Gas-fired heating boilers - Part 1: General requirements and tests

Amendment for the addition of ecodesign requirements (Regulation No 813/2013)
and energy labelling requirements (Regulation No 811/2013)
This European Standard specifies the common requirements and test methods concerning, in particular the construction, safety, fitness for purpose, and rational use of energy, as well as the classification, marking and energy labelling of gas-fired central heating boilers that are fitted with atmospheric burners, fan assisted atmospheric burners or fully premixed burners, and are hereafter referred to as “boilers”.
This European Standard is to be used in conjunction with the specific Parts 2 (Part 2-1 and following ones).
This European Standard applies to boilers of types B and C, according to CEN/TR 1749:2014:
a)   that use one or more combustible gases of the three gas families at the pressures stated in EN 437;
b)   where the temperature of the heat transfer fluid does not exceed 105 °C during normal operation;
c)   where the maximum operating pressure in the water circuit does not exceed 6 bar;
d)   which can give rise to condensation under certain circumstances;
e)   which are declared in the installation instructions to be either a “condensing” boiler or a "low temperature boiler" or a “standard boiler”. If no declaration is given the boiler is to be considered a “standard boiler”
f)   which are intended to be installed inside a building or in a partially protected place;
g)   which are intended to produce hot water either by the instantaneous or storage principle, the whole being marketed as a single unit.
This European Standard applies to boilers designed for sealed water systems or for open water systems.
This general standard and the specific standards (see Part 2) provide requirements for boilers with known constructions. For boilers with any alternative constructions, which might not fully be covered by this standard or a specific standard, the risk associated with this alternative construction will need to be assessed.
An example of an assessment methodology, based upon risk assessment, is given in Clause 11.
This European Standard is not intended to cover appliances intended for connection to gas grids where the quality of the distributed gas is likely to vary to a large extent over the lifetime of the appliance.

Heizkessel fur gasförmige Brennstoffe - Teil 1: Allgemeine Anforderungen und Prüfungen

Chaudières de chauffage central utilisant les combustibles gazeux - Partie 1: Exigences générales et essais

Plinski kotli za gretje - 1. del: Splošne zahteve in preskusi

General Information

Status
Not Published
Current Stage
5060 - Closure of Vote - Formal Approval
Due Date
23-Mar-2015
Completion Date
23-Mar-2015

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SLOVENSKI STANDARD
SIST EN 15502-1:2012/kFprA1:2015
01-januar-2015
Plinski kotli za gretje - 1. del: Splošne zahteve in preskusi
Gas-fired heating boilers - Part 1: General requirements and tests
Heizkessel fur gasförmige Brennstoffe - Teil 1: Allgemeine Anforderungen und
Prüfungen

Chaudières de chauffage central utilisant les combustibles gazeux - Partie 1: Exigences

générales et essais
Ta slovenski standard je istoveten z: EN 15502-1:2012/FprA1
ICS:
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
97.100.20 Plinski grelniki Gas heaters
SIST EN 15502-1:2012/kFprA1:2015 en,fr,de

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

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SIST EN 15502-1:2012/kFprA1:2015
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SIST EN 15502-1:2012/kFprA1:2015
EUROPEAN STANDARD
FINAL DRAFT
EN 15502-1:2012
NORME EUROPÉENNE
EUROPÄISCHE NORM
FprA1
October 2014
ICS 27.060.30; 91.140.10
English Version
Gas-fired heating boilers - Part 1: General requirements and
tests

Chaudières de chauffage central utilisant les combustibles Heizkessel fur gasförmige Brennstoffe - Teil 1: Allgemeine

gazeux - Partie 1: Exigences générales et essais Anforderungen und Prüfungen

This draft amendment is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical Committee

CEN/TC 109.

This draft amendment A1, if approved, will modify the European Standard EN 15502-1:2012. If this draft becomes an amendment, CEN

members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this amendment

into the relevant national standard without any alteration.

