Gas-fired domestic appliances producing hot water - Part 5: Assessment of energy consumption of gas-fired appliances combined with electrical heat pump

This European Standard is applicable to gas-fired mCHP appliances producing domestic hot water and electricity. The electricity is generated in a process linked to the production of useful heat. It applies to a mCHP appliances marketed as single unit or as a package fully specified by a manufacturer that have:
— a gas heat input not exceeding 400 kW;
— an electrical output not exceeding 50 kW and
— a hot water storage capacity (if any) not exceeding 2000 l.
prEN 13203-1:20xx sets out in qualitative and quantitative terms the performance in delivery of domestic hot water for a 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 gas fired mCHP appliances. It defines a number of daily tapping cycles 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.
When the mCHP generator does not supply domestic hot water in the summer period, the present standard is not applicable. PrEN 13203-2:2020 is used for performance assessment of these generators.

Gasgeräte für die häusliche Warmwasserbereitung - Teil 5: Bewertung des Energieverbrauchs von gasbefeuerten Geräten in Kombination mit elektrischer Wärmepumpe

Dieses Dokument ist auf gasbefeuerte Geräte für die sanitäre Warmwasserbereitung anwendbar. Es gilt sowohl für gasbefeuerte Durchlauf-Warmwasserbereiter als auch für gasbefeuerte Vorrats-Wassererhitzer mit elektrischer Wärmepumpe.
Es gilt für Systeme, die als einzelne Einheit oder als vom Hersteller umfassend beschriebenes System vertrieben werden und die:
—   eine Wärmebelastung von höchstens 400 kW und
—   ein Warmwasser-Speichervolumen (sofern vorhanden) von höchstens 2 000 l haben.
EN 13203 1:2015 legt die Leistung bezüglich der Abgabe von sanitärem Warmwasser für eine Auswahl von Benutzungsarten qualitativ und quantitativ fest. Sie enthält zudem ein System zur Bereitstellung von Informationen für den Nutzer. Das vorliegende Dokument legt ein Verfahren zur Bewertung der Energieeffizienz von gasbefeuerten Geräten in Kombination mit einer Wärmepumpe mit elektrisch angetriebenem Verdichter nach EN 16147 fest. Es legt eine Anzahl täglicher Lastprofile für jede sanitäre Warmwasserverwendung in der Küche, zum Duschen und Baden sowie für Kombinationen dieser Verwendungsarten und die entsprechenden Prüfverfahren fest, mit denen sich das Energieverhalten unterschiedlicher gasbefeuerter Geräte vergleichen und auf die Bedürfnisse des Nutzers ausrichten lässt. Werden andere Technologien mit einem gasbefeuerten Kessel oder einem Warmwasserbereiter für die sanitäre Warmwasserbereitung kombiniert, so gelten die jeweils zutreffenden Teile von EN 13203.
Das vorliegende Dokument gilt nicht für Gasheizkessel mit Rückgewinnungssystemen, die Verbrennungs-produkte als Wärmequelle für die elektrische Wärmepumpe nutzen.
Wenn die elektrische Wärmepumpe im Sommer nicht für die häusliche sanitäre Warmwasserbereitung eingesetzt wird bzw. nicht einsetzbar ist, ist diese Norm nicht für die Bewertung der Energieeffizienz anwendbar, und es gilt statt ihrer EN 13203 2:2022.

Appareils domestiques produisant de l’eau chaude sanitaire utilisant les combustibles gazeux - Partie 5 : Évaluation de la consommation énergétique des appareils utilisant les combustibles gazeux combinés à une pompe à chaleur électrique

Le présent document s’applique aux appareils de production d’eau chaude sanitaire utilisant des combustibles gazeux. Il s’applique à la fois aux appareils instantanés et à accumulation utilisant les combustibles gazeux, combinés à une pompe à chaleur électrique.
Il s’applique à un ensemble commercialisé comme une seule unité ou entièrement spécifié par le fabricant, qui a :
-   un débit calorifique inférieur ou égal à 400 kW ; et
-   une capacité du ballon d’eau chaude (le cas échéant) inférieure ou égale à 2 000 l.
L’EN 13203-1:2015 définit, en termes qualitatifs et quantitatifs, la performance en puisage d’eau chaude sanitaire pour une variété sélectionnée d’usages. Elle mentionne également un système pour présenter les informations à l’utilisateur. Le présent document définit une méthode pour évaluer les performances énergétiques des appareils utilisant les combustibles gazeux, combinés à une pompe à chaleur équipée d’un compresseur entrainé par moteur électrique conformément à l’EN 16147. Il spécifie différents profils de soutirage journaliers pour chaque utilisation d’eau chaude sanitaire, pour la cuisine, la douche, le bain et une combinaison de ces utilisations, ainsi que les modes opératoires d’essai correspondants, ce qui permet de comparer les performances énergétiques des différents appareils utilisant les combustibles gazeux et de les adapter aux besoins de l’utilisateur. Des parties spécifiques de l’EN 13203 s’appliquent lorsque d’autres technologies sont associées à une chaudière ou un chauffe-eau utilisant les combustibles gazeux pour produire de l’eau chaude sanitaire.
Le présent document ne s’applique pas aux chaudières à gaz équipées de systèmes de récupération utilisant les produits de combustion comme source thermique pour la pompe à chaleur électrique.
Lorsque la pompe à chaleur électrique ne fonctionne pas pour produire de l’eau chaude sanitaire en régime été, la présente norme n’est pas applicable pour l’évaluation des performances énergétiques ; dans ce cas, l’EN 13203-2:2022 est applicable.

