EN 13203-1:2015

Gas fired domestic appliances producing hot water - Part 1: Assessment of performance of hot water deliveries

This European Standard is applicable to gas-fired appliances producing domestic hot water. It applies to both instantaneous and storage appliances; water-heaters and combination boilers that have:
-   heat input not exceeding 70 kW; and
-   hot water storage capacity (if any) not exceeding 500 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.
This European Standard 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.

Gasbeheizte Geräte für die sanitäre Warmwasserbereitung für den Hausgebrauch - Teil 1: Bewertung der Leistung der Warmwasserbereitung

Appareils domestiques produisant de l'eau chaude sanitaire utilisant les combustibles gazeux - Partie 1 : Évaluation de la performance en puisage d’eau chaude

La présente norme européenne s’applique aux appareils de production d'eau chaude sanitaire utilisant les combustibles gazeux. Il s’applique à la fois aux appareils instantanés ou à accumulation, chauffe-eau ou chaudières à deux services, qui ont :
-   un débit calorifique inférieur ou égal à 70 kW ; et
-   une capacité de stockage en eau (si elle existe) inférieure ou égale à 500 l.
Dans le cas des chaudières à deux services avec ou sans ballon, la production d’eau chaude sanitaire est intégrée ou accolée, l’ensemble étant commercialisé comme une seule unité.
La présente norme européenne définit en termes qualitatifs et quantitatifs la performance en puisage d'eau chaude sanitaire pour une variété d’usages sélectionnée. Il fournit également un système pour présenter les informations à l’utilisateur.

Plinske gospodinjske naprave za pripravo tople sanitarne vode - 1. del: Ocenjevanje zmogljivosti priprave tople vode

Ta dokument se uporablja za plinske gospodinjske naprave za pripravo tople sanitarne vode. Velja za pretočne in shranjevalne naprave, grelnike za vodo in kombinirane kotle s:
– toplotno močjo, ki ne presega 70 kW in
– prostornino (če je na voljo) za vročo vodo do 500 l.
Pri kombiniranih kotlih, z rezervoarjem ali brez, je priprava tople vode za gospodinjstva integrirana ali združena, pri čemer se celota trži kot ena enota.
Ta dokument v kakovostnem in količinskem smislu določa zmogljivost za pripravo tople sanitarne vode za različne izbrane namene. Zajema tudi sistem za predstavitev informacij uporabniku.

General Information

• Status: Published
• Publication Date: 30-Dec-2015
• Withdrawal Date: 30-Mar-2016
• 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: 9092 - Decision on results of review/2YR ENQ - revise - Review Enquiry
• Completion Date: 02-Dec-2021
• Directive: 2009/125/EC - Directive 2005/32/EC of the European Parliament and of the Council of 6 July 2005 establishing a framework for the setting of ecodesign requirements for energy-using products and amending Council Directive 92/42/EEC and Directives 96/57/EC and 2000/55/EC of the European Parliament and of the Council
• Directive: 2009/142/EC - DIRECTIVE 2009/142/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 30 November 2009 relating to appliances burning gaseous fuels
• 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/495 - Standardisation mandate to CEN, CENELEC and ETSI under Directive 2009/125/EC relating to harmonised standards in the field of Ecodesign
• 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
• Ref Project: SIST EN 13203-1:2015 - Gas fired domestic appliances producing hot water - Part 1: Assessment of performance of hot water deliveries

Relations

• Replaces: EN 13203-1:2006 - Gas-fired domestic appliances producing hot water - Appliances not exceding 70 kW heat input and 300 l water storage capacity - Part 1: Assessment of performance of hot water deliveries
• Effective Date: 30-Sep-2015

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 13203-1:2015
01-december-2015
1DGRPHãþD
SIST EN 13203-1:2006
Plinske gospodinjske naprave za pripravo tople sanitarne vode - 1. del:
Ocenjevanje zmogljivosti priprave tople vode

Gas fired domestic appliances producing hot water - Part 1: Assessment of performance

of hot water deliveries

Gasbeheizte Geräte für die sanitäre Warmwasserbereitung für den Hausgebrauch - Teil

1: Bewertung der Leistung der Warmwasserbereitung

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

gazeux - Partie 1 : Évaluation de la performance en puisage d’eau chaude
Ta slovenski standard je istoveten z: EN 13203-1:2015
ICS:
91.140.65 Oprema za ogrevanje vode Water heating equipment
SIST EN 13203-1:2015 en,fr

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

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SIST EN 13203-1:2015
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SIST EN 13203-1:2015
EN 13203-1
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2015
EUROPÄISCHE NORM
ICS 91.140.65 Supersedes EN 13203-1:2006
English Version
Gas fired domestic appliances producing hot water - Part
1: Assessment of performance of hot water deliveries

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

sanitaire utilisant les combustibles gazeux - Partie 1 : Warmwasserbereitung für den Hausgebrauch - Teil 1:

Évaluation de la performance en puisage d'eau chaude Bewertung der Leistung der Warmwasserbereitung

This European Standard was approved by CEN on 14 August 2015.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels

© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13203-1:2015 E

worldwide for CEN national Members.
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EN 13203-1:2015 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

1 Scope .................................................................................................................................................................... 4

2 Normative references .................................................................................................................................... 4

3 Terms and definitions ................................................................................................................................... 4

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

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

4.2 Measurement uncertainties ........................................................................................................................ 7