This draft amendment 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

© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15502-1:2012/FprA1:2014 E

worldwide for CEN national Members.
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SIST EN 15502-1:2012/kFprA1:2015
EN 15502-1:2012/FprA1:2014 (E)
Contents Page

0 Modifications to the Foreword .............................................................................................................5

0.1 Addition after the 4 paragraph of the Foreword ...............................................................................5

0.2 Modification to the 5 paragraph of the Foreword .............................................................................5

1 Modifications to Clause 1, Scope .........................................................................................................6

1.1 Modification to the 1 paragraph of the Scope ..................................................................................6

1.2 Modification to the 3 paragraph of the Scope ..................................................................................6

1.3 Modification to indent e) under the Scope ..........................................................................................6

2 Modifications to Clause 2, Normative references ..............................................................................6

3 Modifications to Clause 3, Terms, definitions and symbols .............................................................7

3.1 Modifications to 3.1.6 Outputs .............................................................................................................7

3.2 Addition of a new subclause 3.1.13 .....................................................................................................7

3.3 Modifications to 3.2, Symbols ..............................................................................................................8

4 Modifications to Clause 4, Classification ............................................................................................9

4.1 Modification to 4.2, Mode of air supply and evacuation of the combustion products ...................9

5 Construction (existing – no change) ...................................................................................................9

6 Electrical safety (existing – no change) ..............................................................................................9

7 Controls (existing – no change) ...........................................................................................................9

8 Modifications to Clause 8, Operational requirements .................................................................... 10

8.1 Modifications to 8.13, NOx ................................................................................................................. 10

8.2 Addition of a new subclause 8.17 ..................................................................................................... 11

9 Modifications to Clause 9, Useful efficiencies ................................................................................. 11

9.1 General (existing – no change) ......................................................................................................... 11

9.2 Modifications to 9.2, Useful efficiency at the nominal heat input .................................................. 11

9.3 Modifications to 9.3, Useful efficiency at part load ......................................................................... 12

9.4 Losses of combination boilers (existing – no change)................................................................... 14

9.5 Compliance with the eco-design regulation for efficiency ............................................................. 14

9.6 Compliance with the Labelling delegated regulation for efficiency .............................................. 17

10 Modifications to Clause 10, Electric auxiliary energy ..................................................................... 19

10.1 General (existing – no change) ......................................................................................................... 19

10.2 System boundaries (existing – no change) ..................................................................................... 19

10.3 Modifications to 10.3, Auxiliary energy at nominal heat input ....................................................... 19

10.4 Auxiliary energy at part load (existing – no change) ...................................................................... 19

10.5 Auxiliary energy at stand-by (existing – no change) ...................................................................... 19

10.6 Auxiliary electricity consumption measurements required for eco-design and labelling

regulations ........................................................................................................................................... 19

11 Risk assessment (existing – no change) ......................................................................................... 20

12 Modifications to Clause 12, Marking and instructions ................................................................... 21

12.1 Modifications to 12.1.1 Data plate ..................................................................................................... 21

13 Requirements for Eco-design Regulation (No 813/2013) and Energy Labelling Regulation

(No 811/2013) ....................................................................................................................................... 21

13.1 Requirements for product information for the Eco-design Regulation (Annex II,

Regulation No 813/2013) .................................................................................................................... 21

13.2 Energy label for Energy Labelling Regulation No 811/2013 Energy Label ................................... 21

13.3 Product fiche for Energy Labelling Regulation 811/2013 ............................................................... 22

14 Modifications to 'Annex J'.................................................................................................................. 25

14.1 Addition of a new Table J.4 ............................................................................................................... 25

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SIST EN 15502-1:2012/kFprA1:2015
EN 15502-1:2012/FprA1:2014 (E)

15 Addition of a new Annex AA .............................................................................................................. 25

16 Addition of a new Annex BB .............................................................................................................. 28

17 Addition of a new Annex CC .............................................................................................................. 32

18 Addition of a new Annex DD .............................................................................................................. 35

19 Modifications to Annex ZA ................................................................................................................. 37

20 Modifications to Annex ZB ................................................................................................................. 39

21 Addition of a new Annex ZC ............................................................................................................... 39

22 Addition of a new Annex ZD ............................................................................................................... 41

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SIST EN 15502-1:2012/kFprA1:2015
EN 15502-1:2012/FprA1:2014 (E)
Foreword

This document (EN 15502-1:2012/FprA1:2014) 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 comprises technical changes to:
- Subclause 7.2, Requirements;
- Subclause 10.2, Minimum required marking of fittings.
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SIST EN 15502-1:2012/kFprA1:2015
EN 15502-1:2012/FprA1:2014 (E)
0 Modifications to the Foreword
0.1 Addition after the 4 paragraph of the Foreword

After the paragraph ending on "with an output of 4 – 400 kW.", add the following:

