1 
  
 
 
مشروع نهائي  
مواصفة قياسية عمانية  
 
 
غسالات الملابس الكهربائية المنزلية  - 
متطلبات أداء الطاقة  واستهلاك  المياه  
Electrical Clothes Washing Machines -   
Energy and Water performance requirements  
 
 
المديرية العامة للمواصفات والمقاييس  
وزارة التجارة والصناعة   
 
 
 
 
هذه الوثيقة مشروع لمواصفة قياسية عمانية تم توزيعها لإبداء الرأي والملاحظات بشأنها، لذلك فإنها  
عرضة للتغيير والتبديل، ولايجوز الرجوع إليها كمواصفة قياسية عمانية معتمدة  إلا بعد اعتمادها.  
 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 إستنادا للمرسوم السلطاني رقم  1/87 . 
وقد قامت دائرة المواصفات بالمديرية بإعداد هذه المواصفة القياسية العمانية " غسالات الملابس الكهربائية –  متطلبات أداء  
الطاقة والمياه" وقد تم إعداد المشروع باللغة الإنجليزية استنادا على المواصفة القياسية السعودية  SASO 2885:2018 
“Electrical Clothes Washing Mac hines Energy and Water performance 
requirements” واستعراض المواصفات القياسية الدولية والأجنبية والمؤلفات المرجعية  
وقد اعتمدت هذه المواصفة كمواصفة 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 “ Electrical Clothes 
Washing Machines  Energy and Water performance requirements ”. The draft 
standard has been prepared in  SASO 2885:2018 “Electrical Clothes Washing 
Machines  Energy and Water performance requirements ”  English language based 
on relevant international and National foreign standard and references,  
This standards was approved as an Omani Technical Regulation on /  /  /,     /  /    
 
 
 
 
 
 3 
  
Forward  ................................ ................................ ................................ ................................ ............  2 
1. Scope  ................................ ................................ ................................ ................................ ..........  5 
3. Terms and definitions  ................................ ................................ ................................ .................  5 
4. Criteria for applying the Minimum Efficiency Performance Standard (MEPS)  ..........................  7 
4.1 Declaration of rated values  ................................ ................................ ...............................  7 
4.2 Minimum Energy Performance Standard (MEPS)  ................................ ............................  8 
4.3 Minimu m Efficiency for Water Consumption Index (WCI)  ................................ ................  8 
4.4 Acceptance criteria for Water Extraction Index (WEI)  ................................ ......................  9 
4.5 Acceptance criteria for Labeling and market surveillance  ................................ ................  9 
5. Label and classification ................................ ................................ ................................ .............  10 
5.1 De termining the Energy efficiency class  ................................ ................................ .........  10 
5.2 Determining the Water Efficiency class  ................................ ................................ ..........  10 
5.3 Determining the Water Extraction Efficiency Class  ................................ ........................  11 
5.5 Information and values contained on the label  ................................ ...............................  12 
6. Marking and instructions  ................................ ................................ ................................ ...........  15 
6.1 General information  ................................ ................................ ................................ .........  15 
6.2 Nameplate information  ................................ ................................ ................................ .... 15 
6.3 Instruction sheet  ................................ ................................ ................................ ..............  15 
7. Registrat ion requirements  ................................ ................................ ................................ ........  16 
7.1 General  ................................ ................................ ................................ ................................  16 
7.2 Type of documents needed for registration under the scope of this standard  ..................  16 
Annex A – Determination of washing efficiency  ................................ ................................ ...........  17 
A.1 Preparation of the test load  ................................ ................................ .............................  17 
A.2 Criteria for washing efficiency index  ................................ ................................ ...............  17 
A.3 Calculation of the washing efficiency index  ................................ ................................ .... 17 
Annex B – Determination of Energy Efficiency Index  ................................ ................................ .. 19 
B.1 Calculation of the Energy Efficiency Index - General  ................................ .....................  19 
B.3 Calculation of the weighted energy efficiency  ................................ ................................  20 
B.4 Calculation of the wei ghted power in 'off -mode'  ................................ .............................  20 
B.5 Calculation of the weighted program time  ................................ ................................ ...... 21 
B.6 Calculation of the weighted power in left -on mode  ................................ ........................  21 
B.7 Calculation of the weighted time in 'left -on' mode  ................................ ..........................  21 4 
 Annex C - Calculation of the water consumption  ................................ ................................ .........  22 
C.1 Calculation of the Water Consumption Index (WCI)  ................................ ......................  22 
C.2 Calculation of the Annual Water Consumption (AWC)  ................................ ..................  22 
Annex D - Calculation of the Water Extraction Index (WEI)  ................................ ........................  24 
Annex E - Washing machine registration application/renewal sample form (informative)  ..........  25 
  
