SIST EN 12897:2016+A1:2020
(Amendment)Water supply - Specification for indirectly heated unvented (closed) storage water heaters
Water supply - Specification for indirectly heated unvented (closed) storage water heaters
EN 12897:2016+A1 specifies the constructional and performance requirements and methods of test for indirectly heated, unvented (closed) storage water heaters of up to 2 000 l volume suitable for connection to a water supply at a pressure between 0,05 MPa and 1,0 MPa (0,5 bar and 10 bar), and fitted with control and safety devices designed to prevent the temperature of the stored drinking water from reaching 95 °C. Whilst storage water heaters intended primarily for direct heating are not covered by this document, it does allow the provision of electric heating elements for auxiliary use.
Wasserversorgung - Bestimmung für mittelbar beheizte, unbelüftete (geschlossene) Speicher-Wassererwärmer
Dieses Dokument legt die Anforderungen an die Konstruktionstechnik und die Leistung und Prüfverfahren für mittelbar (indirekte) beheizte, unbelüftete (geschlossene) Speicher Wassererwärmer bis zu 2 000 l Volumen fest, die für den Anschluss an ein Wasserversorgungssystem bei einem Druck zwischen 0,05 MPa und 1,0 MPa (0,5 bar und 10 bar) geeignet und mit Regel und Sicherheitseinrichtungen ausgerüstet sind, die so ausgelegt sind, dass die Temperatur des gespeicherten Trinkwassers 95 °C nicht übersteigt.
Obwohl dieses Dokument keine Speicher Wassererwärmer behandelt, die hauptsächlich für direkte Er-wärmung vorgesehen sind, lässt es die Bereitstellung von elektrischen Heizelementen zu Hilfszwecken zu.
Alimentation en eau - Prescriptions pour préparateurs d'eau chaude par accumulation à chauffage indirect non ouverts à l'air libre (fermés)
Oskrba z vodo - Specifikacija za posredno ogrevane neprezračevane (zaprte) akumulacijske grelnike vode
General Information
Relations
Buy Standard
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 12897:2016+A1:2020
01-april-2020
Nadomešča:
SIST EN 12897:2016
Oskrba z vodo - Specifikacija za posredno ogrevane neprezračevane (zaprte)
akumulacijske grelnike vode
Water supply - Specification for indirectly heated unvented (closed) storage water
heatersWasserversorgung - Bestimmung für mittelbar beheizte, unbelüftete (geschlossene)
Speicher-Wassererwärmer
Alimentation en eau - Prescriptions pour préparateurs d'eau chaude par accumulation à
chauffage indirect non ouverts à l'air libre (fermés)Ta slovenski standard je istoveten z: EN 12897:2016+A1:2020
ICS:
91.140.65 Oprema za ogrevanje vode Water heating equipment
SIST EN 12897:2016+A1:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------SIST EN 12897:2016+A1:2020
---------------------- Page: 2 ----------------------
SIST EN 12897:2016+A1:2020
EN 12897:2016+A1
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2020
EUROPÄISCHE NORM
ICS 91.140.65
English Version
Water supply - Specification for indirectly heated
unvented (closed) storage water heaters
Alimentation en eau - Prescriptions pour préparateurs Wasserversorgung - Bestimmung für mittelbar
d'eau chaude par accumulation à chauffage indirect beheizte, unbelüftete (geschlossene) Speicher-
non ouverts à l'air libre (fermés) WassererwärmerThis amendment A1 modifies the European Standard EN 12897:2016; it was approved by CEN on 9 October 2019.