Plinske gospodinjske naprave za pripravo tople sanitarne vode - 5. del: Ocenjevanje rabe energije plinskih naprav, kombiniranih z električno toplotno črpalko

General Information

Status
Published
Public Enquiry End Date
01-Mar-2021
Publication Date
14-Nov-2022
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
26-Oct-2022
Due Date
31-Dec-2022
Completion Date
15-Nov-2022

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Standards Content (sample)

SLOVENSKI STANDARD
SIST EN 13203-5:2022
01-december-2022
Nadomešča:
SIST EN 13203-5:2019
Plinske gospodinjske naprave za pripravo tople sanitarne vode - 5. del:
Ocenjevanje rabe energije plinskih naprav, kombiniranih z električno toplotno
črpalko
Gas-fired domestic appliances producing hot water - Part 5: Assessment of energy
consumption of gas-fired appliances combined with electrical heat pump
Gasgeräte für die häusliche Warmwasserbereitung - Teil 5: Bewertung des
Energieverbrauchs von gasbefeuerten Geräten in Kombination mit elektrischer
Wärmepumpe

Appareils domestiques produisant de l’eau chaude sanitaire utilisant les combustibles

gazeux - Partie 5 : Évaluation de la consommation énergétique des appareils utilisant les

combustibles gazeux combinés à une pompe à chaleur électrique
Ta slovenski standard je istoveten z: EN 13203-5:2022
ICS:
27.080 Toplotne črpalke Heat pumps
91.140.65 Oprema za ogrevanje vode Water heating equipment
SIST EN 13203-5:2022 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 13203-5:2022
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SIST EN 13203-5:2022
EN 13203-5
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2022
EUROPÄISCHE NORM
ICS 91.140.65 Supersedes EN 13203-5:2018
English Version
Gas-fired domestic appliances producing hot water - Part
5: Assessment of energy consumption of gas-fired
appliances combined with electrical heat pump

Appareils domestiques produisant de l'eau chaude Gasbefeuerte Geräte zur Warmwasserbereitung für

sanitaire utilisant les combustibles gazeux - Partie 5 : den Hausgebrauch - Teil 5: Bewertung des

Évaluation de la consommation énergétique des Energieverbrauchs von gasbefeuerten Geräten in

appareils utilisant les combustibles gazeux combinés à Kombination mit elektrischer Wärmepumpe

une pompe à chaleur électrique
This European Standard was approved by CEN on 13 June 2022.

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

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13203-5:2022 E

worldwide for CEN national Members.
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SIST EN 13203-5:2022
EN 13203-5:2022 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 5

1 Scope .................................................................................................................................................................... 6

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

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

4 General test conditions ................................................................................................................................. 7

4.1 Reference conditions ..................................................................................................................................... 7

4.2 Measurement uncertainties ........................................................................................................................ 9

4.2.1 General ................................................................................................................................................................ 9

4.2.2 Steady-state conditions ................................................................................................................................. 9

4.3 Test conditions ................................................................................................................................................. 9

4.3.1 General ................................................................................................................................................................ 9

4.3.2 Test room ........................................................................................................................................................ 10

4.3.3 Water supply .................................................................................................................................................. 10

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 ........................................................................................................................................... 11

5 Determination of the energy consumption of the appliance ........................................................ 11

5.1 General ............................................................................................................................................................. 11

5.1.1 Filling of the storage.................................................................................................................................... 12

5.1.2 Stabilization at cold ..................................................................................................................................... 13

5.1.3 Heating up time [M1] .................................................................................................................................. 13

5.1.4 Standby gas and electrical power input [M2] .................................................................................... 14

5.1.5 Standby power input in primary energy ............................................................................................. 16

5.2 Load profiles (M3) ....................................................................................................................................... 16

5.3 Determination of the energy recovered by the useful water ....................................................... 16

5.4 Calculation of gas energy ........................................................................................................................... 16

5.5 Calculation of daily electrical energy consumption ........................................................................ 17

5.6 Measurement of energy consumption in standby mode ................................................................ 20

5.7 Determination of daily auxiliary electrical energy consumption in off mode ....................... 20

6 Determination of the ratio of wasted water to total water ........................................................... 20

7 Eco design Related Products Data .......................................................................................................... 20

7.1 Water heating energy efficiency ............................................................................................................. 20

7.2 Smart control factor (SCF) and smart ................................................................................................... 21

7.3 Annual fuel consumption (AFC) .............................................................................................................. 21

7.4 Annual electricity consumption (AEC) ................................................................................................. 21

Annex A (informative) Test conditions ................................................................................................................ 23

Annex B (informative) Examples of test rig and measurement devices ................................................... 24

Annex C (informative) Declaration of the Maximum Load Profile ............................................................. 25

Annex D (informative) Packages covered by the present European standard ..................................... 26

Annex E (informative) Additional performance data ...................................................................................... 30

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SIST EN 13203-5:2022
EN 13203-5:2022 (E)

E.1 Coefficient of primary energy performance or primary energy yield (PER) .......................... 30

E.2 Total consumption of primary energy .................................................................................................. 30

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 ........................................................................................................................ 31

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 ................................................................................................. 32

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 ........................................................................................................................ 34

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 ................................................................................................. 35

Bibliography ................................................................................................................................................................. 37

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SIST EN 13203-5:2022
EN 13203-5:2022 (E)
European foreword

This document (EN 13203-5:2022) 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 February 2023, and conflicting national standards shall be withdrawn

at the latest by February 2023.

