Mixer showers are supplied with hot and cold water and these supplies can vary in temperature and pressure.
- Pressure balanced mixer showers
These recognise and compensate for fluctuations in the incoming water pressure, in order to maintain a showering temperature within +/- 1c.
However, pressure-balanced mixer showers do not make allowances for fluctuations in the incoming water temperature. Under such circumstances, the water delivered through the shower will be prone to temperature variation.
- Thermostatic mixer showers
These recognise and compensate for fluctuations in both the incoming water pressure and the incoming water temperature. Therefore, if someone runs a tap or flushes a toilet, the shower will adjust to keep the shower temperature within +/- 1c. This can be important if there are young children or elderly people in the household.