What are downsides to mixer showers?
Mixer showers are less expensive than thermostatic showers, but if you are connecting them to pipes which are connected to other points, then there is a possible downside. When the other points are used (taps, toilet etc) the flow rate to the mixer shower will be affected, and thus this will affect the temperature of the water coming out of the shower, possibly leading to scalding. This can be overcome, with a low pressure system, by laying separate pipes to the valve from both hot and cold supplies and making the shower supplies independent. You may need to contact a plumber for this as it will mean installing a special flange in the top of your hot water cylinder. In the case of a mains fed mixer a thermostatic valve is recommended.