  5 
 Electrical Clothes Washing Machines  
Energy and Water performance requirements  
1. Scope 
 
This Standard specifies the energy , water consumption , spin extraction  performance and 
washing efficiency requirement for electric clothes washing machines with a rated capacity from 
3 kg up to 25 kg.  
Washing machines with additional function (dryer) are included in this standard (this standard 
covers washing function only). Standalone dryers are excluded from this standard.  
 
It shall  apply to washing machines to operate in AC single -phase circuits of 2 40V with a 
frequency of 50 Hz according to OS GSO 1899.  
Note:  This standard does not specify safety requirements, which are covered by GSO and IEC 
relevant safety standards.  
2. Normativ e references : The following  normative  reference standards apply. However, this 
Standard supersedes the below reference standards in case of conflicting requirements. For 
undated references, the latest published version applies.  
• EN 60456:2016 - Clothes washing machines for household use - Methods for measuring 
the performance  
• OS GSO 1899 - GCC Standard Voltages and Frequencies for Alternating Current 
Distribution  
3. Terms and definitions 
For the purposes of this Standard, the following terms and definitions shall apply.  
3.1 Left -on mode:  the lowest power consumption mode that may persist for an indefinite time 
after completion of the program without any further intervention by the end -user besides 
unloading of the washing machine  
3.2 Off -mode:  means a condition where the washing machine i s switched off using appliance 
controls or switches accessible to and intended for operation by the end -user during normal use 
to attain the lowest power consumption that may persist for an indefinite time while the washing 
machine is connected to a power source and used in accordance with the supplier’s 
instructions; where there is no control or switch accessible to the end -user, ‘off -mode’ means 
the condition reached after the washing machine reverts to a steady - state power consumption 
on its own  
3.3 Par tial load:   means half of the rated capacity of a washing machine for a given program   
3.4 Program: series of pre -defined operations declared by the supplier as suitable for washing 
certain types of textile  6 
 3.4.1 Standard 60  ᵒC cotton program: is the stan dard cotton program declared and mentioned in 
the instruction sheet by the manufacturer . If no value is mentioned the temperature shall be (60 
+ 2)ᵒC.  
3.4.2 Standard 40 ᵒC cotton program:  is the standard cotton program declared and mentioned in 
the instru ction sheet by the manufacturer .  If no value is mentioned the temperature shall be  
(40+ 2) ᵒC. 
3.5 Rated capacity (C rated): maximum mass in kg of dry textiles of a particular type, which the 
manufacturer declares, can be treated in the washing machine on the program selected  
3.6 Rated frequency (frated): the number of cycles per second through which an alternating 
electric current pass  as claimed by the manufacturer  
3.7 Rated power (P rated): effective power input of the water as claimed by the m anufacturer  
3.8 Rated program time : time that elapses from the initiation of the program until the 
completion of the program excluding any end -user programmed  delay as claimed by the 
manufacturer  
3.9 Rated voltage (Vrated): the voltage needed to operate th e product, as claimed by the 
manufacturer  
3.10 "Shall": where "shall" or "shall not" is used for a provision specified, that provision is 
mandatory if compliance with the standard is claimed.  
3.11 Spin speed: rotational speed of the moving part about its a xis expressed in revolutions per 
minute   
3.12 Washing machine: appliance for cleaning and rinsing of textiles using water, which may 
also have a means of extracting excess water from the textile  
3.12.1 Automatic washing machine :  means a washing machine where the load is fully treated 
by the machine without the need for user intervention at any point during the program  
3.12.2 Combined washer -drier : means a washing machine which includes both a spin 
extraction function and also a means for drying the texti les, usually by heating and tumbling  
3.12.3 Drum type machine : a clothes washing machine in which the textile material is 
contained in a horizontal or inclined drum and in which the mechanical action is produced by a 
rotation of the drum about its axis, th e movement being either continuous or periodically 
reversed   
Note: All types of machine not conforming to this definition are classified as ‘other than drum 
type’  
3.12.4 Front load washing machine : a drum type washing machine where the loading of 
clothes is located on the front  7 
 Note: front load is usually considered as horizontal axis washing machine (see IEC 60456)  
3.12.5 Top load washing machine : a washing machine where the clothes are loaded through 
the top of the machine, which is usually but n ot always covered with a hinged door  
Note: top load can be horizontal or vertical axis washing machine (see IEC 60456)  
3.12.6 Twin -tub washing machine : washing machine equipped with two tubs; one tub is used 
for washing the clothes in and second one is for  spinning the clothes dry. Clothes are manually 
moved from the washing tub to the spinning tub once the washing cycle has been completed  
Note: twin tub washing machine is also named manual washing machine and usually 
considered as vertical axis washing machine (see IEC 60456)  
3.12.6 Vertical axis washing machine: washing machine in which the load is placed in a drum 
which rotates around an axis which is vertical or close to vertical. For the purposes of this 
document, vertical axis is where the a ngle of the axis of rotation is more than 45 degrees to 
horizontal. Where the drum does not rotate, the washing machine shall be classified as a 
vertical axis washing machine.  
NOTE: The classification of vertical axis or horizontal axis in EN IEC 60456 is  only used to 
define the placement of the load into the drum.  
3.12.7 Horizontal axis washing machine:  washing machine in which the load is placed in a 
drum which rotates around an axis which is horizontal or close to horizontal. For the purposes of 
this d ocument, horizontal axis is where the angle of the axis is less than or equal to 45 degrees 
to horizontal .   
NOTE : The classification of vertical axis or horizontal axis in EN IEC 60456 is only used to 
define the placement of the load into the drum .  
3.12. 8 Motor operated washing machine : appliance operating with motor only, without any 
internal heater  
3.13 Wash cycle: complete washing, rinsing and spinning process, as defined for the selected 
program  
3.14 Washing Efficiency Index (Iw): an indicator represe ntative of the cleanliness of the 
washed item  
3.15 Water Extraction Index (WEI):  means the amount of moisture contained in the load at the 
end of the spinning phase  
 
