 0,105 Small 3  15
23 18:00 0,105 Small 3  15
24 18:15 0,105 Household cleaning 3  30
25 18:30 0,105 Household cleaning 3  30
26 19:00 0,105 Small 3  15
27 20:30 0,735 Dish washing n°3 4 45 0
28 20:46 4,420 Bath n°2 10 30 0
29 21:15 0,105 Small 3  15
30 21:30 4,420 Bath n°2 10 30 0
Q 19,070
ref
Equivalent hot water litres at 60°C 325
Table 6 — Load profile XXL
Draw- Start Energy Type of draw-off Useful ΔTp to be Minimum
off n° (h:min) (kWh) water achieved ΔTm for
flow rate during counting
at the tap tapping useful energy
(K)
(l/min) (K)
1 07:00 0,105 Small 3  15
2 07:15 1,820 Shower n°2 6  30
3 07:26 0,105 Small 3  15
4 07:45 6,240 Shower + bath 16 30 0
5 08:01 0,105 Small 3  15
6 08:15 0,105 Small 3  15
7 08:30 0,105 Small 3  15
8 08:45 0,105 Small 3  15
9 09:00 0,105 Small 3  15
10 09:30 0,105 Small 3  15
11 10:00 0,105 Small 3  15
12 10:30 0,105 Floor cleaning 3 30 0
13 11:00 0,105 Small 3  15
14 11:30 0,105 Small 3  15
15 11:45 0,105 Small 3  15
16 12:45 0,735 Dish washing n°3 4 45 0
17 14:30 0,105 Small 3  15
18 15:00 0,105 Small 3  15
19 15:30 0,105 Small 3  15
20 16:00 0,105 Small 3  15
21 16:30 0,105 Small 3  15
22 17:00 0,105 Small 3  15
23 18:00 0,105 Small 3  15
24 18:15 0,105 Household cleaning 3  30
25 18:30 0,105 Household cleaning 3  30
26 19:00 0,105 Small 3  15
27 20:30 0,735 Dish washing n°3 4 45 0
28 20:46 6,240 Shower + bath 16 30 0
29 21:15 0,105 Small 3  15
30 21:30 6,240 Shower + bath 16 30 0
Q 24,530
ref
Equivalent hot water litres at 60 °C 420
Table 7 — Load profile 3XL
Draw- Start Energy Type of draw-off Useful ΔTp to be Minimum
water achieved ΔTm for
off n° (h:min) (kWh)
flow rate during counting
at the tap tapping useful energy
(l/min) (K) (K)
1 07:00 11,2 General use n°3 48  30
2 08:01 5,04 General use n°8 24  15
3 09:00 1,68 General use n°9 24  15
4 10:30 0,84 General use n°10 24 30 0
5 11:45 1,68 General use n°9 24  15
6 12:45 2,52 General use n°11a 32 45 0
7 15:30 2,52 General use n°11 24  15
8 18:30 3,36 General use n°12 24  15
9 20:30 5,88 General use n°13 32 45 0
10 21:30 12,04 General use n°5 48  30
Q 46,76
ref
Equivalent hot water litres at 60 °C 800
Table 8 — Load profile 4XL
Draw- Start Energy Type of draw-off Useful ΔTp to be Minimum
off n° (h:min) (kWh) water achieved ΔTm for
flow rate during counting
at the tap tapping useful energy
(l/min) (K) (K)
1 07:00 22,4 General use n°6 96  30
2 08:01 10,08 General use n°2 48  15
3 09:00 3,36 General use n°12a 48  15
4 10:30 1,68 General use n°9a 48 30 0
5 11:45 3,36 General use n°12a 48  15
6 12:45 5,04 General use n°8b 64 45 0
7 15:30 5,04 General use n°8a 48  15
8 18:30 6,72 General use n°1 48  15
9 20:30 11,76 General use n°4 64 45 0
10 21:30 24,08 General use n°7 96  30
Q 93,52
ref
Equivalent hot water litres at 60 °C 1600
There are eight different load profiles, depending on the use.
For each use, the load profile(s) is (are) based respectively on Tables 1 to 8. Each individual draw-offs of the
load profiles shall be completed, that means the valve shall be closed, and a delay of at least one minute is
required, before starting the following delivery.
Beginning and ending of the load profiles:
— for appliances with no energy consumption between deliveries (neither gas nor electricity), the measured
programme starts at 07h00 with the appliance cold and finishes when the burner is extinguished after
the 21h30 tapping (see Figure A.3).
— for appliances with energy consumption between deliveries (either gas or electricity or both), the
tappings start with the tapping at 21h30. The measured cycle starts from the time the burner is
extinguished following the 21h30 delivery. The measured cycle ends when the burner is extinguished
following the last tapping at 21h30 on the next day.
It shall be ensured that the energy content at the beginning and at the end of the test is the same.
NOTE 2 The above indicated test conditions ensure that the test results are equivalent to the required measurement
conditions of Regulations n° 811/2013, n° 812/2013, n° 813/2013 and n° 814/2013.
NOTE 3 This measurement can be performed after a 24 h preliminary load profile in order to ensure the thermal
stabilization.
NOTE 4 The energy not directly used for water heating (for example: standby, pilot flame) will be considered as
energy consumption.
5.3 Determination of the energy recovered by the useful water
The appliance shall be installed and adjusted in the initial state conditions and in the initial adjustment
conditions defined in 4.3.4.
The useful energy recovered by the water Q (kWh) is given according to the following formula:
H O
t
n i
Q c DT⋅∆ ()t dt (2)
∑
H O w ii
∫
i=1
where
N is the number of draw-offs;
D is the water flow rate delivered at the tap, in l/min;
i
ΔT (t) is the instantaneous temperature rise during the tapping, in K;
i
t is the tapping duration of the useful water, in min;
i
c -3
w is the specific heat capacity of water (1,163.10 kWh/l.K).
The useful energy recovered at each individual draw-off shall be set against the values given in Tables 1 to 8.
For each individual draw-off, the accuracy of the value shall be ± 10 Wh or ± within 2 % of the energy content
of this specific individual draw-off. For the overall load profile the accuracy of the value shall be within ± 2 %.
=
5.4 Calculation of gas energy
5.4.1 Calculation of daily gas energy consumption in summer mode
The daily gas energy consumption in summer mode shall be calculated according to the following formula:
V ⋅K⋅NCV⋅Q
g ref
Q = (3)
gas,S
Q
H O
where
Q is the daily gas energy consumption in summer mode calculated using NCV, in kWh;
gas,S
V 3
g is the measured gas consumption during the load profile, in m ;
NCV 3
is the net calorific value (at 15 °C and 1013,25 mbar), in kWh/m ;
Q is the measured energy recovered by the water according to 5.3, in kWh;
H O
Q is the total delivered energy by the load profile , value from Tables 1 to 8, in kWh.
ref
and
pp+
ag 288,15
K ⋅ (4)
1013,,25 T + 273 15
g
where
p is the atmospheric pressure, in
a
mbar;
p is the gas pressure, in mbar;
g
T is the gas temperature, in °C.
g
5.4.2 Calculation of daily gas energy consumption in winter mode
For all water heaters Q is equal to Q .
gas,W gas,S
For the combination boilers, with a heat input above 70 kW, Q is equal to Q
gas,W gas,S
For the combination boilers, with storage capacity above 500 l, Q is equal to Q
gas,W gas,S.
For the combination boilers, with heat input below 70 kW and with storage capacity below 500 l, the daily gas
energy consumption in winter mode shall be calculated according to the following formula:
Q
gas,S
Q = (5)
gas,W
 
