Requirements on  Minimum Energy Performance Standard, Energy Efficiency Indication , and 
Inspection for Electric Storage Tank Boiling Water H eaters (Draft)  
 
Subject：Announcement for the Requirements on Minimum Energy Performance Standard , 
Energy Efficiency Indication , and Inspection of`  Electric Storage Tank Boiling Wate r Heaters  
 
Legal Basis： Paragraph 4, Article 14 of the Energy Administration  Act 
Announcement s： 
1. The electric storage tank boiling water heaters denoted in this Announcement are those 
meeting the definition of electric storage tank boiling water heater in CNS 12623, and 
promulgated by the Bureau of Standards, Metrology and Inspection (BSMI) of the Ministry 
of Economic Aff airs (MOEA) as products requiring inspection.  
2. Electric storage tank boiling water heaters  shall comply with the following requirements:  
(1) Tank capacity of electric storage tank boiling water heaters shall be examined  in 
accordance with the relevant regulations set forth in  CNS 12623.  If the declared value of 
tank capacity is less than and equal to 100 liters , the maximum acceptable difference 
between the measured value of tank capacity and the declared value of tank c apacity shall 
be ±3% . If the declared value of tank capacity is  greater than 100 liters , the maximum 
acceptable  difference between the measured value of tank capacity and the declared value 
of tank capacity shall be ±2%.  
(2) Standing loss per 24h (E24) of electric storage tank boiling water heaters shall comply with 
the relevant regulations set forth in CNS 12623.  After conducting such examinations, 
normalized standing loss per 24h (Est,24) shall be measured. The measured value of Est,24 
shall be round ed off to four decimal places. The measured value shal l not be higher than 
the minimum  energy performance standard (MEPS) of electric storage tank boiling water 
heaters (see Table 1), and shall not be higher  than 105% of the declared value on products.  
3. Electric storage tank boiling water heaters  shall  be marked  with the declared  value  of tank 
capacity  and E st,24  on product  itself  or its packaging . 
4. The Central Competent Authority  may conduct annual product sampling in accordance with 
Guidelines for Energy Efficiency Indication  Inspection and Energy Efficiency Sampling of 
Designated Energy Using Equipment and Devices  while conducting energy efficiency 
inspection. The model number a nd quantity of testing sample shall be designated by the 
Central  Competent  Authority , and manufacturers shall send product samples to designated 
testing laboratories within allowed time limit.  
For products fail to meet the MEPS in Article  2, the Central Competent Authority will 
request related manufacturers to re -submit samples for re -testing. The re -tested samples shall 
be of the same model and twice as many as the first -tested samples. All the incurred cost 
associated with the re -testing  shall be borne by manufacturers.  
If manufactures do not conduct re-testing, or not all re -tested samples meet the energy 
efficiency  requirements, actions will be taken according to Article 21 and Article 24 of the 
Energy Administration  Act. 
 
Table1 MEPS f or electric storage tank boiling water heaters  
Minimum Energy Performance Standard (kWh)  
0.0444V+1.4633  
Note:  The declared value of tank capacity (L) shall be rounded off to the first decimal place.