4. Criteria for applying the Minimum Efficiency Performance Standard (MEPS) 
4.1 Declaration of rated values  
The declaration of the rated capacity shall be expressed only in terms of weight (kg) as 
multiples of 0.5 kg.  8 
 If the heating is included in the washing machine, the declaration of the rated power shall be 
expressed only in ter ms of watt (W) as multiples of 50 W  
The declaration of the Energy Efficiency Index as an integer value (no unit)  
The declaration of the annual energy consumption as a multiple of 1 kWh.  
The declaration of the annual water consumption as a multiple of 1 lit er.  
4.2 Minimum Energy Performance Standard (MEPS)  
The minimum energy performance standard (MEPS) requirement for washing machines is 
provided in table -1. The EEI of different types of washing machines must be less than the 
respective values mentioned in the table -1. EEI is calculated  as per the procedure defined in 
Annex B  of this standard.  
Table 1 – Maximum Energy Efficiency Index (EEI)    
Type of washing machines  Limit value for the rated Energy 
Efficiency  Index  
( EEI )  
*Phase one  Phase two  
Front load washing machines  EEI < 68 EEI < 68 
Top load washing machines  EEI < 85 EEI < 68 
Twin tub washing machines  EEI < 101 EEI < 68 
 
*Note :The phase one will  be canceled and replaced by   the phase two after three years of 
implementation.  
4.3 Minimum Efficiency for Water Consumption Index (WCI)  
The water efficiency requirement of washing machines is  provided in table -2. The Water 
Consumption Index (WCI) is  determined using calculation procedure defined in clause C1 in 
Annex C of this standard.  
Table 2 – MINIMUM WATER CONSUMPTION INDEX  
Type of machines  Limit value for the water consumption index  
(WCI )   
Rated Capacity  Crated < 5kg  Crated  ≥  5kg  
Horizontal axis washing machines  ≥ 2.5  ≥ 3.0 
Vertical axis washing machines  ≥ 2.0 ≥ 2.0 
 9 
 4.4 Acceptance criteria for Water Extraction Index (WEI)  
When tested at rated capacity, the weighted Water Extraction Index of the washing machine 
shall achieve an average water extraction index not exceeding 82% (see Annex D).  
4.5 Acceptance criteria for Labeling  and market surveillance  
The energy label shall be accepted as valid when a single sample of an app liance or unit model, 
tested for an initial screening test, meets the following criteria as applicable:  
Tested Parameters  Values  
Measured power  ≥ 0.90 x rated value  
Measured power (general)  ≤ 1.05 x rated power  
Measured power (motor operated)  ≤ 1.15 x rated power  
Measured annual energy  ≤1.10 x rated annual energy  
Measured program time  ≤ 1.10 x rated program time   
Measured water consumption  ≤ 1.05 x rated water consumption  
Measured water extraction index (moisture content ) ≤ 1.10 x rated value  
Measured Maximal Spin Speed (if available)  ≥ 0.90 x rated value  
Measured duration of the left -on mode  ≤ 1.10 x rated value  
Measured power consumption in left -on mode  
Measured power consumption in off -mode  
The measured value of power consumption in off -mode (P o) and left -on mode (P l): 
• More than 1.00 W ≤ 110 % x rated power  
• Less than or equal to 1.00 W ≤ (0.10 W + rated power)     
If the rated/measured spinning capacity is different from the rated washing capacity, this value 
shall not be lower than 55% of  the rated (washing) capacity.  
  10 
 5. Label and classification 
5.1 Determining the Energy efficiency class  
The energy efficiency class of a washing machine shall be determined on the basis of its 
Energy Efficiency Index (EEI) as set out in Table 3. The Energy Efficiency Index (EEI) of a 