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 13203-5:2018.
The main technical changes compared to EN 13203-5:2018 are the following:

— 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;
— incorporation of ECOTESTS results.

This document has been prepared under a Standardization Request given to CEN by the European

Commission and the European Free Trade Association, and supports essential requirements of EU

Directive(s) / Regulation(s).

For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, ZB, ZC or ZD, which is an

integral part of this document.

The safety operation of the boiler is not covered by this document. Safety is proved by means of the essential

safety requirements of the Gas Appliances Regulation n°426/2016/UE. This way be achieved by compliance

with the appropriate existing harmonized standards.

Any feedback and questions on this document should be directed to the users’ national standards body. A

complete listing of these bodies can be found on the CEN website.

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.

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SIST EN 13203-5:2022
EN 13203-5:2022 (E)
Introduction

This document refers to clauses of EN 13203-2:2022 or adapts clauses by stating in the corresponding clause,

on the principle:

— shall be according to EN 13203-2:2022, (clause number) with the following modification;

— shall be according to EN 13203-2:2022, (clause number) with the following addition;

— EN 13203-2:2022, (clause number) is replaced by the following;
— EN 13203-2:2022, (clause number) is not applicable.

NOTE Useful standards are EN 26, EN 89, EN 15502-1, EN 15502-2-1 and EN 15502-2-2.

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SIST EN 13203-5:2022
EN 13203-5:2022 (E)
1 Scope

This document is applicable to gas-fired appliances producing domestic hot water. It applies to both

instantaneous and storage gas-fired combined with electric heat pump.

It applies to a package marketed as single unit or fully specified by the manufacturer that have:

— a heat input not exceeding 400 kW;
— a hot water storage tank capacity (if any) not exceeding 2 000 l.

EN 13203-1:2015 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 gas fired appliances combined

with heat pump with electrically driven compressor according to EN 16147. It specifies 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.

The present document does not apply for gas boilers with recovery systems using combustion products as

heat source for the electrical heat pump.

When the electrical heat pump does not work for domestic hot water production in the summer period, the

present standard is not applicable for energy performances assessing, instead EN 13203-2:2022 is applicable.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes

requirements of this document. For dated references, only the edition cited applies. For undated references,

the latest edition of the referenced document (including any amendments) applies.

Shall be according to EN 13203-2:2022, Clause 2, with the following additions:

EN 13203-2:2022, Gas-fired domestic appliances producing hot water — Part 2: Assessment of energy

consumption

EN 14511-3:2018, Air conditioners, liquid chilling packages and heat pumps for space heating and cooling and

process chillers, with electrically driven compressors — Part 3: Test methods
3 Terms and definitions
Shall be according to EN 13203-2:2022, Clause 3, with the following additions: “
3.1
indoor air

heat source for a heat pump which absorbs heat by a heat exchanger in direct contact with the air inside a

building
3.2
brine
heat transfer medium which has a freezing point depressed relative to water
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SIST EN 13203-5:2022
EN 13203-5:2022 (E)
3.3
gas-fired appliance combined with electric heat pump air/water

appliance which is either placed on the market or specified as a complete package to deliver domestic hot

water or domestic hot water and heating, comprising as relevant:
— electric heat pump;
— gas-fired appliance;
— ducts if appropriate;
— thermal store
3.4
exhaust air
air from the air-conditioned space entering the outdoor heat exchanger
[EN 14511-1:2018, 3.22]
3.5
external static pressure difference (Δp )

positive pressure difference measured between the air (or water) outlet section and the air (or water) inlet

section of the unit, which is available for overcoming the pressure drop of any additional ducted air (or water)

circuit
3.6
internal static pressure difference (Δp )

negative pressure difference measured between the air (or water) outlet section and the air (or water) inlet

section of the unit, which corresponds to the total pressure drop of all components on the air (or water) side

of the unit”.
4 General test conditions
4.1 Reference conditions
Shall be according to EN 13203-2:2022, 4.1, with the following additions:

“The tests shall be carried out at the test conditions specified in Table 1 as appropriate.

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SIST EN 13203-5:2022
EN 13203-5:2022 (E)
Table 1 — Test conditions for particular types of systems
Type of heat source Heat source Heat source inlet Range of ambient Ambient
Air Dry (Wet) a temperature of temperature of
/ outlet or bath
bulb heat pump (°C) storage tank (°C)
temperature (°C)
temperature
(°C)
Outdoor air heat pump from 15 to 30 20
(placed indoor side)
Average
7 (6)
Colder
2 (1)
Warmer
14 (13)
Outdoor air heat pump Heat source 20
(outdoor side) temperature
Average
7 (6)
Colder
2 (1)
Warmer
14 (13)
Non heated space air 15 (12) Heat source 15
temperature
Indoor air 20 (15) Heat source 20
temperature
Exhaust air 20 (12) from 15 to 30 20
Water 10 / 7 from 15 to 30 20
Brine 0 / −3 from 15 to 30 20
Direct evaporation a from 15 to 30 20

Brine bath mean temperature for direct evaporation testing case, the ambient temperature.