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 Steady state ....................................................................................................................................................... 8

4.3.5 Initial adjustment of the appliance ........................................................................................................... 8

4.3.6 Initial state conditions .................................................................................................................................. 9

4.3.7 Electrical supply .............................................................................................................................................. 9

5 Characterisation of the domestic hot water function of appliances ............................................. 9

5.1 General ................................................................................................................................................................ 9

5.2 Characterisation according to the domestic hot water rates .......................................................... 9

5.2.1 Specific rate ....................................................................................................................................................... 9

5.2.2 Tapping capability ....................................................................................................................................... 10

5.2.3 Classification according to the quantity of available domestic hot water ............................... 11

5.3 Classification according to the quality of the domestic hot water produced ......................... 12

5.3.1 Classification procedure ............................................................................................................................ 12

5.3.2 Test for classification according to the performance in delivery of domestic hot

water production ......................................................................................................................................... 13

6 Information .................................................................................................................................................... 15

7 Eco design Related Products Data .......................................................................................................... 16

7.1 Mixed water at 40 °C (V40) ....................................................................................................................... 16

Annex A (informative) Test conditions ............................................................................................................ 17

Annex B (informative) Test rig and measurement devices ...................................................................... 27

B.1 General ............................................................................................................................................................. 27

B.2 Pressure measurement .............................................................................................................................. 28

B.3 Temperature measurement ..................................................................................................................... 28

Annex ZA (informative) Relationship between this European Standard and the

requirements of Commission Regulation (EU) n° 814/2013 ....................................................... 31

Bibliography ................................................................................................................................................................. 32

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SIST EN 13203-1:2015
EN 13203-1:2015 (E)
European foreword

This document (EN 13203-1:2015) 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 March 2016, and conflicting national standards shall

be withdrawn at the latest by March 2016.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent

rights.
This document supersedes EN 13203-1:2006.

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, which is an integral part of this

document.
The main changes in this revision are the following:

— The title of this standard has been changed to: "Gas fired domestic appliances producing hot water

— Part 1: Assessment of performance of hot water deliveries";

— "heat input not exceeding 70 kW" was removed from the title but remains unchanged in the scope;

— "300 litres water storage" has been removed from the title and the scope is changed as following:

hot water storage capacity (if any) not exceeding 500 l;
— A new Clause 7 is added: "7 Eco design Related Products Data";

— An informative Annex ZA is added for the relationship between this European Standard and the

requirements of Commission Regulation (EU) n° 814/2013.

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

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
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1 Scope

This European Standard is applicable to gas-fired appliances producing domestic hot water. It applies to

both instantaneous and storage appliances; water-heaters and combination boilers that have:

— heat input not exceeding 70 kW; and
— hot water storage capacity (if any) not exceeding 500 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.

This European Standard 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.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

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

Not applicable.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
control cycle

time cycle for keeping components and/or the hot storage water tank (if any) of the domestic hot water

circuit at predetermined temperature level, consists of an «ON» duration time during which the heating

of the domestic hot water (by gas energy and auxiliary energy) is operating, and an «OFF» duration time

during which no heating occurs
3.2
domestic water mean temperature
average temperature of the water delivered during the time Δt
T T⋅dt
Note 1 to entry: SYMBOL = T
3.3
domestic water test temperature
temperature of the delivered water at which the tests are conducted
3.4
storage tank
reservoir for domestic hot water
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EN 13203-1:2015 (E)
3.5
kitchen specific rate

domestic hot water rate corresponding to a mean temperature rise of 45 K that the appliance can

supply
Note 1 to entry: SYMBOL = D
Note 2 to entry: D is expressed in litre per minute (l/min)
3.6
minimum declared water rate
lowest water rate stated by the manufacturer maintaining a stable temperature
Note 1 to entry: SYMBOL = D
Note 2 to entry: Dm is expressed in litre per minute (l/min)
3.7
nominal domestic hot water heat input

value of the heat input stated by the manufacturer for the production of domestic hot water

Note 1 to entry: SYMBOL = Q
Note 2 to entry: Q is expressed in kilowatt (kW)
3.8
overall performance factor

numerical value used to quantify the overall performance associated with domestic hot water use,

corresponding to the sum of the products of the particular performance factors multiplied by the

weighting coefficients
Note 1 to entry: SYMBOL = F
F = a .f
∑ ii
i=1
3.9
particular performance factor

numerical value which quantifies each of the performance criteria listed in Table 1

Note 1 to entry: SYMBOL = f
3.10
specific rate

domestic hot water rate declared by the manufacturer corresponding to a mean temperature rise of

30 K that the appliance can supply in two successive delivery periods
Note 1 to entry: SYMBOL = D
Note 2 to entry: D is expressed in litre per minute (l/min)
3.11
summer mode

conditions during which the appliance supplies energy only for the production of domestic hot water

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EN 13203-1:2015 (E)
3.12
tapping capability

hot water delivery rate, declared by the manufacturer, at which water can be drawn off for a specified

time or times (5 min; 10 min; 20 min or continuous) with a predetermined temperature rise

