prEN 13203-6

Gas-fired domestic appliances producing hot water - Part 6: Assessment of energy consumption of adsorption and absorption heat pumps

Sorption heat pumps connected to or including a domestic hot water storage tank. It applies to a package marketed as single unit or fully specified 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.
Horizontal ground heat sources are not covered by the scope of the present European Standard.

Gasgeräte für die häusliche Warmwasserbereitung - Teil 6: Bewertung des Energieverbrauchs von gasbeheizten Adsorption- und Absorptionswärmepumpen

Dieses Dokument ist auf gasbeheizte Geräte für die sanitäre Warmwasserbereitung anwendbar. Es gilt für Sorptionswärmepumpen, die mit einem sanitären Warmwasserspeicher verbunden sind oder einen solchen enthalten. Es gilt für Systeme, die als eine einzelne Einheit vertrieben werden oder vollständig festgelegt sind und die
— eine Wärmebelastung von höchstens 400 kW; und
— ein Warmwasser-Speichervolumen (sofern vorhanden) von höchstens 2 000 l haben.
Bei Kombikesseln mit oder ohne Speicher ist die sanitäre Warmwasserbereitung im Kessel eingebaut oder am Kessel angebaut, und das gesamte System wird als eine Einheit vertrieben.
EN 13203-1 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 energiebezogenen Leistung der Geräte fest. Es definiert eine Anzahl täglicher Lastprofile für jede sanitäre Warmwasserverwendung in der Küche, zum Duschen und Baden sowie für Kombinationen dieser Verwendungsarten und legt die entsprechenden Prüfverfahren fest, mit denen sich das Energieverhalten unterschiedlicher gasbeheizter Geräte vergleichen und auf die Bedürfnisse des Nutzers ausrichten lässt. Werden andere Technologien mit einem gasbeheizten Kessel oder einem Warmwasserbereiter für die sanitäre Warmwasserbereitung kombiniert, so gelten die jeweils zutreffenden Teile der EN 13203.
Horizontal unter der Erdoberfläche verlegte Wärmequellen sind nicht Gegenstand des Anwendungsbereiches der vorliegenden Europäischen Norm.

Appareils domestiques produisant de l’eau chaude sanitaire utilisant les combustibles gazeux - Partie 6 : Évaluation de la consommation énergétique des pompes à chaleur à ad-sorption et ab-sorption

Le présent document s’applique aux appareils de production d’eau chaude sanitaire utilisant des combustibles gazeux. Il s’applique aux pompes à chaleur à sorption incluant ou raccordées à un ballon d’eau chaude sanitaire. Il s’applique également à un ensemble commercialisé comme une seule unité ou entièrement spécifié, 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.
Dans le cas des chaudières mixtes, avec ou sans ballon, la production d’eau chaude sanitaire est intégrée ou accolée, l’ensemble étant commercialisé comme une seule unité.
L’EN 13203-1 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. Il définit 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.
Les sources géothermiques horizontales n’appartiennent pas au domaine d’application de la présente Norme européenne.

Plinske gospodinjske naprave za pripravo tople sanitarne vode - 6. del: Ocenjevanje rabe energije adsorpcijskih in absorpcijskih toplotnih črpalk

General Information

• Status: Not Published
• ICS: 91.140.65 - Water heating equipment
• Technical Committee: CEN/TC 109 - Central heating boilers using gaseous fuels
• Drafting Committee: CEN/TC 109/WG 4 - Hot water production of central heating boilers for domestic use
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Due Date: 07-Dec-2021
• Completion Date: 07-Dec-2021
• Directive: 2016/426 - REGULATION (EU) 2016/426 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 9 March 2016 on appliances burning gaseous fuels and repealing Directive 2009/142/EC
• Directive: 80/779/EEC - Air quality limit values and guide values for sulphur dioxide and suspended particulates
• Directive: 811/2013 - Commission Delegated Regulation (EU) No 811/2013 of 18 February 2013 supplementing Directive 2010/30/EU of the European Parliament and of the Council with regard to the energy labelling of space heaters, combination heaters, packages of space heater, temperature control and solar device and packages of combination heater, temperature control and solar device
• Directive: 812/2013 - Commission Delegated Regulation (EU) No 812/2013 of 18 February 2013 supplementing Directive 2010/30/EU of the European Parliament and of the Council with regard to the energy labelling of water heaters, hot water storage tanks and packages of water heater and solar device
• Directive: 813/2013 - Commission Regulation (EU) No 813/2013 of 2 August 2013 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for space heaters and combination heaters
• Directive: 814/2013 - Commission Regulation (EU) No 814/2013 of 2 August 2013 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for water heaters and hot water storage tanks
• Mandate: M/534 - [C(2015)2625] Standardisation request to the European standardisation organisations pursuant to Article 10(1) of Regulation (EU) No 1025/2012 of the European Parliament and of the Council in support of implementation of Commission Regulation (EU) No 814/2013 of 2 August 2013 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for water heaters and hot water storage tanks and Commission Delegated Regulation (EU) No 812/2013 of 18 February 2013 supplementing Directive 2010/30/EU of the European Parliament and of the Council with regard to the energy labelling of water heaters, hot water storage tanks and packages of water heater and solar device
• Mandate: M/535 - [C(2016)2626) Standardisation request to the European standardisation organisations to draft harmonised European standards pursuant to Article 10(1) of Regulation (EU) No 1025/2012 of the European Parliament and of the Council in support of implementation of Commission Regulation (EU) No 813/2013 of 2 August 2013 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to eco-design requirements for space heaters and combination heaters and Commission Delegated Regulation (EU) No 811/2013 of 18 February 2013 supplementing Directive 2010/30/EU of the European Parliament and of the Council with regard to the energy labelling of space heaters, combination heaters, packages of space heaters, temperature control and solar device and packages of combination heater, temperature control and solar device
• Ref Project: oSIST prEN 13203-6:2021 - Gas-fired domestic appliances producing hot water - Part 6: Assessment of energy consumption of adsorption and absorption heat pumps

