prEN IEC 60704-2-21:2026

• Status: Not Published
• Publication Date: 16-Jan-2028
• ICS: 97.040.50 - Small kitchen appliances
• Technical Committee: CLC/TC 59X - Consumer information related to household electrical appliances
• Current Stage: 4020 - Enquiry circulated - Enquiry
• Start Date: 07-Aug-2026
• Due Date: 01-Oct-2024
• Completion Date: 07-Aug-2026
• Ref Project: oSIST prEN IEC 60704-2-21:2026 - Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 2-21: Particular requirements for coffee preparation appliances

prEN IEC 60704-2-21:2026 is a CLC draft for household and similar electrical appliances that prepare coffee. It specifies how to determine airborne acoustical noise from coffee preparation appliances, so results can be compared across laboratories and used for product development, quality control, and noise declaration. The document is intended to be used with IEC 60704-1:2021 and adapts that general test code to coffee machines, grinders, and related appliances.

What does prEN IEC 60704-2-21:2026 specify?

prEN IEC 60704-2-21:2026 applies to coffee preparation appliances for household use and similar use. The examples named in the document include automatic coffee machines, coffee grinders, porta filter coffee machines, pad coffee machines, capsule coffee machines, and filter coffee machines.

prEN IEC 60704-2-21:2026 does not apply to professional appliances for commercial use or to coffee vending machines. In practice, that means it is aimed at domestic and similar products where the noise test has to reflect normal kitchen use rather than commercial service conditions.

The document is organized as follows:

• Clause 1 - Scope
• Clause 2 - Normative references
• Clause 3 - Terms and definitions
• Clause 4 - Measurement methods and acoustical environments
• Clause 6 - Operation and location of appliances under test
• Clause 7 - Measurement of sound power levels
• Clause 9 - Information to be recorded
• Annex A - normative, but not applicable here

What are the key requirements of prEN IEC 60704-2-21:2026?

prEN IEC 60704-2-21:2026 modifies the general noise test code in IEC 60704-1:2021 for coffee preparation appliances. The practical result is that the appliance is tested in a way that matches how it is actually used to make coffee, while keeping the measurements comparable between labs.

Measurement method and uncertainty

Clause 4.2 and 4.3 note that audible discrete tones can increase the estimated standard deviation. When that happens, extra microphone positions or source positions may be needed, using the methods in ISO 3743-1 or ISO 3743-2. For a test lab, this matters when a coffee machine has tonal noise from pumps, grinders, or motors.

Clause 4.5.2 replaces the uncertainty values with tables for grinding, brewing, milk frothing, and the whole cycle. One table gives repeatability and reproducibility values for sound power levels, and the other gives values for declaration and verification in accordance with IEC 60704-3. These values are what make the measured noise result usable for product claims and comparisons.

Preparing the appliance for test

Clause 6.1.1 requires the appliance to be set up with a full water tank, coffee bean container, and milk container if available. A beverage that uses all available main functions shall be selected, with cappuccino preferred if available. Settings are returned to default, or set according to the prescribed values when no reset is available.

The same clause fixes the test materials and fill levels: medium strength or the manufacturer’s instructions, a specified beverage amount, 100% Arabica medium roasted beans, preconditioned beans, and U.H.T. (ultra-heat treated) milk for frothing tests. This reduces lab-to-lab variation and makes the test repeatable.

Clause 6.1.3 requires run-in before noise measurements. The appliance is operated for at least 10 cups or equivalent covering the functions to be measured, with additional minimum operation counts for coffee grinders, coffee percolators, and filter coffee machines. In practice, this means the appliance is not tested when it is still in its first-use state.

How the noise is measured

Clause 6.4.1 requires noise to be measured and reported for all available main functions and for the whole operational cycle. User interaction noise is excluded, so the result reflects the appliance rather than the operator.

Clause 6.4.2 gives the operating conditions for the test, including the way cups, glasses, or containers are selected and how drip sound into the cup is avoided. For manual milk frothing, the measurement uses the supplied milk jug or a specified metal pot.

Clause 6.5 says the standard test table shall not be used, and clause 7.4.1 specifies the A-weighted sound pressure level to be measured during the whole cycle and averaged for single main functions. It also requires the maximum A-weighted sound pressure level with slow time weighting. Separate averaging times are given for grinding, brewing, filter coffee machines and coffee percolators, and milk frothing.