In addition, the permissible variations allowed for the test conditions when the heat pump is running shall not

exceed the values specified in Table 2.
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SIST EN 13203-5:2022
EN 13203-5:2022 (E)

Table 2 — Variations allowed for the test conditions when the heat pump is running

Variations of arithmetical mean values Variations of individual readings from
from specified test conditions specified test conditions
Readings
a b c Interval H b c
Interval H Interval D Interval S Interval D Interval S
Air temperature
d ±0,6 K ±1,5 K ±1,0 K ±5,0 K ±2,5 K
dry bulb
wet bulb ±0,4 K ±1,0 K ±0,6 K -
Volume flow ±5 % ±10 %
Static pressure
- ±10 %
difference
ambient
temperature of
the tank (if not ±1,0 K ±2,0 K
used as heat
source)

Interval H applies when the heat pump is operating, except for the first 10 min after termination of a defrost cycle, and

the first 10 min after a restart of the heat pump

Interval D applies during a defrost cycle and during the first 10 min after the termination of a defrost cycle when the

heat pump is operating in the heating mode

Interval S applies when the compressor is stopped and during the first 10 min after the hot water thermostat has

started again the heat pump

For units with outdoor heat exchanger surfaces greater than 5 m2, the deviation on the air inlet dry bulb temperature

is doubled
4.2 Measurement uncertainties
4.2.1 General
Shall be according to EN 13203-2:2022, 4.2.1.
4.2.2 Steady-state conditions
Shall be according to EN 13203-2:2022, 4.2.2.
4.3 Test conditions
4.3.1 General
Shall be according to EN 13203-2:2022, 4.3.1,
except the second sentence modified as follows:

“For gas fired appliances combined with electric heat pump (package), the tests shall be …”.

and the following sentence added:

“If liquid heat transfer media other than water are used, the specific heat capacity and density of such heat

transfer media shall be determined and taken into consideration in the evaluation.”.

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SIST EN 13203-5:2022
EN 13203-5:2022 (E)
4.3.2 Test room
EN 13203-2:2022, 4.3.2, is replaced with the following:

“The package shall be installed in a well-ventilated, draught-free room (air speed less than 0,5 m/s).

The package shall be protected from direct solar radiation and radiation from heat generators.

If the package incorporates an air source outdoor heat exchanger a further test room is needed. The size of

this test room shall be designed to avoid any resistance to air flow at the air inlet and air outlet orifices of the

test object. The air flow through this room shall not cause any short circuit between the two orifices, and

therefore the velocity of air flow at these two locations shall not exceed 1,5 m/s when the test object is

switched off. The air velocity in the room shall also not be greater than the mean velocity through the unit

inlet.

Unless otherwise stated in the technical documentation, the air inlet and air outlet orifices shall not be less

than 1m from the surfaces of the test room; this also applies to any measuring ducts.

The setting of the external static pressure difference on the air side for heat pumps with duct connection is

described by 4.4.1.4 of EN 14511-3:2018.

For heat pumps separated from the tank, the liquid flow rate has to be set on the liquid outlet side of the heat

pump to the nominal flow rate specified in the technical documentation.

The package shall be installed and connected for the test as specified in the installation instructions.

Temperature and pressure measuring points shall be situated in order to obtain significant mean values.

Set points for internal control equipment of the unit such as thermostats, pressure switches or mixing valves

shall be set to the values stated in the technical documentation.

Air and entrained gases shall be removed from all water and other heat transfer liquid systems.

In the case of package incorporating a single split heat pump, the following installation conditions shall be

complied with for the tests:

a) each refrigerant pipe shall be installed in accordance with the installation instructions;

b) the connecting pipes shall be installed so that the difference in elevation does not exceed 2,5 m. The

length of each connecting pipe shall be between 5 m and 7,5 m;

c) thermal insulation shall be applied to the pipes in accordance with the installation instructions;

d) unless constrained by the design at least half of the interconnecting pipes shall be exposed to the outdoor

conditions with the rest of the pipes exposed to the indoor conditions.

For indirect systems each water pipe shall be installed in accordance with the installation instructions to the

maximum stated length or 5 m whichever is shorter. Thermal insulation shall be applied to the pipes in

accordance with the installation instructions.”.
4.3.3 Water supply
Shall be according to EN 13203-2:2022, 4.3.3.
4.3.4 Initial adjustment of the appliance
Shall be according to EN 13203-2:2022, 4.3.4.
4.3.5 Conditions for the determination of the maximum load profile
Shall be according to EN 13203-2:2022, 4.3.5.
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SIST EN 13203-5:2022
EN 13203-5:2022 (E)
4.3.6 Electrical supply
Shall be according to EN 13203-2:2022, 4.3.6.
5 Determination of the energy consumption of the appliance
5.1 General
EN 13203-2:2022, 5.1, is replaced by the new clause as follows:
“5.1 Basic principles for the measurements of the performance

This clause specifies the test methods to apply for the determination of the energy consumption of the

covered appliances which consists of the following two preparation tests and the four measurement tests.

— [P1] Filling and storage volume (see 5.1.1);
— [P2] Stabilization at cold conditions (see 5.1.2);
— [M1] Heating up (see 5.1.3);

— [M2] Standby mode for electrical power input and gas input measurements (see 5.1.4);

— [M3] Tapping cycle application with all water draw-offs according to EN 13203-2:2022, 5.2;

— [M4] Mixed water at 40 °C and reference hot water temperature (see “existing 7.7” OR “new 7.8”).

The measurement steps 1 to 4 are performed according to in Figure 1.

Each individual test can be performed independently provided that its starting conditions are the same as the

ending conditions of the tests just before.
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SIST EN 13203-5:2022
EN 13203-5:2022 (E)
Key
M1: heating up time
M2: standby power (electrical and gas)
M3: water draw-offs (tapping)
M4: mixed water at 40 °C and reference hot water temperature
T : temperature
t : time
a : set point temperature
Figure 1 — Measurements [M1] to [M4]
5.1.1 Filling of the storage

The empty storage tank of the appliance is weighted including the inlet and outlet taps or connections.

