Multiple Showers, Pumps and Pressurised Systems

[Marrou]

Ok, be gentle with me, I have no idea about this at all...

We are renovating. We have one first floor bathroom with an Aqua Lisa shower that has a pump which is next to the hot water cylinder downstairs. We want to install a second bathroom with a similar shower. I assumed we'd just buy a shower and another pump but our builder is not so sure as he thinks there might not be enough pressure to run both showers at the same time.

He is talking about two options.

1. Buying one mother of all pumps to run both showers (cost £530 + vat)
2. Replacing the cylinder with a pressurised system (I have no idea what this means) at a cost of about £800 + vat.

Is any of this necessary or am I just really naive and don't understand?

I don't understand why you would need to run both showers at the same time? That would be a problem in our house given our low water pressure. But we just make sure both showers aren't being used at the same time - and that nobody flushes a loo, puts the washing machine/dishwasher on or runs a tap anywhere!

We have the Mother of all Pumps as all our water is pumped upwards from the cellar.

This Grundfos bad boy gives superb pressure even three floors up; taps, showers, loos - you name it. All showers take your head nearly clean off.

One plumber mentioned he thought that it was a sledgehammer to crack a nut - but it really does work.