RELATIONS

• Revised: EN 13203-6:2018 - Gas-fired domestic appliances producing hot water - Part 6: Assessment of energy consumption of adsorption and absorption heat pumps
• Effective Date: 05-Aug-2020

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 13203-6:2021
01-februar-2021
Plinske gospodinjske naprave za pripravo tople sanitarne vode - 6. del:
Ocenjevanje rabe energije adsorpcijskih in absorpcijskih toplotnih črpalk
Gas-fired domestic appliances producing hot water - Part 6: Assessment of energy
consumption of adsorption and absorption heat pumps

Gasbeheizte Geräte für die sanitäre Warmwasserbereitung für den Hausgebrauch - Teil

6: Bewertung des Energieverbrauchs von gasbeheizten Sorptionswärmepumpen

Appareils domestiques produisant de leau chaude sanitaire utilisant les combustibles

gazeux - Partie 6 : Évaluation de la consommation énergétique des pompes à chaleur à

ad-sorption et ab-sorption
Ta slovenski standard je istoveten z: prEN 13203-6
ICS:
27.080 Toplotne črpalke Heat pumps
91.140.65 Oprema za ogrevanje vode Water heating equipment
oSIST prEN 13203-6:2021 en,fr,de

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

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oSIST prEN 13203-6:2021
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oSIST prEN 13203-6:2021
DRAFT
EUROPEAN STANDARD
prEN 13203-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2021
ICS 91.140.65 Will supersede EN 13203-6:2018
English Version
Gas-fired domestic appliances producing hot water - Part
6: Assessment of energy consumption of adsorption and
absorption heat pumps

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

sanitaire utilisant les combustibles gazeux - Partie 6 : Warmwasserbereitung für den Hausgebrauch - Teil 6:

Évaluation de la consommation énergétique des Bewertung des Energieverbrauchs von gasbeheizten

pompes à chaleur à ad-sorption et ab-sorption Sorptionswärmepumpen

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 13203-6:2021 E

worldwide for CEN national Members.
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oSIST prEN 13203-6:2021
prEN 13203-6:2021 (E)
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 ........................................................................................................................ 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 ........................................................................................................................................................... 9

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 ........................................................................................................................................... 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

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

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

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

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

5.4.2 Corrections to apply for fans and circulation water pumps ......................................................... 16

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

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 ........................................................... 17

7 Eco design Related Products Data .......................................................................................................... 17

7.1 Water heating energy efficiency ............................................................................................................. 17

7.2 Smart control factor (SCF) and smart ................................................................................................... 17

7.3 Annual fuel consumption (AFC) .............................................................................................................. 17

7.4 Annual electricity consumption (AEC) ................................................................................................. 17

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

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

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

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

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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 ........................................................................................................................ 23

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 ................................................................................................. 24

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 ........................................................................................................................ 26

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 ................................................................................................. 27

Bibliography ................................................................................................................................................................. 29

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oSIST prEN 13203-6:2021
prEN 13203-6:2021 (E)
European Foreword

This document (prEN 13203-6:2021) 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 13203-6:2018.

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, B, C or D, which is an integral part 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 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 series EN 15502 and series EN 12309.
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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 13203-6:2021
prEN 13203-6:2021 (E)
1 Scope

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

pumps connected to or including a domestic hot water storage tank. It applies to a package marketed as single

unit or fully specified 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.

Horizontal ground heat sources are not covered by the scope of the present European Standard.

