        
1 
  
 
 
 
مشروعنهائي  
مواصفة قياسية عمانية  
 
سخانات المياه  – متطلبات أداء الطاقة ومتطلبات البطاقة     
WATER HEATERS -   
ENERGY PERFORMANCE  REQUIREMENTS AND LABELLING  
 
 
 
 
  
إعداد 
دائرة المواصفات  
المديرية العامة للمواصفات والمقاييس  
وزارة التجارة والصناعة  
ICS:91.140.06  
                                                                
 
 
هذه الوثيقة مشروع   مواصفة  قياسية عُمانية تم توزيعها لإبداء 
الرأي والملحوظات بشأنها، لذلك فإنها عرضة للتغيير والتبديل،  
ولا يجوز الرجوع إليها  كمواصفة  قياسية عُمانية إلا بعد   
اعتمادها. 
 
 
 
 This document is  a draft Omani standard  
circulated for comments. It is, therefore, 
subject to alteration and modification and 
may not be referred to as an Omani 
standard  until is approved.  
 
         
2 
  
 
  
 
 
 
 
 
 
تقديم 
المديرية العامة للمواصفات والمقاييس جهاز التقييس الوطني بالسلطنة أنشئت بموجب المرسوم السلطاني رقم 39/ 1976, ومن
مهامها إعداد المواصفات القياسية العمانية واللوائح الفنية إستناداً للمرسوم السلطاني رقم 1/87  
وقد قامت دائرة المواصفات بالمديرية بإعداد هذه المواصفة القياسية العمانية " سخانات المياه– متطلبات أداء الطاقة  " وقد تم  
إعداد المشروع باللغة الإنجليزية  استينادا على المواصفات القياسية الدولية والأجنبية والمؤلفات المرجعية.   
وقـد اعتمدت هذة المواصفة كـمواصفة قياسية عمانية ملزمة , بتاريخ  /   /   ه, الموافق  /  /  م  
 
Forward  
 
General Directorate of Standardization and Metrology (DGSM) is the National standard body in 
Sultanate of Oman. It was established according to Royal  Decree No. 39/1976. DGSM is 
responsible of issuing Omani standards and technical regulations.  
Director of standards, in the DGSM has prepared this standard “ WATER HEATERS - ENERGY 
PERFORMANCE REQUIREMENTS ”. The draft standard has been prepared in English 
language based on relevant international  and National Foreign Standard s and references.  
This standards was approved as an Omani Technical Regulation on /  / / H,   / /  
 
 
 
  
          
