EN    EN COMMISSION REGULATION (EU) No …/.. 
of XXX 
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 
(Text with EEA relevance) 
THE EUROPEAN COMMISSION, 
Having regard to the Treaty on the Functioning of the European Union, Having regard to Directive 2009/125/EC of the Eu ropean Parliament and of the Council of 21 
October 2009 establishing a framework for th e setting of ecodesign requirements for energy-
related products
1 and in particular Article 15(1) thereof, 
After consulting the Ecodes ign Consultation Forum, 
Whereas: (1) Under Directive 2009/125/EC ecodesign requirements should be set by the 
Commission for energy-related products re presenting significant vo lumes of sales and 
trade, having a significant environmental impact and presenting significant potential 
for improvement through design in terms of  their environmenta l impact, without 
entailing excessive costs. 
(2) Article 16(2)(a) of Directive 2009/125/EC provides that, in a ccordance with the 
procedure referred to in Article 19(3) and the criteria set out in Article 15(2), and after consulting the Ecodesign Consultation Foru m, the Commission should, as appropriate, 
introduce implementing measures for produc ts offering a high po tential for cost-
effective reduction of greenhouse gas emissions , such as for water heating equipment. 
(3) The Commission has carried out  a preparatory study on the technical, environmental 
and economic aspects of water heaters and hot  water storage tanks typically used in 
the domestic and commercial sector. The study was devised together with stakeholders 
and interested parties from the Union and th ird countries, and the results have been 
made publicly available. 
(4) The environmental aspects of water heaters th at have been identified as significant for 
the purposes of this Regulation are energy c onsumption in the use phase and (for heat 
pump water heaters) sound power levels. In  addition, for water heaters using fossil 
fuels, emissions of nitrogen oxides, carbon monoxide and hydrocarbons are also 
                                                
 
1 OJ L 285, 31.10.2009, p. 10.  
EN    EN identified as significant environmental aspe cts. The significant environmental aspect 
of hot water storage tanks is energy c onsumption due to their standing losses. 
(5) It is not appropriate to set ecodesign requirements for emissions of carbon monoxide 
and hydrocarbons as no suitable European meas urement methods are as yet available. 
With a view to developing such measur ement methods, the Commission mandated the 
European standardisation bodies to cons ider ecodesign requirements for those 
emissions during the review of this Re gulation. National provisions for ecodesign 
requirements on emissions of carbon monoxi des and hydrocarbons of water heaters 
may be maintained until the corresponding Union ecodesign requirements enter into 
force. The provisions of Dir ective 2009/142/EC of the Europe an Parliament and of the 
Council of 30 November 2009 relating to  appliances burning gaseous fuels2, which 
limit the combustion products of appliances burning gaseous fu els in relation to health 
and safety, are not affected. 
(6) The preparatory study shows that requir ements regarding the other ecodesign 
parameters referred to in Annex I, Part 1 to Directive 2009/125/EC are not necessary 
in the case of water heaters and hot water storage tanks. In particular, greenhouse gas 
emissions related to refrigerants used in h eat pump water heater s for heating today’s 
European building stock are not identified as significant. The appropriateness of 
setting ecodesign requirements for these gr eenhouse gas emissions will be reassessed 
when reviewing this Regulation. 
(7) The scope of this Regulation should be limited to water heaters which are dedicated to 
providing hot drinking and sanitary water. 
(8) Depending on the outcome of further technica l, economic and environmental analyses, 
ecodesign requirements for water heaters speci fically designed for using biomass fuels 
or solid fossil fuels should be set at a later stage, if appropriate. 
(9) Annual energy consumption related to water heaters and hot water storage tanks was 
estimated to have been 2  156 PJ (51 Mtoe) in the Uni on in 2005, corr esponding to 124 
Mt CO 2 emissions. Unless specific measures ar e taken, annual energy consumption is 
expected to be 2  243 PJ in 2020. Annual emissions of nitrogen oxides related to water 
heaters and hot water storage tanks we re estimated to have been 559 kt SO x equivalent 
in the Union in 2005. Unless specific m easures are taken, annual emissions are 
expected to be 603 kt SO x equivalent in 2020. The prep aratory study shows that the 
use-phase energy consumption and the nitroge n oxides emissions of water heaters can 
be significantly reduced. 
(10) The energy consumption of water heaters a nd hot water storage tanks can be reduced 
by applying existing cost-effective non-propr ietary technologies which lead to a 
reduction in the combined costs of purchasing and operating these products. 
(11) The combined effect of the ecodesign requi rements set out in th is Regulation and the 
Commission Delegated Regul ation (EU) No … of … supplementing Directive 
2010/30/EU of the European Parliament and of the Council with regard to energy 
labelling of water heaters, hot water storage tanks and packages of water heater and 
                                                 
2 OJ L 330, 16.12.2009, p. 10.  
EN    EN solar device [Number of the Regulation and OJ reference in foot note to be inserted 
before publication in the OJ] is expected to  result in estimated annual energy savings 
of about 450 PJ (11 Mtoe),  corresponding to around 26 Mt CO 2 emissions, and a 
reduction in annual nitrogen oxide s emissions of some 130 kt SO x equivalent by 2020, 
compared to what would happen if no measures were taken. 
(12) Ecodesign requirements shoul d harmonise energy consum ption, sound power level 
and nitrogen oxides emission requirements for water heaters, and requirements for 
standing losses of hot water storage tanks throughout the Union, thus helping to make 
the internal market operate better and to  improve the environmental performance of 
these products. 
(13) The ecodesign requirements should not affect the functionality or affordability of 
water heaters or hot water st orage tanks from the end-us er’s perspective and should 
not negatively affect health, safety or the environment. 
(14) The ecodesign requirements should be introduc ed gradually to give manufacturers a 
sufficient timeframe to redesi gn their products s ubject to this Regulation. The timing 
should be such that cost impact for manufact urers, in particular for small and medium-
sized enterprises, is taken into account, while ensuring timely achievement of the 
objectives of this Regulation. 
(15) Product parameters should be measured and calculated using reliable, accurate and 
reproducible methods which take into account  recognised state-of-the-art measurement 
and calculation methods, including, where avai lable, harmonised standards adopted by 
the European standardisation bodies under a request from the Commission, in accordance with the procedures laid down in the Directive 98/34/EC of the European Parliament and of the Council of 22 June  1998 laying down a procedure for the 
provision of information in th e field of technical standards and regulations and of rules 
on Information Society services
3. 
(16) In accordance with Article 8(2) of Direct ive 2009/125/EC, this Regulation specifies 
which conformity assessment procedures apply. 