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. 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 amendment 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, 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, Turkey and
United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12897:2016+A1:2020 E
worldwide for CEN national Members.---------------------- Page: 3 ----------------------
SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
Contents Page
European foreword ....................................................................................................................................................... 4
Introduction .................................................................................................................................................................... 5
1 Scope .................................................................................................................................................................... 6
2 Normative references .................................................................................................................................... 6
3 Terms, definitions and symbols ................................................................................................................. 7
3.1 Terms and definitions ................................................................................................................................... 7
3.2 Symbols ............................................................................................................................................................... 8
4 Requirements ................................................................................................................................................... 8
4.1 Constructional requirements ..................................................................................................................... 8
4.1.1 Inspection access ............................................................................................................................................. 8
4.1.2 Draining .............................................................................................................................................................. 8
4.1.3 Hydraulic connections ................................................................................................................................... 8
4.2 Temperature control ..................................................................................................................................... 9
4.3 Mechanical resistance and stability ......................................................................................................... 9
4.3.1 Pressure resistance of water storage vessel ......................................................................................... 9
4.3.2 Pressure resistance of primary heater.................................................................................................... 9
4.3.3 Durability ........................................................................................................................................................... 9
4.3.4 Leakage test on double-walled primary heater ................................................................................ 11
4.4 Safety equipment.......................................................................................................................................... 11
4.4.1 General ............................................................................................................................................................. 11
4.4.2 Energy cut-out device ................................................................................................................................. 11
4.4.3 Temperature relief valve .......................................................................................................................... 11
4.4.4 Pressure relief/expansion valve ............................................................................................................ 11
4.4.5 Pressure reducing valve ............................................................................................................................ 11
4.4.6 Provision for expansion ............................................................................................................................. 12
4.4.7 Backflow prevention ................................................................................................................................... 12
5 Marking ............................................................................................................................................................ 12
6 Evaluation of conformity ........................................................................................................................... 12
6.1 General ............................................................................................................................................................. 12
6.1.1 Compliance testing ...................................................................................................................................... 12
6.1.2 Market surveillance .................................................................................................................................... 13
6.2 Initial type testing ........................................................................................................................................ 13
6.2.1 General ............................................................................................................................................................. 13
6.2.2 Actual volume ................................................................................................................................................ 13
6.2.3 Rated storage volume ................................................................................................................................. 13
6.2.4 Hot water volume ......................................................................................................................................... 13
6.2.5 Primary heating power (heat exchanger performance) ................................................................ 14
6.2.6 Durability testing ......................................................................................................................................... 14
6.2.7 Double-walled primary heaters .............................................................................................................. 14
6.2.8 Standing heat loss ........................................................................................................................................ 14
6.2.9 Pressure resistance ..................................................................................................................................... 14
6.2.10 Temperature control devices .................................................................................................................. 14
6.2.11 Heat exchanger pressure drop ................................................................................................................ 14
6.3 Production testing ....................................................................................................................................... 14
6.4 Factory production control (FPC) .......................................................................................................... 15
---------------------- Page: 4 ----------------------SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
7 Technical documents .................................................................................................................................. 15
7.1 General ............................................................................................................................................................. 15
7.2 Assembly and maintenance instructions ............................................................................................. 15
7.3 Operating instructions ................................................................................................................................ 16
Annex A (normative) Hot water safety and performance testing ............................................................ 17
A.1 Tests required ................................................................................................................................................ 17
A.2 Test apparatus and tolerances ................................................................................................................ 17
A.3 Performance tests ........................................................................................................................................ 19
A.4 Interpretation and calculation of hot water performance results ............................................. 21
A.5 Function of safety devices.......................................................................................................................... 22
Annex B (normative) Measurement of standing heat loss for factory insulated storage
water heaters ................................................................................................................................................. 23
B.1 General ............................................................................................................................................................. 23
B.2 Apparatus ........................................................................................................................................................ 23
B.3 Test Procedure .............................................................................................................................................. 25
B.4 Calculation of Results .................................................................................................................................. 26
Annex C (informative) Inspection access .......................................................................................................... 28
Annex ZA (informative) !Relationship between this European Standard and therequirements of Commission Delegated Regulation (EU) No 812/2013 of 18
February 2013 supplementing Directive 2010/30/EU regarding energy labelling of
water heaters, hot water storage tanks and packages of water heater and solar
device ................................................................................................................................................................ 30
Annex ZB (informative) !Relationship between this European Standard and therequirements of Commission Regulation (EU) No 814/2013 of 2 August 2013
implementing Directive 2009/125/EC with regard to ecodesign requirements for
water heaters and hot water storage tanks ........................................................................................ 32
Bibliography ................................................................................................................................................................. 34
---------------------- Page: 5 ----------------------SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
European foreword
This document (EN 12897:2016+A1:2020) 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 August 2020, and conflicting national standards
shall be withdrawn at the latest by August 2020.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 includes Amendment 1 approved by CEN on 2019-10-09.
This document supersedes !EN 12897:2016".
The start and finish of text introduced or altered by amendment is indicated in the text by tags !".
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 Commission Delegated
Regulation (EU) No 812/2013 and Commission Regulation (EU) No 814/2013.For relationship with EU Directives, see informative Annexes ZA and ZB which are an integral part of
this document.In comparison with EN 12897:2006, the following significant changes have been made:
— the capacity range extended from 1 000 l to 2 000 l;— the maximum temperature reduced from 100 °C to 95 °C;
— revisions in durability testing for cylinders using expansion vessels or internal expansion space;
— provision is made in Annex A for the calculation of the V hot water capacity;— Annex B has been revised to improve the test methodology and bring the standing heat loss test
requirements in line with those required by the EU directives for the Ecodesign and labelling of hot
water storage tanks.!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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom."---------------------- Page: 6 ----------------------
SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
Introduction
In respect of potential adverse effects on the quality of water intended for human consumption caused
by the product covered by this standard:a) This standard provides no information as to whether the product may be used without restriction
in any of the Member States of the EU or EFTA.b) It should be noted that, while awaiting the adoption of the verifiable European criteria, existing
national regulations concerning the use and/or the characteristics of this product remain in force.
