EN 13203-3:2022
(Main)Gas-fired domestic appliances producing hot water - Part 3: Assessment of energy consumption of solar supported gas-fired appliances
General Information
- Abstract
This document is applicable to solar supported gas-fired appliances producing domestic hot water. It applies to a system marketed as single unit or a fully specified system that:
- has a gas heat input not exceeding 70 kW;
- has a hot water storage tank capacity not exceeding 500 l;
- is equipped with at least one solar collector;
- is, with regard to the solar hydraulic circuit, considered as a forced circulation system (definition according to EN ISO 9488:1999).
The appliances covered by this document are described in Annex E (normative).
This document does not apply to thermo-siphon or integral collector storage tank systems according to definitions given by EN ISO 9488:1999.
NOTE In principle, the energy consumption of thermo-siphon solar preheat systems and integral collector storage tank preheat systems can also be assessed based on this document. One appropriate procedure for that purpose is to calculate the temperature level of the domestic hot water withdrawn from the thermal solar system for the reference conditions specified in this standard by using the numerical system model and the thermal solar system performance parameters according to ISO 9459-5. Based on the temperature level of the hot water withdrawn from the store the energy consumption of the gas appliance is determined. This determination can either be done by means of calculations or by performing a test according to EN 13203 2:2022 and using instead of the cold water inlet temperature the hot water temperature withdrawn from the store.
This document is not intended to assess the performance:
- of the solar collector(s), which should comply with EN 12975-1:2006+A1:2010 and EN 12975-2:2006;
- of thermal solar systems and components, which should comply with EN 12976-1:2021 and EN 12976-2:2019.
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 presenting the information to the user.
The present document sets out a method for assessing the energy performance of a solar supported appliance. It specifies a few daily tapping cycles for each domestic hot water use, kitchen, shower, bath and a combination of these, together with corresponding test procedures including information about the available solar radiation. It enables the energy performances of different gas-fired appliances to be compared and matched to the needs of the user.
- Status
- Published
- Publication Date
- 09-Aug-2022
- Technical Committee
- CEN/TC 109 - Central heating boilers using gaseous fuels
- Current Stage
- 6060 - Definitive text made available (DAV) - Publishing
- Start Date
- 10-Aug-2022
- Due Date
- 14-Oct-2022
- Completion Date
- 10-Aug-2022
- Directive
- Harmonized Standard2016/426 - 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
Overview
EN 13203-3:2022 - "Gas-fired domestic appliances producing hot water - Part 3" - defines a standardized method for assessing the energy consumption of solar supported gas-fired appliances used for domestic hot water. The standard applies to systems marketed as a single unit or fully specified system with:
- gas heat input ≤ 70 kW,
- hot water storage tank capacity ≤ 500 L,
- at least one solar collector, and
- a forced-circulation solar hydraulic circuit (per EN ISO 9488:1999).
EN 13203-3:2022 provides test procedures and calculation methods to compare and rate gas-fired appliances coupled with solar thermal support, enabling consistent evaluation of energy consumption for domestic hot water delivery.
Key topics and requirements
- Scope limits: Excludes thermo-siphon and integral collector storage tank systems (though the document notes procedures to assess these as an option).
- Test conditions & reference conditions: Specifies laboratory test setup, measurement uncertainties, and environmental reference conditions needed for repeatable results.
- Load profiles and solar cycle: Defines daily tapping cycles (kitchen, shower, bath, combined uses) and a representative solar cycle (typical mid‑European day) including available solar radiation data.
- Energy calculations:
- Determination of useful solar energy recovered by the system.
- Calculation of daily gas energy consumption for summer and winter modes and seasonally weighted values.
- Determination of daily electrical auxiliary consumption, standby and off-mode consumption.
- Solar collector simulator: Annex D describes a solar collector simulator option to emulate collector thermal input during tests.
- Eco‑design related outputs: Provides parameters for Water Heating Energy Efficiency, Smart Control Factor (SFC), Annual Fuel Consumption (AFC) and Annual Electricity Consumption (AEC).
- Normative annexes: Annex E lists appliances covered; other annexes cover test rig examples, measurement devices and reporting.
