Electric instantaneous water heaters - Methods for measuring the Performance - Part 1: General requirements

This European Standard applies to electric instantaneous water heaters for domestic hot water heating for household and similar applications, which show both of the following characteristics:
- fulfilling at least one load pattern from Annex A
- heating up to temperatures below the boiling temperature.
This European Standard specifies terms, definitions and measurement methods for the assessment of energy efficiency.
This European Standard does not take into account requirements regarding the safety of the appliances.

Elektro-Durchfluss-Wassererwärmer - Teil 1: Allgemeine Anforderungen

This International Standard is applicable for measurements of the performance of Electric instantaneous water heaters for household use in or under conditions similar to those in households.
The purpose of this standard is to specify essential performance characteristics of Electric instantaneous water heaters being of interest to the users and to describe methods for measuring these characteristics.

Chauffe-eau électriques instantanés - Partie 1: Exigences générales

Električni pretočni grelniki vode - Metode za merjenje lastnosti - 1. del: Splošne zahteve

Ta evropski standard velja za električne pretočne grelnike vode v gospodinjstvih za gospodinjske in podobne aparate, pri katerih velja, da:
– izpolnjujejo vsaj enega od vzorcev obremenitve iz dodatka A,
– grejejo do temperatur pod temperaturo vrelišča.
Ta evropski standard določa izraze, definicije in merilne metode za oceno energijske učinkovitosti.
Ta evropski standard ne zajema zahtev glede varnosti aparatov.

General Information

Status
Published
Publication Date
28-Aug-2016
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
08-Jul-2016
Due Date
12-Sep-2016
Completion Date
29-Aug-2016

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SLOVENSKI STANDARD
SIST EN 50193-1:2016
01-september-2016
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SIST EN 50193-1:2013

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Electric instantaneous water heaters - Methods for measuring the Performance - Part 1:

General requirements
Elektro-Durchfluss-Wassererwärmer - Teil 1: Allgemeine Anforderungen
Chauffe-eau électriques instantanés - Partie 1: Exigences générales
Ta slovenski standard je istoveten z: EN 50193-1:2016
ICS:
91.140.65 Oprema za ogrevanje vode Water heating equipment
97.100.10 (OHNWULþQLJUHOQLNL Electric heaters
SIST EN 50193-1:2016 en,fr

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

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SIST EN 50193-1:2016
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SIST EN 50193-1:2016
EUROPEAN STANDARD EN 50193-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2016
ICS 91.140.65 Supersedes EN 50193-1:2013
English Version
Electric instantaneous water heaters - Methods for measuring
the Performance - Part 1: General requirements

Chauffe-eau électriques instantanés - Partie 1: Exigences Elektro-Durchfluss-Wassererwärmer - Prüfverfahren zur

générales Messung der Gebrauchseigenschaften - Teil 1: Allgemeine
Anforderungen

This European Standard was approved by CENELEC on 2016-05-23. CENELEC 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 CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 50193-1:2016 E
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SIST EN 50193-1:2016
EN 50193-1:2016
Contents

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

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

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

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

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

4.1 Measurement Equipment ....................................................................................................................... 6

4.2 Number of appliances to be tested ........................................................................................................ 6

4.3 General conditions ................................................................................................................................. 6

4.4 Test setup ............................................................................................................................................... 7

5 Energy efficiency .................................................................................................................................... 7

5.1 Test methods .......................................................................................................................................... 7

5.1.1 General................................................................................................................................................ 7

5.1.2 Static efficiency ................................................................................................................................... 7

5.1.3 Start-up losses .................................................................................................................................... 8

5.1.4 Determination of the smart control factor SCF ................................................................................... 8

5.1.5 Determination of smart control compliance ......................................................................................... 9

5.2 Calculation methods ............................................................................................................................... 9

5.2.1 General................................................................................................................................................ 9

5.2.2 Daily energy demand .......................................................................................................................... 9

5.2.3 Correction factor .................................................................................................................................. 9

5.2.4 Energy efficiency ................................................................................................................................. 9

5.2.5 Annual electricity consumption ......................................................................................................... 10

Annex A (informative) Load pattern ................................................................................................................. 11

Annex B (normative) Test setup ...................................................................................................................... 15

Annex C (informative) Alternative test methods under development .............................................................. 19

C.1 General ................................................................................................................................................. 19

C.2 Annual energy consumption ................................................................................................................. 19

Annex ZZA (informative) Relationship between this European Standard and the energy labelling

requirements of Commission Delegated Regulation (EU) No 812/2013 aimed to be

covered ................................................................................................................................................. 21

Annex ZZB (informative) Relationship between this European Standard and the ecodesign

requirements of Commission Regulation (EU) No 814/2013 aimed to be covered ............................. 22

Bibliography ...................................................................................................................................................... 23

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SIST EN 50193-1:2016
EN 50193-1:2016
European foreword

This document (EN 50193-1:2016) has been prepared by CLC/TC 59X "Performance of household and

similar electrical appliances".
The following dates are fixed:
• latest date by which this document has to be (dop) 2017-05-23
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2019-05-23
conflicting with this document have to
be withdrawn
This document supersedes EN 50193-1:2013.