(17) To facilitate compliance checks, manufactur ers should provide information in the 
technical documentation referred to in A nnexes IV and V to Directive 2009/125/EC 
insofar as that information relates to the requirements laid down in this Regulation. 
(18) To further limit the environmental impact of  water heaters and hot water storage tanks, 
manufacturers should provide information on disassembly, recycling and/or disposal. 
(19) In addition to the legally bindi ng requirements laid down in  this Regulation, indicative 
benchmarks for best available technologies  should be identified to ensure that 
information on the life-cycle environmental performance of water heaters and hot water storage tanks is widely available and easily accessible. 
(20) The measures provided for in this Regulati on are in accordance with the opinion of the 
Committee established by Article 19(1) of Directive 2009/125/EC, 
                                                
 
3 OJ L 204, 21.7.1998, p. 37.  
EN    EN HAS ADOPTED THIS REGULATION: 
Article 1 
Subject matter and scope 
1. This Regulation establishes ecodesign re quirements for the placing on the market 
and/or putting into serv ice of water heaters with a rated heat output ≤ 400 kW and 
hot water storage tanks with a storage volume ≤ 2 000 litres. 
2. This Regulation shall not apply to: 
(a) water heaters specifically designed fo r using predominantly biomass fuels; 
(b) water heaters using solid fuels; (c) water heaters within the scope of  Directive 2010/75/EU of the European 
Parliament and of the Council
4; 
(d) combination heaters as defined in Article 2 of Commission Regulation (EU) 
No …/…. [Number of the heater ecode sign Regulation and OJ reference in 
footnote to be inserted before publication in the OJ]; 
(e) water heaters which do not meet at l east the load profile with the smallest 
reference energy, as specified in Annex III, Table 1; 
(f) water heaters designed for maki ng hot drinks and/or food only; 
(g) heat generators designed for water h eaters and water heater housings to be 
equipped with such heat generators pl aced on the market before 1 January 2018 
to replace identical heat generators a nd identical water heater housings. The 
replacement product or its packaging shall clearly indicate the water heater for 
which it is intended. 
Article 2 
Definitions 
In addition to the definitions  set out in Article 2 of Di rective 2009/125/EC, the following 
definitions shall apply: 
(1) ‘water heater’ means a device that 
(a) is connected to an external suppl y of drinking or sanitary water; 
(b) generates and transfers heat to deliver dr inking or sanitary hot water at given 
temperature levels, quantities and fl ow rates during given intervals; 
(c) is equipped with one or more heat generators; and 
                                                 
4 OJ L 334, 17.12.2010, p. 17.  
EN    EN (d) may be equipped with one or more hot water storage tanks; 
(2) ‘heat generator’ means the part of a water he ater that generates the heat using one or 
more of the following processes: 
(a) combustion of fossil fuels and/or biomass fuels; 
(b) use of the Joule effect in elec tric resistance heating elements; 
(c) capture of ambient heat from an air source, water source or ground source, 
and/or waste heat; 
whereby a heat generator designed for a wa ter heater and a water heater housing to 
be equipped with such a heat generator sh all be also considered a water heater; 
(3) ‘rated heat output’ means the declared he at output of the water heater when 
providing water heating at standard rating conditions, expressed in kW; 
(4) ‘storage volume’ ( V) means the rated volume of a hot water storage tank or a storage 
water heater, expressed in litres; 
(5) ‘standard rating conditions ’ means the operating conditions of water heaters for 
establishing the rated heat output, water he ating energy efficiency, sound power level 
and nitrogen oxide emissions, and of hot water storage ta nks for establishing the 
standing loss; 
(6) ‘biomass’ means the biodegradable fracti on of products, waste and residues from 
biological origin from agriculture (including vegetal and animal substances), forestry 
and related industries including fisher ies and aquaculture , as well as the 
biodegradable fraction of indus trial and municipal waste; 
(7) ‘biomass fuel’ means a gaseous or li quid fuel produced from biomass; 
(8) ‘fossil fuel’ means a gaseous or  liquid fuel of fossil origin; 
(9) ‘conventional water heater’ means a water heater that generates heat using the 
combustion of fossil and/or biomass fuels and/or the Joule effect in electric 
resistance heating elements; 
(10) ‘heat pump water heater’ means a water h eater using ambient heat from an air 
source, water source or ground source, and/ or waste heat for heat generation; 
(11) ‘solar water heater’ means a water heater e quipped with one or mo re solar collectors, 
solar hot water storage tanks, heat genera tors and possibly pumps in the collector 
loop and other parts; a solar water heat er is placed on the market as one unit; 
(12) ‘hot water storage tank’ means a vessel for storing hot water for water and/or space 
heating purposes, including any additives; a hot water storage tank may be equipped 
with a means for indirect heating of the water content by an external heat source or by district heating, but is not equipped with any heat generator except possibly one or 
more back-up immersion heaters; a solar hot  water storage tank is  a hot water storage 
tank;  
EN    EN (13) ‘district heating’ means the distribution of thermal energy in the form of steam or hot 
water, from a central source of production th rough a network to multiple buildings or 
sites, for the use of space and/or water heating; 
(14) ‘back-up immersion heater’ means a Joule effect electric resistance h eater that is part 
of a hot water storage tank and generates heat only when the external heat source is disrupted (including during maintenance periods) or out of order, or that is part of a 
solar hot water storage tank, is located in the middle of the storage volume or above, 
and provides heat when the solar heat s ource is not sufficient to satisfy required 
comfort levels; 
(15) ‘water heating energy efficiency’ ( η
wh) means the ratio between the useful energy 
provided by a water heater and the energy required for its generation, expressed in 
%; 
(16) ‘sound power level’ ( LWA) means the A-weighted sound power level, indoors and/or 
outdoors, expressed in dB; 
(17) ‘standing loss’ ( S) means the heating power dissipated  from a hot water storage tank 
at given water and ambient temperatures, expressed in W; 
(18) ‘conversion coefficient’ ( CC) means a coefficient reflecting the estimated 40  % 
average EU generation efficiency referr ed to in Directiv e 2006/32/EC of the 
European Parliament and of the Council5; the value of the conversion coefficient is 
CC = 2,5. 
For Annexes II to VI, additional defi nitions are set out in Annex I. 
Article 3 
Ecodesign requirements and timetable 
1. The ecodesign requirements for water heaters and hot water storage tanks are set out 
in Annex II. 