Then it is filled with water as stated in the installation and operation instructions at the pressure of the

incoming cold water. When it is filled, the water supply is cut off and the appliance is weighed, including the

taps or connections.

The difference between the two weights (m ) shall be converted into volume, in litres, according to the

act
following formula:
act
(1)
V 100×
ρ T
( )
where
V is the rated volume of the hot water storage tank, in l;
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SIST EN 13203-5:2022
EN 13203-5:2022 (E)
m is the difference of the two weights, in kg;
act
ρ(T) 3
is the specific volume of cold water, in kg/m ;
T is the temperature of the water used to fill the tank, in °C.
This volume is to be reported in litres to the nearest one-tenth litres.
Filling of the storage are not applicable to heat pump combination heaters.

NOTE The temperature (T) reached after stabilization (see 5.1.2) can be used to calculate the specific volume ρ(T).

5.1.2 Stabilization at cold

The appliance is kept at ambient conditions until all its parts have reached ambient conditions ± 1 K.

NOTE A waiting time of 24 h is enough to reach stabilization.
5.1.3 Heating up time [M1]

The test consists of determining the heating up time (t ) necessary to heat the stored water from its initial

cold state temperature until the first time the gas boiler or the electric heat pump is turned off by the set

thermostat of the storage tank. The gas and/or electrical consumption are also measured.

Before launching the test, the cold water is circulated in the tank until the outlet temperature becomes equal

to the inlet temperature within the allowed variation specified (±0,5 K).

When this initial state temperature of the cold water is reached, the appliance is switched on.

After this initial start of the appliance the gas and electrical supplies are left on for the duration of the test.

The heating up time (t ) and the corresponding gas input (Q ) and/or electrical (W )consumptions

eh gas,eh eh

shall be measured from the moment the appliance is switched on until it is shut off by the thermostat of the

storage tank.
The gas consumption is calculated according to the following formula:
(2)
Q V× K× NCV
gas,eh g
where
Q is the gas energy consumption to heating up the tank, in kWh;
gas eh
V 3
g is the measured gas consumption during the heating up period, in m ;
NCV 3
is the net calorific value (at 15 °C and 1 013,25 mbar), in kWh/m ;

K is the correction constant and is calculated according to the following formula:

p + p - p
a g s 288,15
K = ⋅ (3)
1013, 25 T + 273,15
5262
Ps exp 21,094− (4)
273,15+ T
with
p is the atmospheric pressure, in mbar;
---------------------- Page: 15 ----------------------
SIST EN 13203-5:2022
EN 13203-5:2022 (E)
p is the gas pressure, in mbar;

p is the saturated vapour pressure of water at T (mbar); if a dry meter is used for the

s g
measurement of the volume, the value of (p ) is equal to zero;
T is the gas temperature, in °C.

The total electrical energy consumption is calculated according to following formula:

W W − W (5)
eh eh−−M EL Corr
where

W is the total electrical energy consumption during the heating up duration (t ), in kWh;

eh eh
W is the measured electrical energy consump
...

SLOVENSKI STANDARD
oSIST prEN 13203-5:2021
01-februar-2021
Plinske gospodinjske naprave za pripravo tople sanitarne vode - 5. del:
Ocenjevanje rabe energije plinskih aparatov, kombiniranih z električno toplotno
črpalko
Gas-fired domestic appliances producing hot water - Part 5: Assessment of energy
consumption of gas-fired appliances combined with electrical heat pump

Gasbeheizte Geräte für die sanitäre Warmwasserbereitung für den Hausgebrauch - Teil

5: Bewertung des Energieverbrauchs von Gasgeräten mit elektrischer Wärmepumpe

Appareils domestiques produisant de leau chaude sanitaire utilisant les combustibles

gazeux - Partie 5 : Évaluation de la consommation énergétique des appareils utilisant les

combustibles gazeux combinés à une pompe à chaleur électrique
Ta slovenski standard je istoveten z: prEN 13203-5
ICS:
27.080 Toplotne črpalke Heat pumps
91.140.65 Oprema za ogrevanje vode Water heating equipment
oSIST prEN 13203-5:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 13203-5:2021
---------------------- Page: 2 ----------------------
oSIST prEN 13203-5:2021
DRAFT
EUROPEAN STANDARD
prEN 13203-5
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2021
ICS 91.140.65 Will supersede EN 13203-5:2018
English Version
Gas-fired domestic appliances producing hot water - Part
5: Assessment of energy consumption of gas-fired
appliances combined with electrical heat pump

Appareils domestiques produisant de l¿eau chaude Gasbeheizte Geräte für die sanitäre

sanitaire utilisant les combustibles gazeux - Partie 5 : Warmwasserbereitung für den Hausgebrauch - Teil 5:

Évaluation de la consommation énergétique des Bewertung des Energieverbrauchs von Gasgeräten mit

appareils utilisant les combustibles gazeux combinés à elektrischer Wärmepumpe
une pompe à chaleur électrique

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 109.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13203-5:2021 E

worldwide for CEN national Members.
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oSIST prEN 13203-5:2021
prEN 13203-5:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 5

1 Scope .................................................................................................................................................................... 6

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

3 Terms and definitions ................................................................................................................................... 7

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 ................................................................................................................................. 8

4.3 Test conditions ................................................................................................................................................. 8

