The difference between the bathtub mode and the kitchen mode of the gas water heater is: different water output, different water temperature, and different uses.

1. Different water outputs

1. Bathtub mode: Bathtub mode has a larger water output per minute and wastes more water.

2. Kitchen mode: In kitchen mode, in order to ensure the set water outlet temperature, the water output per minute is small and no water is wasted.

2. Different outlet water temperatures

1. Bathtub mode: The default outlet water temperature of bathtub mode is higher, but it cannot be adjusted manually.

2. Kitchen mode: The default water temperature in kitchen mode is lower, but it is manually adjustable.

3. Different uses

1. Bathtub mode: Bathtub mode is used for bathing.

2. Kitchen mode: Kitchen mode is used for washing dishes.