2. Each ecodesign requirements shall apply in accordance with the following timetable: 
(a)  from [date to be inserted: two years after this Regulation has entered into 
force]: 
(i) water heaters shall meet the requi rements set out in Annex II, points 
1.1(a), 1.2, 1.3, 1.4 and 1.6; 
(ii) hot water storage tanks shall meet  the requirements set out in Annex II, 
point 2.2; 
(b)  from [date to be inserted: three years after this Regulation has entered into 
force] conventional water h eaters shall meet the requi rements set out in Annex 
II, point 1.5(a); 
                                                 
5 OJ L 114, 27.4.2006, p. 64.  
EN    EN (c) from [date to be inserted: four years after this Regulation has entered into 
force]: 
(i) water heaters shall meet the requ irements set out in Annex II, point 
1.1(b); 
(ii) hot water storage tanks shall meet  the requirements set out in Annex II, 
point 2.1; 
(d) from [date to be inserted: five years after this Regulation has entered into 
force]: 
(i) water heaters shall meet the requ irements set out in Annex II, point 
1.1(c); 
(ii) heat pump water heaters and so lar water heaters shall meet the 
requirements set out in Annex II, point 1.5(b). 
3. Compliance with ecodesign requirements shall be measured and calculated in 
accordance with the requirements se t out in Annex III and Annex IV. 
Article 4 
Conformity assessment 
1. The conformity assessment procedure referred to in Article 8(2) of Directive 
2009/125/EC shall be the internal design co ntrol set out in Annex IV to that 
Directive or the management system se t out in Annex V to  that Directive. 
2. For the purposes of conformity assessment, the technical documentation shall contain 
the product information set out in point  1.6 of Annex II to this Regulation. 
Article 5 
Verification procedure for market surveillance purposes 
When performing the market surveillance checks  referred to in Article 3(2) of Directive 
2009/125/EC to ensure compliance with the re quirements set out in  Annex II to this 
Regulation, the Member States’ authorities shal l apply the verification procedure set out in 
Annex V to this Regulation. 
Article 6 
Indicative Benchmarks 
The indicative benchmarks for best-performi ng water heaters and hot water storage tanks 
available on the market at the time of entry into  force of this Regulation are set out in Annex 
VI.  
EN    EN Article 7 
Review 
The Commission shall review this Regulation in the light of technological progress with water 
heaters and hot water storage tanks and present the result of that review to the Ecodesign 
Consultation Forum no later than five years from the date of entry into force of this Regulation. In particular, the review shall incl ude an assessment of the following aspects: 
(a) the appropriateness of setting ecodesign requirements for greenhouse gas emissions 
related to refrigerants; 
(b) on the basis of the measurement methods under development, the level of the 
ecodesign requirements for emissions of  carbon monoxide and hydrocarbons that 
may be introduced; 
(c) the appropriateness of setting stricter ecodesign requirements for emissions of 
nitrogen oxides; 
(d) the appropriateness of setting ecodesign re quirements for water heaters specifically 
designed for using predominantly biomass fuels; 
(e) the validity of the conversion coefficient value. 
Article 8 
Transitional provisions 
1. Until [date to be inserted: two years after this Regulation has entered into force] 
Member States may allow the placing on the market and/or putting into service of 
water heaters which are in conformity with the national provisions in force when this Regulation is adopted regarding water he ating energy efficiency and sound power 
level. 
2. Until [date to be inserted: three years after this Regulation has entered into force] 
Member States may allow the placing on the market and/or putting into service of 
conventional water heaters wh ich are in conformity with  the national provisions in 
force when this Regulation is adopted re garding emissions of nitrogen oxides. 
3. Until [date to be inserted: five years afte r this Regulation has entered into force] 
Member States may allow the placing on the market and/or putting into service of 
heat pump water heaters and solar water he aters which are in conformity with the 
national provisions in force when this Re gulation is adopted regarding emissions of 
nitrogen oxides. 
4. Until [date to be inserted: four years after this Regulation has entered into force] 
Member States may allow the placing on the market and/or putting into service of 
hot water storage tanks, which are in confor mity with the national provisions in force 
upon adoption of this Regulati on regarding standing losses.  
EN    EN Article 9 
Entry into force 
This Regulation shall enter into force on the twentieth day following that of its publication in 
the Official Journal of  the European Union . 
This Regulation shall be binding in  its entirety and directly applicable in all Member States. 
Done at Brussels,  
 For the Commission 
 The President 
 José Manuel BARROSO   
EN 9   EN ANNEX I 
Definitions applicable for Annexes II to VI 
For Annexes II to VI the following definitions shall apply: 
(1) ‘storage water heater’ means a water heater equipped with hot water storage tank(s), heat 
generator(s) and possibly other parts, which are contained in a single housing; 
(2) ‘load profile’ means a given sequence of wate r draw-offs, as specified in Annex III, Table 
1; 
(3) ‘water draw-off’ means a given combination of useful water flow rate, useful water 
temperature, useful energy content and peak te mperature, as specified in Annex III, Table 
1; 
(4) ‘useful water flow rate’ ( f) means the minimum flow rate, expressed in litres per minute, 
for which hot water is contributing to the reference energy, as specified in Annex III, Table 1; 
(5) ‘useful water temperature’ ( T
m), means the water temperature, expressed in degrees 
Celsius, at which hot water starts contribu ting to the reference en ergy, as specified in 
Annex III, Table 1; 
(6) ‘useful energy content’ ( Qtap) means the energy content of hot water, expressed in kWh, 
provided at a temperature equal to, or above, the useful wate r temperature, and at water 
flow rates equal to, or above, the useful water flow rate, as specified in Annex III, Table 1; 
(7) ‘energy content of hot water’ means the product of the specific heat capacity of water, the 
average temperature difference between the co ld water input and hot water output, and the 
total mass of the hot water delivered; 