Note 1 to entry: SYMBOL = R
Note 2 to entry: R is expressed in litre per minute (l/min)
3.13
temperature fluctuation at a constant water rate

difference between the minimum and maximum water temperatures that can occur during delivery at a

constant water rate with a constant inlet temperature
Note 1 to entry: SYMBOL = ΔT
Note 2 to entry: ΔT is expressed in Kelvin (K)
3.14
temperature fluctuation between successive deliveries
maximum domestic hot water temperature difference between successive deliveries
Note 1 to entry: SYMBOL = ΔT
Note 2 to entry: ΔT is expressed in Kelvin (K)
3.15
temperature stabilization time following a variation of the water flow rate

time taken to obtain a predetermined fluctuation, following a rapid variation of the water flow rate

Note 1 to entry: SYMBOL = t
Note 2 to entry: t is expressed in second (s)
3.16
temperature variation according to water rate

variation of the mean hot water temperature consequent upon variations of the water flow rate

Note 1 to entry: SYMBOL = ΔT
Note 2 to entry: ΔT is expressed in Kelvin (K)
3.17
waiting time

time taken to reach, at appliance outlet, 90 % of the domestic hot water temperature rise of 45 K

without subsequently falling below 34 K
Note 1 to entry: SYMBOL = t
Note 2 to entry: t is expressed in second (s)
3.18
weighting coefficient

numerical coefficient used to quantify the importance given to each particular performance factor in

connection with the use of domestic hot water
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Note 1 to entry: SYMBOL = a
3.19
rapid response thermometer

measuring instrument with a response time such that 90 % of the final temperature rise, from 15 °C to

100 °C, is obtained within about 1 s, when the sensor is plunged into still water

4 General test conditions
4.1 Reference conditions
Unless otherwise stated, the general test conditions are as follows:
— cold water temperature: 10 °C;
— maximum average variation over the test period: ± 2 K
— cold water pressure: (2 ± 0,1) bar;
— ambient air temperature: 20 °C;
— maximum average variation over the test period ± 1 K
— maximum variation during the tests ± 2 K
— electrical supply voltage: (230 ± 2) V (single phase).
4.2 Measurement uncertainties

Except where otherwise stated in the clauses describing the tests, the uncertainties of measurements

carried out shall not be greater than the maximum uncertainties indicated below.

The standard deviations take account the various sources of uncertainty: contribution from the

instrument, repeatability, calibration, ambient conditions, etc.
— water rate: ± 1 %;
— gas rate: ± 1 %;
— time: ± 0,2 s;
— temperatures:
— ambient: ± 1 K;
— water: ± 0,5 K;
— gas: ± 0,5 K;
— mass: ± 0, 5 %;
— gas pressure: ± 1 %;
— gas calorific value: ± 1 %;
— gas density: ± 0,5 %;
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— electrical energy: ± 2 %.

The stated measurement uncertainties relate to individual measurements. For measurements that

combine a number of individual measurements, smaller uncertainties on the individual measurements

may be necessary to ensure a total uncertainty within ± 2 % under the steady state conditions.

These uncertainties correspond to two standard deviations (2σ).
4.3 Test conditions
4.3.1 General

Except where otherwise stated, the appliance shall be tested under the following conditions.

4.3.2 Test room

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

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

4.3.3 Water supply
For the tests:

— domestic water pressure is the static inlet pressure under dynamic conditions measured as close as

possible to the appliance;

— inlet and outlet temperatures of the domestic water shall be measured in the centre of the flow and

as close as possible to the appliance.

The inlet temperatures shall be measured immediately upstream of the water inlet connection. Except

where otherwise stated, the outlet temperatures shall be measured immediately downstream of the

outlet connection or, in the case of an appliance with spout delivery, by means of an immersed

temperature measuring device, e.g. a u-tube fitted at the outlet of a tube of the same length as the

minimum length of the spout normally supplied by the manufacturer.
The hot water temperature shall be measured with a rapid response thermometer.

"Rapid response thermometer" means a measuring instrument with a response time such that 90 % of

the final temperature rise, from 15 °C to 100 °C, is obtained within about 1 s, when the sensor is

plunged into still water.
4.3.4 Steady state

Steady state operating conditions shall be regarded as established when the appliance operates for

sufficient time to reach thermal stabilization. The steady state is reached when the water temperature

at the outlet does not vary by more than ± 0,5 K.

NOTE This condition can be reached with a gas which is different from the specified test gas, provided that

the appliance is supplied with the specified test gas at least 5 min before the requirements are verified.

4.3.5 Initial adjustment of the appliance

The appliance shall be installed in accordance with the manufacturer's instructions.

The heat input shall be adjusted to within ± 2 % of the nominal domestic hot water heat input.

The delivered water temperature at the appliance outlet is defined as follows (see Figures A.1 and A.2):

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a) appliances with an adjustable temperature: the tests shall be carried out at a temperature not

greater than 65 °C, with a minimum temperature increase equal to or greater than 45 K above

water inlet temperature.

b) appliances with a fixed temperature: the tests shall be carried out at the temperature specified by

the manufacturer, with a minimum temperature increase equal to or greater than 45 K.

The same conditions of initial adjustment stated in the appliance documentation shall be used for all the

tests.
These conditions shall be included in the test report.
4.3.6 Initial state conditions

All the tests of this standard shall be conducted as follows (see Figures A.3 and A.4):

— when there is no control cycle to consider: at least one hour after the previous delivery;

— when there is a control cycle to consider : after a time corresponding to 20 % (but not exceeding

1 h) of the "OFF" time of the burner. The time is taken from the time the burner turns off in the

control cycle.

The same initial state conditions shall be used for all the tests. These conditions shall be included in the

test report.

