EN 13203-7:2022

SLOVENSKI STANDARD
01-december-2022
Plinske gospodinjske naprave za pripravo tople sanitarne vode - 7. del:
Ocenjevanje rabe energije kombiniranih naprav s prigrajenimi napravami za
vračanje toplote iz dimnih plinov
Gas-fired domestic appliances producing hot water - Part 7: Assessment of energy
consumption of combination boilers equipped with a passive flue heat recovery device
Gasgeräte für die häusliche Warmwasserbereitung - Teil 7: Bewertung des
Energieverbrauchs von Kombigeräten, ausgerüstet mit einer passiven Vorrichtung zur
Wärmerückgewinnung im Abgasschacht
Appareils domestiques produisant de l’eau chaude sanitaire utilisant les combustibles
gazeux - Partie 7 : Évaluation de la consommation énergétique d’une chaudière à deux
services équipée d’un dispositif passif de récupération de la chaleur dans les produits de
combustion
Ta slovenski standard je istoveten z: EN 13203-7:2022
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 13203-7
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2022
EUROPÄISCHE NORM
ICS 91.140.65
English Version
Gas-fired domestic appliances producing hot water - Part
7: Assessment of energy consumption of combination
boilers equipped with a passive flue heat recovery device
Appareils domestiques produisant de l'eau chaude Gasgeräte für die häusliche Warmwasserbereitung -
sanitaire utilisant les combustibles gazeux - Partie 7 : Teil 7: Bewertung des Energieverbrauchs von
Évaluation de la consommation énergétique d'une Kombigeräten, ausgerüstet mit einer passiven
chaudière à deux services équipée d'un dispositif passif Vorrichtung zur Wärmerückgewinnung im
de récupération de la chaleur dans les produits de Abgasschacht
combustion
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 13203-7:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General test conditions . 7
4.1 Reference condition . 7
4.2 Measurement uncertainties . 7
4.2.1 General. 7
4.2.2 Steady-state conditions . 7
4.3 Test conditions . 7
4.3.1 General. 7
4.3.2 Test room . 7
4.3.3 Water supply . 7
4.3.4 Initial adjustment of the appliance . 9
4.3.5 Conditions for the determination of the maximum load profile . 9
4.3.6 Electrical supply . 9
5 Determination of applicability of the present standard . 9
6 Determination of the energy consumption of the appliances with PFHRD . 11
6.1 General. 11
6.2 Load profiles . 11
6.3 Calculation of gas energy . 11
6.3.1 Determination of the daily gas energy consumption in summer mode (Q ) . 11
gas,s
6.3.2 Determination of the indirect PFHRD contribution (Q ) . 12
gas,i
6.3.3 Daily gas energy consumption . 18
7 Eco design related products data . 19
7.1 Water heating energy efficiency . 19
7.2 Smart control factor (SCF) and smart . 19
7.3 Annual fuel consumption (AFC) . 19
7.4 Annual electricity consumption (AEC) . 20
7.5 Mixed water at 40 °C (V40) for storage water heaters . 20
Annex A (informative) Test conditions . 21
Annex B (informative) Examples of test rig and measurement devices . 22
Annex C (informative) Declaration of the Maximum Load Profile . 23
Annex D (informative) Efficiency Performance Buildings calculations . 24
D.1 General. 24
D.2 Determination of the central heating gas consumption in the test (Q ) . 24
gas,CH,test
D.2.1 Short test method . 24
D.2.2 24 h test method . 25
Bibliography . 26

European foreword
This document (EN 13203-7:2022) 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.
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.
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 with the following;
— EN 13203-2:2022, (clause number) is not applicable.

