What is the function of constant temperature in bathtub? Is it practical at home?

The thermostat of the bathtub is generally 1KW to 3KW. Most single-family bathtubs are 1KW. The function is that when you put hot water into the bathtub, the water temperature will decrease with time. Constant temperature is to heat the original hot water in the bathtub to make up for the heat loss of hot water during drainage and use, so it is called constant temperature. Of course, the weather at home is often cold, and I often make my own bathtub. If the hot water at home is left in the bathtub for a long time, it is best to use the constant temperature function. Generally in the south (Hainan, Guangdong, Guangxi here do not need to install constant temperature function), but the price is not expensive. 400 yuan at most.