Mixer showers combine the hot and cold water supplies, meaning you need a combi boiler or immersion heater to provide ready-heated water. They generally produce a stronger flow than electric showers. You can also get bath and shower mixers, where the temperature and flow are controlled by adjusting the bath taps .While some mixer showers will work with any system, others are designed either for a high-pressure water system or a low-pressure system – make sure you check when you’re buying. If your home does have low water pressure, you could also consider buying a separate pump to increase the flow. Thermostatic mixer showers do a better job of regulating the water temperature than standard mixer showers. With a thermostatic mixer shower, if someone or something starts using cold water elsewhere in the house, the water will cut out rather than scalding you –a very useful safety feature..