Hi, I've had a couple of quotes a few months ago to have a combi boiler installed. I have decided to get it done but it was a while ago and my memory is hazy, I have 2 showers in the house, I know that there maybe a problem with 1 or both of them & it/they they will need replacing when the boiler is done. One is a power shower with a pump in the airing cupboard, the other is a 'gravity fed' (is that what they're called?). What is the deal with this? Why do they need replacing, what is the reason for it?