4.3.1 General ................................................................................................................................................................ 8

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 ........................................................ 10

5.1 General ............................................................................................................................................................. 10

5.1.1 Filling of the storage.................................................................................................................................... 11

5.1.2 Stabilization at cold ..................................................................................................................................... 12

5.1.3 Heating up time [M1] .................................................................................................................................. 12

5.1.4 Standby gas and electrical power input [M2] .................................................................................... 13

5.1.5 Standby power input in primary energy ............................................................................................. 15

5.2 Load profiles (M3) ....................................................................................................................................... 15

5.3 Determination of the energy recovered by the useful water ....................................................... 15

5.4 Calculation of gas energy ........................................................................................................................... 15

5.5 Calculation of daily electrical energy consumption ........................................................................ 15

5.6 Measurement of energy consumption in standby mode ................................................................ 17

5.7 Determination of daily auxiliary electrical energy consumption in off mode ....................... 17

6 Determination of the ratio of wasted water to total water ........................................................... 18

7 Eco design Related Products Data .......................................................................................................... 18

7.1 Water heating energy efficiency ............................................................................................................. 18

7.2 Smart control factor (SCF) and smart ................................................................................................... 18

7.3 Annual fuel consumption (AFC) .............................................................................................................. 18

7.4 Annual electricity consumption (AEC) ................................................................................................. 18

7.5 Mixed water at 40°C (V40) for storage water heaters .................................................................... 18

Annex A (informative) Test conditions ............................................................................................................ 20

Annex B (informative) Examples of test rig and measurement devices ................................................ 21

Annex C (informative) Declaration of the Maximum Load Profile .......................................................... 22

Annex D (informative) Packages covered by the present European standard .................................. 23

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oSIST prEN 13203-5:2021
prEN 13203-5:2021 (E)

Annex E (informative) Additional performance data ................................................................................... 28

E.1 Coefficient of primary energy performance or primary energy yield (PER) .......................... 28

E.2 Total consumption of primary energy .................................................................................................. 28

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 ........................................................................................................................ 29

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 ................................................................................................. 30

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 ........................................................................................................................ 31

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 ................................................................................................. 32

Bibliography ................................................................................................................................................................. 33

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oSIST prEN 13203-5:2021
prEN 13203-5:2021 (E)
European foreword

This document (prEN 13203-5:2021) has been prepared by Technical Committee CEN/TC 109 “Central

heating boilers using gaseous fuels”, the secretariat of which is held by NEN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 13203-5:2018.

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 Annex ZA, ZB, ZC or ZD, which are integral parts of this

document.

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.

The safety operation of the boiler is not covered by this standard. Safety is proved by means of the essential

safety requirements of the Gas Appliances Regulation n°426/2016/UE. This way 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.

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oSIST prEN 13203-5:2021
prEN 13203-5:2021 (E)
Introduction

This document refers to clauses of prEN 13203-2:2020 or adapts clauses by stating in the corresponding

clause, on the principle:

— shall be according to prEN 13203-2:2020, (clause number) with the following modification;

— shall be according to prEN 13203-2:2020, (clause number) with the following addition;

— prEN 13203-2:2020, (clause number) is replaced by the following;
— prEN 13203-2:2020, (clause number) is not applicable.
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oSIST prEN 13203-5:2021
prEN 13203-5:2021 (E)
1 Scope

This document is applicable to gas-fired appliances producing domestic hot water. It applies to both

instantaneous and storage gas-fired combined with electric heat pump.

It applies to a package marketed as single unit or fully specified by the manufacturer that have:

— a heat input not exceeding 400 kW; and
— a hot water storage tank capacity (if any) not exceeding 2000 l.

EN 13203-1:2015 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 gas fired appliances combined

with heat pump with electrically driven compressor according to EN 16147. 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.

The present document does not apply for gas boilers with recovery systems using combustion products as

heat source for the electrical heat pump.

When the electrical heat pump does not work for domestic hot water production in the summer period, the

present standard is not applicable for energy performances assessing, prEN 13203-2:2020 is used.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes

requirements of this document. For dated references, only the edition cited applies. For undated references,

the latest edition of the referenced document (including any amendments) applies.

prEN 13203-2:2020, Gas-fired domestic appliances producing hot water - Part 2: Assessment of energy

consumption

EN 14511-1:2018, Air conditioners, liquid chilling packages and heat pumps for space heating and cooling and

process chillers, with electrically driven compressors - Part 1: Terms and definitions

EN 14511-2:2018, Air conditioners, liquid chilling packages and heat pumps for space heating and cooling and

process chillers, with electrically driven compressors - Part 2: Test conditions

EN 14511-3:2018, Air conditioners, liquid chilling packages and heat pumps for space heating and cooling and

process chillers, with electrically driven compressors - Part 3: Test methods

EN 14511-4:2018, Air conditioners, liquid chilling packages and heat pumps for space heating and cooling and

process chillers, with electrically driven compressors - Part 4: Requirements
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oSIST prEN 13203-5:2021
prEN 13203-5:2021 (E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in prEN 13203-2:2020 and the following