For appliances with a central heating function, tests shall be conducted in summer mode.

4.3.7 Electrical supply

The appliance shall be supplied with the nominal voltage or a voltage included within the range of

nominal voltages stated in the installation instructions
5 Characterisation of the domestic hot water function of appliances
5.1 General
The domestic hot water function shall be characterised in two different ways:

— firstly, according to the domestic hot water specific rates, the tapping capability and the

corresponding uses (see 5.2);

— secondly, according to the quality of the domestic hot water produced (see 5.3); obtaining a

number of stars corresponding to a determined level of performance.
5.2 Characterisation according to the domestic hot water rates
5.2.1 Specific rate
5.2.1.1 Requirement

The measured value of the specific rate shall be not lower than 95 % of that stated by the appliance

documentation.
5.2.1.2 Test

The appliance shall be adjusted to deliver hot water at the rate stipulated by the installation

instructions for this test.
The pressure loss across the appliance shall not exceed 2 bar.
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During the measurement of the specific rate, the minimum temperature increase shall be equal to or

greater than 30 K.

Before the test, the appliance shall be adjusted in accordance with 4.3.5. A first delivery shall be carried

out over a period of 10 min, followed by 20 min with no delivery and then by a second delivery over a

period of 10 min (see Figures A.5 and A.6).

Measurements of temperature and flow rate shall be made and recorded, at intervals not exceeding 2 s.

A plot of temperature against time is made to obtain the mean water temperature rise during each

delivery.
For each delivery the following shall be calculated by the formula:
i(10)
D ⋅ (1)
10 30
where

D is the calculated rate for each delivery; D and D are determined respectively during the

i 1 2
first and second deliveries, in litre per minute (l/min)

m is the quantity of water collected during the first or second delivery with a minimum

i(10)
temperature rise of 30 K, in litre (l);

ΔT is the mean temperature rise of the collected water, in Kelvins (K) during the first and

second deliveries

If the difference between D1 and D2 does not exceed numerically 10 % of their average value then

D + D
D = (2)
where D is the determined specific rate.

If the difference between D and D exceeds numerically 10 % of their average value, then D is the lower

1 2
value.
The kitchen specific rate (D ) shall be calculated by the formula:
(3)
DD⋅

NOTE When the water temperature is adjustable, additional measurement of the specific rate with a delivery

temperature can be specified by the appliance documentation.
5.2.2 Tapping capability
5.2.2.1 Requirement

The appliance shall be capable of delivering water at the rate stated in the appliance documentation

with a temperature rise not less than 30 K, for the standard time of 10 min and continuously. Additional

flow rate times of 5 min and 20 min can be used in accordance to the appliance documentation.

The tapping capability corresponding to these time periods shall be available to the consumer.

The measured tapping capability shall not be more than 5 % below the value stated by the appliance

documentation.
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5.2.2.2 Test

The appliance shall be adjusted to deliver water at the flow rate and temperature stated by the

appliance documentation for this test.
The pressure loss across the appliance shall not exceed 2 bar.

Before starting the tapping test, the appliance shall be in the initial state conditions and in the initial

adjustment conditions defined in 4.3.5 and 4.3.6. The flow rate and temperature of the delivery are

recorded at intervals not exceeding 2 s. The domestic water mean temperature is calculated.

Tapping capability shall be measured during the standardized times 10 minutes and continuously (with

the additional options of 5 min and/or 20 min).

For the test with a non-continuous delivery, the test shall be run for the standardized time(s) with a

tolerance of ± 30 s. During the test, the temperature rise shall not fall below 30 K (see Figures A.7 and

A.8).
The tapping capability shall be calculated by the formula:
∆T t
R=R⋅⋅ (4)
30 t
where
t time recorded during the test
t standardized time
ΔT mean water temperature increase (3.17)
R tapping capability stated by the appliance documentation
R mean rate recorded during the test
t should be t ± 30 s.

For the test with a continuous delivery, the measurement of the rate shall be carried out following the

test for the tapping capability with the standardized time of 10 min. Without stopping the appliance, the

delivery rate shall be adjusted to the value stated by the technical instructions for the continuous rate

(see Figures A.7 and A.8).
The tapping capability shall be calculated by the formula:
R R⋅ (5)

The burner remains in operation and the temperature rise shall not vary by more than ± 2 K.

5.2.3 Classification according to the quantity of available domestic hot water

Depending on the value obtained, the tapping capability within 10 min is used to classify the quantity of

available domestic hot water, as indicated below.
Value of the tapping capability at 10 min:
— R < 10 l/min Label : 1 tap
— 10 ≤ R (10 min) < 15 l/min Label : 2 taps
— 15 ≤ R (10 min) < 20 l/min Label : 3 taps
— R (10 min) ≥ 20 l/min Label : 4 taps
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5.3 Classification according to the quality of the domestic hot water produced
5.3.1 Classification procedure

The classification of appliances according to the performance in delivery of the domestic hot water

takes account of a certain number of particular performance criteria; these criteria are as follows:

— waiting time, t ;
— variation of the temperature according to the water rate, ΔT ;
— temperature fluctuation (during delivery at a constant water rate), ΔT ;
— temperature stabilization time in case of variation of the water rate, t ;
— minimum nominal water rate, D ;
— temperature fluctuation between successive deliveries, ΔT

Depending on the test results obtained, each particular performance criterion is given a score of

between 0 and 3, called the "particular performance factor" f .

