Product List

Electrical Water Heater

Topten China presents the best energy efficient electrical water heater on Chinese market.

1. Scope

Electrical storage water heater

Household using

The capacity is below 120L

2. Selection criteria

To be selected in the Topten product list, the electrical water heater’s Standing loss per 24h and Hot-water output rate should meet national energy efficiency grade 1 requirement and perform as the following values:

Rated Capacity (RC, L)

Standing loss per 24h

Hot-water output rate (%)




50< RC≤80L



80< RC≤120L



3. Terms

Hot-water output rate: It is the ratio between the actual hot water output (L) and the rated water capacity (L), when the water heater is worked under the rated conditions. The higher the water heater’s hot-water output rate, the more efficient of the product. Unit: %

Standing loss per 24h: It is the energy loss rate within 24 hours without water exchange, when the water heater is filled full of water and run at the stable condition. The lower the water heater’s standing loss per 24h, the more efficient of the product.

Power: It is the electricity input when the water heater performs heating function. Unit: W.

Rated capacity (RC): The water heater’s capacity indicated by the manufacturer. Unit: L.

Temperature range: The temperature of the output hot water that the water heater can produce. Unit: .

Installation:The installation types of the water heater water’s storage tank. The typical installations include: horizontal and veridical

National energy efficiency grade: This is the mandatory grading system for energy using products to disclose the energy performance to the consumers. Grade 5 is the minimum energy efficiency requirement for the market access and Grade 1 is the best for the electrical water heater. Followings are the national energy efficiency requirement:

National energy efficiency grade

Standing loss per 24h

Hot-water output rate (%)

















4. References

GB 21519 – 2008 Minimum allowable values of the energy efficiency and energy efficiency grades for electrical storage water heaters

GB/T 20289 – 2006 Electrical storage water heater

5. Data sources


China Energy Labeling Program (






All the information presented at Top10 China comes from public available information sources. If you think you spot an error, please report to

Producers and retailers are kindly asked to contact about more products which meet the Top10 selection criteria.