Practical applications and users
EN 13203-3:2022 is intended for:
- Manufacturers designing and certifying solar‑assisted gas hot‑water appliances.
- Test laboratories performing standardized energy consumption tests.
- Product certifiers and regulators evaluating compliance and preparing labels or eco‑design declarations.
- Specifiers, installers and HVAC designers comparing system options and sizing solutions for domestic hot water with solar support.
Using this standard enables apples‑to‑apples comparisons of solar supported gas-fired appliances, optimized product selection, and consistent energy claims for marketing and regulatory compliance.
Related standards (key references)
- EN 13203-1:2015 - Performance of hot water delivery
- EN 13203-2:2022 - Assessment of energy consumption (non‑solar baseline and referenced clauses)
- EN 12975-1/2 - Solar collectors (requirements and test methods)
- EN 12976-1/2 - Factory‑made thermal solar systems (requirements and tests)
- EN ISO 9488:1999 - Solar terms and definitions
Keywords: EN 13203-3:2022, gas-fired domestic appliances, solar supported, energy consumption, domestic hot water, solar collector, solar thermal, test procedures.
Relations
- Effective Date
- 17-Aug-2022
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Refers
EN 12976-2:2019 - Thermal solar systems and components - Factory made systems - Part 2: Test methods - Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Refers
EN 12975-2:2006 - Thermal solar systems and components - Solar collectors - Part 2: Test methods - Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
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Frequently Asked Questions
EN 13203-3:2022 is a standard published by the European Committee for Standardization (CEN). Its full title is "Gas-fired domestic appliances producing hot water - Part 3: Assessment of energy consumption of solar supported gas-fired appliances". This standard covers: This document is applicable to solar supported gas-fired appliances producing domestic hot water. It applies to a system marketed as single unit or a fully specified system that: - has a gas heat input not exceeding 70 kW; - has a hot water storage tank capacity not exceeding 500 l; - is equipped with at least one solar collector; - is, with regard to the solar hydraulic circuit, considered as a forced circulation system (definition according to EN ISO 9488:1999). The appliances covered by this document are described in Annex E (normative). This document does not apply to thermo-siphon or integral collector storage tank systems according to definitions given by EN ISO 9488:1999. NOTE In principle, the energy consumption of thermo-siphon solar preheat systems and integral collector storage tank preheat systems can also be assessed based on this document. One appropriate procedure for that purpose is to calculate the temperature level of the domestic hot water withdrawn from the thermal solar system for the reference conditions specified in this standard by using the numerical system model and the thermal solar system performance parameters according to ISO 9459-5. Based on the temperature level of the hot water withdrawn from the store the energy consumption of the gas appliance is determined. This determination can either be done by means of calculations or by performing a test according to EN 13203 2:2022 and using instead of the cold water inlet temperature the hot water temperature withdrawn from the store. This document is not intended to assess the performance: - of the solar collector(s), which should comply with EN 12975-1:2006+A1:2010 and EN 12975-2:2006; - of thermal solar systems and components, which should comply with EN 12976-1:2021 and EN 12976-2:2019. 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 presenting the information to the user. The present document sets out a method for assessing the energy performance of a solar supported appliance. It specifies a few daily tapping cycles for each domestic hot water use, kitchen, shower, bath and a combination of these, together with corresponding test procedures including information about the available solar radiation. It enables the energy performances of different gas-fired appliances to be compared and matched to the needs of the user.