3 
 WATER HEATERS -   
ENERGY PERFORMANCE REQUIREMENTS  AND LABELLING  
 
Forward  ................................ ................................ ................................ ................................ .....................  2 
WATER HEATERS - ENERGY PERFORMANCE REQUIREMENTS  ................................ .....................  5 
1. Scope:  ................................ ................................ ................................ ................................ ................  5 
2. Normative References and other documents  ................................ ................................ ...................  5 
2.1. Normative references  ................................ ................................ ................................ ...........  5 
Additional references  ................................ ................................ ................................ ..................  5 
3. Terms and  Definitions  ................................ ................................ ................................ ...........................  5 
3.1 General  ................................ ................................ ................................ ................................ . 5 
3.2 Technical Definitions  ................................ ................................ ................................ ..........  6 
4. Crite ria for Applying the Minimum Energy Performance Standard (MEPS)  ................................  8 
4.1 Declaration of rated values  ................................ ................................ ................................  8 
4.2 Determining the Minimum Performance  ................................ ................................ ..........  8 
4.3 Acceptance Criteria for Labelling and Market Surveillance  ................................ ...................  8 
5. Label and Classification  ................................ ................................ ................................ ....................  9 
5.1 Determining the Energy Efficiency Class  ................................ ................................ ........  9 
5.2 Design and Placement of the Label  ................................ ................................ ..................  9 
5.3 Information and Values Contained on the Label  ................................ .............................  9 
6. Marking and Instructions  ................................ ................................ ................................ .................  13 
6.1 Ge neral Information  ................................ ................................ ................................ ..........  13 
6.2 Nameplate Information  ................................ ................................ ................................ ..... 13 
6.3 Instruction Sheet  ................................ ................................ ................................ ...............  13 
7. Registrat ion requirements  ................................ ................................ ................................ ...............  14 
7.1 Ge neral ................................ ................................ ................................ ...............................  14 
7.2 Type of documents needed for registration under the scope of this standard  ........  14 
ANNEX A – Load Profiles of Water Heaters  ................................ ................................ ..........................  15 
ANNEX B – Tests Procedures and Measurement s ................................ ................................ ...............  16 
B.1 Tests Methods Applicable  ................................ ................................ ................................ .. 16 
B.2 General Conditions for Testing Water Heaters  ................................ ................................ .. 16 
B.3 Conditions for Testing the Smart Control Compliance ('Smart') of Water Heaters  ...........  16         
4 
 B.4 Technical Parameter of Wat er Heaters  ................................ ................................ ..............  16 
ANNEX C – Calculation of the Energy Efficiency  ................................ ................................ ..................  17 
C.1  Application Methods  ................................ ................................ ................................ ..........  17 
C.2 Technical Parameters of Water Heaters  ................................ ................................ ............  17 
C.3 Calculation of the Energy Efficiency Coefficient  ................................ ................................  17 
C3.1 Water Heating Efficiency Electrical Storage Water Heaters  ................................ ....................  17 
C.4 Smart Control Factor 'SCF'  ................................ ................................ ................................ ...... 17 
C.5 Determination of the Ambient Correction Term Q cor ................................ .............................  17 
C.6 Determination of the mixed quantity of water V40  ................................ ................................  17 
ANNEX D – Calculation of the Annual Energy Consumption  ................................ ................................  18 
D.1 Procedure for calculating of the Annual Energy Consumption (AEC WH) ...........................  18 
D.3 Calculation and Presentation of the Annual Energy Consumption (AEC WH)Error! Bookmark not defined.  
ANNEX E – Water Heater Registration Application/Re newal Sample Form (informative)  ..............  19 
  
          
5 
  
WATER HEATERS - ENERGY PERFORMANCE REQUIREMENTS  
1. Scope:  
This standard specifies the Minimum Energy Performance Standard (MEPS) and testing 
requirements for the energy efficiency labeling of storage type electric  water heaters . This 
regulation is applicable  to storage type  electric water heaters up to 200L storage cap acity that 
are being  manufactured, imported,  or sold in Oman.  
The electric  water heaters must  operate in AC single -phase circuits of  240V with a frequency of 
50 Hz according to GSO 1899 :2016  
Electrical Safety:  
Products covered by the standard shall comply with the requirements set by the applicable 
standards reference in the GSO Technical Regulation for Low Voltage Equipment  
 BD-142004 -01 
2. Normative References and other documents  
2.1. Normative references  
The following  normative  reference standards ap ply. However, this standard supersedes the 
below reference standards in case of conflicting requirements. For undated references, the 
latest published version applies.  
• GSO 1899: 2016       
 GCC Standard Voltages and Frequencies for Alternating 
Current Distribution Systems"  
• EN 50440  Efficiency of domestic electrical storage water heaters and 
testing method  
 Additional references  
(2014/C 207/03) - Regulation (EU) No 814/2013 implementing Directive 2009/125/EC of the 
European Parliament and of the Council with regard to ecodesign requirements for water 
heaters and hot water storage tanks and of Commission Delegated Regulation (EU) No 
812/2013 supplementing Directive 2010/30/EU of the European Parliament and of the Council 
with regard to the energy labeling of water heaters, hot water storage tanks and packages of 
water heater and solar device . 
3. Terms and Definitions  
For the purposes of this Standard, the following terms and definitions shall apply.  
3.1 General  
         
6 
 3.1.1 Conversi on coefficient (CC): a coefficient representing the weighting of the electric 
energy compared when combined with other energies: the value of the conversion coefficient is 
CC = 1,0  
 
3.1.2 Rated heat output : declared heat output of the water heater when pro viding water 
heating at standard rating conditions, expressed in kW   
3.1.3 Rated value: value or quantity assigned by the manufacturer and marked on the 
appliance when relevant  
 
3.1.4 "Shall": where "shall" or "shall not" is used for a provision specified, that provision is 
mandatory if compliance with the standard is claimed.  
 
