shower installation questions

Hello, I have some questions regarding installing a shower.
The place is a ground floor flat, it has a water cyclinder in the cupboard but from what I see there is no seperate 'cold water header tank' like you normally have in the loft, does this mean there is a water buffer in the cylinder? i cant understand how/where the water is stored.
My other question is i need to install a shower in the bathroom as the pressure in the hot tap is not enough as i tried a combination cold/hot tap but the hot water just dribbles out of the hot tap.
I gather that an electric shower can run off mains cold water, but a shower pump (which has both hot and cold feeds) which you locate elsewhere the pressure must be the same going into it, so therefore this may not be suitable to install as there is no header tank?
Does anyone have any suggestions or a good website that explains all this? thx.
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