The heat retention effect is the temperature of the hot water when the product is filled to the bottom of the sink at a room temperature of 6 hours and 1 hour when the water is placed vertically at a temperature of 20 degrees Celsius ± 1 degrees Celsius
The cold retention effect is the water temperature when the product is filled to the bottom of the spine, at a room temperature of 6 degrees F (20 degrees C) ± 2 degrees C), and the water is left vertically for 6 hours from 4 degrees C ± 1 degrees C