3.1.5 Standard rating conditions: operating conditions of water heaters for establishing the 
rated heat output, water heating energy efficiency and sound power level, and o f hot water 
storage tanks for establishing the standing loss  
3.1.6 Storage capacity (C): rated capacity of a hot water storage tank, expressed in litres  
3.1.7 Tested value: the value or quantity determined by test or measurement  
 
3.1.8 Water heater: device that:  
- is connected to an external supply of water;  
- generates and transfers heat to deliver hot water at given temperature levels, quantities and 
flow rates during given intervals;  
 
3.1.8.1 Storage water heater:  
 an appliance inten ded for heating water in a thermally well -insulated container, for the long 
term storage of the heated water, and provided with a device to control the water temperature  
3.1.9 Water heating energy efficiency (η wh): the ratio between the useful energy provi ded by a 
water heater and the energy required for its generation, expressed in percentage (%)  
3.1.10 Water heater housing: part of a water heater designed to have a heat generator fitted  
3.2 Technical Definitions  
 
3.2.2 Ambient correction term (Q cor): mean s 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  
 
3.2.3 Annual electricity consumption (AEC): annual electricity consumption of a water heater 
under the declared load profile and under given climate conditions, expressed in kWh in terms 
of final energy  
 
3.2.4 Daily electricity consumption (Q elec): consumption of electricity over 24 consecutive 
hours under the declared load profile and under given climate conditions, expressed in kWh in 
terms of final energy  
 
3.2.5 Declared load profile: load profile applied when determining water heating energy 
efficiency  
 
3.2.6 Energy content of hot  water: product of the specific heat capacity of water, the average 
temperature difference between the hot water output and cold water input, and the total mass of 
the hot water delivered  
         
7 
 3.2.7 Load profile: output performance (in terms of a sequence of flow-rates, temperatures, 
tapping pattern,…) of a water heater when fulfilling its primary function under specific ambient 
conditions  
 
3.2.8 Maximum load profile: load profile with the greatest reference energy that a water heater 
is able to provide while fulfilling the temperature and flow rate conditions of that load profile  
 
3.2.9 Mixed water quantity at 40°C (V 40): quantity of mixed water at 40°C   
 
3.2.10 Peak temperature (T p): minimum water temperature, expressed in degrees Celsius, to 
be achieved duri ng water draw -off, as specified in Annex A  
 
3.2.11 Reference energy (Q ref): The sum of the useful energy content of water draw -offs, 
expressed in kWh, in a particular load profile, as specified in Annex A  
 
3.2.12 Smart control: means a device that automatically adapts the water heating process to 
individual usage conditions with the aim of reducing energy consumption  
 
 3.2.13 Smart control compliance (smart): The measure of whether a water heater equipped 
with smart controls fulfils the criterion se t out in Annex B and C   
 
3.2.14 Smart control factor (SCF): water heating energy efficiency gain due to smart control 
under the conditions set out in Annex B and C  
 
3.2.17 Useful energy content (Q tap): energy content of hot water, expressed in kWh, provided 
at a temperature equal to, or above, the useful water temperature, and at water flow rates equal 
to, or above, the useful water flow rate, as specified in Annex A  
 
3.2.18 Useful water flow rate (f): minimum flow rate, expressed in liters per minut e, for which 
hot water is contributing to the reference energy, as specified in Annex A  
 
3.2.19 Useful water temperature (T m): water temperature, expressed in degrees Celsius, at 
which hot water starts contributing to the reference energy, as specified in Annex A  
 
3.2.20 Water draw -off: means a given combination of useful water flow rate, useful water 
temperature, useful energy content , and peak temperature, as specified in Annex A  
 
3.2.21 Weekly electricity consumption with smart controls (Q elec;week;smart ): weekly electricity 
consumption of a water heater with the smart control function enabled, expressed in kWh in 
terms of final energy  
 
3.2.22 Weekly electricity consumption without smar t controls (Q elec;week ): weekly electricity 
consumption of a water heater with the smart control function disabled, expressed in kWh in 
terms of final energy  
         
8 
 4. Criteria for Applying the Minimum Energy Performance Standard (MEPS)  
4.1 Declaration of rated  values  
• The declaration of the rated capacity shall be expressed only in terms of liters (L) 
according to the following rules:  
- Rated capacity lower or equal to 14 liters as multiples of 1 liter  
- Rated capacity from 15 liters as multiples of 5 liters  
• The declaration of the rated power shall be expressed only in terms of watt (W) as 
multiples of 50 W  
• The declaration of the energy efficiency in percentage as a multiple of 0.1%  
• The rated annual energy as a multiple of 5 kWh  
 
4.2 Determining the Minimum Perfo rmance  
4.2.1 General  
The Minimum energy performance are based on the Water Heating Energy Efficiency (see 
Annex C), which is established from the declared load profile.  
4.2.2 Declaration of the Load Profile  
For each water heater the manufacturer shall declare a load profile as described in Annex A. 
The declared load profile shall be the maximum load profile achievable by the water heater.  
 
