Can a shower pump be fitted without a water tank supply?

[police state]

I have a flat which contains no water tanks, but instead draws its hot water from a 'communal supply' via a huge boiler in the block basement. The cold water supply is apparently direct from the mains.

The problem is that I have recently installed a 'thermostatic' shower, but the 'water jet' is useless, I have been told that I should install a shower pump, but when I mention this to the plumbing merchants, they suck their teeth and say their pumps are designed for gravity tanks. So the question is, what pump can I use to improve the 'shower jet'?.

[police state]

ferg said:

More info needed.

How is the hot fed??

What sort of pressure is there at the cold inlet?

You certainly can't fit a conventional shower pump on a cold main. The seals in the pump will not stand high static pressures. There are showers which work on a venturi process to 'draw' low pressure hot through using decent mains cold pressure. It is ppssible to boost mains pressure, but it's not a simple thing to do, or cheap.

Hello Ferg, (thanks for the reply)

The pressure on the cold inlets can be adjusted via 2 (bath & Kitchen) stopcocks in the flat, from a trickle to a torrent. The Hot supply is also adjustable via a stopcock, but is never a torrent.

The Hot feed comes via a huge (communal) boiler in the basement. It is always hot and generally a continual supply.