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
3.19
indoor air

heat source for a heat pump which absorbs heat by a heat exchanger in direct contact with the air inside a

building
3.20
brine
heat transfer medium which has a freezing point depressed relative to water
3.21
gas-fired appliance combined with electric heat pump air/water

appliance which is either placed on the market or specified as a complete package to deliver domestic hot

water or domestic hot water and heating, comprising as relevant:
— electric heat pump;
— gas-fired appliance;
— ducts if appropriate;
— thermal store.
3.22
exhaust air
air from the air conditioned space entering the outdoor heat exchanger
[SOURCE EN 14511-1:2018, 3.22]
3.23
external static pressure difference (Δp )
ext

positive pressure difference measured between the air (or water) outlet section and the air (or water) inlet

section of the unit, which is available for overcoming the pressure drop of any additional ducted air (or water)

circuit
3.24
internal static pressure difference (Δp )
int

negative pressure difference measured between the air (or water) outlet section and the air (or water) inlet

section of the unit, which corresponds to the total pressure drop of all components on the air (or water) side

of the unit
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oSIST prEN 13203-5:2021
prEN 13203-5:2021 (E)
4 General test conditions
4.1 Reference conditions
Shall be according to prEN 13203-2:2020, 4.1, with the following additions:

"The tests shall be carried out at the test conditions specified in Table 1 as appropriate.

Table 1 — Test conditions for particular types of systems
Type of heat source Heat source Range of ambient Ambient temperature
temperature (°C) temperature for heat of storage tank (°C)
pump
(°C)
Outside air (heat pump
7 ± 0,2 20 ± 3 20 ± 3
indoor) with air duct
(6 ± 0,3)
Outside air (heat pump
7 ± 0,2 20 ± 3
7 ± 3
outdoor)
(6 ± 0,3)
a) a)
Exhaust air 20 ± 0,2
20 ± 3 20 ± 3
(12 ± 0,3)
Water (inlet) 10 ± 0,15 20 ± 3 20 ± 3
Brine (inlet) 0 ± 0,15 20 ± 3 20 ± 3
Direct evaporation 4 ± 0,5 20 ± 3 20 ± 3

In this case, the ambient temperature of the heat pump is the same as the temperature of the heat source. The

difference with EN 16147 is justified because of the possible installation of the appliance into a living room.

NOTE 1 All heat source temperatures are inlet temperatures in °C.
NOTE 2 All air temperatures in (brackets) are wet bulb temperatures in °C.

NOTE 3 Permissible external pressure difference or associated internal pressure difference at the outdoor heat

exchanger as stated in the installation and/or operation manual in Pascal (Pa) for appliances with duct

connection.
4.2 Measurement uncertainties
4.2.1 General
Shall be according to prEN 13203-2:2020, 4.2.1.
4.2.2 Steady-state conditions
Shall be according to prEN 13203-2:2020, 4.2.2.
4.3 Test conditions
4.3.1 General
Shall be according to prEN 13203-2:2020, 4.3.1,
except the second sentence modified as follows:
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oSIST prEN 13203-5:2021
prEN 13203-5:2021 (E)

"For gas fired appliances combined with electric heat pump (package), the tests shall be …".

and the following sentence added:

"If liquid heat transfer media other than water are used, the specific heat capacity and density of such heat

transfer media shall be determined and taken into consideration in the evaluation."

4.3.2 Test room
prEN 13203-2:2020, 4.3.2, is replaced by the following:

"The package shall be installed in a well-ventilated, draught-free room (air speed less than 0,5 m/s).

The package shall be protected from direct solar radiation and radiation from heat generators.

If the package incorporates an air source outdoor heat exchanger a further test room is needed. The size of

this test room shall be designed to avoid any resistance to air flow at the air inlet and air outlet orifices of the

test object. The air flow through this room shall not cause any short circuit between the two orifices, and

therefore the velocity of air flow at these two locations shall not exceed 1,5 m/s when the test object is

switched off. The air velocity in the room shall also not be greater than the mean velocity through the unit

inlet.

Unless otherwise stated in the technical documentation, the air inlet and air outlet orifices shall not be less

than 1m from the surfaces of the test room; this also applies to any measuring ducts.

The setting of the external static pressure difference on the air side for heat pumps with duct connection is

described by 4.4.1.4 of EN 14511-3:2018.

For heat pumps separated from the tank, the liquid flow rate has to be set on the liquid outlet side of the heat

pump to the nominal flow rate specified in the technical documentation.

The package shall be installed and connected for the test as specified in the installation instructions.

Temperature and pressure measuring points shall be situated in order to obtain significant mean values.

Set points for internal control equipment of the unit such as thermostats, pressure switches or mixing valves

shall be set to the values stated in the technical documentation.

Air and entrained gases shall be removed from all water and other heat transfer liquid systems

In the case of package incorporating a single split heat pump, the following installation conditions shall be

complied with for the tests:

a) each refrigerant pipe shall be installed in accordance with the installation instructions;

b) the connecting pipes shall be installed so that the difference in elevation does not exceed 2,5 m. The

length of each connecting pipe shall be between 5 m and 7,5 m;

c) thermal insulation shall be applied to the pipes in accordance with the installation instructions;

d) unless constrained by the design at least half of the interconnecting pipes shall be exposed to the outdoor

conditions with the rest of the pipes exposed to the indoor conditions.

For indirect systems each water pipe shall be installed in accordance with the installation instructions to the

maximum stated length or 5 m whichever is shorter. Thermal insulation shall be applied to the pipes in

accordance with the installation instructions."
4.3.3 Water supply
Shall be according to prEN 13203-2:2020, 4.3.3.
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oSIST prEN 13203-5:2021
prEN 13203-5:2021 (E)
4.3.4 Initial adjustment of the appliance
Shall be according to prEN 13203-2:2020, 4.3.4.
4.3.5 Conditions for the determination of the maximum load profile
Shall be according to prEN 13203-2:2020, 4.3.5.
4.3.6 Electrical supply
Shall be according to prEN 13203-2:2020, 4.3.6.
5 Determination of the energy consumption of the appliance
5.1 General
prEN 13203-2:2020, 5.1, is replaced by the new clause as follows:
"5.1 Basic principles for the measurements of the performance

This clause defines the test methods to apply for the determination of the energy consumption of the covered

appliances which consists of the following two preparation tests and the four measurement tests.