For capacities of storage water heaters with declared load profiles of 3XS, XXS, XS and S:  
a) Stora ge water heaters with declared load profile 3XS shall not exceed 7 litres in capacity  
b) Storage water heaters with declared load profiles XXS and XS shall not exceed 15 litres 
in capacity  
c) Storage water heaters with declared load profile S shall not exceed 36  litres in capacity  
 
4.2.3 Minimum Energy Performance Standard (MEPS) for Water Heaters  
Table 1– MINIMUM ENERGY EFFICIENCY (𝜼𝒘𝒉) in % 
Declared load profile  3XS 2XS XS S M L XL 2XL 3XL 4XL 
Water heaters energy efficiency 
(with or without smart controls)  53 55 63 63 73 73 79 79 79 79 
 
4.3 Acceptance Criteria for Labelling and Market Surveillance  
The energy label shall be accepted as valid when a sample unit(s) tested meets the following 
criteria:  
Table 2 Parameters to be verified and their acceptance criteria  
Tested parameter  Value  
Tested Power  ≥ 0.90 x rated power  
Tested Power  ≤1.05 x rated power  
Tested Capacity  ≥ 0.98 x rated Capacity  
Tested mixed quantity of water (V 40) ≥ 0.97  x rated V 40 
Tested Energy (any type)  ≤ 1.05 x rated energy (any type)   
         
9 
 Note: for market surveillance, the verification of compliance with the requirements is determined 
using the same identical standard adopted at the point of registration.  
5. Label and Classification   
5.1 Determining the Energy Efficiency Class  
The energy efficiency for the maximum load profile shall be used to determine the classification 
as outlined in Table 3. 
5.2 Design and Placement of the Label  
The label shall be printed as illustrated in Figure 1. It shall be fixed and non -removable on the 
packaging and another label shall be available inside the packaging to be posted on the 
product. It is the responsibility of the retailer to place t he label on the most prominent part of the 
product to be easily visible to the consumer at the point of sale.  
The energy efficiency classes shall be represented with a visible letter and color -coded bars as 
outlined in Table 3and illustrated in Figure 1. 
Figure 1 presents an example of the label designed for electric water heaters. Different labels 
are automatically generated by the DGSM   application (see Clause 7) depending on the type of 
water heater o r storage tank once the registration of the product has been completed.  
The label must be 100 mm wide and 170 mm high.  
Table 3  Energy efficiency classification as per declared load profile  
Bar color  Energy class  Load profile  
3XS 2XS XS S M L XL 2XL 3XL 4XL 
Dark green  أ A 95 100 105 105 210 300 300 300 300 300 
Green  ب B 87 89 97 97 140 160 160 160 160 180 
Light green  ج C 77 79 87 87 93 95 98 110 110 110 
Yellow  د D 69 71 79 79 87 87 92 93 93 93 
Orange  هـ E 61 63 71 71 80 80 86 86 86 86 
Red و F 53 55 63 63 73 73 79 79 79 79 
Dark red  ز G 45 47 55 55 65 65 71 71 71 71 
 
5.3 Information and Values Contained on the Label  
The fields (a) to (k) shall comply with the following requirements:          
10 
 • Field (a): this field shall display the logo of the Directorate General For Standards and 
Metrology (DGSM)  
• Field (b): this field shall reflect the energy efficiency class, which the product attained   
• Field (c) : this field identifies the annual energy consumption of w ater heaters for the 
declared load profile,  
• Field (d):  this field identifies the water heating function, including the declared load 
profile expressed as the appropriate letter in accordance with Annex A  
• Field (e): this field identifies the value of the electric power of the water heater in kW.  
• Field (f): this field identifies the capacity of the water heater (or hot water storage) in 
liters.  
• Field (g):  this field classifies specific product information  
• Field (h):  this field shall have a QR code representing the main characteristics of the 
water heater, this m ay include the following items based on the data provided in the 
registration form:  
• Field (i): this field identifies the general product information: brand name, country of 
origin and model number  
• Field (j): this field identifies the Omani Standard  applica ble and registration number  
• Field (k): this field identifies the legal statement  
Table 4 Information required for QR code  
 