(8) ‘peak temperature’ ( Tp) means the minimum water temperature, expressed in degrees 
Celsius, to be achieved during water draw-o ff, as specified in Annex III, Table 1; 
(9) ‘reference energy’ ( Qref) means the sum of the useful en ergy content of water draw-offs, 
expressed in kWh, in a particular load pr ofile, as specified in Annex III, Table 1; 
(10) ‘maximum load profile’ means the load profil e with the greatest reference energy that a 
water heater is able to provi de while fulfilling the temperatur e and flow rate conditions of 
that load profile; 
(11) ‘declared load profile’ mean s the load profile applied for conformity assessment; 
(12) ‘daily electricity consumption’ ( Qelec) means the consumption of  electricity over 24 
consecutive hours under the declared load pr ofile, expressed in kWh in terms of final 
energy; 
(13) ‘daily fuel consumption’ ( Qfuel) means the consumption of fuels over 24 consecutive hours 
under the declared load profile, expressed in kWh in terms of GCV ; 
(14) ‘gross calorific value’ ( GCV ) means the total amount of heat released by a unit quantity of 
fuel when it is burned co mpletely with oxygen and when the products of combustion are  
EN 10   EN returned to ambient temperatur e; this quantity incl udes the condensation heat of any water 
vapour contained in the fuel and of the wa ter vapour formed by the combustion of any 
hydrogen contained in the fuel; 
(15) ‘smart control’ means a device that automatically adapts the water heating process to 
individual usage conditions with the aim of reducing energy consumption; 
(16) ‘smart control compliance’ ( smart ) means the measure of whet her a water heater equipped 
with smart controls fulfils the criter ion set out in point  4 of Annex IV; 
(17) ‘smart control factor’ ( SCF) means the water heating energy efficiency gain due to smart 
control under the conditions set out in point 3 of Annex III; 
(18) ‘weekly electricity consumption with smart controls’ ( Qelec,week,smart ) means the weekly 
electricity consumption of a water heater  with the smart control function enabled, 
measured under the conditions set out in point  3 of Annex III, expressed in kWh in terms 
of final energy; 
(19) ‘weekly fuel consumption with smart controls’ ( Qfuel,week,smart ) means the weekly fuel 
consumption of a water heater with the smar t control function enabled, measured under the 
conditions set out in point 3 of Annex III, expressed in kWh in terms of GCV ; 
(20) ‘weekly electricity consumption without smart controls’ ( Qelec,week ) means the weekly 
electricity consumption of a water heater with the smart control function disabled, 
measured under the conditions set out in point  3 of Annex III, expressed in kWh in terms 
of final energy; 
(21) ‘weekly fuel consumption without smart controls’ ( Qfuel,week ) means the weekly fuel 
consumption of a water heater with the sm art control function disabled, measured under 
the conditions set out in point 3 of A nnex III, expressed in kWh in terms of GCV ; 
(22) ‘ambient correction term’ ( Qcor) means a term which takes into  account the fact that the 
place where the water heater is installed is not an isothermal place, expressed in kWh; 
(23) ‘standby heat loss’ ( Pstby) means the heat loss of a heat pump water heater in operating 
modes without heat demand, expressed in kW; 
(24) ‘mixed water at 40  °C’ ( V40) means the quantity of water at 40  °C, which has the same heat 
content (enthalpy) as the hot wa ter which is delivered above 40  °C at the output of the 
water heater, expressed in litres; 
(25) ‘average climate conditions’ mean the temperature and global solar irradiance conditions 
characteristic for the city of Strasbourg; 
(26) ‘annual energy consumption’ ( Qtota) means the annual energy consumption of a solar water 
heater, expressed in kWh in terms of primary energy and/or kWh in terms of GCV ; 
(27) ‘annual non-solar heat  contribution’ ( Qnonsol) means the annual contribution of electricity 
(expressed in kWh in terms of primary energy) and/or fuel (expressed in kWh in terms of 
GCV ) to the useful heat output of a solar water heater, ta king into account the annual 
amount of heat captured by the solar collector and the heat losses of the solar hot water 
storage tank;  
EN 11   EN (28) ‘solar collector’ means a device designed to ab sorb global solar irradiance and to transfer 
the heat energy so produced to a fluid passing through it; it is  characterised by the collector 
aperture area, the zero-load efficiency, the first order co efficient, the second order 
coefficient and the incidence angle modifier; 
(29) ‘global solar irradiance’ mean s the rate of total incoming solar energy, both direct and 
diffuse, on a collector plane with an inclinati on of 45 degrees and southward orientation at 
the Earth’s surface, expressed in W/m²; 
(30) ‘collector aperture area’ ( Asol) means the maximum project ed area through which 
unconcentrated solar radiation enters  the collector, expressed in m²; 
(31) ‘zero-load efficiency’ ( η0) means the efficiency of the solar collector, when the solar 
collector mean fluid temperature is equal to the ambient temperature; 
(32) ‘first order coefficient’ ( a1) means the heat loss coefficient of a solar collector, expressed 
in W/(m² K); 
(33) ‘second order coefficient’ ( a2) means the coefficient measuring the temperature 
dependence of the first order coeffi cient, expressed in W/(m² K²);  
(34) ‘incidence angle modifier’ ( IAM) means the ratio of the usef ul heat output of a solar 
collector at a given incidence an gle and its useful heat output at an incidence angle of 90 
degrees; 
(35) ‘incidence angle’ means the an gle between the direction to  the sun and the direction 
perpendicular to the so lar collector aperture; 
(36) ‘heat generator water heating energy efficiency’ ( ηwh,nonsol ) means the water heating energy 
efficiency of a heat generator which is part  of a solar water heater, expressed in %, 
established under average climate conditions  and without using solar heat input; 
(37) ‘auxiliary electricity consumption’ ( Qaux) means the annual electricity consumption of a 
solar water heater that is due to the pu mp power consumption and the standby power 
consumption, expressed in kWh in terms of final energy; 
(38) ‘pump power consumption’ ( solpump ) means the rated electrical power consumption of the 
pump in the collector loop of a so lar water heater, expressed in W; 
(39) ‘standby power consumption’ ( solstandby ) means the rated electrical power consumption 
of a solar water heater when the pump and th e heat generator of a solar water heater are 
inactive, expressed in W.  