In addition, each criterion is associated with a weighting coefficient (a ) corresponding to a ranking of

importance.

An overall performance factor, F, is calculated to quantify the performance associated with the domestic

hot water delivered.

This factor F is obtained by calculating the sum of the products of the particular performance factors

multiplied by the corresponding weighting coefficients.

The particular performance factors and the weighting factors corresponding to each of the criteria

considered are given in Table 1.
Table 1 — Symbols of particular performance and weighting criteria
Weighting
Symbol
Particular performance factor (f ) coefficient
Particular performance
(as in
criterion
Clause 3)
0 1 2 3
Waiting time t > 60 s ≤ 60 s ≤ 35 s ≤ 5 s 4
Temperature variation
ΔT > 10 K ≤ 10 K ≤ 5 K ≤ 2 K 3
according to water rate
Temperature fluctuation at
ΔT > 5 K ≤ 5 K ≤ 3 K ≤ 2 K 3
constant water rate
Temperature stabilization
t ≥ 60 s < 60 s < 30 s < 10 s 2
time
Minimum nominal water rate D > 6 l/min ≤ 6 l/min ≤ 4 l/min ≤ 2 l/min 1
Temperature fluctuation
between successive ΔT > 20 K ≤ 20 K ≤ 10 K ≤ 5 K 1
deliveries
The overall performance factor F shall be calculated by the formula:
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F af⋅ (6)
∑ ii
i=1

Depending on the value obtained, the overall performance factor F is used to classify

...

SLOVENSKI STANDARD
kSIST FprEN 13203-1:2015
01-maj-2015
Plinske gospodinjske kurilne naprave za pripravo tople sanitarne vode - 1. del:
Ocenjevanje zmogljivosti priprave tople vode

Gas fired domestic appliances producing hot water - Part 1: Assessment of performance

of hot water deliveries

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

gazeux - Partie 1: Evaluation de la performance en puisage d'eau chaude
Ta slovenski standard je istoveten z: FprEN 13203-1
ICS:
91.140.65 Oprema za ogrevanje vode Water heating equipment
kSIST FprEN 13203-1:2015 en,fr

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

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kSIST FprEN 13203-1:2015
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kSIST FprEN 13203-1:2015
EUROPEAN STANDARD
FINAL DRAFT
FprEN 13203-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2015
ICS 91.140.65 Will supersede EN 13203-1:2006
English Version
Gas fired domestic appliances producing hot water - Part 1:
Assessment of performance of hot water deliveries
Appareils domestiques produisant de l'eau chaude sanitaire
utilisant les combustibles gazeux - Partie 1: Evaluation de la
performance en puisage d'eau chaude

This draft European Standard is submitted to CEN members for unique acceptance procedure. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels

© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. FprEN 13203-1:2015 E

worldwide for CEN national Members.
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Contents Page

Foreword ..............................................................................................................................................................3

1 Scope ......................................................................................................................................................4

2 Normative references ............................................................................................................................4

3 Terms and definitions ...........................................................................................................................4

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

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

4.2 Measurement uncertainties ..................................................................................................................7

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 Steady state ............................................................................................................................................8

4.3.5 Initial adjustment of the appliance .......................................................................................................8

4.3.6 Initial state conditions ...........................................................................................................................9

4.3.7 Electrical supply ....................................................................................................................................9

5 Characterisation of the domestic hot water function of appliances ................................................9

5.1 General ....................................................................................................................................................9

5.2 Characterisation according to the domestic hot water rates ............................................................9

5.2.1 Specific rate ............................................................................................................................................9

5.2.2 Tapping capability .............................................................................................................................. 10

5.2.3 Classification according to the quantity of available domestic hot water.................................... 11

5.3 Classification according to the quality of the domestic hot water produced .............................. 12

5.3.1 Classification procedure .................................................................................................................... 12

5.3.2 Test for classification according to the performance in delivery of domestic hot water

production ........................................................................................................................................... 14

6 Information .......................................................................................................................................... 16

7 Eco design Related Products Data ................................................................................................... 16

7.1 Mixed water at 40 °C (V40) ................................................................................................................. 16

Annex A (informative) Test conditions ........................................................................................................ 17

Annex B (informative) Test rig and measurement devices ....................................................................... 27

B.1 General ................................................................................................................................................. 27

B.2 Pressure measurement ...................................................................................................................... 28

B.3 Temperature measurement ................................................................................................................ 28

Annex ZA (informative) Relationship between this European Standard and the requirements of

Commission Regulation (EC) n° 814/2013 ....................................................................................... 31

Bibliography ..................................................................................................................................................... 32

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Foreword

This document (FprEN 13203-1:2015) 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 Unique Acceptance Procedure.
This document will supersede EN 13203-1:2006.

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, which is an integral part of this document.

The main changes in this revision are the following:

— The title of this standard has been changed to: "Gas fired domestic appliances producing hot water —

Part 1: Assessment of performance of hot water deliveries";

— "heat input not exceeding 70 kW" was removed from the title but remains unchanged in the scope;

— "300 litres water storage" has been removed from the title and the scope is changed as following: hot

water storage capacity (if any) not exceeding 500 l;
— A new Clause 7 is added: "7 Eco design Related Products Data";

— An informative Annex ZA is added for the relationship between this European Standard and the

requirements of Commission Regulation (EC) n° 814/2013.

