Q My wife would love to have a power shower fitted, but when we had an ordinary boiler with a cold-water tank in the loft and a hot water cylinder, we were told that the head of water was not high ...

This means it’s ready whenever you are, without your having to heat a tank of hot water beforehand, thus saving you money.

Pump-assisted power showers have to use water from a domestic hot water tank heated by the household boiler. If we assume that both shower types are used for the same duration of time ...