1 Scope
This document is applicable to gas-fired appliances producing domestic hot water. It applies to
condensing combination boilers with passive flue heat recovery device (PFHRD) that have:
— a heat input not exceeding 400 kW;
— a hot water storage tank capacity (if any) not exceeding 2 000 l;
— a declared load profile between M to 4XL.
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.
For this document, some tests and calculation results of EN 13203-2:2022 are used to calculate the
energy consumptions.
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.
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 — Part 2: Assessment of energy
consumption
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 13203-2:2022, Clause 3, with and
the following additions apply:
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
direct PFHRD contribution
energy recovered from the flue gases during domestic hot water production and used to preheat the cold
domestic water
3.2
indirect PFHRD contribution
energy recovered from the flue gases during central heating production, then stored and used to preheat
the cold domestic water
3.3
nominal average heat inputs (Q )
a
arithmetic mean of the adjustable maximum and minimum nominal heat input (kW) as declared by the
technical documentation for range rating appliances
3.4
Passive Flue Heat Recovery Device (PFHRD)
device integrated in the appliance or supplied with the appliance to transmit recovered heat to cold
domestic hot water
3.5
thermal bridge
transfer of recovered heat to the PFHRD when the boiler is running in central heating mode by anything
else than heat from the flue gasses
4 General test conditions
4.1 Reference condition
Shall be according to EN 13203-2:2022, 4.1.
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, with the following modification:
The following sentence is not applicable:
“For combination gas boiler, the tests shall be carried out only in summer mode as defined in 3.3, and the
appliance shall be set in summer mode.”.
The following sentence is modified as follows:
“The load profile used for the measurement shall be the one declared in the technical instruction of the
appliance”.
4.3.2 Test room
Shall be according to EN 13203-2:2022, 4.3.2.
4.3.3 Water supply
EN 13203-2:2022, 4.3.3 is replaced with the following:
“For the tests:
— The domestic water pressure is the static water inlet pressure measured as close as possible to the
product.
— The inlet temperatures are measured immediately upstream of the cold water inlet connection in the
axis of the flow.
— An additional (rapid response) sensor X shall be placed immediately in the domestic water outlet of
the PFHRD construction. This sensor shall be situated in the axis of the flow. If the PFHRD is an
integrated part of the boiler, an adapter is needed to install the temperature sensor X. The technical
documentation shall give a figure of this adapter. The appliance under test shall be fitted with an
adapter that is supplied with the appliance accessories.
Water temperatures shall be measured with a rapid response temperature sensor.

Key
a PFHRD X rapid temperature sensor
b boiler A DHW in
c heat exchanger (CH circuit) B CH in
d heat exchanger (DHW circuit) C CH out
e CH pump D DHW out
f flue
g 3 way valve”
Figure 1 — Position of the X sensor for boilers with separated secondary heat exchanger

Key
a PFHRD X temperature measurement point
b boiler A DHW in
c heat exchanger (CH circuit) B CH in
e CH pump C CH out
f flue D DHW out
Figure 2 — Position of the X sensor for boilers with integrated secondary heat exchanger”.
4.3.4 Initial adjustment of the appliance
Shall be according to EN 13203-2:2022, 4.3.4 with the following modification:
“Load profile XS is not applicable.”.
4.3.5 Conditions for the determination of the maximum load profile
EN 13203-2:2022, 4.3.5 is not applicable.
4.3.6 Electrical supply
Shall be according to EN 13203-2:2022, 4.3.6.
The following new Clause 5 is added: “
5 Determination of applicability of the present standard
To ensure that the appliance is in the scope of this standard it shall be proved that during central heating
production there is no significant heat transfer to the PFHRD construction.
This heat transfer can be caused by a so called “thermal bridge” where conduction, convection (even by
self-circulation in a single tube with a net water flow of zero) and radiation during the production of
central heating water can occur.
Figure 3 — Determination of applicability of the present standard
Test method:
a) The domestic hot water circuit including the PFHRD shall be cooled by a water flow at 10 °C and with
the nominal water flow rate according to EN 13203-1:2015 (5.2) or based on the maximal useful
water flow rate in accordance with the maximum load profile determined by EN 13203-2:2022
(4.3.5), until the appliance water temperature (D in Figures 1 and 2) has reached the thermal
equilibrium. After that, this flow will continue for 10 min.
b) After that the central heating circuit (including the primary heat exchanger) shall be heated up by an
external heat source. The water rate through the boiler is adjusted so as to obtain a return water
temperature of (60 ± 0,5) °C and a temperature difference between flow and return water
temperature of (20 ± 1) °C at an average temperature of 70 °C ± 1 K until thermal equilibrium is
reached. 60 min after this thermal equilibrium, the circulation over the central heating circuit is
stopped.
c) One minute after the circulation stop over the central heating circuit, a domestic water draw off with
cold water of 10 °C and a water flow of 0,5 to 1,0 l/min is started. During this draw off, the water
flow, the cold water inlet temperature T and the water outlet temperature of the PFHRD (T
DHW-in X
of sensor X) shall be measured with a sampling time not exceeding one second. The draw off will be
stopped when T ≤ T + 1 K during 10 (±1) seconds.
x DHW-in
The thermal bridge energy (Q ) in watt-hour (Wh) shall be calculated with the following formula:
tb
t
Q=1000⋅⋅c D ∆T t dt (1)
( )
tb w∫
where
D is the flow rate delivered, in l/min;
ΔT (t) is the domestic water instantaneous temperature rise over the PFHRD (difference over the
cold water sensor and the sensor X), in K;
t is the tapping duration of the domestic water, in min;
−3
c is equal to 1,163⋅10 is the specific heat capacity of water, in kWh/l⋅K.
w
The maximum permitted values for the Q , in Wh, are given in Table 1.
tb
Table 1 — Maximum permitted thermal bridge energy
Load profile M L XL XXL 3XL 4XL
Permitted thermal bridge
energy Q in Wh at 70 °C
16 31 51 65 124 249
tb
central heating temperature
If the thermal bridge energy Q is above the perm
...