household washing machine shall be determined in accordance with procedure defined at 
Annex B of this standard.  
Table 3: ENERGY EFFICIENCY CLASSES  
Bar color  Equivalent Energy 
efficiency class 
(Arabic)  Equivalent Energy 
efficiency class 
(English)  EEI 
Dark green  أ A        EEI < 34  
Green  ب B 34 ≤ EEI < 41  
Light green  ج C 41 ≤ EEI < 46  
Yellow  د D 46 ≤ EEI < 52  
Orange  هـ E 52 ≤ EEI <68  
Red و F 68 ≤ EEI < 85  
Dark red  ز G 85 ≤ EEI < 101  
 
5.2 Determining the Water Efficiency class  
The water efficiency class of a washing machine  shall be determined on the basis of Water 
Consumption Index (WCI)  set out in Table-4 and shall be determined as outlined in clause C.1. 
at Annex C  of this standard.  
Table 4: WATER CONSUMPTION INDEX CLASSES  
Energy efficiency class 
(Arabic)  Energy efficiency class 
(English)  WCI 
أ A          6.0 ≤ WCI 
ب B 5.5 ≤ WCI < 6.0  
ج C 5.0 ≤ WCI < 5.5  
د D 4.5 ≤ WCI < 5.0  11 
 Table 4: WATER CONSUMPTION INDEX CLASSES  
Energy efficiency class 
(Arabic)  Energy efficiency class 
(English)  WCI 
هـ E 3.5 ≤ WCI < 4.5  
و F 3.0 ≤ WCI < 3.5  
ز G 2.0 ≤ WCI < 3.0  
  
5.3 Determining the Water Extraction Efficiency Class  
The Water Extraction efficiency class of a washing machine shall be determined on the basis of 
Water Extraction Index (WEI) set out in Table -5 and shall be determined as per the procedure 
outlined in Annex D  of this standard.  
Table 5: WATER EXTRACTION EFFI CIENCY CLASSES  
Energy efficiency class 
(Arabic)  Energy efficiency class 
(English)  WEI 
أ A        WEI < 45 
ب B 45 ≤ WEI < 54  
ج C 54 ≤ WEI < 63  
د D 63 ≤ WEI < 72  
هـ E 72 ≤ WEI < 81  
و F 81 ≤ WEI < 90  
ز G             90 ≤ WEI  
 
5.4 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 retail er to place the 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 each be represented with a visible letter and color -coded 
bars as outlined in Table 3 and illustr ated in Figure 1.  12 
 The Water Consumption efficiency classes shall each be represented with a visible letter, as 
outlined in Table 4 and illustrated in Figure 1.  
The Water Extraction efficiency classes shall each be represented with a visible letter, as 
outlined in Table 5 and illustrated in Figure 1.  
The label must be 100 mm wide and 170 mm high.  
5.5 Information and values contained on the label  
The fields (a) to (h) outlined in Figure 2 shall comply with the following requirements:  
• Field (a): This field shall display the logo of the Omani  Standards, 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 shall reflect the annual en ergy use in kWh.  
• Field (d): this field shall reflect the capacity of the product expressed in kg.  
• Field (e): this field shall reflect the annual water consumption and water efficiency class.  
• Field (f):  this field shall reflect the water extraction efficien cy class.  
• Field (g):  This field shall have a QR code representing the main characteristics of the  
washing machine, this may include the following items based on the data provided in the 
registration form:  
o Manufacturer name  
o Model number  
o Brand name  
o Country of origin  
o Rated power (W)  
o Rated voltage (V)  
o Rated capacity (kg)  
o Energy Classification (unit -less)  
o Water Efficiency classification (unit -less)  
o Rated Annual Energy Consumption - AEC (kWh)  
o Rated Annual Water Consumption – WEC (liters and class)  
o Rated Water Ex traction Index - WEI (%)  
• Field (h): this field shall reflect the identification of the product.  
• Field (i): this field shall reflect the registration number and standard reference number.  
• Field (j): this field shall reflect the legal statement attached to energy efficiency labels.  
 