---------------------- Page: 7 ----------------------SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
1 Scope
This document specifies the constructional and performance requirements and methods of test for
indirectly heated, unvented (closed) storage water heaters of up to 2 000 l volume suitable for
connection to a water supply at a pressure between 0,05 MPa and 1,0 MPa (0,5 bar and 10 bar), and
fitted with control and safety devices designed to prevent the temperature of the stored drinking water
from reaching 95 °C.Whilst storage water heaters intended primarily for direct heating are not covered by this document, it
does allow the provision of electric heating elements for auxiliary use.2 Normative references
!The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies."EN 1487, Building valves — Hydraulic safety groups — Tests and requirements
EN 1488, Building valves — Expansion groups — Tests and requirements
EN 1489, Building valves — Pressure safety valves — Tests and requirements
EN 1490, Building valves — Combined temperature and pressure relief valves — Tests and requirements
EN 1491, Building valves — Expansion valves — Tests and requirementsEN 1567, Building valves — Water pressure reducing valves and combination water pressure reducing
valves — Requirements and testsEN 1717, Protection against pollution of potable water in water installations and general requirements of
devices to prevent pollution by backflowEN 13203 (all parts), Gas-fired domestic appliances producing hot water
EN 13959, Anti-pollution check valves — DN 6 to DN 250 inclusive family E, type A, B, C and D
EN 15332:2007, Heating boilers — Energy assessment of hot water storage systemsEN 60379:2004, Methods for measuring the performance of electric storage water-heaters for household
purposes (IEC 60379:1987)EN 60730-2-9, Automatic electrical controls for household and similar use — Part 2-9: Particular
requirements for temperature sensing controls (IEC 60730-2-9)---------------------- Page: 8 ----------------------
SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
3 Terms, definitions and symbols
For the purposes of this document, the following terms, definitions and symbols apply.
!ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/• ISO Online browsing platform: available at http://www.iso.org/obp"
3.1 Terms and definitions
3.1.1
indirectly heated unvented (closed) storage water heater
vessel complete with heat exchanger (primary heater) for heating and storage of drinking water where
the contents are not vented to atmosphere3.1.2
rated volume
rated storage volume
volume of the water storage vessel in litres as specified in the manual
3.1.3
actual volume
measured volume of the drinking water storage vessel in litres
3.1.4
water side
part of the storage water heater directly in contact with the drinking water
3.1.5
heating side
parts of the storage water heater which contain the heating medium
3.1.6
maximum design pressure
rated pressure
maximum pressure to which the unvented storage water heater is designed to be subjected in use
3.1.7maximum inlet pressure
specified maximum cold water inlet pressure for the water heater
3.1.8
maximum safety temperature
maximum temperature that the stored water can reach under a fault condition
3.1.9
maximum operating temperature
maximum temperature that can be set for normal operation
3.1.10
primary heater
heat exchanger system fitted to the hot water storage vessel through which a heating medium (such as
water from a boiler) flows to heat the stored drinking water---------------------- Page: 9 ----------------------
SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
3.1.11
double-walled primary heater
primary heater with concentric walls such that any leak through one wall will not allow the heating
fluid to contaminate the drinking water3.2 Symbols
Symbol Unit Description
θ´p [ °C ] Average temperature of the water drawn off at ≥ (θc + 30) °C
V [l] Mixed water quantity delivered at 40 °C.
θc [ °C ] Average temperature of inlet cold water during the test
θ [ °C ] Target hot water temperature for hot water performance testing = θ
set c
+ 50 K
θpri [ °C ] Primary flow temperature = θc + 70 K
θ [ °C ] Target temperature of stored water for heat loss testing
e [ °C ] Mean of all the differentials between θ and measured ambient air
temperature
θa [ °C ] Measured ambient temperature at a given position
V [ l ] Volume of water drawn off at ≥ (θ + 30)°C
hot c
Qc [ kWh/24h ] Corrected 24 h heat loss
Q [ kWh/24h Declared standing heat loss
or W ]
Qm [ kWh ] Power consumption meter reading
t [ minutes ] Time taken to reheat the storage water heater from θc to θset
P [ kW ] Calculated heat exchanger performance
4 Requirements
4.1 Constructional requirements
4.1.1 Inspection access
Unvented storage water heaters shall be provided with means for internal inspection (see Annex C).
