Why do people fit these for showering.   I am staying up at my Mother's house in Third World Buckinghamshire. Carers turn up, so I nip into the shower, carers fill a bowl of water to wash my Mother's arse, or whatever they do. Flow reduces, water goes cold, then temp becomes scalding, after a couple of minutes all back to normal. This is a 30 kW boiler, and the tap down stairs does not have a great deal of flow. Now I know that accumulators and flow valves can be fi