On standard taps, the continuous flow heater or circulation pump starts up immediately when the handle is in the middle position. That does not have to be the case. On CoolStart taps from hansgrohe, only cold water flows initially. So your pipes are not filled with hot water unnecessarily. Only when you deliberately move the lever to the left does hot water get added. Good for the environment and your wallet!
With hansgrohe CoolStart, hot water only flows when you really need it. The energy required for this is only accessed when you actively move the tap lever to the left. You decide how high the temperature needs to be. It is not possible to move the lever to the right. This means that the energy-intensive preparation of hot water is limited to situations where it is truly needed. For briefly washing your hands, hot water is not usually required.
CoolStart can therefore save energy and also money in your home. By way of comparison: a standard tap supplies hot water when it’s in the middle position. A hansgrohe CoolStart tap supplies cold water in the middle position.