This can also be achieved by using a connection intended and dimensioned for another purpose where
the use of a suitable inspection instrument such as an endoscope is acceptable.4.1.2 Draining
Unvented storage water heaters shall permit in situ draining. The method of draining shall be given in
the manufacturer's instructions.4.1.3 Hydraulic connections
Hydraulic connections shall be of a type that allows the storage water heater to be disconnected from
the pipework.---------------------- Page: 10 ----------------------
SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
4.2 Temperature control
The temperature of the stored drinking water shall be regulated either by control of the heat source or
sources or by control of the water heater.4.3 Mechanical resistance and stability
4.3.1 Pressure resistance of water storage vessel
When tested in accordance with 6.2, the water heater shall withstand a pressure of 2,0 times the
maximum design pressure (as specified by the manufacturer) for a period of not less than 10 min
without showing any leakage or cracking.4.3.2 Pressure resistance of primary heater
When tested in accordance with 6.2, the primary heater or heaters shall withstand a pressure of 2,0
times the maximum design pressure, as specified by the manufacturer, for a period of not less than
10 min without showing any leakage or cracking.4.3.3 Durability
4.3.3.1 General
Water heaters shall be tested for durability by pressure cycle testing to either 4.3.3.2 or 4.3.3.3 as
appropriate. See Figure 2 for details. The storage water heater shall show no signs of leakage or
cracking after testing.For water heaters without inlet pressure and system expansion control and where the internal pressure
is likely to reach maximum design pressure due to water expansion after heat input, the test in 4.3.3.2
shall be applied.For water heaters designed for use with expansion vessels or internal expansion space such that the
rise in internal pressure due to expansion is controlled to below maximum design pressure, then the
alternative 4.3.3.3 shall be used.If 4.3.3.3 is used then the installation manual supplied with the water heater shall specify the pressure
reduction and expansion control devices required.4.3.3.2 Water heaters without inlet pressure and system expansion control
The water heater shall be subjected to either 20 000 periodic cycles at 1,2 × maximum design pressure
or 100 000 periodic cycles at 1,0 × maximum design pressure.4.3.3.3 Water heaters designed for use with expansion vessels or internal expansion space
For water heaters supplied for use with inlet pressure controls and expansion control systems and
these control systems are supplied with the water heater then the water heater shall be subjected to
either 20 000 periodic cycles at 1,5 × maximum inlet pressure or 100 000 periodic cycles at
1,3 × maximum inlet pressure. This procedure is illustrated by Figure 1.---------------------- Page: 11 ----------------------
SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
Key
Y pressure
X time
Figure 1 — Diagram of test pressure cycle variations
T ≥ 15 s ≤ 30 s
T ≥ 15 s ≤ 20 s
T ≥ 45 s ≤ 60 s
P = Minimum inlet pressure as defined in the technical documents or 0,1 MPa (1 bar) whichever is the
lower value.P = Test pressure as defined in 4.3.3.2 or 4.3.3.3 as appropriate.
Key
1 optional inlet pressure control with expansion valve (4.3.3.2)
2 mandatory inlet pressure control with external expansion vessel (4.3.3.3)
3 mandatory inlet pressure control with internal expansion space (4.3.3.3)
Figure 2 — Pressure control options
---------------------- Page: 12 ----------------------
SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
4.3.4 Leakage test on double-walled primary heater
When a water heater is provided with a double-walled primary heater, it shall be constructed such that
any leakage from the heating side shall be routed to outside the heat exchanger without coming into
contact with the stored drinking water.4.4 Safety equipment
4.4.1 General
Control and safety devices shall operate in the following sequence:
1) thermostatic control device;
2) energy cut out device;
3) where required, temperature pressure relief valve or safety relief valve.
Water heaters shall, where required, either be factory fitted, supplied with or fitted in accordance with
the manufacturer's instructions with all devices necessary for the operation of the water heater and the
prevention of contamination of the drinking water supply.All tests, unless specified within the test method, shall be carried out with all devices necessary to
control the temperature of the water and all devices necessary for the operation of the water heater and
the prevention of contamination of the drinking water supply, fitted.4.4.2 Energy cut-out device
Where required, water heaters shall be fitted with one or more non-self-resetting energy cut-outs
conforming to EN 60730-2-9 connected to the heat source to ensure that the heat input is interrupted in
the event of failure of the control thermostat and before the temperature of the stored water reaches
95 °C.4.4.3 Temperature relief valve
Where required, a temperature relief or a temperature and pressure relief valve shall conform to
EN 1490 and be positioned in the water heater so that it prevents the temperature of the stored water
from exceeding 100 °C.4.4.4 Pressure relief/expansion valve
Where required, water heaters shall be fitted, on the cold-water inlet, with either:
a) an expansion valve conforming to EN 1491,b) an expansion group conforming to EN 1488,
c) a pressure safety valve conforming to EN 1489, or
d) a hydraulic safety group conforming to EN 1487.
4.4.5 Pressure reducing valve
Where required, a pressure reducing valve conforming to EN 1567 shall be used.