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 with electrically driven

compressors for space heating and cooling - Part 1: Terms, definitions and classification

EN 14511-2:2018, Air conditioners, liquid chilling packages and heat pumps with electrically driven

compressors for space heating and cooling - Part 2: Test conditions

EN 14511-3:2018, Air conditioners, liquid chilling packages and heat pumps with electrically driven

compressors for space heating and cooling - Part 3: Test methods

EN 14511-4:2018, Air conditioners, liquid chilling packages and heat pumps with electrically driven

compressors for space heating and cooling - Part 4: Operating requirements, marking and instructions

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
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3.1
indoor ambient air

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

building without any dedicated duct
3.2
brine
heat transfer medium which has a freezing point depressed relative to water
3.3
sorption heat pump

encased assembly or assemblies designed as an appliance whose primary function is delivery of domestic hot

water or domestic hot water and heating, where the primary function is dependent on circulation of fluid

(refrigerant and/or solution) within the absorption, adsorption or refrigerant circuit(s)

3.4
gas-fired sorption heat pump combined with a gas-fired appliance

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

effectively domestic hot water and/or heating, comprising as relevant:
— gas-fired sorption heat pump;
— gas-fired appliance;
— ducts if appropriate;
— thermal store
3.5
ground heat source

heat source of a sorption heat pump for which a heat exchanger, vertically embedded into the ground, is used

to extract heat from the surrounding soil or rock by way of a brine circuit through the evaporator

3.6
solar collector source

heat source of a sorption heat pump for which a solar thermal collector is used to capture radiation energy

from the sun by way of a brine circuit through the evaporator
3.7
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
3.8
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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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 a)
of storage tank
pump
(°C)
(°C)
7 ± 0,2
20 ± 3 20 ± 3
Outside air (heat pump
(6 ± 0,3)
indoor) with air duct
7 ± 0,2
Outside air
7 ± 3 20 ± 3
(heat pump outdoor)
(6 ± 0,3)
20 ± 0,2
Exhaust air 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
Ground heat source
7 ± 0,2 20 ± 3
(Brine, inlet) 20 ± 3
Solar collector source
12 ± 0,2 20 ± 3 20 ± 3
(Brine, inlet)
In case of outside storage tank the temperature shall be 7 ± 0,2 °C.

Applies to vertical ground heat exchanger with extraction rates lower than 35 W/m, for which brine return

temperatures don't fall below 4°C after 25 years of operation (VDI 4046-2:2001).
c) 2 2

Applies to aperture area to heat extraction ratios of > 3 m /kW for flat plate collectors and > 2 m /kW for vacuum

tube collectors.
NOTE 1 All heat source temperatures are inlet temperatures in °C.
NOTE 2 All air temperatures in (brackets) are wet bulb temperatures in °C.
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4.2 Measurement uncertainties
4.2.1 General
Shall be according to prEN 13203-2:2020, 4.2.1, with the following additions:
— air as heat source dry bulb temperature: ± 0,2 K;
— air as heat source wet bulb temperature: ± 0,3 K;
— water/brine as heat source: ± 0,15 K;
— brine from ground or solar source: ± 0,2 K.
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:

"For gas fired appliances combined with gas heat pump, the tests shall be …".
and the following sentences added:

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

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

When the gas-fired sorption heat pump combined with a gas-fired appliance does not operate in heat pump

mode for domestic hot water production according to data in Table 1, the test shall be performed according to

EN 13203-2 instead.”
4.3.2 Test room
Shall be according to prEN 13203-2:2020, 4.3.2, with the following additions:

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

For sorption heat pumps separated from the storage 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 installation and/or operation manual.

The sorption heat pump and/or 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 installation and/or operation instructions.

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Air and entrained gases shall be removed from all water and other heat transfer liquid 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
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 5.1.2);
— [P2] Stabilization at cold conditions (see 5.1.3);
— [M1] Heating up (see 5.1.4);

— [M2] Standby mode for electrical power input and gas input measurements (see 5.1.5);

— [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 7.7).
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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Key
M1: Heating up time
M2: Standby power (electric 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=1000 (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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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-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 gas heat pump is switched on.

After this initial start of the gas heat pump, 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 gas heat pump-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:
QV = K.NCV. (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:

pa+−pg ps 288,15
K= (3)
1013,25 Tg+ 273,15

5262
Ps exp 21,094− (4)
273,15+ T
with
pa is the atmospheric pressure, in mbar;
p is the gas pressure, in mbar;
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oSIST prEN 13203-6:2021
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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.

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

(5)
W WW−
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 during the heating up period,

in kWh.
WEL-Corr is calculated according to the following formula:
 
V t ∆
air p
W = dt (6)
 
EL−Corr
 
3600.1000 η
0 f
 
Where
Ƞ is the efficiency of the fan according to EN 14511-3;
V (t) is the nominal air flowrate, in m /s;
air
Δp is the measured external or internal static pressure difference, in Pa;
t is the heat up duration, in s.

If the gas 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 gas heat pump 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-gas heat pump

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 except if six on-off cycles have occurred before

reaching 48 h

The time duration (tes), the gas (Qgas,es) and/or the electrical (Wes-HP) energy consumptions at standby are

the values measured at the last on-off cycle.
The gas consumption at standby is calculated according to the following formula:
QV = K.NCV. (8)
( )
gas,es g
where
Qgas,es is the gas energy consumption of the last on/off cycle, in kWh;
Vg is the measured gas consumption of the last on/off cycle, in m ;
NCV is the net calorific value (at 15 °C and 1013,25 mbar), in kWh/m ;
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