"This document has been prepared under mandate M/495, given to CEN by the European Commission and

the European Free Trade Association to provide a means of conforming to:

- requirements of Commission Regulation (EC) No 813/2013 of 2 August 2013 implementing Directive

2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for space

heaters and combination heaters;

- requirements of Commission Delegated Regulation (EC) No 811/2013 of 18 February 2013 supplementing

Directive 2010/30/EC of the European Parliament and of the Council with regard to energy labelling of space

heaters, combination heaters, packages of space heater, temperature control and solar device and packages

of combination heater, temperature control and solar device."
0.2 Modification to the 5 paragraph of the Foreword
Replace the existing text of this paragraph:

"For relationship with EU Directive(s), see informative Annex ZA and ZB, which are integral parts of this

document."
with the following:

"For relationship with EU Directive(s) and Commission Regulations, see informative Annexes ZA, ZB, ZC and ZD

which are integral parts of this document."
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SIST EN 15502-1:2012/kFprA1:2015
EN 15502-1:2012/FprA1:2014 (E)
1 Modifications to Clause 1, Scope
1.1 Modification to the 1 paragraph of the Scope
After "marking" add "and energy labelling"
to read:

"This European Standard specifies the common requirements and test methods concerning, in particular the

construction, safety, fitness for purpose, and rational use of energy, as well as the classification, marking and

energy labelling of gas-fired central heating boilers that are fitted with atmospheric burners, fan assisted

atmospheric burners or fully premixed burners, and are hereafter referred to as “boilers”."

1.2 Modification to the 3 paragraph of the Scope
Replace "CEN/TR 1749:2009" with "CEN/TR 1749:2014".
1.3 Modification to indent e) under the Scope
Replace the existing text of the indent e) with the following:

"which are declared in the installation instructions to be either a “condensing” boiler or a "low temperature

boiler" or a “standard boiler” or a "other boiler". If no declaration is given the boiler is to be considered both a

“standard boiler” and an "other boiler"

NOTE The Ecodesign Directive defines "other boilers", "low temperature boilers" and "condensing boilers". The Boiler

Efficiency Directive defines "standard boilers", "low temperature boilers" and "condensing boilers". Depending on the

legislation applied, a boiler can be both "a standard boiler" and an "other boiler"."

2 Modifications to Clause 2, Normative references
Delete the following reference and move it to the Bibliography:

"CR 1404:1994, Determination of emissions from appliances burning gaseous fuels during type-testing".

Replace "CEN/TR 1749:2009" with "CEN/TR 1749:2014".
Add the following references:

"FprEN 13203-2:2014, Gas-fired domestic appliances producing hot water - Part 2: Assessment of energy

consumption"

"EN 15036-1:2006, Heating boilers – Test regulations for airborne noise emissions from heat generators - Part

1: Airborne noise emissions from heat generators"
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SIST EN 15502-1:2012/kFprA1:2015
EN 15502-1:2012/FprA1:2014 (E)
3 Modifications to Clause 3, Terms, definitions and symbols
3.1 Modifications to 3.1.6 Outputs
Add the following term and definition:
"3.1.6.4
rated heat output
Prated

useful output stated by the manufacturer in kW, corresponding to the operation of the boiler in a nominal

(80 °C/60 °C) water temperature regime"
3.2 Addition of a new subclause 3.1.13
Add the following new subclause 3.1.13 after the existing subclause 3.1.12:
"3.1.13 Relevant eco-design and labelling regulations terms
3.1.13.1
electric auxiliary energy for eco-design and labelling regulations

electric energy consumed by the system components such as fan, valves, heating elements required for the

heat generator‘s designed operation, but no circulation pump
3.1.13.2
seasonal space heating energy efficiency

ratio between the space heating demand for a designated heating season, supplied by the boiler and the

annual energy consumption based on GCV required to meet this demand
— Symbol η
— Unit percent (%)
3.1.13.3
water heating energy efficiency

ratio between the useful energy in drinking or sanitary water provided by a combination boiler and the energy

required for its generation based on GCV
— Symbol η
— Unit percent (%)
3.1.13.4
sound power level
A-weighted sound power level, indoors
— Symbol LWA
— Unit dB(A)
3.1.13.5
package

package of boilers or combination boilers, temperature control and solar devices means a package offered to

the end-user containing one or more boilers or combination boilers combined with one or more temperature

controls and/or one or more solar devices
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SIST EN 15502-1:2012/kFprA1:2015
EN 15502-1:2012/FprA1:2014 (E)

Note 1 to entry: Definition based on Labelling Regulation 811/2013 Article 2 - (19) and (20).