 13 
  
Figure 1 – Label for washing machines  
 
 
14 
  
Figure 2– Position for display of information  
(e) 
(f) 
(i) 
(j) (g) (a) 
(d) (c) (b) 
(h) 15 
  
6. Marking and instructions 
6.1 General information  
The following information shall be marked on the nameplate of the washing machine in (English) 
or (Arabic and English).  The marking shall not be on a detachable part of the unit and shall b e 
indelible, durable and easily legible.  
Any information related to energy performance added on any part of the washing machine 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 shall include, for conformity to this standard the following 
information:  
• Manufacturer’s name and/or trademark.  
• Country of origin.  
• Manufacturer’s model or type reference and serial number of the unit.  
• Rated v oltage or rated voltage range in volts (V).  
• Rated frequency in hertz (Hz).  
• Rated power input in Watt (W) or kilowatts  (kW)  
• Rated Capacity (kg)  
• Annual Energy Consumption (kWh/year or kWh)  
• Annual Water Consumption (liters/year or liters)  
6.3 Instruction shee t 
An instruction sheet and manual in both Arabic and English shall be delivered with each 
washing machine . Tables, drawings and circuit diagrams may be depicted in English only.  
The instruction sheet or manual shall include the following information as a minimum:  
• The information specified in clause 6.2 except 'Country of origin' and 'serial number'  
• Dimensions of the unit  
• Instruction for mounting and connection to the pipes  
• Instruction for connection to the electrical installation  
• Instructions necessary for the correct operation of the unit and any special precautions 
to be observed to ensure its safe use and maintenance  
• Instruction for packing and unpacking the unit  
• Instructions on unit handling and rigging  
• Net weight of the unit  
 
 16 
 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 Sultanate of Oman , 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 shall fulfill all updated requirements of the el ectronic registration 
system and any new requirements, procedures, and regulations required by DGSM . A draft of 
the registration form is provided in Annex E (the final version is the one present on the DGSM  
website).  
The label of the product will be automa tically published by DGSM  website after the final 
registration.  
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. Test report shall 
comply with DGSM  policy.  
Note: this test report is not exclusive from other documents required by DGSM  (e.g. Electro 
Magnetic Compatibility, safety,…) for registration.   17 
 Annex A – Determination of washing efficiency  
A.1 Preparation of the test load  
Test loads are prepared as given in EN60456 Annex ZA.2  
For washing machines with a rated capacity up to 15 kg, conditions for the preparation of the 
loads expressed in EN60456 Table ZA.1 apply  
For washing machines with a rated capacity from 15 kg up to 25 kg the followi ng rules apply as 
a supplement to Table ZA.1 in EN 60456  
• For test load masses to the whole or half kilogram rating which are greater than those 
specified in the table ZA.1, the number of stain test strips is equal to the nominal test 
load mass (rounded to the nearest kilogram), the number of sheets is the nominal test 
load mass divided by (3 × 0,725) (rounded to the nearest whole sheet) and the number 
of pillowcases is the nominal test load mass divided by (3 × 0,24) (rounded to the 
nearest whole pillow cas e). The balance of the required nominal test load mass is made 
up of towels as required. The mass of all base load items can be expected to decline 
slightly with increasing age.  
• Difference between base load mass and test load mass is due to the mass of th e test 
strips as  
• The actual number of towels may differ from the number indicated above (which is 
intended to be indicative)  
A.2 Criteria for washing efficiency index  
For washing machines the Washing Efficiency Index (Iw) shall be greater than 0.88 (Formu la 
A.1) for each testing conditions at full load, 60°C and half load 60°C and 40°C.  
Tests are conducted with a water hardness of 2.5 (± 0.2) mmol/l of CaCO 3 equivalent.  
A.3 Calculation of the washing efficiency index  
For the calculation of the Washing Efficiency Index (I w), the weighted washing efficiency of the 
washing machine for the standard 60°C cotton program at full and partial load and for the 
standard 40°C cotton program at partial load is compared to the washing efficiency of a 
referenc e washing machine, where the reference washing machine shall have the 
characteristics indicated in the generally recognized state -of-the-art measurement methods, 
including methods set out in EN60456.  
The Washing Efficiency Index (I w) is calculated as follo ws and rounded to three decimal places  
Iw = (3 × I w;60 + 2 × I w;60;½ + 2 × I w;40;½ )/7 Formula (A.1)  
Where:  
Iw;60   : washing efficiency index of the standard 60°C cotton program at full load;  
Iw;60;½ : washing efficiency index of the standard 60°C cot ton program at partial load;  
Iw;40;½ : washing efficiency index of the standard 40°C cotton program at partial load.  18 
  
