National foreword

This British Standard is the UK implementation of EN 18021:2025.

The UK participation in its preparation was entrusted to Technical Committee B/504/-/8, Sanitary tapware.

A list of organizations represented on this committee can be obtained on request to its committee manager.

Contractual and legal considerations

This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BSI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law.

This publication is provided as is, and is to be used at the recipient’s own risk.

The recipient is advised to consider seeking professional guidance with respect to its use of this publication.

This publication is not intended to constitute a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2025.

This European Standard was approved by CEN on 4 May 2025.

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, Czechia, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and United Kingdom.

European foreword

This document (EN 18021:2025) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by AFNOR.

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 January 2026, and conflicting national standards shall be withdrawn at the latest by January 2026.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document has been prepared under a standardization request addressed to CEN by the European Commission. The Standing Committee of the EFTA States subsequently approves these requests for its Member States.

Any feedback and questions on this document should be directed to the users’ national standards body. A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United Kingdom.

Introduction

In respect of potential adverse effects on the quality of water intended for human consumption, caused by the products covered by this document.

This document provides no information as to whether the products can be used without restriction in any of the Member States of the EU or EFTA.

While awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of these products remain in force.

This document defines the test procedures for the calculation of energy and measurements of functional performance for taps, shower outlets, shower sets and shower systems in order to identify energy efficient products.

This document does not define all requirements since these will be set by future EU legislation.

1 Scope

This document acknowledges the field of application for taps, shower outlets, shower sets and shower systems used in water supply systems with a pressure range of (0,05 to 1,0) MPa [(0,5 to 10) bar].

The tests described in this document are type tests (laboratory tests) and not quality control tests carried out during manufacture.

This document covers:

PN10 taps;
PN5 shower outlets;
PN5 shower sets;
PN10 shower systems.

The following products are excluded from this document:

shower taps on its own;
taps for filling bathtubs;
the tub filling function of combined taps;
the function of a tap that delivers e.g. boiling water or sparkling water, etc.;
body or side jet showers.

The conditions of use for taps and shower systems are given in Table 1. The conditions of use for showers sets and shower outlets are given in Table 2.

NOTE Taps and shower systems for use at pressures lower than those in Table 1 are not covered by this standard.

Health and quality requirements in accordance to European and national legislation for final materials in contact with water intended for human consumption are not covered by this document.

2 Normative references

3 Terms and definitions

4 Standard use cases

5 Instructions

5.1 General

5.2 Replacement of components

6 Technical criteria

6.1 General

6.2 Apparatus

6.3 Energy calculation

6.4 Use of flow regulators

7 Taps

7.1 General

7.2 Flow rate testing

7.3 Functional test

7.4 Rinsing performance

8 Shower outlets

8.1 General

8.2 Flow rate

8.3 Functional test

8.4 Rinsing performance

9 Shower sets

9.1 General

9.2 Rinsing performance

10 Shower systems

10.1 General

10.2 Flow rate

10.3 Functional test

10.4 Rinsing performance

Bibliography

BS EN 18021:2025

Sanitary tapware. Measurement of functional performance of taps and showers

Current

Published:

31 Jul 2025