 
 
 
 
 
 
 
  Electrical  storage water heater  
Common parameters  Manufacturer's name  
Model number(s -  in case of separated elements for solar 
water heaters)  
Brand name  
Country of manufacturing  
Classification  
Energy Efficiency (%)  
Energy  Electricity  
Rated power  kW (main)  
Rated voltage  V 
Rated Capacity   liters  
Estimated Annual Energy 
consumption  kWh         
11 
  
 
 
 
 
Figure 1 Label for Water Heater  (Dimension)  
 
 
 
        
12 
  
Figure 2– Position of information on the label  
(a) 
(b) 
(f) 
(d) (e) 
(g) 
(h) 
(i) 
(j) (k) (c)         
13 
 6. Marking and Instructions  
6.1 General Information  
The following information shall be marked on the nameplate of the water -heater in Arabic and 
English. The marking shall not be on a detachable part of the unit and shall be indelible, durable 
and easily legible.  
Any information related to energy performance added on any part of the water heater unit or 
packaging shall not have any ambiguity or lead to misunderstanding of the performance of the 
unit. 
6.2 Nameplate Information  
The nameplate information shal l include, for conformity to this standard, but not limited to (e.g. 
safety requirements), the following information:  
• Manufacturer’s name and trademark.  
• Country of manufacturing  
• Manufacturer’s model or type reference and serial number of the unit.  
• Rated vo ltage or rated voltage range in volts (V).  
• Rated frequency in hertz (Hz).  
• Rated power input in Watt (W) or kilowatts (kW)  
• Rated capacity  
• Annual  electrical energy consumption  (kWh/ year). 
6.3 Instruction Sheet  
An instruction sheet or manual in Arabic and English shall be delivered with each water heater. 
Tables, drawings and circuit diagrams may be depicted in English only.  
The instruction sheet, product brochure and any other literature provided with the type of 
product shall include the following information in the order below as minimum.  
Table 5 Content of instruction sheet or manual  
(a) Name of the Manufacturer  
(b) Supplier’s model number  
(c)  The declared load profile, expressed by the appropriate letter and typical usage in 
accordance with Annex A  
(d)  The energy efficiency class of the model, determined in accordance with Annex C and 
Clause 5  
(e)  The water heating efficiency in %, rounded to the nearest integer and calculated in 
accordance with Annex C  
(f) The annual electricity consumption in kWh, rounded to the nearest integer and 
calculated in accordance with Annex D  
(g)  If applicable, other load profiles for which the water heater is suitable to use and the 
corresponding water heating energy efficiency and  annual electricity consumption as set 
out in points (e) and (f)          
14 
 (h) The thermostat temperature settings of the water heater, as placed on the market by the 
supplier  
(i)  Any specific precautions that shall be taken when the water heater is assembled, 
installed or maintained  
(j)  Where Smart Control Compliance is declared as being enabled (i.e. 'smart = 1’), an 
indication that the information on water heating energy efficiency, annual electricity and 
fuel consumption, as applicable, relate to enabled smart control s ettings only  
(k) The storage capacity in litres, rounded to the nearest integer  
7. Registration requirements  
7.1 Ge neral  
Product registration is mandatory, whereby information about registration requirements will be 
available in the information center of the Directorate General For Standards and Metrology 
(DGSM) , and reference shall be made to the separate DGSM  registration forms and 
requirements.  
The product's information shall be submitted through the registration system electronically via 
DGSM  website. The applicant should fulfill all updated requirements of the electronic 
registration system and any new requirements, pro cedures, and regulations required by DGSM . 
A draft of the registration form is provided in Annex F (the final version is the one present on the 
DGSM  website).  
Labels will be automatically published by DGSM website after the final registration of a product.  
7.2 Type of documents needed for registration under the scope of this standard  
For registration, a test report covering the product submitted shall be attached. T he test report 
shall comply with the DGSM  policy.  
Note: this test report is not exclusive from other documents required by DGSM  (e.g. Electro 
Magnetic Compatibility, safety) for registration.  
          
15 
 ANNEX A – Load Profiles of Water Heaters  
The load profiles should comply with Table 4 –Load profile of water hea ter (reference test tapping 
patterns) in EN50440 . 
 
