How do Mixer Showers work? A mixer shower is fed from both the hot and cold water supply. The shower valve of the mixer shower mixes the hot and cold water to reach the temperature that you set on the valve. In general, mixer showers you will get a much faster flow of water from a mixer shower (compared to electric). In properties with low water pressure, you can combine a mixer shower with a shower pump to deliver the right flow of water for a satisfying showering experience. In conculsion, a mixer shower will work well in homes with a large storage capacity of hot water and with good water pressure.