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

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1 Scope

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

instantaneous and storage appliances; water-heaters and combination boilers that have:

— heat input not exceeding 70 kW; and
— hot water storage capacity (if any) not exceeding 500 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.

The present document 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.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated references,

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

Not applicable.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
control cycle

time cycle for keeping components and/or the hot storage water tank (if any) of the domestic hot water circuit

at predetermined temperature level, consists of an «ON» duration time during which the heating of the

domestic hot water (by gas energy and auxiliary energy) is operating, and an «OFF» duration time during

which no heating occurs
3.2
domestic water mean temperature
average temperature of the water delivered during the time Δt
T = T ⋅ dt
Note 1 to entry: SYMBOL = T
3.3
domestic water test temperature
temperature of the delivered water at which the tests are conducted
3.4
storage tank
reservoir for domestic hot water
3.5
kitchen specific rate

domestic hot water rate corresponding to a mean temperature rise of 45 K that the appliance can supply

Note 1 to entry: SYMBOL = D
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Note 2 to entry: D is expressed in litre per minute (l/min)
3.6
minimum declared water rate
lowest water rate stated by the manufacturer maintaining a stable temperature
Note 1 to entry: SYMBOL = D
Note 2 to entry: D is expressed in litre per minute (l/min)
3.7
nominal domestic hot water heat input

value of the heat input stated by the manufacturer for the production of domestic hot water

Note 1 to entry: SYMBOL = Q
Note 2 to entry: Q is expressed in kilowatt (kW)
3.8
overall performance factor

numerical value used to quantify the overall performance associated with domestic hot water use,

corresponding to the sum of the products of the particular performance factors multiplied by the weighting

coefficients
Note 1 to entry: SYMBOL = F
F= ai.fi
i=1
3.9
particular performance factor

numerical value which quantifies each of the performance criteria listed in Table 1

Note 1 to entry: SYMBOL = f
3.10
specific rate

domestic hot water rate declared by the manufacturer corresponding to a mean temperature rise of 30 K that

the appliance can supply in two successive delivery periods
Note 1 to entry: SYMBOL = D
Note 2 to entry: D is expressed in litre per minute (l/min)
3.11
summer mode

conditions during which the appliance supplies energy only for the production of domestic hot water

3.12
tapping capability

hot water delivery rate, declared by the manufacturer, at which water can be drawn off for a specified time or

times (5 ; 10 ; 20 min or continuous) with a predetermined temperature rise
Note 1 to entry: SYMBOL = R
Note 2 to entry: R is expressed in litre per minute (l/min)
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3.13
temperature fluctuation at a constant water rate

difference between the minimum and maximum water temperatures that can occur during delivery at a

constant water rate with a constant inlet temperature
Note 1 to entry: SYMBOL = ΔT
Note 2 to entry: ΔT is expressed in Kelvin (K)
3.14
temperature fluctuation between successive deliveries
maximum domestic hot water temperature difference between successive deliveries
Note 1 to entry: SYMBOL = ΔT
Note 2 to entry: ΔT is expressed in Kelvin (K)
3.15
temperature stabilization time following a variation of the water flow rate

time taken to obtain a predetermined fluctuation, following a rapid variation of the water flow rate

Note 1 to entry: SYMBOL = t
Note 2 to entry: t is expressed in second (s)
3.16
temperature variation according to water rate

variation of the mean hot water temperature consequent upon variations of the water flow rate

Note 1 to entry: SYMBOL = ΔT
Note 2 to entry: ΔT is expressed in Kelvin (K)
3.17
waiting time

time taken to reach, at appliance outlet, 90 % of the domestic hot water temperature rise of 45 K without

subsequently falling below 34 K
Note 1 to entry: SYMBOL = t
Note 2 to entry: t is expressed in second (s)
3.18
weighting coefficient

numerical coefficient used to quantify the importance given to each particular performance factor in

connection with the use of domestic hot water
Note 1 to entry: SYMBOL = a
3.19
rapid response thermometer

measuring instrument with a response time such that 90 % of the final temperature rise, from 15 °C to 100 °C,

is obtained within about 1 s, when the sensor is plunged into still water
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4 General test conditions
4.1 Reference conditions
Unless otherwise stated, the general test conditions are as follows:
— cold water temperature: 10 °C;
— maximum average variation over the test period: ± 2 K
— cold water pressure: (2 ± 0,1) bar;
— ambient air temperature: 20 °C;
— maximum average variation over the test period ± 1 K
— maximum variation during the tests ± 2 K
— electrical supply voltage: (230 ± 2) V (single phase).
4.2 Measurement uncertainties

Except where otherwise stated in the clauses describing the tests, the uncertainties of measurements carried

out shall not be greater than the maximum uncertainties indicated below.

The standard deviations take account the various sources of uncertainty: contribution from the instrument,

repeatability, calibration, ambient conditions, etc.
— water rate: ± 1 %;
— gas rate: ± 1 %;
— time: ± 0,2 s;
— temperatures :
— ambient: ± 1 K;
— water: ± 0,5 K;
— gas: ± 0,5 K;
— mass: ± 0, 5 %;
— gas pressure: ± 1 %;
— gas calorific value: ± 1 %;
— gas density: ± 0,5 %;
— electrical energy: ± 2 %.

