1. Gas water heater appliances: including water heaters, water heaters, and gas boilers.

2. Gas cooking appliances: including gas stoves, gas rice cookers (pots), gas ovens, gas warmers, etc.

3. Gas refrigeration appliances: including gas refrigerators and gas freezers.

4. Gas heating and cooling appliances: including gas heaters (heaters), gas air conditioners, etc.

5. Gas washing and drying appliances: including hot water washing machines, washing and drying machines, ironing equipment, etc.