Gas Water Heater

Gas Water Heater

Top10 China presents the most energy efficient gas water heater on Chinese market.

1, Scope

Gas water heater for hot water supply.

Rated heat input (kW): 18-27

2, Selection Criteria

To be selected into Top10 product list, the gas water heater must meet the requirement of energy efficiency grade 1 as below.



Rated heat input (kW)

50% rated heat input (kW)

Thermal efficiency value (%)





Gas cost (10 years): The gas cost of gas water heater in 5 years, according to the annual gas consumption below. The gas price is set at 2.05 RMB per m3. Unit: RMB.

Annual gas consumption: The gas consumed by gas water heater in one year. The typical daily gas consumption of gas water heater is heating 200L water and the water temperature raise 30. Annual gas consumption is 365 days’ consumption, Unit: m3. The colorific value of gas is set at 8400kcal/m3.

National energy efficiency grade: The mandatory grading system for energy using products to disclose the energy performance to the consumers. Grade 3 is the minimum energy efficiency requirement for the market access and Grade 1 is the best for the gas water heater.

Thermal efficiency:The transformation efficiency of gas water heaters from gas to thermal under certain test conditioners, Unit: %.

Rated heat inputThe heat released by the gas water heater in certain time using the standard gas under the rated supply gas pressure, Unit : kW.

Hot water supply rateThe ability of the gas water heater to supply hot water, Unit: L/min.

Gas type Manufactured Gas(R)Natural Gas(T)Liquefied petroleum gas(Y).

Smoke exhaustion waysForce exhaustion way (Q)The air for burning is from indoors, the smoke is discharged to outdoors under force. Force balance way (G)The pipe for supplying air and exhausting smoke is fixed outdoors, supplying air and discharging smoke are both under force.

4, Reference

GB 20665-2006 Minimum allowable values of the energy efficiency and energy efficiency grades for domestic gas instantaneous water heater and gas fired heating and hot water combi-boilers

GB 6932-2001 Instantaneous water heater

5, Data sources


China Energy Labeling Program

Zhongguancun Online

Wanwei Household


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.