The stated measurement uncertainties relate to individual measurements. For measurements that combine a

number of individual measurements, smaller uncertainties on the individual measurements may be necessary

to ensure a total uncertainty within ± 2 % under the steady state conditions.
These uncertainties correspond to two standard deviations (2σ).
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4.3 Test conditions
4.3.1 General

Except where otherwise stated, the appliance shall be tested under the following conditions.

4.3.2 Test room

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

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

4.3.3 Water supply
For the tests:

— domestic water pressure is the static inlet pressure under dynamic conditions measured as close as

possible to the appliance;

— inlet and outlet temperatures of the domestic water shall be measured in the centre of the flow and as

close as possible to the appliance.

The inlet temperatures shall be measured immediately upstream of the water inlet connection. Except where

otherwise stated, the outlet temperatures shall be measured immediately downstream of the outlet connection

or, in the case of an appliance with spout delivery, by means of an immersed temperature measuring device,

e.g. a u-tube fitted at the outlet of a tube of the same length as the minimum length of the spout normally

supplied by the manufacturer.
The hot water temperature shall be measured with a rapid response thermometer.

"Rapid response thermometer" means a measuring instrument with a response time such that 90 % of the

final temperature rise, from 15 °C to 100 °C, is obtained within about 1 s, when the sensor is plunged into still

water.
4.3.4 Steady state

Steady state operating conditions shall be regarded as established when the appliance operates for sufficient

time to reach thermal stabilization. The steady state is reached when the water temperature at the outlet does

not vary by more than ± 0,5 K.

NOTE This condition can be reached with a gas which is different from the specified test gas, provided that the

appliance is supplied with the specified test gas at least 5 min before the requirements are verified.

4.3.5 Initial adjustment of the appliance

The appliance shall be installed in accordance with the manufacturer's instructions.

The heat input shall be adjusted to within ± 2 % of the nominal domestic hot water heat input.

The delivered water temperature at the appliance outlet is defined as follows (see Figures A.1 and A.2):

a) appliances with an adjustable temperature: the tests shall be carried out at a temperature not greater

than 65 °C, with a minimum temperature increase equal to or greater than 45 K above water inlet

temperature.

b) appliances with a fixed temperature: the tests shall be carried out at the temperature specified by the

manufacturer, with a minimum temperature increase equal to or greater than 45 K.
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The same conditions of initial adjustment stated in the appliance documentation shall be used for all the tests.

These conditions shall be included in the test report.
4.3.6 Initial state conditions

All the tests of this standard shall be conducted as follows (see Figures A.3 and A.4):

— when there is no control cycle to consider: at least one hour after the previous delivery;

— when there is a control cycle to consider : after a time corresponding to 20 % (but not exceeding 1 h) of

the "OFF" time of the burner. The time is taken from the time the burner turns off in the control cycle.

The same initial state conditions shall be used for all the tests. These conditions shall be included in the test

report.

For appliances with a central heating function, tests shall be conducted in summer mode.

4.3.7 Electrical supply

The appliance shall be supplied with the nominal voltage or a voltage included within the range of nominal

voltages stated in the installation instructions
5 Characterisation of the domestic hot water function of appliances
5.1 General

The domestic hot water function of domestic hot water appliances shall be characterised in two different ways:

— firstly, according to the domestic hot water specific rates, the tapping capability and the corresponding

uses (see 5.2);

— secondly, according to the quality of the domestic hot water produced (see 5.3); obtaining a number of

stars corresponding to a determined level of performance.
5.2 Characterisation according to the domestic hot water rates
5.2.1 Specific rate
5.2.1.1 Requirement

The measured value of the specific rate shall be not lower than 95 % of that stated by the appliance

documentation.
5.2.1.2 Test

The appliance shall be adjusted to deliver hot water at the rate stipulated by the installation instructions for this

test.
The pressure loss across the appliance shall not exceed 2 bar.

During the measurement of the specific rate, the minimum temperature increase shall be equal to or greater

than 30 K.

Before the test, the appliance shall be adjusted in accordance with 4.3.5. A first delivery shall be carried out

over a period of 10 min, followed by 20 min with no delivery and then by a second delivery over a period of 10

min (see Figures A.5 and A.6).
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The test follows the sequence:
— water delivery of 10 min duration;
— 20 min period of no water delivery;
— further water delivery of 10 min duration.

Measurements of temperature and flow rate shall be made and recorded, at intervals not exceeding 2 s. A plot

of temperature against time is made to obtain the mean water temperature rise during each delivery.

For each delivery the following shall be calculated by the formula:
(10)
∆ = ⋅ …(1)
10 30
where

D is the calculated rate for each delivery; D and D are determined respectively during the first

i 1 2
and second deliveries, in litre per minute (l/min)

m is the quantity of water collected during the first or second delivery with a minimum temperature

i(10)
rise of 30 K, in litre (l);

ΔT is the mean temperature rise of the collected water, in Kelvins (K) during the first and second

deliveries

If the difference between D and D does not exceed numerically 10 % of their average value then

1 2
D + D
1 2
D = …(2)
where D is the determined specific rate.

If the difference between D and D exceeds numerically 10 % of their average value, then D is the lower

1 2
value.
The kitchen specific rate (D ) shall be calculated by the formula:
∆ = ∆ ⋅ …(3)

NOTE When the water temperature is adjustable, additional measurement of the specific rate with a delivery

temperature can be specified by the appliance documentation.
5.2.2 Tapping capability
5.2.2.1 Requirement

The appliance shall be capable of delivering water at the rate stated in the appliance documentation with a

temperature rise not less than 30 K, for the standard time of 10 min and continuously. Additional flow rate

times of 5 min and 20 min can be used in accordance to the appliance documentation.