3.1.13.6
maximum load profile

load profile for combination water boilers with the greatest reference energy that a combination boiler is able

to provide while fulfilling the temperature and flow rate conditions of that load profile".

3.3 Modifications to 3.2, Symbols

In Table 1, after the symbol for Nominal heat input (Qn), add the following definition:

…. …
Heat input at the arithmetic mean Qa
… …

In Table 1, after the symbol for Nominal output (Pn), add the following definition:

…. …
Useful output at the arithmetic mean Pa
… …

In Table 1, after the symbol for Useful efficiency (η ), add the following definitions:

Seasonal space heating energy efficiency GCV η
Water heating energy efficiency GCV η
Weighted value of the NOx concentration, in NO
x,pond Hs
milligrams per kilowatt-hour (mg/kWh) GCV
Weighted value of the NO concentration, in NO
x x,pond
milligrams per kilowatt-hour (mg/kWh) NCV
The useful efficiency at 30 % of the nominal heat η
input GCV
The useful efficiency at nominal heat input GCV
The useful efficiency at 30 % of the nominal heat η
input NCV
The useful efficiency at nominal heat input NCV η
100
Auxiliary electricity consumption at nominal heat input el
max
[kW]
---------------------- Page: 10 ----------------------
SIST EN 15502-1:2012/kFprA1:2015
EN 15502-1:2012/FprA1:2014 (E)
Auxiliary electricity consumption at 30 % of the el
min
nominal heat input [kW]
Auxiliary electricity consumption at stand-by [kW] P
4 Modifications to Clause 4, Classification

4.1 Modification to 4.2, Mode of air supply and evacuation of the combustion products

Replace "CEN/TR 1749:2009" with "CEN/TR 1749:2014".
5 Construction (existing – no change)
6 Electrical safety (existing – no change)
7 Controls (existing – no change)
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SIST EN 15502-1:2012/kFprA1:2015
EN 15502-1:2012/FprA1:2014 (E)
8 Modifications to Clause 8, Operational requirements
8.1 Modifications to 8.13, NOx
8.1.1 Modifications to 8.13.1, Requirement
Replace the existing text of this subclause with the following:

"The NO class of the boiler is to be stated in the technical instructions according to Table 4. The test and

calculation conditions below shall be applied. The permissible NO concentration assigned to this class in the

dry, air free products of combustion shall not be exceeded.
Table 4 – NO classes
NO -Classes Limit NO concentration Limit NO concentration
x x x
mg/kWh based on NCV mg/kWh based on GCV
1 260
2 200
3 150
4 100
5 70
6 56
8.1.2 Modifications to 8.13.2, Test methods
8.1.2.1 Modifications to 8.13.2.1, General
In the 4 paragraph before the end of the subclause,

After the definition of the symbols for the second formula in 8.13.2.1 add the following line (please note the

indent):

"Annex J provides the factors to be used for correcting dry flue measurement values to mg/kWh".

8.1.2.2 Modification to 8.13.2.2,Weighting
In the tenth line of the existing text, add "on a NCV basis" to read:

"NO weighted value of the NO concentration, in milligrams per kilowatt-hour (mg/kWh)

x,pond x
on a NCV basis"
8.1.3 Addition of a subclause 8.13.3
Add the following subclause after the existing subclause 8.13.2.6:
"8.13.3 NO requirement for Eco-design regulation
Requirement:
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SIST EN 15502-1:2012/kFprA1:2015
EN 15502-1:2012/FprA1:2014 (E)

As from 26 September 2018, for boilers ≤ 400 kW nominal heat output, NO shall not exceed 56 mg/kWh

x,pond Hs

Heat input, based on GCV. This corresponds to the current NO class 6 (see 8.13.1).

Test method:
NO based on NCV is determined in accordance with 8.13.2.
x,pond
NO based on GCV shall be calculated according to the following formula:
x,pond,Hs
NO = × NO
x,pond,Hs x,pond

NO the weighted value of the NO concentration, in milligrams per kilowatt-hour (mg/kWh Heat input)

x,pond,Hs x
on a GCV basis;

= the ratio of the Net to Gross Calorific Value for the appropriate gas family taken from Annex J.".

