Requirements on Labelling and Inspectio n of Energy Consumption and Energ y 
Efficiency  Rating for Elect ric Storage Tank Water H eaters  
 (Draft) 
 
Basis: Paragraph 4, Article 14 of the Energy Management Act 
Content:  
I. Scope of applicability: 
The electric storage tank water heaters denot ed in this Announcem ent are those m eeting 
the definition in CNS 11010, and prom ulgated by the Bureau of Standards, Metrology and 
Inspection (BSMI) of the Ministry of Econo mic Affairs (MOEA) as products requiring 
inspection before m arketing. 
II. Method of test:  
The Nor malized Stand ing Loss per 24 h value of the electric sto rage tank water heater 
shall be tested under the term s and in the m ethod which m ust satisfy the requirem ents set forth 
in the Chinese National Standards “CNS 11010 jElectric s torage tank water heaters”. 
III. Energy consumption r ate and efficiency Labe lling:   
(I) Dimension of  Labelling  
120mm  long, 80mm  wide. 
(II) Specim en and specifications of Labelling 

 
 
 
 

(III) The content of  the label shall includ e: 
1. Product nam e (Electric storage tank water heater) 
2. Product m odel num ber 
3. Water sto rage capac ity V (Liters ) 
4. Normalized standing loss per 24 h value (kW h/24 h) 
5. Energy efficiency rating  
6. Annual electricity consum ption (kWh), which is calculated by the Nor malized 
standing loss per 24 h value (kW h/24 h)Ò 365 days/year. 
7. The year and announcem ent numbe r of the Announcem ent containing the Criteria 
for Energy Efficiency Rating of Electric St orage Tank W ater Heaters used for this 
rating determ ination 
8. Registration num ber for this rating 
9. Other text as designated by th e Central Com petent Authority  
(IV) Labelling posting: 
While displaying or m arketing the products , the dealer shall display or post the 
labelling on the front of the products, and sha ll not hide, destroy or adopt other m eans to 
render the Labelling not r ecognizable by the consum ers. W hile m anufacturing or 
importing the products, the produc t manufacturer or im porter shall display the Labelling 
in the produ ct instruct ion/m anual, or place th e Labelling in a prom inent area on the front 
of the products. 
(V)  Energy efficiency rating:  
The products shall be classified for energy efficiency rating based on the 
Normalized Standing L oss per 24 h value sh own in the following table and shall be 
remarked onto the energy efficiency Labelling.  
 Normaliz ed Standing Loss per 24h, E st,24 (kWh /24 h) Energy 
Efficiency 
Rating  Water storage capacity V Ö 60 
Liters Water storage capacity V Ú 60 
Liters 
Class 1  Est,24 Ù 0.0715+0.0304×V2/3Est,24 Ù 0.11+0.0281×V2/3
Class 2  0.0715+0.0304×V2/3 Ö Est,24 Ù 
0.0845+0.0359×V2/30.11+0.0281×V2/3 Ö Est,24 Ù 
0.13+0.0332×V2/3
Class 3  0.0845+0.0359×V2/3 Ö Est,24 Ù 
0.0975+0.0415×V2/30.13+0.0332×V2/3 Ö Est,24 Ù 
0.15+0.0383×V2/3
Class 4  0.0975+0.0415×V2/3 Ö Est,24 Ù 
0.1105+0.0470×V2/30.15+0.0383×V2/3 Ö Est,24 Ù 
0.17+0.0434×V2/3
Class 5  0.1105+0.0470×V2/3 Ö Est,24 0.17+0.0434×V2/3 Ö Est,24
 
(VI) Post-m arket surveillan ce action s: 
While m onitoring the im plem entatio n of the energy efficien cy rating s cheme, the 
Central Competent Authority m ay conduct annual product sam pling and testing; the 
Central Competent Authority m ay designate the sam pled products and the dealer shall 
send the product sam ples to designated testin g laboratory within the allowed tim e. In 
principle, the num ber of products first sam pled and tested shall be decided based on the 
sales num ber of the designated products of th e previous year, and one sam ple shall be 
tested out of 2,500 units of such products sol d. If less than 2,500 units were sold for that 
product in the prior year, one sa mple shall be tested. Noneth eless, the Central Com petent 
Authority m ay change the sam pling ratio based on actual needs. 
 
 
 