EN 12   EN ANNEX II 
Ecodesign requirements 
1. Ecodesign requirements for water heaters 
1.1. Requirements for water heating energy efficiency 
(a) From [date to be inserted: two years after this Regulation has entered into force] the 
water heating energy efficiency of water heaters shall not fall below the following values: 
Declared load profile 3XS XXS XS S M L XL XXL 3XL 4XL
Water heating energy 
efficiency 22 % 23  %2 6  %2 6  %3 0  %3 0  %3 0  % 32  % 32  %3 2  %
In addition, for water 
heaters with smart  being 
declared as ‘1’: water 
heating energy efficiency 
calculated for smart  = 0, 
tested under the 24-hour 
tapping cycle and the 
declared load profile 19 % 20  %2 3  %2 3  %2 7  %2 7  %2 7  % 28  % 28  %2 8  %
(b) From [date to be inserted: four years after this Regulation has entered into force] the 
water heating energy efficiency of water heaters shall not fall below the following values: 
Declared load profile 3XS XXS XS S M L XL XXL 3XL 4XL
Water heating energy 
efficiency 32 % 32  %3 2  %3 2  %3 6  %3 7  %3 8  % 40  % 40  %4 0  %
In addition, for water 
heaters with smart  being 
declared as ‘1’: water 
heating energy efficiency 
calculated for smart  = 0, 
tested under the 24-hour 
tapping cycle and the 
declared load profile 29 % 29  %2 9  %2 9  %3 3  %3 4  %3 5  % 36  % 36  %3 6  %
(c) From [date to be inserted: five years after this Regulation has entered into force] the 
water heating energy efficiency of water heaters shall not fall below the following values: 
Declared load profile XXL 3XL 4XL 
Water heating energy 
efficiency 60 % 64  % 64  % 
1.2. Requirements for storage volume of storage wate r heaters with declared load profiles 3XS, 
XXS, XS and S 
From [date to be inserted: two years afte r this Regulation has entered into force]:  
EN 13   EN (a) for storage water heaters with  declared load profile 3XS the storage volume shall not 
exceed 7 litres; 
(b) for storage water heaters with declared  load profiles XXS and XS, the storage 
volume shall not exceed 15 litres; 
(c) for storage water heaters with declared lo ad profile S the storage volume shall not 
exceed 36 litres. 
1.3. Requirements for mixed water at 40  °C of storage water heaters with declared load profiles 
M, L, XL, XXL, 3XL and 4XL 
From [date to be inserted: two years after this Regulation has entered into force] the 
amount of mixed water at 40  °C shall not fall below the following values: 
Declared load profile M L XL XXL 3XL 4XL 
Mixed water at 40  °C 65 litres 130 litres 210 litres 300 litres 520 litres 1  040 litres
1.4. Requirements for sound power level 
From [date to be inserted: two years after th is Regulation has entere d into force] the sound 
power level of heat pump water heater s shall not exceed the following values: 
Rated heat output 
≤ 6 kW Rated heat output 
> 6 kW and ≤ 12 kW Rated heat output 
> 12 kW and ≤ 30 kW Rated heat output 
> 30 kW and ≤ 70 kW 
Sound 
power level 
(LWA), 
indoors Sound 
power level 
(LWA), 
outdoors Sound 
power level 
(LWA), 
indoors Sound 
power level 
(LWA), 
outdoors Sound 
power level 
(LWA), 
indoors Sound 
power level 
(LWA), 
outdoors Sound 
power level 
(LWA), 
indoors Sound 
power level 
(LWA), 
outdoors 
60 dB 65 dB 65 dB 70 dB 70 dB 75 dB 80 dB 85 dB 
1.5. Requirements for emissions of nitrogen oxides 
(a) From [date to be inserted: three years after this Regulation has entered into force] 
emissions of nitrogen oxides, expressed in  nitrogen dioxide, of conventional water 
heaters shall not exceed the following values: 
– conventional water heaters using gaseous fuels: 70 mg/kWh fu el input in terms 
of GCV ; 
– conventional water heaters using liquid fu els: 120 mg/kWh fu el input in terms 
of GCV . 
(b) From [date to be inserted: five years after this Regulation has entered into force] 
emissions of nitrogen oxides, expressed in  nitrogen dioxide, of  h e a t  p u m p  w a t e r  
heaters and solar water heaters shal l not exceed the following values:  
EN 14   EN – heat pump water heaters equipped with  external combustion using gaseous 
fuels and solar water heaters using gaseous fuels: 70 mg/kWh fuel input in terms of GCV ; 
– heat pump water heaters equipped with external combustion using liquid fuels 
and solar water heaters using liquid fuel s: 120 mg/kWh fuel input in terms of 
GCV ; 
– heat pump water heaters equipped with an internal combustion engine using 
gaseous fuels: 240 mg/kWh fuel input in terms of GCV ; 
– heat pump water heaters equipped with an internal combustion engine using 
liquid fuels: 420 mg/kWh fu el input in terms of GCV . 
1.6. Requirements for product information related to water heaters 
From [date to be inserted: two years after this Regulation has entered into force] the 
instruction manuals for insta llers and end-users, free access websites of manufacturers, 
their authorised representatives and impor ters and technical documentation for the 
purposes of conformity assessment pursuant to Article 4 shall contain the following elements: 
(a) the results of the measurements for the technical parameters specified in point 6 of 
Annex III; 
(b) the results of the calculati ons for the technical paramete rs specified in point 2 of 
Annex IV; 
(c) any specific precautions that shall be take n when the water heater is assembled, 
installed or maintained; 
(d) for heat generators designed for water he aters and water heater housings to be 
equipped with such heat generators, thei r characteristics, the requirements for 
assembly, to ensure compliance with the ecodesign requirements for water heaters and, where appropriate, the lis t of combinations recommended by the manufacturer; 
(e) information relevant for disassembly, recy cling and/or disposal  at end-of-life. 
2. Ecodesign requirements for hot water storage tanks 
2.1. Requirement for standing loss 
From [date to be inserted: f our years after this Regulation has entered into force] the 
standing loss S of hot water storage tanks with storage volume V, expressed in litres, shall 
not exceed the following limit: 
16,66 + 8,33 · V
0,4Watts 
2.2. Requirements for product information re lated to hot water storage tanks 
From [date to be inserted: two years after this Regulation has entered into force] the 
instruction manuals for installe rs and end-users, the free acce ss websites of manufacturers,  
EN 15   EN their authorised representatives and impor ters and technical documentation for the 
purposes of conformity assessment pursuant to Article 4 shall contain the following elements: 
(a) the results of the measurements for the technical parameters specified in point 7 of 
Annex III; 
(b) any specific precautions that shall be ta ken when the hot water storage tank is 
assembled, installed or maintained; 
(c) information relevant for disassembly, recy cling and/or disposal  at end-of-life.  
EN 16   EN ANNEX III 
Measurements 
1. For the purposes of compliance and verifica tion of compliance with the requirements 
of this Regulation, measurements shall be made using harmonised standards the 
reference numbers of which have been published for this purpose in the Official 
Journal of the European Union , or using other reliable, accurate and reproducible 
methods that take into account the genera lly recognised state-of-the-art methods. 
They shall meet the conditions and techni cal parameters set out in points 2 to 6. 