The tapping capability corresponding to these time periods shall be available to the consumer.

The measured tapping capability shall not be more than 5 % below the value stated by the appliance

documentation.
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5.2.2.2 Test

The appliance shall be adjusted to deliver water at the flow rate and temperature stated by the appliance

documentation for this test.
The pressure loss across the appliance shall not exceed 2 bar.

Before starting the tapping test, the appliance shall be in the initial state conditions and in the initial adjustment

conditions defined in 4.3.5 and 4.3.6. The flow rate and temperature of the delivery are recorded at intervals

not exceeding 2 sec. The domestic water mean temperature is calculated.

Tapping capability shall be measured during the standardised times 10 minutes and continuously (with the

additional options of 5 min and/or 20 min).

For the test with a non-continuous delivery, the test shall be run for the standardised time(s) with a tolerance

of ± 30 s. During the test, the temperature rise shall not fall below 30 K (see Figures A.7 and A.8).

The tapping capability shall be calculated by the formula:
∆T t
R = R ⋅ ⋅ …(4)
30 t
where
t time recorded during the test
t standardized time
ΔT mean water temperature increase (3.17)
R tapping capability stated by the appliance documentation
R mean rate recorded during the test
NOTE t should be t ± 30 sec

For the test with a continuous delivery, the measurement of the rate shall be carried out following the test for

the tapping capability with the standardised time of 10 min. Without stopping the appliance, the delivery rate

shall be adjusted to the value stated by the technical instructions for the continuous rate (see Figures A.7 and

A.8).
The tapping capability shall be calculated by the formula:
R = R ⋅ …(5)

The burner remains in operation and the temperature rise shall not vary by more than ± 2 K.

5.2.3 Classification according to the quantity of available domestic hot water

Depending on the value obtained, the tapping capability within 10 min is used to classify the quantity of

available domestic hot water, as indicated below.
Value of the tapping capability at 10 min:
— R < 10 l/min Label : 1 tap
— 10 ≤ R (10 min) < 15 l/min Label : 2 taps
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— 15 ≤ R (10 min) < 20 l/min Label : 3 taps
— R (10 min) ≥ 20 l/min Label : 4 taps
5.3 Classification according to the quality of the domestic hot water produced
5.3.1 Classification procedure

The classification of appliances according to the performance in delivery of the domestic hot water takes

account of a certain number of particular performance criteria; these criteria are as follows:

— waiting time, t ;
— variation of the temperature according to the water rate, ΔT ;
— temperature fluctuation (during delivery at a constant water rate), ΔT ;
— temperature stabilization time in case of variation of the water rate, t ;
— minimum nominal water rate, D ;
— temperature fluctuation between successive deliveries, ΔT

Depending on the test results obtained, each particular performance criterion is given a score of between 0

and 3, called the "particular performance factor" f .

In addition, each criterion is associated with a weighting coefficient (a) corresponding to a ranking of

importance.

An overall performance factor, F, is calculated to quantify the performance associated with the domestic hot

water delivered.

This factor F is obtained by calculating the sum of the products of the particular performance factors multiplied

by the corresponding weighting coefficients.

The particular performance factors and the weighting factors corresponding to each of the criteria considered

are given in Table 1.
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Table 1 — Symbols of particular performance and weighting criteria
Weighting
Symbol
Particular performance factor (f ) coefficient
Particular performance
(as in
criterion
Clause 3)
0 1 2 3
Waiting time > 60 s ≤ 60 s ≤ 35 s ≤ 5 s 4
Temperature variation
> 10 K ≤ 10 K ≤ 5 K ≤ 2 K 3
according to water rate
Temperature fluctuation at
> 5 K ≤ 5 K ≤ 3 K ≤ 2 K 3
constant water rate
Temperature stabilisation
≥ 60 s < 60 s < 30 s < 10 s 2
time
Minimum nominal water rate > 6 l/min ≤ 6 l/min ≤ 4 l/min ≤ 2 l/min 1
Temperature fluctuation
between successive > 20 K ≤ 20 K ≤ 10 K ≤ 5 K 1
deliveries
The overall performance factor F shall be calculated by the formula:
F = a ⋅ f …(6)
∑ i i
i=1

Depending on the value obtained, the overall performance factor F is used to classify the performance of the

domestic hot water delivered, as indicated in Table 2.
Table 2 — Classification according to factor F
Label Value of the factor F
_ _ _ < 14 points
*_ _ 14 to 27 points
* *_ 28 to 39 points
* * * ≥ 40 points with particular factors ≥ 2
EXAMPLE:
— waiting time < 35 s ⇒ f = 2 ⇒ a .f = 8 points;
i i i

— temperature variation according to the water rate ≤ 2 K ⇒ f = 3 ⇒ a .f = 9 points;

i i i

— temperature fluctuation at a constant water rate ≤ 2 K ⇒ f = 3 ⇒ a .f = 9 points;

i i i
— temperature stabilization time < 30 s ⇒ f = 2 ⇒ a .f = 4 points;
i i i
— minimum nominal water rate ≤ 3,5 l/min ⇒ f = 2 ⇒ a .f = 2 points;
i i i
— temperature fluctuation between successive deliv
...