What must be recorded

Clause 9.9.1 requires recording the kind and amount of coffee, the type of capsule or pad, the type of filter holder, and the amount of beverage, where applicable. That record is important because the measured noise depends on the exact brewing setup.

What terms does prEN IEC 60704-2-21:2026 define?

• coffee preparation appliance - an appliance used to prepare coffee.
• automatic coffee machine - a machine where grinding, brewing, milk frothing, or other beverage-preparation phases happen automatically with only minor operator intervention.
• porta filter coffee machine - a manual espresso coffee maker where ground coffee is placed in a filter and hot water is forced through it by steam pressure or a mechanical pump.
• pad coffee machine - a coffee maker that uses prepackaged brewing media in a permeable container.
• capsule coffee machine - a coffee maker that uses prepackaged brewing media in a non-permeable container that must be punctured for brewing.
• main function - at least one of the functions grinding, brewing, and milk frothing.
• U.H.T. (ultra-heat treated) milk - milk prepared and stored for the milk frothing test under the specified temperature and time conditions.

Who uses prEN IEC 60704-2-21:2026?

Manufacturers of coffee preparation appliances use prEN IEC 60704-2-21:2026 to design quieter products and to plan internal noise testing. Test laboratories use it to measure airborne acoustical noise in a way that is comparable across sites. Quality managers and certification teams use it when they need a documented method for noise verification, and buyers can use it when comparing the noise behavior of household coffee machines, grinders, and similar appliances.

Which standards are used with prEN IEC 60704-2-21:2026?

prEN IEC 60704-2-21:2026 is to be used with IEC 60704-1:2021, which provides the general test code that this part supplements and modifies. IEC 60661:1999+AMD1:2003+AMD2:2005 CSV is named for measuring the performance of electric household coffee makers and is used as the source for several terms.

The document also points to ISO 3743-1 and ISO 3743-2 when discrete tones require extra microphone or source positions. ISO 9614-1, ISO 9614-2, and ISO 9614-3 are stated as not applicable to coffee preparation appliances.

What does the prEN IEC 60704-2-21:2026 document contain?

The document contains the test conditions for coffee preparation appliances, including equipment setup, preconditioning, run-in, and the way to operate the appliance during noise measurements. It also contains the measurement procedure for A-weighted sound pressure levels and the whole-cycle maximum level, plus the handling of grinder, brewing, and milk-frothing functions.

Two tables provide the standard deviations used for repeatability, reproducibility, declaration, and verification. Clause 9 gives the information that must be recorded so the measured noise result can be traced back to the appliance configuration and beverage type.

SLOVENSKI STANDARD
01-oktober-2026
Gospodinjski in podobni električni aparati - Postopek preskušanja za ugotavljanje
zvočnega hrupa v zraku - 2-21. del: Posebne zahteve za aparate za pripravo kave
Household and similar electrical appliances - Test code for the determination of airborne
acoustical noise - Part 2-21: Particular requirements for coffee preparation appliances
Ta slovenski standard je istoveten z: prEN IEC 60704-2-21:2026
ICS:
97.040.50 Majhni gospodinjski aparati Small kitchen appliances
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

59L/315/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60704-2-21 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-08-07 2026-10-30
SUPERSEDES DOCUMENTS:
59L/262/CD, 59L/276/CC
IEC SC 59L : SMALL HOUSEHOLD APPLIANCES
SECRETARIAT: SECRETARY:
Italy Mr Davide Pietrosemoli
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

ASPECTS CONCERNED:
Environment
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for
Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
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This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which t hey
are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries”
clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for
submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Household and similar electrical appliances - Test code for the determination of airborne acoustical
noise - Part 2-21: Particular requirements for coffee preparation appliances