2. General conditions for testing water heaters 
(a) measurements shall be carried out using the load profiles se t out in Table 1; 
(b) measurements shall be carried out using a 24-hour measurement cycle as 
follows: 
– 00:00 to 06:59: no water draw-off; 
– from 07:00: water draw-offs accordi ng to the declared load profile; 
– from end of last water draw-off until 24:00: no water draw-off; 
(c) the declared load profile shall be the maximum load profile or the load profile 
one below the maximum load profile; 
(d) any heat generator designed for a water heater, and any water heater housing to 
be equipped with such a heat generator,  shall be tested with an appropriate 
water heater housing and heat  generator, respectively.  
EN 17   EN Table 1: Load profiles of water heaters 
 3XS XXS XS S 
 Qtap f Tm Qtap f T m Qtap f Tm Qtap f T m Tp 
h kWh l/min ºC kWh l/min ºC kWh l/min ºC kWh l/min ºC ºC 
07:00  0,015 2 25 0,105 2 25       0,105 3 25   
07:05  0,015 2 25                
07:15  0,015 2 25                
07:26 0,015 2 25                
07:30  0,015 2 25 0,105 2 25 0,525 3 35 0,105 3 25   
07:45                           
08:01                            
08:05                    
08:15                    
08:25                    
08:30      0,105 2 25     0,105 3 25   
08:45                           
09:00 0,015 2 25                
09:30  0,015 2 25 0,105 2 25     0,105 3 25   
10:00                           
10:30                           
11:00                    
11:30  0,015 2 25 0,105 2 25     0,105 3 25   
11:45  0,015 2 25 0,105 2 25     0,105 3 25   
12:00  0,015 2 25 0,105 2 25               
12:30  0,015 2 25 0,105 2 25           
12:45 0,015 2 25 0,105 2 25 0,525 3 35 0,315 4 10 55 
14:30 0,015 2 25                
15:00 0,015 2 25                
15:30  0,015 2 25                
16:00 0,015 2 25                
16:30                     
17:00                    
18:00        0,105 2 25       0,105 3 25   
18:15      0,105 2 25     0,105 3 40   
18:30  0,015 2 25 0,105 2 25               
19:00  0,015 2 25 0,105 2 25           
19:30  0,015 2 25 0,105 2 25           
20:00        0,105 2 25               
20:30           1,05 3 35 0,42 4 10 55 
20:45      0,105 2 25           
20:46                           
21:00        0,105 2 25               
21:15  0,015 2 25 0,105 2 25           
21:30  0,015 2 25          0,525 5 45   
21:35  0,015 2 25 0,105 2 25           
21:45  0,015 2 25 0,105 2 25               
Qref 0,345     2,100     2,100     2,100        
EN 18   EN Continued Table 1: Load profiles of water heaters 
 M L XL 
 Qtap f Tm Tp Qtap f T m Tp Qtap f T m Tp 
h kWh l/mn ºC ºC kWh l/min ºC ºC kWh l/min ºC ºC 
07:00  0,105 3 25   0,105 3 25   0,105 3 25   
07:05  1,4 6 40   1,4 6 40        
07:15              1,82 6 40   
07:26             0,105 3 25   
07:30  0,105 3 25   0,105 3 25        
07:45       0,105 3 25   4,42 10 10 40 
08:01  0,105 3 25           0,105 3 25   
08:05       3,605 10 10 40      
08:15 0,105 3 25         0,105 3 25   
08:25       0,105 3 25        
08:30  0,105 3 25   0,105 3 25   0,105 3 25   
08:45 0,105 3 25   0,105 3 25   0,105 3 25   
09:00 0,105 3 25   0,105 3 25   0,105 3 25   
09:30  0,105 3 25   0,105 3 25   0,105 3 25   
10:00                 0,105 3 25   
10:30 0,105 3 10 40 0,105 3 10 40 0,105 3 10 40 
11:00                 0,105 3 25   
11:30  0,105 3 25   0,105 3 25   0,105 3 25   
11:45  0,105 3 25   0,105 3 25   0,105 3 25   
12:00                   
12:30                   
12:45 0,315 4 10 55 0,315 4 10 55 0,735 4 10 55 
14:30 0,105 3 25   0,105 3 25   0,105 3 25   
15:00             0,105 3 25   
15:30  0,105 3 25   0,105 3 25   0,105 3 25   
16:00             0,105 3 25   
16:30  0,105 3 25   0,105 3 25   0,105 3 25   
17:00                 0,105 3 25   
18:00  0,105 3 25   0,105 3 25   0,105 3 25   
18:15  0,105 3 40   0,105 3 40   0,105 3 40   
18:30  0,105 3 40   0,105 3 40   0,105 3 40   
19:00  0,105 3 25   0,105 3 25   0,105 3 25   
19:30                          
20:00                   
20:30  0,735 4 10 55 0,735 4 10 55 0,735 4 10 55 
20:45                   
20:46             4,42 10 10 40 
21:00          3,605 10 10 40         
21:15  0,105 3 25         0,105 3 25   
21:30  1,4 6 40   0,105 3 25   4,42 10 10 40 
21:35                   
21:45                          
Qref 5,845       11,655      19,07       
EN 19   EN Continued Table 1: Load profiles of water heaters 
 XXL 3XL 4XL 
 Qtap f T m Tp Qtap f T m Tp Qtap f T m Tp 
h kWh l/min ºC ºC kWh l/min ºC ºC kWh l/min ºC ºC 
07:00  0,105 3 25   11,2 48 40   22,4 96 40   
07:05                   
07:15  1,82 6 40              
07:26 0,105 3 25              
07:30                   
07:45 6,24 16 10 40            
08:01  0,105 3 25   5,04 24 25   10,08 48 25   
08:05                  
08:15 0,105 3 25              
08:25                  
08:30  0,105 3 25              
08:45 0,105 3 25                   
09:00 0,105 3 25   1,68 24 25   3,36 48 25   
09:30  0,105 3 25              
10:00 0,105 3 25                   
10:30 0,105 3 10 40 0,84 24 10 40 1,68 48 10 40 
11:00 0,105 3 25                   
11:30  0,105 3 25              
11:45  0,105 3 25   1,68 24 25   3,36 48 25   
12:00                   
12:30                   
12:45 0,735 4 10 55 2,52 32 10 55 5,04 64 10 55 
14:30 0,105 3 25                   
15:00 0,105 3 25              
15:30  0,105 3 25   2,52 24 25   5,04 48 25   
16:00 0,105 3 25              
16:30  0,105 3 25              
17:00 0,105 3 25                   
18:00  0,105 3 25              
18:15  0,105 3 40              
18:30  0,105 3 40   3,36 24 25   6,72 48 25   
19:00  0,105 3 25                   
19:30                          
20:00                   
20:30  0,735 4 10 55 5,88 32 10 55 11,76 64 10 55 
20:45                   
20:46 6,24 16 10 40            
21:00                          
21:15  0,105 3 25              
21:30  6,24 16 10 40 12,04 48 40   24,08 96 40   
21:35                   
21:45                   
Qref 24,53    46,76      93,52       
EN 20   EN 3. Conditions for testing the smart control compliance ( smart ) of water heaters 
Where the manufacturer deems it appr opriate to declare the value of smart  as being ‘1’, 
measurements of the weekly electricity and/ or fuel consumption with or without smart 
controls shall be carried out using a two-week measur ement cycle as follows: 
– days 1 to 5: random sequence of load profiles chosen from the declared load profile and 
the load profile below the declared load profile, and smart control disabled; 
– days 6 and 7: no water draw-offs, and smart control disabled; 
– days 8 to 12: repetition of the same sequen ce applied for days 1 to 5, and smart control 
enabled; 
– days 13 and 14: no water draw-offs , and smart control enabled; 
– the difference between the useful energy cont ent measured during days 1 to 7 and the 
useful energy content measured dur ing days 8 to 14 shall not exceed 2  % of Qref of the 
declared load profile. 
