At the beginning I had a hand mixer, which had the disadvantage that if you accidentally came against the lever, the shower water suddenly hot or cold or not at all more came. After that I had a thermostatic shower mixer from the hardware store. This mixer did not consider the temperature, the water suddenly kalt.Es was seen again, who buys cheap, buys twice. The Grohe Grohterm 1000 34143 Thermostat shower mixer reacts very quickly, no more Temperarurschwankungen. Just awesome !!!