---------------------- Page: 13 ----------------------
SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
4.4.6 Provision for expansion
Where it is a local requirement that expansion water is contained within the hot water system, water
heaters shall either:a) have an expansion capability within the storage vessel, or
b) be supplied with, or fitted in accordance with the manufacturer's instructions with an expansion
vessel.4.4.7 Backflow prevention
Where required, a protective device against backflow conforming to EN 1717 shall be used. If non-
return valves are used, they shall comply with EN 13959.5 Marking
Water heaters shall be permanently marked, by means of a plate or label to be visible after installation,
with, as a minimum, the following information:a) number and year of this standard, EN 12897:2016;
b) manufacturer's name, trademark or identification mark;
c) manufacturing number or serial number, indicating year of manufacture;
d) maximum design pressure on the drinking water side;
e) maximum design pressure on the heating side;
f) rated storage volume;
g) rated volume of the heat exchanger(s);
h) standing heat loss in kWh/24h or W.
In the case of water heaters that are incorporated into heating boilers, the characteristics of the storage
water heater and the heating boiler may be shown on a common rating plate or label.
6 Evaluation of conformity6.1 General
6.1.1 Compliance testing
The compliance of the product with the requirements o
...
SLOVENSKI STANDARD
SIST EN 12897:2016+A1:2020
01-april-2020
Oskrba z vodo - Specifikacija za posredno ogrevane neprezračevane (zaprte)
akumulacijske grelnike vode
Water supply - Specification for indirectly heated unvented (closed) storage water
heatersWasserversorgung - Bestimmung für mittelbar beheizte, unbelüftete (geschlossene)
Speicher-Wassererwärmer
Alimentation en eau - Prescriptions pour préparateurs d'eau chaude par accumulation à
chauffage indirect non ouverts à l'air libre (fermés)Ta slovenski standard je istoveten z: EN 12897:2016+A1:2020
ICS:
91.140.65 Oprema za ogrevanje vode Water heating equipment
SIST EN 12897:2016+A1:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------SIST EN 12897:2016+A1:2020
---------------------- Page: 2 ----------------------
SIST EN 12897:2016+A1:2020
EN 12897:2016+A1
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2020
EUROPÄISCHE NORM
ICS 91.140.65
English Version
Water supply - Specification for indirectly heated
unvented (closed) storage water heaters
Alimentation en eau - Prescriptions pour préparateurs Wasserversorgung - Bestimmung für mittelbar
d'eau chaude par accumulation à chauffage indirect beheizte, unbelüftete (geschlossene) Speicher-
non ouverts à l'air libre (fermés) WassererwärmerThis amendment A1 modifies the European Standard EN 12897:2016; it was approved by CEN on 9 October 2019.
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. 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 amendment 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, 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, Turkey and
United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12897:2016+A1:2020 E
worldwide for CEN national Members.---------------------- Page: 3 ----------------------
SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
Contents Page
European foreword ....................................................................................................................................................... 4
Introduction .................................................................................................................................................................... 5
1 Scope .................................................................................................................................................................... 6
2 Normative references .................................................................................................................................... 6
3 Terms, definitions and symbols ................................................................................................................. 7
3.1 Terms and definitions ................................................................................................................................... 7
3.2 Symbols ............................................................................................................................................................... 8
4 Requirements ................................................................................................................................................... 8
4.1 Constructional requirements ..................................................................................................................... 8
4.1.1 Inspection access ............................................................................................................................................. 8
4.1.2 Draining .............................................................................................................................................................. 8
4.1.3 Hydraulic connections ................................................................................................................................... 8
4.2 Temperature control ..................................................................................................................................... 9
4.3 Mechanical resistance and stability ......................................................................................................... 9
4.3.1 Pressure resistance of water storage vessel ......................................................................................... 9
4.3.2 Pressure resistance of primary heater.................................................................................................... 9
4.3.3 Durability ........................................................................................................................................................... 9
4.3.4 Leakage test on double-walled primary heater ................................................................................ 11
4.4 Safety equipment.......................................................................................................................................... 11
4.4.1 General ............................................................................................................................................................. 11
4.4.2 Energy cut-out device ................................................................................................................................. 11
4.4.3 Temperature relief valve .......................................................................................................................... 11
4.4.4 Pressure relief/expansion valve ............................................................................................................ 11
4.4.5 Pressure reducing valve ............................................................................................................................ 11
4.4.6 Provision for expansion ............................................................................................................................. 12
4.4.7 Backflow prevention ................................................................................................................................... 12
5 Marking ............................................................................................................................................................ 12
6 Evaluation of conformity ........................................................................................................................... 12
6.1 General ............................................................................................................................................................. 12
6.1.1 Compliance testing ...................................................................................................................................... 12
6.1.2 Market surveillance .................................................................................................................................... 13
6.2 Initial type testing ........................................................................................................................................ 13
6.2.1 General ............................................................................................................................................................. 13
6.2.2 Actual volume ................................................................................................................................................ 13
6.2.3 Rated storage volume ................................................................................................................................. 13
6.2.4 Hot water volume ......................................................................................................................................... 13
6.2.5 Primary heating power (heat exchanger performance) ................................................................ 14