4. Conditions for testing solar water heaters 
The solar collector, solar hot wa ter storage tank, pump in the collector loop (if applicable) 
and heat generator shall be tested separatel y. Where the solar collector and solar hot water 
storage tank cannot be tested separately, they shall be test ed in combination. The heat 
generator shall be tested under the conditi ons set out in point 2 of this Annex.  
The results shall be used for the calculations  set out in point 3(b) of Annex IV under the 
conditions set out in Tables 2 and 3. For the purpose of establishing Qtota the efficiency of 
the heat generator using the Joule effect in el ectric resistance heating elements is assumed 
to be 100/ CC. 
5. Conditions for testing heat pump water heaters 
– Heat pump water heaters shall be tested under the conditions se t out in Table 4; 
– Heat pump water heaters which use ventilati on exhaust air as the heat source shall be 
tested under the conditions  set out in Table 5.  
EN 21   EN Table 2: Average daytime temperature [°C] 
 January February March April May June Ju ly August September October November December 
Average 
climate 
conditions  2,8 2,6 7,4 12,2 16,3 19,8 21,0 22,0 17,0 11,9 5,6 3,2 
Table 3: Average global solar irradiance [W/m2] 
 January February March April May June Ju ly August September October November December 
Average 
climate 
conditions  70 104 149 192 221 222 232 217 176 129 80 56 
Table 4: Standard rating conditions for heat pump water heaters, temperat ures in dry bulb air temperatur e (wet bulb air temperature indi cated in 
brackets) 
Heat source Outdoor air Indoor air Exhaust air Brine Water 
Temperature + 7  °C (+ 6  °C) + 20  °C 
(maximum + 15  °C) + 20  °C 
(+ 12  °C) 0 °C (inlet) / 
- 3 °C (outlet)  + 10  °C (inlet) / 
+ 7 °C (outlet)   
EN 22   EN Table 5: Maximum ventilation exhaust air available [m3/h], at a temperature of 20  °C and with 
humidity of 5,5 g/m3 
Declared load profile XXS XS S M L XL XXL 3XL 4XL 
Maximum ventilation exhaust air available 109 128 128 159 190 870 1  021 2  943 8  830 
6. Technical parameters of water heaters 
The following parameters shall be established for water heaters: 
(a) the daily electricity consumption Qelec in kWh, rounded to three decimal places; 
(b) the declared load profile, expressed by the appropriate letter in accordance with 
Table 1 of this Annex; 
(c) the sound power level LWA, in dB, indoors, rounded to th e nearest integer (for heat 
pump water heaters, if applicable); 
in addition, for water heaters usi ng fossil and/or biomass fuels: 
(d) the daily fuel consumption Qfuel in kWh in terms of GCV , rounded to three decimal 
places; 
(e) the emissions of nitrogen oxides, expre ssed in nitrogen dioxide , in mg/kWh fuel 
input in terms of GCV , rounded to the nearest integer; 
in addition, for water heater s for which the value of smart  is declared as being ‘1’: 
(f) the weekly fuel consumption with smart controls Qfuel,week,smart  in kWh in terms of 
GCV , rounded to three decimal places; 
(g) the weekly electricity consumption with smart controls Qelec,week,smart  in kWh, rounded 
to three decimal places; 
(h) the weekly fuel consumption without smart controls Qfuel,week  in kWh in terms of 
GCV , rounded to three decimal places; 
(i) the weekly electricity consum ption without smart controls Qelec,week  in kWh, rounded 
to three decimal places; 
in addition, for storage water heaters with declared load profiles 3XS, XXS and XS: 
(j) the storage volume V in litres, rounded to one decimal place; 
in addition, for storage water heaters with declared load pr ofiles M, L, XL, XXL, 3XL and 
4XL: 
(k) the mixed water at 40 °°C V40 in litres, rounded to the nearest integer; 
in addition, for solar water heaters:  
EN 23   EN (l) the collector aperture area Asol in m², rounded to two decimal places; 
(m) the zero-load efficiency η0, rounded to three decimal places; 
(n) the first order coefficient a1 in W/(m² K), rounded to two decimal places; 
(o) the second order coefficient a2 in W/(m² K²), rounded to three decimal places; 
(p) the incidence angle modifier IAM, rounded to two decimal places; 
(q) the pump power consumption solpump  in W, rounded to two decimal places; 
(r) the standby power consumption solstandby  in W, rounded to two decimal places; 
in addition, for heat pump water heaters: (s) the sound power level L
WA in dB, outdoors, rounded to the nearest integer. 
7. Technical parameters of hot water storage tanks 
The following parameters shall be esta blished for hot wa ter storage tanks: 
(a) the storage volume V in litres, rounded to one decimal place; 
(b) the standing loss S in W, rounded to one decimal place.  
EN 24   EN ANNEX IV 
Calculations 
1. For the purposes of compliance and verifica tion of compliance with the requirements 
of this Regulation, calculat ions shall be made usin g harmonised standards the 
reference numbers of which have been  published for this purpose in the Official 
Journal of the European Union , or using other appropriate  calculation methods that 
take into account the genera lly recognised state-of-the-art  methods. They shall meet 
the technical parameters and calcu lations set out in points 2 to 5. 
Technical parameters used for the calculati ons shall be measured in accordance with 
Annex III. 
