The most modern type of faucets are thermostatic, in which the water temperature is set manually with a special knob. Thanks to the internal mechanisms of these batteries, the outflowing water has a constant, previously set temperature regardless of the pressure and temperature of cold and hot water, flowing into the battery. This eliminates all part of the manual adjustment of the leaving water temperature, entailing the loss of some of the water consumed during regulation. This brings significant savings in the consumption of cold and hot water.