I only tested it by filling it with hot water. ➤ Model Number: MM-20A-7 ➤ Product Name: Foot Bath ➤ Body Weight: 2.07 kg ➤ Body Size: 40*34*18CM ➤ Temperature Adjustment: Adjustable in 1°C increments within the range of 35°C to 48°C [Heating and Warming Function] This foot bath allows temperature settings from 35°C to 48°C, and the easy-to-use control panel makes it simple to set the temperature and switch functions. It maintains the set temperature with its warming function, so the water doesn't cool down. *However, it may vary depending on the environment, but it takes about 30 minutes to reach approximately 43°C when using tap water at room temperature.