8.2 Addition of a new subclause 8.17
Add the following subclause after the existing subclause 8.16:
"8.17 Sound power level

From 26 September 2015 the sound power level of gas boilers and combination boilers ≤ 70 kW nominal heat

output shall be declared on the product label and in the product fiche. The declared value shall not be less

than the value measured according to EN 15036-1, when operating in heating mode, taking into account the

tolerances given in EN 15036-1."
9 Modifications to Clause 9, Useful efficiencies
9.1 General (existing – no change)
9.2 Modifications to 9.2, Useful efficiency at the nominal heat input
9.2.1 Modifications to 9.2.1, Requirements
Replace the existing text of this subclause with the following:
"The requirement below for useful efficiency is valid for:
- boilers with a nominal heat output > 400 kW,
- boilers with a nominal heat output ≤ 400 kW until 26 September 2015.

NOTE 1 For boilers with a nominal heat output ≤ 400 kW, from 26 September 2015, see 9.5.

The useful efficiency, measured according to 9.2.2, at nominal heat input, or the maximum heat input for

range rated boilers, expressed in percent, shall be at least:
84 + 2 log10 P ;
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SIST EN 15502-1:2012/kFprA1:2015
EN 15502-1:2012/FprA1:2014 (E)
87,5 + 1,5 log10 P for low temperature boilers;
91 + log10 P for condensing boilers.
where

P is the nominal output (maximum output for range rated boilers), expressed in kilowatts (kW).

NOTE 2 The value of efficiency is calculated using 400 kW as the maximum nominal output.

In addition, for range rated boilers, the efficiency measured according to 9.2.2, at a rate, corresponding to the

arithmetic mean of the maximum and minimum heat input, expressed in percent, shall be at least:

84 + 2 log10 P ;
87,5 + 1,5 log10 P for low temperature boilers;
91 + log10 P for condensing boilers.
where

P is the arithmetic mean of the maximum and minimum useful heat output as stated in the technical

specifications, expressed in kilowatts (kW).

NOTE 3 The limit value of efficiency is calculated using 400 kW as the maximum nominal output. If the minimum useful

heat output is also > 400 kW, then the efficiency will be calculated using 400 kW as P .".

9.3 Modifications to 9.3, Useful efficiency at part load
9.3.1 Modifications to 9.3.1, Requirements
Replace the existing text of this subclause with the following:
"The requirement below for useful efficiency is valid for:
- boilers with a nominal heat output > 400 kW,
- boilers with a nominal heat output ≤ 400 kW until 26 September 2015.

NOTE 1 For boilers with a nominal heat output ≤ 400 kW, from 26 September 2015, see 9.5.

The useful efficiency, measured according to 9.3.2, for a load corresponding to 30 % of the nominal heat input

or for range rated boilers to 30 % of the arithmetic mean of the maximum and minimum heat input, expressed

in percent, shall be at least:
80 + 3 log10 P ;
87,5 + 1,5 log10 P for low temperature boilers
97 + log10 P for condensing boilers
where
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SIST EN 15502-1:2012/kFprA1:2015
EN 15502-1:2012/FprA1:2014 (E)

P is the nominal output P , or the arithmetic mean P of the maximum and minimum useful output

i n a
as stated in the technical instructions for range rated boilers.

NOTE 2 Where Pi is > 400 kW, the value of efficiency is calculated using 400 kW as the maximum nominal output. If the

minimum useful heat output is also > 400 kW, then the efficiency will be calculated using 400 kW as Pi.".

9.3.2 Modifications to 9.3.2 Tests
9.3.2.1 Modifications to 9.3.2.1General
nd rd
Delete the 2 and 3 sentences to read:

"To determine the useful efficiency at a load corresponding to 30 % of the nominal heat input, or for range

rated boilers to 30 % of the arithmetic mean of the maximum and minimum heat input, the manufacturer shall

declare whether the direct method or the indirect method is used.".
9.3.2.2 Modifications to 9.3.2.2.2, Operating mode no 1
Replace the existing text of the 2 paragraph with:

"The boiler return temperature is held constant, for "condensing boilers" at (30 ± 0,5) °C, for "low temperature

boilers" at (37 ± 1) °C, for "standard boilers" at (47 ± 1) °C, and for "other boilers" at (50 ± 1) °C, with a

maximum variation in this temperature of ± 1 K during the measurement period.