— [P1] Filling and storage volume (see 5.1.1);
— [P2] Stabilization at cold conditions (see 5.1.2);
— [M1] Heating up (see 5.1.3);

— [M2] Standby mode for electrical power input and gas input measurements (see 5.1.4);

— [M3] Tapping cycle application with all water draw-offs according to prEN 13203-2:2020, 5.2;

— [M4] Mixed water at 40 °C and reference hot water temperature (see "existing 7.7" OR "new 7.8").

The measurement steps 1 to 4 are performed according to in Figure 1.

Each individual test can be performed independently provided that its starting conditions are the same as the

ending conditions of the tests just before.
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oSIST prEN 13203-5:2021
prEN 13203-5:2021 (E)
Key
M1 Heating up time
M2 Standby power (electrical and gas)
M3 Water draw-offs (tapping)
M4 Mixed water at 40 °C and reference hot water temperature
T temperature
t time
a set point temperature
Figure 1 — Measurements [M1] to [M4]
5.1.1 Filling of the storage

The empty storage tank of the appliance is weighted including the inlet and outlet taps or connections.

Then it is filled with water as stated in the installation and operation instructions at the pressure of the

incoming cold water. When it is filled, the water supply is cut off and the appliance is weighed, including the

taps or connections.

The difference between the two weights (mact) shall be converted into volume, in litres, according to the

following formula:
act
Vm= 100 (1)
ρ T
( )
where
Vm is the rated volume of the hot water storage tank, in l;
mact is the difference of the two weights, in kg;
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oSIST prEN 13203-5:2021
prEN 13203-5:2021 (E)
ρ(T) is the specific volume of cold water, in kg/m ;
T is the temperature of the water used to fill the tank, in °C.
This volume is to be reported in litres to the nearest one-tenth litres.
Filling of the storage are not applicable to heat pump combination heaters.

NOTE The temperature (T) reached after stabilisation (see 5.1.2) can be used to calculate the specific volume ρ(T).

5.1.2 Stabilization at cold

The appliance is kept at ambient conditions until all its parts have reached ambient conditions ± 1 K.

NOTE A waiting time of 24 h is enough to reach stabilisation.
5.1.3 Heating up time [M1]

The test consists of determining the heating up time (teh) necessary to heat the stored water from its initial

cold state temperature until the first time the gas boiler or the electric heat pump is turned off by the set

thermostat of the storage tank. The gas and/or electrical consumption are also measured.

Before launching the test, the cold water is circulated in the tank until the outlet temperature becomes equal

to the inlet temperature within the allowed variation specified (± 0,5 K).

When this initial state temperature of the cold water is reached, the appliance is switched on.

After this initial start of the appliance the gas and electrical supplies are left on for the duration of the test.

The heating up time (teh) and the corresponding gas (Qgas) and/or electrical (Weh-HP)consumptions shall be

measured from the moment the appliance is switched on until it is shut off by the thermostat of the storage

tank.
The gas consumption is calculated according to the following formula:
Q =K⋅ NCV⋅ V (2)
gas,eh g
where
Q is the gas energy consumption to heating up the tank, in kWh;
gas eh
V is the measured gas consumption during the heating up period, in m ;
NCV is the net calorific value (at 15 °C and 1013,25 mbar), in kWh/m ;

K is the correction constant and is calculated according to the following formula:

  
pp+ − p
ag s 288,15
  
K= (3)
 1013,,25  T + 273 15
  
5262
(4)
P exp 21,094−
273,15+ T
with
p is the atmospheric pressure, in mbar;
p is the gas pressure, in mbar;

p is the saturated vapour pressure of water at tg (mbar); If a dry meter is used for

the measurement of the volume, the value of (ps) is equal to zero;
T is the gas temperature, in °C.
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oSIST prEN 13203-5:2021
prEN 13203-5:2021 (E)

The total electrical energy consumption is calculated according to following formula:

W W− W (5)
eh-HP eh-M EL-Corr
where

Weh-HP is the total electrical energy consumption during the heating up duration (teh), in kWh;

Weh-M is the measured electrical energy consumption during the heating up duration, in kWh;

WEL-Corr is the correction due to electrical energy consumption of fan if the electric heat pump operates

during the heating up period, in kWh.
WEL-Corr is calculated according to the following formula:
V tp∆
t ( )
eh air
W = dt (6)
EL-Corr
3600⋅ 1000 η
Where
Ƞ is the efficiency of the fan;
Vair (t) is the nominal air flowrate, in m /s;
Δp is the measured external or internal static pressure difference, in Pa;
t is the heat up duration, in s.

If the electric heat pump did not operate during the heat up period the measured value is not corrected and is

determined by the following formula:
WW= (7)
eh-HP eh-M
5.1.4 Standby gas and electrical power input [M2]

This test can be launched just after the appliance shut off caused by the thermostat following the heating up

period.

The standby gas and/or electrical consumptions are measured over several on-off cycles of the appliance

initiated by the thermostat of the storage tank without any water draw-off.
This test shall be performed over a period not less than 48 h excep
...

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