          
16 
 ANNEX B – Tests Procedures and Measurements  
B.1 Tests Methods Applicable  
For the purposes of compliance and verification of compliance with the requirements of this 
Regulation, measurements shall be made  using standards listed in Clause 2. They shall meet 
the conditions and technical parameters set out in this standard.  
B.2 General Conditions for Testing Water Heaters  
Testing Water Heaters should comlpy with ANNEX A  
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 according to the declared load profile,  
• from end of last water draw -off until 24:00 no water draw -off. 
• The declared load profile shall be the maximum load profile.  
B.3 Conditions for Testing the Smart Control Compliance ('Smart') of Water 
Heaters  
If the manufacturer wants to declare the value of 'smart' as being ‘1’, measurements of the 
weekly electricity consumption with or without smart controls shall be carried out using a two -
week measurement cycle as follows:  
• days 1 to 5: random sequence of load profiles chosen from the declared load profile and 
the load profile one below the declared load profile, an d smart control disabled,  
• days 6 and 7: no water draw -offs, and smart control disabled,  
• days 8 to 12: repetition of the same sequence 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 content measured during days 1 to 7 and the 
useful energy content measured during days 8 to 14 shall not exceed 2 % of 𝑄𝑟𝑒𝑓 of the 
declared load profile  
• The 'smart' is declared equal to 1 if conditions expressed in Clause C.4 are met.  
B.4 Technical Parameter of Water Heaters  
The following parameters shall be established for water heaters:  
a) the daily electricity consumption 𝑄𝑒𝑙𝑒𝑐 in kWh, rounded to th ree decimal places . 
b) the declared load profile, expressed by the appropriate letter in accordance with 
ANNEX -A 
c) In addition, for water heaters for which the value of 'smart' is declared as being ‘1’:  
d) the weekly electricity consumption with smart controls 𝑄𝑒𝑙𝑒𝑐 ;𝑤𝑒𝑒𝑘 ;𝑠𝑚𝑎𝑟𝑡 in kWh, rounded to 
three decimal places.   
e) the weekly electricity consumption with out 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:  
f) the storage capacity in litres, rounded to one decimal place;  
In addition, for storage wat er heaters with declared load profiles M, L, XL, XXL, 3XL and 
4XL:  
g) the mixed water at 40 °C (V40) in litres, rounded to the nearest integer;  
          
17 
 ANNEX C – Calculation of the Energy Efficiency  
C.1  Application Methods  
For the purposes of compliance and verification of compliance with the requirements of this 
Standard, tests , and calculations (if any) shall be made using the standards listed in clause 2. 
They shall meet the technical parameters and calculations set out in Annex B .Technical 
parameters used for the calculations shall be measured in accordance with Annex B . 
C.2 Technical Parameters of Water Heaters  
The following parameters shall be calculated for water heaters under reference testing 
conditions according to the relevant standar ds listed in Clause 2:  
(a) the water heating energy efficiency η WH in %, rounded to one decimal place.  
 C.3 Calculation of the Energy Efficiency Coefficient   
C3.1 Water Heating Efficiency Electrical Storage Water Heaters  
The water heating energy efficiency is calculated as follows:  
𝜂𝑊𝐻= 𝑄𝑟𝑒𝑓
(𝐶𝐶.𝑄𝑒𝑙𝑒𝑐)(1−𝑆𝐶𝐹 .𝑠𝑚𝑎𝑟𝑡 )+𝑄𝑐𝑜𝑟 Eq. (C1)  
 
C.4 Smart Control Factor 'SCF'  
The smart control factor (SCF) is calculated as follows:  
𝑆𝐶𝐹 =1−  𝐶𝐶×𝑄𝑒𝑙𝑒𝑐 ;𝑤𝑒𝑒𝑘 ;𝑠𝑚𝑎𝑟𝑡
𝐶𝐶×𝑄𝑒𝑙𝑒𝑐 ;𝑤𝑒𝑒𝑘 Eq. (C4)  
 If SCF ≥ 0.07, the value of 'smart' shall be 1. In all other cases, the value of 'smart' shall be 0.  
C.5 Determination of the Ambient Correction Term Q cor  
The ambient correction term is calculated as follows:  
(a) for conventional water heaters using el ectricity:  
𝑄𝑐𝑜𝑟=−𝑘 .𝐶𝐶.( 𝑄𝑒𝑙𝑒𝑐.(1−𝑆𝐶𝐹 .𝑠𝑚𝑎𝑟𝑡 )−𝑄𝑟𝑒𝑓) Eq. (C5)  
Where the k values are given in Table C1 for each load profile  
Table C1 – k values used for the calculation of Q cor 
Declared load profile  3XS XXS XS S M L XL 2XL 3XL 4XL 
 
