prEN 13203-7

SLOVENSKI STANDARD
oSIST prEN 13203-7:2021
01-februar-2021
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

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

gazeux Partie 7: Evaluation de la consommation énergétique d'une chaudière équipée

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

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

sanitaire utilisant les combustibles gazeux - Partie 7 : Warmwasserbereitung für den Hausgebrauch - Teil 7:

Évaluation de la consommation énergétique d'une Bewertung des Energieverbrauchs von Kombigeräten,

chaudière à deux services équipée d'un dispositif passif ausgerüstet mit einer passiven Vorrichtung zur

de récupération de la chaleur dans les produits de Wärmerückgewinnung im Abgasschacht

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

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

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

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

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

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13203-7:2021 E

European Foreword ...................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 General test conditions ................................................................................................................................. 6

4.1 Reference condition ....................................................................................................................................... 6

4.2 Measurement uncertainties ........................................................................................................................ 6

4.2.1 General ................................................................................................................................................................ 6

4.2.2 Steady-state conditions ................................................................................................................................. 6

4.3 Test conditions ................................................................................................................................................. 6

4.3.1 General ................................................................................................................................................................ 6

4.3.2 Test room ........................................................................................................................................................... 6

4.3.3 Water supply ..................................................................................................................................................... 6

4.3.4 Initial adjustment of the appliance ........................................................................................................... 8

4.3.5 Conditions for the determination of the maximum load profile .................................................... 8

4.3.6 Electrical supply .............................................................................................................................................. 8

5 Determination of applicability of the present standard ................................................................... 9

6 Determination of the energy consumption of the appliances with PFHRD ............................ 10

6.1 General ............................................................................................................................................................. 10

6.2 Load profiles .................................................................................................................................................. 10

6.3 Calculation of gas energy ........................................................................................................................... 10

6.3.1 Determination of the daily gas energy consumption in summer mode (Q ) ..................... 10

6.3.2 Determination of the indirect PFHRD contribution (Q ) ........................................................... 11

6.3.3 Daily gas energy consumption ................................................................................................................ 16

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

Annex A (informative) Test conditions ............................................................................................................. 18

Annex B (informative) Examples of test rig and measurement devices ................................................ 19

Annex C (informative) Declaration of the Maximum Load Profile .......................................................... 20

Bibliography ................................................................................................................................................................. 21

This document (prEN 13203-7:2021) has been prepared by Technical Committee CEN/TC 109 “Central

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

— 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;

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

In the case of combination boilers, with or without storage tank, domestic hot water production is integrated

For this document, some tests and calculation results of EN 13203-2:2020 are used to calculate the energy

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

EN 13203-1:2015, Gas fired domestic appliances producing hot water - Part 1: Assessment of performance of hot

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

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

energy recovered from the flue gases during domestic hot water production and used to preheat the cold

energy recovered from the flue gases during central heating production and used to preheat the cold domestic

arithmetic mean of the adjustable maximum and minimum nominal heat input (kW) as declared by the

device integrated in the appliance or supplied with the appliance to transmit recovered heat

transfer of recovered heat to the PFHRD when the boiler is running in central heating mode by anything else

“For combination gas boiler, the tests shall be carried out only in summer mode as defined in 3.3, and the

“The load profile used for the measurement shall be the one declared in the technical instruction of the

— The domestic water pressure is the static water inlet pressure measured as close as possible to the

— The inlet temperatures are measured immediately upstream of the cold water inlet connection in the

— 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 centre 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. This flow will continue for 10 min after the thermal equilibrium.

Figure 1 — Position of the X sensor for boilers with separated secondary heat exchanger

Figure 2 — Position of the X sensor for boilers with integrated secondary heat exchanger

To ensure that the appliance is in the scope of this standard it shall be proved that during central heating

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

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), 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 of sensor X) shall be

measured with a sample rate not less than once per second. The draw off will be stopped when T ≤ T