 The Washing Efficiency Index of one standard cotton program (I W,p) is calculated as follows:  
𝐼𝑊,𝑝=1
𝑛×∑(𝑊𝑇,𝑖
𝑊𝑅,𝑎)𝑛
𝑖=1 Formula (A.2)  
 
Where:  
WT,i = Washing Efficiency of the washing machine under test for one test cycle (i);  
WR,a = Average Washing Efficiency of the reference washing machine;  
n = number of test cycles, n ≥ 3 for the standard 60°C cotton program at full load, n ≥ 2 for the 
standard 60 °C cotton program at partial load and n ≥ 2 for the standard 40°C cotton program at 
partial load.  
 
The Washing Efficiency (W T,i) is the average o f the reflectance values of each test strip after 
completion of a test cycle.  
 
  19 
 Annex B – Determination of Energy Efficiency Index  
 
B.1 Calculation of the Energy Efficiency Index - General  
For the calculation of the Energy Efficiency Index (EEI) of a washing machine model, the 
weighted annual energy consumption of a washing machine for the standard 60°C cotton 
program at full and partial load and for the standard 40°C cotton program at parti al load is 
compared to its standard annual energy consumption.  
The Energy Efficiency Index (EEI) is calculated as follows and rounded to one decimal place:  
𝐸𝐸𝐼 = 100  𝐴𝐸𝐶
𝐴𝐸𝐶 𝑟𝑒𝑓  
Formula (B.1)  
 
Where:  
AEC = annual energy consumption of the washing machine (kWh);  
AEC ref = standard annual energy consumption used as reference value (kWh).  
 
The standard annual energy consumption (AEC ref) is calculated in kWh as follows and rounded 
to two decimal places:  
AEC ref = 47.0 × C rated + 51.7  Formula (B.2)  
 
Where:  
Crated = rated capacity of the washing machine for the standard 60°C cotton program at full load 
or the standard 40°C cotton program at full load, whichever is the lower.  
 
The weighted annual energy consumption (AEC) is calculated in kWh as follows and is round ed 
to two decimal places:  
𝐴𝐸𝐶 = 𝐸𝑡×220 +[𝑃𝑜 ×525600 −(𝑇𝑡 × 220)
2+𝑃𝑙 ×525600 −(𝑇𝑡 × 220 )
2
60×1000]  
Formula (B.3)  
 
 
Where:  
Et = weighted energy consumption (in kWh);  
Po = weighted power in ‘off -mode (in W)’;  
Pl = weighted power in the ‘left -on mode’ ( in W);  
Tt = weighted program time (in minutes – min);  20 
 220 = total number of standard washing cycles per year.  
Constant  (time)  
Where the washing machine is equipped with a power management system, with the washing  
machine reverting automatically to ‘off -mode’ after the end of the program, the weighted annual 
energy consumption (AEC) is calculated taking into consideration the effective duration of ‘left -
on mode’, according to the following formula B.6  
𝐴𝐸𝐶 = 𝐸𝑡×220
+[𝑃𝑙 ×𝑇𝑙  × 220 + 𝑃𝑜 ×[525600 −(𝑇𝑡 × 220 )−(𝑇𝑙 × 220 )]
60×1000] 
  
Formula (B.4)  
 
Where:  
Tl = time in ‘left -on mode (in minutes –min)’  
 
B.3 Calculation of the weighted energy efficiency  
The weighted energy consumption (E t) is calculated in kWh as fo llows and rounded to three 
decimal places:  
Et = (3 × E t;60 + 2 × E t;60;½ + 2 × E t;40;½ )/7 Formula (B.5)  
Where:  
Et;60   : energy consumption of the standard 60°C cotton program at full load;  
Et;60;½ : energy consumption of the standard 60°C cotton program at partial load;  
Et;40;½ : energy consumption of the standard 40°C cotton program at partial load.  
 