2. Technical parameters of water heaters 
The following parameters shall be calculated for water heaters under average climate 
conditions: 
(a) the water heating energy efficiency ηwh in %, rounded to one decimal place; 
in addition, for solar water heaters under average climate conditions: (b) the annual non-solar heat contribution Q
nonsol in kWh in terms of primary 
energy for electricity and/ or in kWh in terms of GCV  for fuels, rounded to one 
decimal place; 
(c) the heat generator water heating energy efficiency ηwh,nonsol  in %, rounded to 
one decimal place; 
(d) the annual auxiliary electricity consumption Qaux in kWh, rounded to one 
decimal place. 
3. Calculation of the water heating energy efficiency ηwh 
(a) Conventional water heaters a nd heat pump water heaters 
The water heating energy efficien cy is calculated as follows: 
cor elec fuelref
whQ smart SCF Q CC QQ
+⋅−⋅+=) 1)( (η
 
For water-/brine-to-water heat pump water heaters, the electricity consumption 
of one or more ground water pumps shall be taken into account. 
(b) Solar water heaters The water heating energy efficiency is calculated as follows: 
totaref
whQQ⋅⋅=3666,0η
  
EN 25   EN Where: 
CC QQQaux
nonsolwhnonsol
tota ⋅+−⋅=1,0 1,1,η 
4. Determination of the smart control factor SCF and of smart control compliance smart  
(a) The smart control factor is calculated as follows: 
week elec week fuelsmart week elec smart week fuel
Q CC QQ CC QSCF
, ,, , , ,1⋅+⋅+−=
 
(b) If SCF ≥ 0,07, the value of smart shall be 1. In all other cases, the value of 
smart shall be 0. 
5. Determination of the am bient correction term Qcor 
The ambient correction term is calculated as follows: (a)
 for conventional water heat ers using electricity: 
( ) ( )ref elec cor Q smart SCF Q CCk Q −⋅−⋅⋅⋅−= ) 1( 
(b) for conventional water heaters using fuels: 
( )ref fuel cor Q smart SCF Qk Q −⋅−⋅⋅−= ) 1( 
(c) for heat pump water heaters: 
stby cor Ph k Q ⋅⋅−= 24  
Where: 
the k-values are given in Ta ble 6 for each load profile. 
Table 6:  k-values 
 3XS XXS XS S M L XL XXL 3XL 4XL 
k 0,23 0,23 0,23 0,23 0,23 0,23 0,23 0,0 0,0 0,0  
EN 26   EN Annex V 
Verification procedure for ma rket surveillance purposes 
For the purposes of checking conformity with  the requirements laid down in Annex II, 
Member State authorities shall test a single wate r heater or hot water storage tank and provide 
the information on the test results to the authorities of the other Member States. The values declared by the manufacturer shall meet the requi rements set out in Anne x II. If the measured 
parameters do not meet the values declared by  the manufacturer, in acc ordance with Article 
4(2), within the ranges set out in Table 7, th e measurement shall be carried out on three 
additional water heaters or hot wa ter storage tanks and the information on the test results shall 
be provided to the authorities of the other Me mber States and to the Commission within one 
month of testing. The arithmetic mean of the me asured values of these three water heaters or 
hot water storage tanks shall meet the requireme nts laid down in Annex II within the ranges 
set out in Table 7. 
Otherwise, the model and all other equivalent wa ter heater models or hot water storage tanks 
models shall be considered not to comply. 
Member State authorities shall use the pr ocedures set out in Annexes III and IV. 
Table 7: Verification tolerances  
Measured parameter Verification tolerance 
Daily electricity consumption Qelec The measured value shall not be more than 
5 % higher than the rated value (*). 
Sound power level LWA, indoors and/or 
outdoors The measured value shall not be more than 2 
dB higher than the rated value. 
Daily fuel consumption Qfuel The measured value shall not be more than 
5 % higher than the rated value. 
Emissions of nitrogen oxides The measured value shall not be more than 
20 % higher than the rated value. 
Weekly fuel consumption with smart controls 
Qfuel,week,smart  The measured value shall not be more than 
5 % higher than the rated value. 
Weekly fuel consumption without smart controls Q
fuel,week  The measured value shall not be more than 
5 % higher than the rated value. 
Weekly electricity consumption with smart controls Q
elec,week,smart  The measured value shall not be more than 
5 % higher than the rated value. 
Weekly electricity consumption without smart controls Q
elec,week   The measured value shall not be more than 
5 % higher than the rated value. 
Storage volume V The measured value shall not be more than 
2 % lower than the rated value. 
Mixed water at 40  °C V40 The measured value shall not be more than 
3 % lower than the rated value. 
Collector aperture area Asol The measured value shall not be more than 
2 % lower than the rated value. 
Pump power consumption solpump  The measured value shall not be more than  
EN 27   EN 3 % higher than the rated value. 
Standby power consumption solstandby  The measured value shall not be more than 
5 % higher than the rated value. 
Standing loss S The measured value shall not be more than 
5 % higher than the rated value. 
(*) ‘Rated value’ means the valu e declared by the manufacturer.  
EN 28   EN ANNEX VI 
Indicative Benchmarks ref erred to in Article 6 
At the time of entry into force of this Regula tion, the best available technology on the market 
for water heaters and hot water storage tanks in terms of water heating energy efficiency, sound power level, standing loss and emissions of nitrogen oxide s was identified as follows: 
1.
 Benchmarks for water heating energy  efficiency of water heaters: 
Declared 
load 
profile 3XS XXS XS S M L XL XXL 3XL 4XL 
Water 
heating 
energy 
efficiency 35 % 35  % 38  % 38  % 75  % 110  % 115  % 120  % 130  % 130  % 
2. Benchmarks for sound power level ( LWA), outdoors, of heat pump space heaters and 
heat pump combination heaters with: 
(a) rated heat output ≤ 6 kW: 39 dB; 
(b) rated heat output > 6 kW and ≤ 12 kW: 40 dB; 
(c) rated heat output > 12 kW and ≤ 30 kW: 41 dB; 
(d) rated heat output > 30 kW and ≤ 70 kW: 67 dB. 
3. Benchmark for standing loss of hot wate r storage tanks with storage volume V, 
expressed in litres: 
5 + 4,16 V0,4 Watts 
4. Benchmark for emissions of nitrogen oxide s, expressed in nitrogen oxide, of 
conventional water heaters using gaseous fuels: 
35 mg/kWh fuel input in terms of GCV  
The benchmarks specified in points 1, 2 and 4 do not necessarily imply that a combination of 
these values is achievable for a single water heater.