NOTE The Ecodesign Directive defines "other boilers", "low temperature boilers" and "condensing boilers". The Boiler

Efficiency Directive defines "standard boilers", "low temperature boilers" and "condensing boilers". Depending on the

legislation applied, a boiler can be both a "standard boiler" and an "other boiler"."

Introduce directly before Table 6 the following text:

"The efficiency for a "standard boiler" can be calculated from the efficiency of an "other boiler" (measured at

50 °C) by adding 0,1 % per degree to the efficiency of the "other boiler". The efficiency of an "other boiler" can

be calculated from the efficiency of a "standard boiler" (measured at 47 °C) by substracting 0,1 % per degree

from the efficiency of a "standard boiler"."

In Table 6 – row 3 reduced rate – column 'cycle time', replace the existing text:

180 Q - 600 Q
21 3
t = 2)"
Q - Q
21 3
with the following:
180 Q - 600 Q
n 3
t = "
Q Q
21 3

9.3.2.3 Modification to 9.3.2.3.1.1, Useful efficiency at the nominal heat input at 50 °C

In the first paragraph of this subclause replace "9.2.1" with "9.2.2" to read:
---------------------- Page: 15 ----------------------
SIST EN 15502-1:2012/kFprA1:2015
EN 15502-1:2012/FprA1:2014 (E)

"The useful efficiency at the nominal heat input (for range rated boilers at the arithmetic mean of the maximum

and the minimum nominal heat input ) is measured according to the test of 9.2.2 with a flow temperature of

(60 ± 2) °C and a return temperature of (40 ± 1) °C.".
9.4 Losses of combination boilers (existing – no change)

Add the following new subclauses 9.5, 9.6 and 9.7 after the existing subclause 9.4:

9.5 Compliance with the eco-design regulation for efficiency
9.5.1 Requirements for seasonal space heating energy efficiency

9.5.1.1 Type B1 boilers with rated heat output ≤ 10kW and Type B1 Combination boilers with rated

heat output ≤ 30kW

As from 26 September 2015 the seasonal space heating efficiency calculated according to 9.5.2 shall be at

least 75 %.

9.5.1.2 Boilers and combination boilers with rated heat output ≤ 70 kW, with the exception of type

B1 boilers with rated heat output ≤ 10 kW and type B1 combination boilers with rated heat output ≤ 30

As from 26 September 2015 the seasonal space heating efficiency calculated according to 9.5.2 shall be at

least 86 %.
9.5.2 Calculations for seasonal space heating energy efficiency
9.5.2.1 Conversion to gross calorific efficiency

All efficiencies measured according to 9.2 and 9.3 are converted from net calorific value (NCV) to gross

calorific value (GCV).
Full load useful efficiency at rated heat output
η =η ×
4 100
where

η is the useful efficiency at nominal heat input Q or for range rated boilers at the arithmetic mean

100 n

of the maximum and minimum heat input Q and shall be determined according to the test of

9.2.2.

is the ratio of the Net to Gross Calorific Value for the appropriate gas family taken from Annex J.

Useful efficiency at 30 % heat output
η =η ×
1 30
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SIST EN 15502-1:2012/kFprA1:2015
EN 15502-1:2012/FprA1:2014 (E)
where

η is the useful efficiency at 30 % of the nominal heat input Q or for range rated boilers at 30 % of the

30 n

arithmetic mean of the maximum and minimum heat input Q and shall be determined according to

the test of 9.2.2.
9.5.2.2 Calculation of the seasonal space heating energy efficiency

The seasonal space heating energy efficiency η is calculated by means of the following formula:

ηη -ΣF(i)
s son
where
η is the seasonal space heating energy efficiency in active mode.
son
η 0,85×+ηη0,15 ×
son 1 4

The correction F(1) accounts for a negative contribution due to absence of temperature controls.

F(1)= 3

The correction F(2) accounts for a negative contribution to the seasonal space heating efficiency by

auxiliary electricity consumption.
F(2)= 2,5× (0,15× el + 0,85 × el +1,3 × P )/(0,15 × P + 0,85 × P ) x 100
max min SB 4 1
where

2,5 = value of the conversion coefficient (CC) means a coefficient reflecting the estimated

40 % average EU generation efficiency;
el shall be determined in accordance with the test of 10.6.3;
max
el shall be determined in accordance with the test of 10.6.4;
min
P shall be dete
...

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