6.2.6 Durability testing ......................................................................................................................................... 14
6.2.7 Double-walled primary heaters .............................................................................................................. 14
6.2.8 Standing heat loss ........................................................................................................................................ 14
6.2.9 Pressure resistance ..................................................................................................................................... 14
6.2.10 Temperature control devices .................................................................................................................. 14
6.2.11 Heat exchanger pressure drop ................................................................................................................ 14
6.3 Production testing ....................................................................................................................................... 14
6.4 Factory production control (FPC) .......................................................................................................... 15
---------------------- Page: 4 ----------------------SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
7 Technical documents .................................................................................................................................. 15
7.1 General ............................................................................................................................................................. 15
7.2 Assembly and maintenance instructions ............................................................................................. 15
7.3 Operating instructions ................................................................................................................................ 16
Annex A (normative) Hot water safety and performance testing ............................................................ 17
A.1 Tests required ................................................................................................................................................ 17
A.2 Test apparatus and tolerances ................................................................................................................ 17
A.3 Performance tests ........................................................................................................................................ 19
A.4 Interpretation and calculation of hot water performance results ............................................. 21
A.5 Function of safety devices.......................................................................................................................... 22
Annex B (normative) Measurement of standing heat loss for factory insulated storage
water heaters ................................................................................................................................................. 23
B.1 General ............................................................................................................................................................. 23
B.2 Apparatus ........................................................................................................................................................ 23
B.3 Test Procedure .............................................................................................................................................. 25
B.4 Calculation of Results .................................................................................................................................. 26
Annex C (informative) Inspection access .......................................................................................................... 28
Annex ZA (informative) !Relationship between this European Standard and therequirements of Commission Delegated Regulation (EU) No 812/2013 of 18
February 2013 supplementing Directive 2010/30/EU regarding energy labelling of
water heaters, hot water storage tanks and packages of water heater and solar
device ................................................................................................................................................................ 30
Annex ZB (informative) !Relationship between this European Standard and therequirements of Commission Regulation (EU) No 814/2013 of 2 August 2013
implementing Directive 2009/125/EC with regard to ecodesign requirements for
water heaters and hot water storage tanks ........................................................................................ 32
Bibliography ................................................................................................................................................................. 34
---------------------- Page: 5 ----------------------SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
European foreword
This document (EN 12897:2016+A1:2020) 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 August 2020, and conflicting national standards
shall be withdrawn at the latest by August 2020.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 includes Amendment 1 approved by CEN on 2019-10-09.
This document supersedes !EN 12897:2016".
The start and finish of text introduced or altered by amendment is indicated in the text by tags !".
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 Commission Delegated
Regulation (EU) No 812/2013 and Commission Regulation (EU) No 814/2013.For relationship with EU Directives, see informative Annexes ZA and ZB which are an integral part of
this document.In comparison with EN 12897:2006, the following significant changes have been made:
— the capacity range extended from 1 000 l to 2 000 l;— the maximum temperature reduced from 100 °C to 95 °C;
— revisions in durability testing for cylinders using expansion vessels or internal expansion space;
— provision is made in Annex A for the calculation of the V hot water capacity;— Annex B has been revised to improve the test methodology and bring the standing heat loss test
requirements in line with those required by the EU directives for the Ecodesign and labelling of hot
water storage tanks.!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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom."---------------------- Page: 6 ----------------------
SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
Introduction
In respect of potential adverse effects on the quality of water intended for human consumption caused
by the product covered by this standard:a) This standard provides no information as to whether the product may be used without restriction
in any of the Member States of the EU or EFTA.b) It should be noted that, while awaiting the adoption of the verifiable European criteria, existing
national regulations concerning the use and/or the characteristics of this product remain in force.
---------------------- Page: 7 ----------------------SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
1 Scope
This document specifies the constructional and performance requirements and methods of test for
indirectly heated, unvented (closed) storage water heaters of up to 2 000 l volume suitable for
connection to a water supply at a pressure between 0,05 MPa and 1,0 MPa (0,5 bar and 10 bar), and
fitted with control and safety devices designed to prevent the temperature of the stored drinking water
from reaching 95 °C.Whilst storage water heaters intended primarily for direct heating are not covered by this document, it
does allow the provision of electric heating elements for auxiliary use.2 Normative references
!The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies."EN 1487, Building valves — Hydraulic safety groups — Tests and requirements
EN 1488, Building valves — Expansion groups — Tests and requirements
EN 1489, Building valves — Pressure safety valves — Tests and requirements
EN 1490, Building valves — Combined temperature and pressure relief valves — Tests and requirements
EN 1491, Building valves — Expansion valves — Tests and requirementsEN 1567, Building valves — Water pressure reducing valves and combination water pressure reducing
valves — Requirements and testsEN 1717, Protection against pollution of potable water in water installations and general requirements of
devices to prevent pollution by backflowEN 13203 (all parts), Gas-fired domestic appliances producing hot water
EN 13959, Anti-pollution check valves — DN 6 to DN 250 inclusive family E, type A, B, C and D
EN 15332:2007, Heating boilers — Energy assessment of hot water storage systemsEN 60379:2004, Methods for measuring the performance of electric storage water-heaters for household
purposes (IEC 60379:1987)EN 60730-2-9, Automatic electrical controls for household and similar use — Part 2-9: Particular
requirements for temperature sensing controls (IEC 60730-2-9)---------------------- Page: 8 ----------------------
SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
3 Terms, definitions and symbols
For the purposes of this document, the following terms, definitions and symbols apply.
!ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/• ISO Online browsing platform: available at http://www.iso.org/obp"
3.1 Terms and definitions
3.1.1
indirectly heated unvented (closed) storage water heater
vessel complete with heat exchanger (primary heater) for heating and storage of drinking water where
the contents are not vented to atmosphere3.1.2
rated volume
rated storage volume
volume of the water storage vessel in litres as specified in the manual
3.1.3
actual volume
measured volume of the drinking water storage vessel in litres
3.1.4
water side
part of the storage water heater directly in contact with the drinking water
3.1.5
heating side
parts of the storage water heater which contain the heating medium
3.1.6
maximum design pressure
rated pressure
maximum pressure to which the unvented storage water heater is designed to be subjected in use
3.1.7maximum inlet pressure
specified maximum cold water inlet pressure for the water heater
3.1.8
maximum safety temperature
maximum temperature that the stored water can reach under a fault condition
3.1.9
maximum operating temperature
maximum temperature that can be set for normal operation
3.1.10
primary heater
heat exchanger system fitted to the hot water storage vessel through which a heating medium (such as
water from a boiler) flows to heat the stored drinking water---------------------- Page: 9 ----------------------
SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
3.1.11
double-walled primary heater
primary heater with concentric walls such that any leak through one wall will not allow the heating
fluid to contaminate the drinking water3.2 Symbols
Symbol Unit Description
θ´p [ °C ] Average temperature of the water drawn off at ≥ (θc + 30) °C
V [l] Mixed water quantity delivered at 40 °C.
θc [ °C ] Average temperature of inlet cold water during the test
θ [ °C ] Target hot water temperature for hot water performance testing = θ
set c
+ 50 K
θpri [ °C ] Primary flow temperature = θc + 70 K
θ [ °C ] Target temperature of stored water for heat loss testing
e [ °C ] Mean of all the differentials between θ and measured ambient air
temperature
θa [ °C ] Measured ambient temperature at a given position
V [ l ] Volume of water drawn off at ≥ (θ + 30)°C
hot c
Qc [ kWh/24h ] Corrected 24 h heat loss
Q [ kWh/24h Declared standing heat loss
or W ]
Qm [ kWh ] Power consumption meter reading
t [ minutes ] Time taken to reheat the storage water heater from θc to θset
P [ kW ] Calculated heat exchanger performance
4 Requirements
4.1 Constructional requirements
4.1.1 Inspection access
Unvented storage water heaters shall be provided with means for internal inspection (see Annex C).
This can also be achieved by using a connection intended and dimensioned for another purpose where
the use of a suitable inspection instrument such as an endoscope is acceptable.4.1.2 Draining
Unvented storage water heaters shall permit in situ draining. The method of draining shall be given in
the manufacturer's instructions.4.1.3 Hydraulic connections
Hydraulic connections shall be of a type that allows the storage water heater to be disconnected from
the pipework.---------------------- Page: 10 ----------------------
SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
4.2 Temperature control
The temperature of the stored drinking water shall be regulated either by control of the heat source or
sources or by control of the water heater.4.3 Mechanical resistance and stability
4.3.1 Pressure resistance of water storage vessel
When tested in accordance with 6.2, the water heater shall withstand a pressure of 2,0 times the
maximum design pressure (as specified by the manufacturer) for a period of not less than 10 min
without showing any leakage or cracking.4.3.2 Pressure resistance of primary heater
When tested in accordance with 6.2, the primary heater or heaters shall withstand a pressure of 2,0
times the maximum design pressure, as specified by the manufacturer, for a period of not less than
10 min without showing any leakage or cracking.4.3.3 Durability
4.3.3.1 General
Water heaters shall be tested for durability by pressure cycle testing to either 4.3.3.2 or 4.3.3.3 as
appropriate. See Figure 2 for details. The storage water heater shall show no signs of leakage or
cracking after testing.For water heaters without inlet pressure and system expansion control and where the internal pressure
is likely to reach maximum design pressure due to water expansion after heat input, the test in 4.3.3.2
shall be applied.For water heaters designed for use with expansion vessels or internal expansion space such that the
rise in internal pressure due to expansion is controlled to below maximum design pressure, then the
alternative 4.3.3.3 shall be used.If 4.3.3.3 is used then the installation manual supplied with the water heater shall specify the pressure
reduction and expansion control devices required.4.3.3.2 Water heaters without inlet pressure and system expansion control
The water heater shall be subjected to either 20 000 periodic cycles at 1,2 × maximum design pressure
or 100 000 periodic cycles at 1,0 × maximum design pressure.4.3.3.3 Water heaters designed for use with expansion vessels or internal expansion space
For water heaters supplied for use with inlet pressure controls and expansion control systems and
these control systems are supplied with the water heater then the water heater shall be subjected to
either 20 000 periodic cycles at 1,5 × maximum inlet pressure or 100 000 periodic cycles at
1,3 × maximum inlet pressure. This procedure is illustrated by Figure 1.---------------------- Page: 11 ----------------------
SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
Key
Y pressure
X time
Figure 1 — Diagram of test pressure cycle variations
T ≥ 15 s ≤ 30 s
T ≥ 15 s ≤ 20 s
T ≥ 45 s ≤ 60 s
P = Minimum inlet pressure as defined in the technical documents or 0,1 MPa (1 bar) whichever is the
lower value.P = Test pressure as defined in 4.3.3.2 or 4.3.3.3 as appropriate.