EN 50193-1:2016 includes the following significant technical changes with respect to EN 50193-1:2013:

— Alignment of the terms and formulas with those detailed in Commission communication in the

framework of the implementation of Commission Regulation (EU) No 814/2013 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 of Commission Delegated

Regulation (EU) No 812/2013 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 (2014/C 207/03).

— Clarification of the Smart Control Factor and the issues surrounding its application for Electric

Instantaneous Water Heaters.
— Updates to the references and bibliography.

— Addition of an informative annex for alternative test methods under development.

— Addition of Annexes ZZA and ZZB.

This document has been prepared under a mandate given to CENELEC by the European Commission

and the European Free Trade Association, and supports essential requirements of EU Directive(s).

For the relationship with EU Directive(s) see informative Annex ZZA and ZZB, which are integral parts of

this document.
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SIST EN 50193-1:2016
EN 50193-1:2016
1 Scope

This European Standard applies to electric instantaneous water heaters for domestic hot water heating

for household and similar applications, which show both of the following characteristics:

– fulfilling at least one load pattern from Annex A;
– heating up to temperatures below the boiling temperature.

This European Standard specifies terms, definitions and measurement methods for the assessment of

energy efficiency.

This European Standard does not take into account requirements regarding the safety of the appliances.

2 Normative references

The following documents, in whole or in part, are normatively reference 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.

EN 22768-1, General tolerances - Part 1: Tolerances for linear and angular dimensions without individual

tolerance indications (ISO 2768-1)

EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads - Part 1:

Dimensions, tolerances and designation (ISO 228-1)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
instantaneous water heater
appliance intended to heat water while it flows through the appliance
3.1.1
electric instantaneous water heater
electric powered instantaneous water heater
3.1.2
closed instantaneous water heater

instantaneous water heater intended to operate at the pressure of the water system, the flow of water

being controlled by one or more valves in the outlet system
3.1.3
open-outlet instantaneous water heater

instantaneous water heater in which the flow of water is controlled by a valve in the inlet pipe, there

being no valve in the outlet pipe
3.1.4
hydraulic instantaneous water heater

instantaneous water heater each of whose heating elements are switched on or off, depending on the

water flow rate or water pressure
3.2
temperature selector

actuator which presets the temperature set point value of the water outlet and which can be adjusted by

the user
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SIST EN 50193-1:2016
EN 50193-1:2016
3.3
temperature control

actuator which adjusts the temperature of the outlet water by means of varying the flow of water through

the appliance or by varying the power applied to the heater(s) or by a combination of the two

3.4
independent flow control

actuator which adjusts the flow of water through the appliance with no significant change in the outlet

water temperature
3.5
flow regulator

actuator which limits the flow of water through the appliance regardless of variations in line pressure

3.6
flow restrictor
device which defines a flow of water through the appliance for a set pressure
3.7
power selector

actuator which presets electrical power of the unit and which can be adjusted by the user

Note 1 to entry: The water outlet temperature depends on flow rate and/or inlet temperature.

3.8
load profile/load pattern

a means of illustrating the power consumption of an instantaneous water heater over a 24 hour period

3.9
smart control
a system that can demonstrate a reduction in energy consumption
3.10
useable water

water at or above the temperature T for the relevant draw-off and load pattern specified in the tables of

Annex A
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SIST EN 50193-1:2016
EN 50193-1:2016
4 General test conditions
4.1 Measurement Equipment
The table below gives the accuracy of measurement equipment.
Table 1 — Measurement Equipment Accuracy
Measurement Unit Measurement uncertainty Remarks
parameters (accuracy)
Ambient temperature °C/K ± 1 K 5)
Time s ± 0,1 s 2)
Cold inlet water
°C/K ± 0,2 K 2) 101)
temperature
Hot outlet water
°C/K ± 1 K 1) 2)
temperature
Water flow rate l/min ±0,1 l/min or ±1% 2) 4)
Water pressure Mpa ± 5 % 3)
input power kW ± 1 % 2)
Input power W ± 1 % 5)
Voltage V ± 0,5 % 2)
Current A ± 0,5 % 2)

1) Thermocouple with a diameter of maximum 0,5 mm, in midstream, positioned directly at the outlet and inlet of

the appliance.
2) The measured values shall be expressed rounded to one decimal place.
3) The measured values shall be expressed rounded to three decimal places.
4) Whichever is higher
5) The measured values shall be expressed rounded to integer.
±5K

101) The cold water temperature T shall be 15°C for the performance tests according to clause 102ff

cold
(EN 50193-2-1).
4.2 Number of appliances to be tested
The tests shall be performed on the same appliance.
4.3 General conditions

Unless otherwise specified, the appliance shall be installed, commissioned and operated in accordance

with the information provided in the installation and operating instructions.

Commissioning procedures shall be repeated following a supply voltage interruption, if required by the

installation and operating instructions.