This document is applicable to solar supported gas-fired appliances producing domestic hot water. It applies to a system marketed as single unit or a fully specified system that: - has a gas heat input not exceeding 70 kW; - has a hot water storage tank capacity not exceeding 500 l; - is equipped with at least one solar collector; - is, with regard to the solar hydraulic circuit, considered as a forced circulation system (definition according to EN ISO 9488:1999). The appliances covered by this document are described in Annex E (normative). This document does not apply to thermo-siphon or integral collector storage tank systems according to definitions given by EN ISO 9488:1999. NOTE In principle, the energy consumption of thermo-siphon solar preheat systems and integral collector storage tank preheat systems can also be assessed based on this document. One appropriate procedure for that purpose is to calculate the temperature level of the domestic hot water withdrawn from the thermal solar system for the reference conditions specified in this standard by using the numerical system model and the thermal solar system performance parameters according to ISO 9459-5. Based on the temperature level of the hot water withdrawn from the store the energy consumption of the gas appliance is determined. This determination can either be done by means of calculations or by performing a test according to EN 13203 2:2022 and using instead of the cold water inlet temperature the hot water temperature withdrawn from the store. This document is not intended to assess the performance: - of the solar collector(s), which should comply with EN 12975-1:2006+A1:2010 and EN 12975-2:2006; - of thermal solar systems and components, which should comply with EN 12976-1:2021 and EN 12976-2:2019. 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 presenting the information to the user. The present document sets out a method for assessing the energy performance of a solar supported appliance. It specifies a few daily tapping cycles for each domestic hot water use, kitchen, shower, bath and a combination of these, together with corresponding test procedures including information about the available solar radiation. It enables the energy performances of different gas-fired appliances to be compared and matched to the needs of the user.
EN 13203-3:2022 is classified under the following ICS (International Classification for Standards) categories: 91.140.65 - Water heating equipment. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 13203-3:2022 has the following relationships with other standards: It is inter standard links to EN 13203-3:2010, EN 12976-1:2021, EN 13203-1:2015, EN 12976-2:2019, EN 13203-2:2022, EN 12975-1:2006+A1:2010, EN 12975-2:2006, EN 12897:2016+A1:2020, EN 12897:2016. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 13203-3:2022 is associated with the following European legislation: EU Directives/Regulations: 2016/426, 80/779/EEC, 811/2013, 812/2013, 813/2013, 814/2013; Standardization Mandates: M/534, M/535. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
EN 13203-3:2022 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2022
Nadomešča:
SIST EN 13203-3:2010
Plinske gospodinjske naprave za pripravo tople sanitarne vode - 3. del:
Ocenjevanje rabe energije solarno-plinskih naprav
Gas-fired domestic appliances producing hot water - Part 3: Assessment of energy
consumption of solar supported gas-fired appliances
Gasgeräte für die häusliche Warmwasserbereitung - Teil 3: Bewertung des
Energieverbrauchs solargestützter Gasgeräte
Appareils domestiques produisant de l’eau chaude sanitaire utilisant les combustibles
gazeux - Partie 3 : Évaluation de la consommation énergétique des appareils utilisant les
combustibles gazeux couplés à un capteur solaire
Ta slovenski standard je istoveten z: EN 13203-3:2022
ICS:
91.140.65 Oprema za ogrevanje vode Water heating equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 13203-3
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2022
EUROPÄISCHE NORM
ICS 91.140.65 Supersedes EN 13203-3:2010
English Version
Gas-fired domestic appliances producing hot water - Part
3: Assessment of energy consumption of solar supported
gas-fired appliances
Appareils domestiques produisant de l'eau chaude Gasgeräte für die häusliche Warmwasserbereitung -
sanitaire utilisant les combustibles gazeux - Partie 3 : Teil 3: Bewertung des Energieverbrauchs
Évaluation de la consommation énergétique des solargestützter Gasgeräte
appareils utilisant les combustibles gazeux couplés à
un capteur solaire
This European Standard was approved by CEN on 13 June 2022.
This European Standard was corrected and reissued by the CEN-CENELEC Management Centre on 7 September 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, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATIO N
EUROPÄISCHES KOMITEE FÜR NORMUN G
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 13203-3:2022 E
worldwide for CEN national Members.