Key
1 optional inlet pressure control with expansion valve (4.3.3.2)
2 mandatory inlet pressure control with external expansion vessel (4.3.3.3)
3 mandatory inlet pressure control with internal expansion space (4.3.3.3)
Figure 2 — Pressure control options
---------------------- Page: 12 ----------------------
SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
4.3.4 Leakage test on double-walled primary heater
When a water heater is provided with a double-walled primary heater, it shall be constructed such that
any leakage from the heating side shall be routed to outside the heat exchanger without coming into
contact with the stored drinking water.4.4 Safety equipment
4.4.1 General
Control and safety devices shall operate in the following sequence:
1) thermostatic control device;
2) energy cut out device;
3) where required, temperature pressure relief valve or safety relief valve.
Water heaters shall, where required, either be factory fitted, supplied with or fitted in accordance with
the manufacturer's instructions with all devices necessary for the operation of the water heater and the
prevention of contamination of the drinking water supply.All tests, unless specified within the test method, shall be carried out with all devices necessary to
control the temperature of the water and all devices necessary for the operation of the water heater and
the prevention of contamination of the drinking water supply, fitted.4.4.2 Energy cut-out device
Where required, water heaters shall be fitted with one or more non-self-resetting energy cut-outs
conforming to EN 60730-2-9 connected to the heat source to ensure that the heat input is interrupted in
the event of failure of the control thermostat and before the temperature of the stored water reaches
95 °C.4.4.3 Temperature relief valve
Where required, a temperature relief or a temperature and pressure relief valve shall conform to
EN 1490 and be positioned in the water heater so that it prevents the temperature of the stored water
from exceeding 100 °C.4.4.4 Pressure relief/expansion valve
Where required, water heaters shall be fitted, on the cold-water inlet, with either:
a) an expansion valve conforming to EN 1491,b) an expansion group conforming to EN 1488,
c) a pressure safety valve conforming to EN 1489, or
d) a hydraulic safety group conforming to EN 1487.
4.4.5 Pressure reducing valve
Where required, a pressure reducing valve conforming to EN 1567 shall be used.
---------------------- Page: 13 ----------------------
SIST EN 12897:2016+A1:2020
EN 12897:2016+A1:2020 (E)
4.4.6 Provision for expansion
Where it is a local requirement that expansion water is contained within the hot water system, water
heaters shall either:a) have an expansion capability within the storage vessel, or
b) be supplied with, or fitted in accordance with the manufacturer's instructions with an expansion
vessel.4.4.7 Backflow prevention
Where required, a protective device against backflow conforming to EN 1717 shall be used. If non-
return valves are used, they shall comply with EN 13959.5 Marking
Water heaters shall be permanently marked, by means of a plate or label to be visible after installation,
with, as a minimum, the following information:a) number and year of this standard, EN 12897:2016;
b) manufacturer's name, trademark or identification mark;
c) manufacturing number or serial number, indicating year of manufacture;
d) maximum design pressure on the drinking water side;
e) maximum design pressure on the heating side;
f) rated storage volume;
g) rated volume of the heat exchanger(s);
h) standing heat loss in kWh/24h or W.
In the case of water heaters that are incorporated into heating boilers, the characteristics of the storage
water heater and the heating boiler may be shown on a common rating plate or label.
6 Evaluation of conformity6.1 General
6.1.1 Compliance testing
The compliance of the product with the requirements of this European Standard and w
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.