The supply voltage shall be maintained at the main terminal at 230 V ± 1 % or at 400 V ± 1 % as defined

by the manufacturer’s installation guide, while the heating elements are switched on. The supply

frequency shall be at a nominal 50 Hz ± 1 %.

The measured voltage and frequency of the power supply used during testing shall be reported.

The tests shall be carried out in a draft free environment at an ambient temperature of 20˚C ± 5˚C. The

environment shall not deviate by more than 2K during the test period.

The flow rates provided to the appliance for the test shall be maintained within a tolerance of ± 0.3l/min or

± 3% whichever is higher but shall be not be below the minimum required for the individual draw-off. The

flow rates supplied during the test shall be reported.
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SIST EN 50193-1:2016
EN 50193-1:2016
Unless otherwise specified cold inlet water temperature shall be 10 °C ± 1 °C
4.4 Test setup

The appliance shall be installed in accordance with the installation instructions.

The load pattern should be chosen according to manufacturer classification. The load profile selected can

be the maximum or one below the maximum load profile the water heater can fulfil.

The measurement setup shall correspond to Annex B.
5 Energy efficiency
5.1 Test methods
5.1.1 General

The following tests are required to enable the values of Q , Q and AEC to be calculated using the

cor
elec

formulas described in 5.2 for a chosen tapping pattern as defined in Annex A. Losses resulting during

idling are not taken into account.
5.1.2 Static efficiency

This test shall measure the static loss of the appliance P at nominal load P under steady state

loss nom
conditions.

If the appliance has a power selector, the selector should be adjusted to the highest value. If the

appliance has an independent flow control, it shall be adjusted to achieve the value stated in the

manufacturer's installation instructions, or where this is not stated, it shall be set to the highest value.

If the appliance has a temperature control, the selector shall be adjusted to the highest value.

For the purpose of this test result is independent from the water inlet temperature; therefore this test can

be carried out with a cold water inlet temperature in the range of 10 to 25°C. The inlet water temperature

and flow rate must be such that the appliance is caused to operate at full power continuously.

The value of P is the power consumption of the appliance measured after a minimum of 30 minutes of

nom
operation under full load conditions.

The value of P is the sum of all internal power losses (product of current and voltage losses between

loss

the terminals and the heating elements) of the appliance measured after a minimum of 30 minutes of

operation under full load conditions.

For instantaneous water heaters with semiconductor power switches (e.g Triacs) the voltage across the

semiconductor power terminals is subtracted from the measured voltage losses, if the semiconductor

power switches are thermally connected to the water pipe. In this case, the heat developed by the

semiconductor power switches is transferred to useful energy to heat up the water.

The static efficiency is calculated from the formula:
PP−
nom loss
η =
static
nom
where
P nominal power consumption of the appliance in kW
nom
P measured internal static losses of the appliance in kW
loss
static efficiency of the appliance as a factor
static
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SIST EN 50193-1:2016
EN 50193-1:2016
5.1.3 Start-up losses

This test shall measure the time t which elapses between energizing the heating elements and the

start

delivery of useable water and the power consumption P of the appliance at steady state during the

static

delivery of useable water for each different draw-off of the chosen load pattern of Annex A. The test

method assumes the power consumption of the appliance during the start-up period is equal to the power

consumed in steady state conditions of the appliance for the specific draw-off i.

If the appliance has a power selector, the selector should be adjusted to the highest value. If the

appliance has an independent flow control, it shall be adjusted to achieve the value stated in the

manufacturer's installation instructions, or where this is not stated, it shall be set to the highest value.

If the appliance has a temperature control, the selector should be adjusted to the highest value.

The prescribed minimum flow rate f of each individual draw-off of the tapping pattern is used as defined

in Annex A. If this is not achievable increase the flow rate until the appliance is able to provide hot water

continuously with static heating conditions This increased flow rate is used for the individual draw-off

instead of the prescribed minimum flow rate. It may be necessary to determine the required flow rate for

each individual draw-off where the product may not be able to run continuously at the prescribed

minimum flow rate by experimentation before beginning the full series of draw-offs for the chosen load

pattern of Annex A.

Three measurements shall be performed for each specific draw-off type i and the mean value calculated

from these measurements. Each of these measurements shall be performed with the product flushed.

This should be done by flowing cold water through the product without the heating elements being

energised and monitoring the inlet and outlet temperatures until the difference between the inlet and

outlet temperatures is within 1K.
The start-up loss for each specific draw-off i is calculated from the formula:
start
Q = P ×
start static
i i
3600
where
t measured start-up time in seconds
start
P measured steady state power consumption in kW for specific draw-off i
static
start-up losses in kWh for specific draw-off i
start
5.1.4 Determination of the smart control factor SCF
SCF = 0

NOTE The calculation of the water heating energy efficiency of water heaters is based on tapping profiles.

These tapping profiles are based on the energy content of the withdrawn water.

In the case of electric instantaneous water heaters (EIWH) different technologies exist, hydraulically and

electronically controlled products. Electronic electric instantaneous water heaters (EEIWH), through an

electronic control system are better able to fine-tune the electrical power co
...

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