B.4 Calculatio n of the weighted power in 'off -mode'  
The weighted power in ‘off -mode’ (P o) is calculated in Watt as follows and rounded to two 
decimal places:  
Po = (3 × P o;60 + 2 × P o;60;½ + 2 × P o;40;½ )/7  Formula (B.6)  
Where:  
Po;60   : power in ‘off -mode’ of the st andard 60°C cotton program at full load;  
Po;60;½ : power in ‘off -mode’ of the standard 60°C cotton program at partial load;  
Po;40;½ : power in ‘off -mode’ of the standard 40°C cotton program at partial load.  
 21 
 B.5 Calculation of the weighted program time  
The weighted program time (T t) is calculated in minutes as follows and rounded to the nearest 
minute:     
Tt = (3 × T t;60 + 2 × T t;60;½ + 2 × T t;40;½ )/7  Formula (B.7)  
Where:  
Tt,60   : program time of the standard 60°C cotton program at full load;  
Tt;60;½ : program time of the standard 60°C cotton program at partial load;  
Tt;40;½ : program time of the standard 40°C cotton program at partial load.  
 
B.6 Calculation of the weighted p ower in left -on mode  
The weighted power in the ‘left -on mode’ (P l) is calculated in Watt as follows and rounded to two 
decimal places:  
Pl = (3 × P l;60 + 2 × P l;60;½ + 2 × P l;40;½ )/7  Formula (B.8)  
 
Where:  
Pl;60   : power in ‘left -on mode’ of the standa rd 60°C cotton program at full load;  
Pl;60;½ : power in ‘left -on mode’ of the standard 60°C cotton program at partial load;  
Pl;40;½ : power in ‘left -on mode’ of the standard 40°C cotton program at partial load.  
 
B.7 Calculation of the weighted time in 'left-on' mode  
The weighted time in ‘left -on mode’ (T l) is calculated in minutes as follows and rounded to the 
nearest minute:  
Tl = (3 × T l;60 + 2 × T l;60;½ + 2 × T l;40;½ )/7  Formula (B.9)  
Where:  
Tl;60   : time in ‘left -on mode’ of the standard 60°C co tton program at full load;  
Tl;60;½ : time in ‘left -on mode’ of the standard 60°C cotton program at partial load;  
Tl;40;½ : time in ‘left -on mode’ of the standard 40°C cotton program at partial load.  
 
 
  22 
 Annex C - Calculation of the water consumption  
 
C.1 Calculation of the Water Consumption Index (WCI)  
The water consumption index of a washing machine is calculated as follows based on the 
energy consumption of 1 standard cycle at 60 0C cotton at full load and rounded up to with 2 
decimals.  
𝑊𝐶𝐼 =1+ 𝐿𝑜𝑔 𝑒 (𝑊𝑡60
30 × 𝐶𝑟𝑎𝑡𝑒𝑑  )
𝐿𝑜𝑔 𝑒 (1−𝐹) 
  
Formula (C.1)  
 
Where:  
WCI   : value u sed to determine the classification of the appliance related to water 
consumption;  
Wt;60   : water consumption of the standard 60°C cotton program at full load;  
30      : base water consumption per kg of capacity;  
Crated  : rated capacity of clothes washer in (kg); 
F        : water reduction factor (30%) = 0.30.   
C.2 Calculation of the Annual Water Consumption (AWC)  
The weighted annual water consumption (AWC) of a washing machine is on the water 
consumption for the standard 60°C cotton program at full and partial load and for the standard 
40°C cotton program at partial load as follows and rounded up to the integer.  
AWC = 220 x W t Formula (C.2)  
  
Where:  
Wt   : weighted water consumption (liter)  
220 : number of cycles per year  
 
The weighted water consumption is calculated as follows and rounded up to the integer.  
Wt = (3 × W t;60 + 2 × W t;60;½ + 2 × W t;40;½ )/7  Formula (C.3)  
Where:  
Wt;60   : water consumption of the standard 60°C cotton program at full load;  
Wt;60;½ : water consumption of the standard 60°C cotton program at partial load;  
Wt;40;½ : water consumpti on of the standard 40°C cotton program at partial load.  
 23 
  
  24 
 Annex D - Calculation of the Water Extraction Index (WEI)  
 
The weighted remaining moisture content which is referred to as the Water Extraction Index 
(WEI) of a washing machine is calculated in percentage as follows and rounded to the nearest 
whole percent:  
 