PROPOSED STABILITY DATE: 2030
NOTE FROM TC/SC OFFICERS:
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IEC CDV 60704-2-21 © IEC 2026
1 CONTENTS
3 FOREWORD . 3
4 INTRODUCTION . 5
5 1 Scope . 6
6 2 Normative references . 6
7 3 Terms and definitions . 6
8 4 Measurement methods and acoustical environments . 8
9 6 Operation and location of appliances under test . 9
10 7 Measurement of sound power levels . 11
11 9 Information to be recorded . 12
12 Annex A (normative). 13
14 Table 1 – Standard deviations of sound power levels . 8
15 Table 2 – Standard deviations for declaration and verification . 9
IEC CDV 60704-2-21 © IEC 2026
18 INTERNATIONAL ELECTROTECHNICAL COMMISSION
19 ____________
21 HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
22 TEST CODE FOR THE DETERMINATION OF AIRBORNE
23 ACOUSTICAL NOISE –
25 Part 2-21: Particular requirements for coffee preparation appliances
27 FOREWORD
28 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national
29 electrotechnical committees (IEC National Committees). The object of IEC is to promote international co -operation on all
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49 6) All users should ensure that they have the latest edition of this publication.
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53 use of, or reliance upon, this IEC Publication or any other IEC Publications.
54 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable
55 for the correct application of this publication.
56 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights.
57 IEC shall not be held responsible for identifying any or all such patent rights.
58 IEC 60704-2-21 has been prepared by subcommittee 59L: Small household appliances, of IEC technical
59 committee 59: Performance of household and similar electrical appliances. It is an International
60 Standard.
61 The text of this International Standard is based on the following documents:
Draft Report on voting
59L/XX/xxx 59L/XX/xx
63 Full information on the voting for its approval can be found in the report on voting indicated in the above
64 table.
65 The language used for the development of this International Standard is English.
66 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in accordance
67 with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available at
IEC CDV 60704-2-21 © IEC 2026
68 www.iec.ch/members_experts/refdocs. The main document types developed by IEC are described in
69 greater detail at www.iec.ch/publications.
70 This International Standard is to be used in conjunction with IEC 60704-1:2021.
71 This document supplements or modifies the corresponding clauses in IEC 60704-1:2021, so as to
72 establish the test code for coffee preparation appliances. When a particular subclause of
73 IEC 60704‑1:2021 is not mentioned in this document, that subclause is applicable as far as reasonable.
74 Where this standard states "addition", "modification" or "replacement", the relevant requirements, test
75 specifications or explanatory matter in IEC 60704‑1:2021 are to be adapted accordingly.
76 Subclauses, tables and figures that are numbered starting from 101 are additional to those in
77 IEC 60704‑1:2021. Additional annexes are lettered AA, BB, etc.
78 Unless notes are in a new subclause or involve notes in IEC 60704‑1:2021, they are numbered starting
79 from 101, including those in a replaced clause or subclause.
80 In this standard, the following print types are used:
81 • terms defined in Clause 3: bold type
82 A list of all parts in the IEC 60704 series, published under the general title Household and similar
83 electrical appliances – Test code for the determination of airborne acoustical noise, can be found on
84 the IEC website.
85 The committee has decided that the contents of this document will remain unchanged until the stability
86 date indicated on the IEC website under webstore.iec.ch in the data related to the specific document.
87 At this date, the document will be
88 • reconfirmed,
89 • withdrawn,
90 • replaced by a revised edition, or
91 • amended.
IEC CDV 60704-2-21 © IEC 2026
94 INTRODUCTION
95 The measuring conditions specified in this document provide for sufficient accuracy in determining the
96 noise emitted and comparing the results of measurements taken by different laboratories, whilst
97 simulating as far as possible the practical use of coffee preparation appliances in household kitchens.
98 It is recommended to consider the determination of noise levels as part of a comprehensive testing
99 procedure covering many aspects of the properties and performance of coffee preparation appliances.
100 NOTE As stated in the introduction to IEC 60704-1:2021, this test code is concerned with airborne noise only.
IEC CDV 60704-2-21 © IEC 2026
103 HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
104 TEST CODE FOR THE DETERMINATION OF AIRBORNE
105 ACOUSTICAL NOISE –
107 Part 2-21: Particular requirements for coffee preparation appliances
111 1 Scope
112 Addition:
113 These particular requirements apply to coffee preparation appliances for household use and similar use.
114 Examples are included but are not limited to following:
115 • automatic coffee machines
116 • coffee grinders
117 • porta filter coffee machines
118 • pad coffee machines
119 • capsule coffee machines
120 • filter coffee machines
121 This document does not apply to professional appliances for commercial use and coffee vending
122 machines.
123 2 Normative references
124 Modification:
125 The standards ISO 9614-1, -2 and -3 are not applicable on coffee preparation appliances.
126 Addition:
127 IEC 60661:1999+AMD1:2003+AMD2:2005 CSV - Methods for measuring the performance of electric
128 household coffee makers
129 3 Terms and definitions
130 Addition:
131 3.101
132 coffee preparation appliance
133 appliance to pr
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