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 . 8
4.3.3 Water supply . 8
4.3.4 Initial adjustment of the appliance . 8
4.3.5 Conditions for the determination of the maximum load profile . 9
4.3.6 Electrical supply . 9
4.3.7 Solar circuit . 9
4.3.8 Solar thermal input . 9
5 Determination of the energy consumption of the solar supported gas-fired appliance . 9
5.1 General . 9
5.2 Load profiles and solar cycle. 9
5.3 Determination of the energy recovered by the useful water . 10
5.4 Calculation of gas energy . 10
5.4.1 Calculation of daily gas energy consumption in summer mode . 10
5.4.2 Calculation of daily gas energy consumption in winter mode . 11
5.4.3 Daily gas energy consumption seasonally weighted . 11
5.5 Calculation of daily electrical energy consumption . 11
5.6 Measurement of energy consumption in standby mode . 11
5.6.1 General . 11
5.6.2 Calculation of daily gas energy consumption in standby mode . 11
5.6.3 Calculation of daily auxiliary electrical energy consumption in standby mode . 11
5.7 Determination of daily auxiliary energy consumption in the off mode . 11
6 Determination of ration of wasted water to total water . 11
7 Eco design related products data . 11
7.1 Water heating energy efficiency . 11
7.2 Smart control factor (SFC) and smart . 11
7.3 Annual fuel consumption (AFC) . 11
7.4 Annual electricity consumption (AEC) . 11
Annex A (informative) Test conditions . 12
Annex B (informative) Examples of test rig and measurement devices . 13
Annex C (informative) Declaration of the Maximum Load Profile . 14
Annex D (informative) Solar collector simulator . 15
D.1 General . 15
D.2 Derivation of the equation used for the calculation of T . 16
C,out
D.3 Alternative solar collector simulator . 17
Annex E (normative) Appliances covered by this document . 20
Bibliography . 22
European foreword
This document (EN 13203-3:2022) 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 13203-3:2010.
The main technical changes compared to EN 13203-3:2010 are directly aligned with evolutions of
EN 13203-2, and are the following:
— improvement of editorial errors;
— 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.
NOTE The present document does not meet the requirement in Regulation n° 814/2013, Annex III
measurement, point 4 - Conditions for testing solar water heaters which states: “The solar collector, solar hot
water storage tank, pump in the collector loop (if applicable) and heat generator shall be tested separately.”. The
basis of the present document is that the parts are tested simultaneously, under one set of ambient conditions.
The same applies to Regulation n° 812/2013, Annex VII, point 4.
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.
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.
1 Scope
This document is applicable to solar supported gas-fired appliances producing domestic hot water. It
applies to a system marketed as single unit or a fully specified system that:
— has a gas heat input not exceeding 70 kW;
— has a hot water storage tank capacity not exceeding 500 l;
— is equipped with at least one solar collector;
— is, with regard to the solar hydraulic circuit, considered as a forced circulation system (definition
according to EN ISO 9488:1999).
The appliances covered by this document are described in Annex E (normative).
This document does not apply to thermo-siphon or integral collector storage tank systems according to
definitions given by EN ISO 9488:1999.
NOTE In principle, the energy consumption of thermo-siphon solar preheat systems and integral collector
storage tank preheat systems can also be assessed based on this document. One appropriate procedure for that
purpose is to calculate the temperature level of the domestic hot water withdrawn from the thermal solar system
for the reference conditions specified in this standard by using the numerical system model and the thermal solar
system performance parameters according to ISO 9459-5. Based on the temperature level of the hot water
withdrawn from the store the energy consumption of the gas appliance is determined. This determination can
either be done by means of calculations or by performing a test according to EN 13203-2:2022 and using instead
of the cold water inlet temperature the hot water temperature withdrawn from the store.
This document is not intended to assess the performance:
— of the solar collector(s), which should comply with EN 12975-1:2006+A1:2010 and
EN 12975-2:2006;
— of thermal solar systems and components, which should comply with EN 12976-1:2021 and
EN 12976-2:2019.
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 presenting the information to the user.
The present document sets out a method for assessing the energy performance of a solar supported
appliance. It specifies a few daily tapping cycles for each domestic hot water use, kitchen, shower, bath
and a combination of these, together with corresponding test procedures including information about
the available solar radiation. It enables the energy performances of different gas-fired appliances to be
compared and matched to the needs of the user.
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 12975-1:2006+A1:2010, Thermal solar systems and components — Solar collectors — Part 1: General
requirements
EN 12975-2:2006, Thermal solar systems and components — Solar collectors — Part 2: Test methods
EN 12976-1:2021, Thermal solar systems and components — Factory made systems — Part 1: General
requirements
EN 12976-2:2019, Thermal solar systems and components — Factory made systems — Part 2: Test
methods
EN 13203-1:2015, Gas-fired domestic appliances producing hot water — Part 1: Assessment of
performance of hot water deliveries
EN 13203-2:2022, Gas-fired domestic appliances producing hot water —
...