𝑊𝐸𝐼 =(3.𝑊𝐸𝐼 60+2.𝑊𝐸𝐼 60;½+2.𝑊𝐸𝐼 40;½)
7 Formula (D.1)  
 
Where:  
 
WEI 60: is the water extraction index for the standard 60°C cotton program at full load, in 
percentage and  rounded to the nearest whole percent;  
WEI 60;½:: is the water extraction index for the standard 60°C cotton program at partial load, in 
percentage and rounded to the nearest whole per cent;  
WEI 40;½: is the water extraction index for the standard 40°C cott on program at partial load, in 
percentage and rounded to the nearest whole per cent.  
 
The Water extraction index for each standard cotton program is calculated according to 
EN60456 Annex ZA 5.4 (noted D in EN60456)  
 
  25 
 Annex E - Washing machine registration application/renewal sample form (informative)  
 
I hereby apply for the registration of a washing machine(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  ……………………………………………………………………………..  
 
  26 
 SECTION (2) – DESCRIPTION OF THE PRODUCT  
 
Name of manufacturer  ……………………………………………………………………
………..  
Brand name  ……………………………………………………………………  
Model number  ……………………………………………………………………  
Country of manufacture / Made in 
XXXXX   ……………………………………………………………………  
Model year  ……………………………………………………………………  
Type   Front load  
 Top load  
 Twin tube  
Position of the axis   Horizontal  
 Vertical  
Combined washing and drying   Yes 
 No 
Energy management control   Yes 
 No 
Rated capacity (kg)  ……………………………………………………………………  
Rated Power (W)  ……………………………………………………………………  
Rated Voltage or Voltage range (V)  ……………………………………………………………………  
Rated power input (W)  ……………………………………………………………………  
Rated Maximal Spin speed (tr/min)   
Rated values (full load – 60oC) – see 
Note   
Rated values (half load – 60oC) – see 
Note   
Rated values (half load – 40oC) – see 
Note   
Rated Energy Efficiency Index - EEI ( -) 
and related Energy Class  autocalculated based on the rated values  
Rated Annual Water Consumption - 
AWC (liter)  autocalculated based on the rated values  
Rated Water Consumption Index – 
WCI based on performance at full load, 
60C - Wt;60  (liter) and related Water 
Consumption Class  autocalculated based on the rated values  
Rated Water Extraction  Index – WEI 
(%) and related Water extraction 
Efficiency Class  autocalculated based on the rated values  
Dimensions of unit (mm x mm x mm)  ……………………………………………………………………  
Net weight of the unit (kg)  ……………………………………………………………………  
 
 
 
 
  27 
  
 
 
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 products in the same family  
Brand name  Model number  Registration number  Tested product?  
   Yes/No  
   Yes/No  
   Yes/No  
Note: for each cycle at full and half load the rated values are related to Washing Efficiency, Energy 
consumption, Water consumption, water extraction index, Duration of the cycle, Power and 
duration for the left -on mode, power in Off -mode  28 
 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)  
Note:  test can be done in the manufacturer’s laboratory only if the 
laboratory is recognised by a DGSM  notified body to operate 
according to ISO 17025 – see Clause 8)  
Testing method   EN 60456  
 
Test report  The test report shall include all results used to calculate AEC, 
AWC, WEI and related classification for energy, water and 
spinning efficiency; this means the values for each cycle at 60 oC 
full load, 60 oC half load and 40 oC half load used in the formulas 
presented in Annex A to D.  
Testing results:  Testing results including all intermediate values for energy, 
operating times will be required in the reg istration system  
Tested Capacity (kg)   
Tested Power (W)  ……………………………………………………………………………..  
Tested Voltage (V)  ……………………………………………………………………………..  
Spin speed (tr/min)  …………………………………   Tested  
 Declared  
Tested values (full load 
– 60oC) – see Note  ……………………………………………………………………………..  
Tested values (half 
load – 60oC) – see 
Note  ……………………………………………………………………………..  
Tested values (half 
load – 40oC) – see 
Note  ……………………………………………………………………………..  
Note: for each cycle at full and half load the tested values are related to Washing Efficiency, 
Energy consumption, Water consumption, Water extraction index, Duration of the cycle, 
Power and duration for the left -on mode, power in Off -mod 
 
SECTION (4) – ATTACHMENTS  
List of the following shall be attached to the registration:  
• Test report  
• Image of the appliance  
• Brand logo