k  
0.23  
0.23  
0.23  
0.23 
  
0.23  
0.23  
0.23  
0.00  
0.00  
0.00 
 
C.6 Determination of the mixed quantity of water V40  
The mixed quantity of water needs to be determined as per the proc edure speci fied in clause 9 
of EN 50440.  
          
18 
 ANNEX D – Calculation of the Annual Energy Consumption  
D.1 Procedure  for calculat ing of the Annual Energy Consumption (AEC WH) 
Annual energy consumption AEC WH  will be autocalculated in the DGSM  registration process 
according to the following equation .  
 
𝐴𝐸𝐶 𝑊𝐻=(0.6 ∙366 )((𝑄𝑒𝑙𝑒𝑐(1−𝑆𝐶𝐹 .𝑠𝑚𝑎𝑟𝑡 ))+𝑄𝑐𝑜𝑟
𝐶𝐶) Eq. (D4)  
 
          
19 
  
ANNEX E – Water Heater Registration Application/Renewal 
Sample Form (informative)  
 
I hereby apply for the registration of a water heater(s) for the purpose of energy efficiency.  
In the country of ………………………………………………………………………………………  
(specify the country in which this application is made ) 
 
SECTION (1) – APPLICANT DETAILS  
 
Name of applicant  ……………………………………………………………………………..  
Business address  ……………………………………………………………………………..  
P.O Box  ……………………………………………………………………………..  
Post code  ……………………………………………………………………………..  
Contact person  ……………………………………………………………………………..  
Position/title  ……………………………………………………………………………..  
Tel (……)………………………………………………………………………  
Fax (……)………………………………………………………………………  
Email  ……………………………………………………………………………..  
 
          
20 
 SECTION (2) – DESCRIPTION OF THE PRODUCT  
 
Name of manufacturer  …………………………………………………………………  
Brand name  …………………………………………………………………  
Model number  …………………………………………………………………  
Country of manufacture / Made 
in XXXXX   …………………………………………………………………  
Model year  …………………………………………………………………  
Product type  …………………………………………………………………  
Rated Capacity (L) – if any  …………………………………………………………………  
Rated Power (W)  …………………………………………………………………  
Rated Voltage                     or 
Voltage range (V)  …………………………………………………………………  
Rated Current (A)  …………………………………………………………………  
Declared load profile  Select one from [3XS; 2XS; XS; S; M; L; XL; 2XL; 3XL; 
4XL] 
Rated efficiency  (%)  …………………………………………………………………  
Rated annual energy (kWh)  …………………………………………………………………  
Rated mixed quantity of water at 
40oC – V40 (L) – when relevant  …………………………………………………………………  
Dimensions of unit ( LxWxD) …………………………………………………………………  
Net weight of the unit (kg)  …………………………………………………………………  
 
If registered products issuing different commercial names or designation , please specify 
below the list of all the brand names, model numbers, and registration numbers of p roducts 
in the same family  
Brand name  Model number  Registration number  Tested product?  
   Yes/No  
   Yes/No  
   Yes/No          
21 
 SECTION (3) – TESTING AND TEST REPORT  
 
Name of laboratory  ……………………………………………………………………………..  
Test date  ……………………………………………………………………………..  
Tested unit brand name  ……………………………………………………………………………..  
Tested unit model 
number  ……………………………………………………………………………..  
Type of test   Physical testing (at  DGSM  approved laboratory)  
 
Testing method   EN 50440  
 Other (specifiy)………..................................................  
 
Testing results   
Capacity (L)  ……………………………………………………………………………..  
Power (W)  ……………………………………………………………………………..  
Voltage (V)  ……………………………………………………………………………..  
Current (A)  ……………………………………………………………………………..  
Mixed quantity of water 
at 40 oC – V40 
expressed in liters (L) 
and in percentage of 
the actual capacity (%)  ……………………………………………………………………………..  
  
 
 
 
 