η × Q
CH−nom gas,S
 
1+ 0,5⋅ − 1
 Q 
ref
 
where
Q is the daily gas energy consumption calculated in winter mode using NCV, in kWh;
gas,W
Q is the daily gas energy consumption calculated in summer mode using NCV according to
gas,S
5.4.1, in kWh;
=
is the useful efficiency at nominal heat input and at an average temperature of 70 °C for the
η
CH−nom
space heating function;
Q is the total energy delivered of the load profile used, value from Tables 1 to 8, in kWh.
ref
NOTE Unlike water heaters combination boilers have two functions in the winter mode, space heating and domestic
hot water. They switch between space heating and domestic hot water functions to fulfil demands as required by the
control system.
In the summer mode the combination boiler is 24 h in domestic hot water mode or standby mode.
The combination boiler in winter mode spends most of the demand time on space heating, outside any night
(or day) set-back periods (which require a lower room temperature and hence heating load).
When a combination boiler switches from space heating to domestic hot water mode and back to space
heating the standby losses usually generated from the domestic hot water mode are not lost but are instead
used in the space heating mode.
That means combination heaters have lower domestic hot water heat losses in winter mode than in summer
mode.
These energy saving benefits of combination boilers will be taken into account.
5.4.3 Daily gas energy consumption seasonally weighted
The daily gas energy consumption is weighted, to take into account both summer and winter modes, by the
following formula:
D D
W S
Q = Q ⋅ +⋅Q (6)
gas,p gas,W gas,S
D + D D + D
WS WS
where
Q is the weighted daily gas energy consumption calculated using NCV, in kWh;
gas,p
Q is the daily gas energy consumption calculated in winter mode using NCV, in
gas,
kWh;
W
Q is the daily gas energy consumption in summer mode calculated using NCV, in
gas,S
kWh;
D is the number of days of winter mode, this number is equal to 200;
W
D is the number of days of summer mode, this number is equal to 165.
S
5.5 Calculation of daily electrical energy consumption
The daily electrical energy of all the electrical auxiliaries necessary to achieve the load profile(s) at nominal
use as described in the appliance documentation will be measured even if these auxiliaries are not integrated
in the appliance.
Where an electrical auxiliary (e.g. a pump) necessary for the delivery of hot water is not included as an
integral part of the appliance, then the essential characteristics of the component shall be specified in the
appliance installation instructions. An appropriate component shall be used for test procedures.
The measurement of the electrical consumption starts at the same time and finishes at the same time as the
measurement of the gas consumption.
This measurement shall be corrected according to the following formula:
Q
ref
(7)
EE ⋅
elecco elecmes
Q
HO
where
E
is the corrected total electrical energy, in kWh;
elecco
E
elecm
is the measured total electrical energy, in kWh;

es
Q
H O is the measured energy delivered to the water according to 5.3, in kWh;
Q
is the total delivered energy of used load profile , value from Tables 1 to 8, in kWh.
ref
5.6 Measurement of energy consumption in standby mode
5.6.1 General
Unless specified, the consumed energy in standby mode shall be measured for a 24 h period without tapping.
However:
— for the appliances without a control cycle the gas and auxiliary energy consumption may be measured for
a duration time equal to 1 h;
— for the appliances with repeated control cycles for a 24 h period, the gas and auxiliary energy
consumption may be measured for a duration time (t ) equal to one or several control cycles, once the
a
appliance is operating in a regular manner (see Figure A.5).
5.6.2 Calculation of daily gas energy consumption in standby mode
The daily consumption of gas in standby mode shall be calculated according to the following formula:
(8)
QV⋅ K⋅ NCV⋅
gas.stb g
t
a
where
Q
is the daily gas energy consumption in standby mode calculated using NCV, in
gas.s
kWh;
tb
V 3
g is the measured gas consumption during the test, in m ;
NCV
is the net calorific value (at 15
...