Plumbers out there- advice required

[B4 Sloth]

I fit a gravity fed shower system yesterday.

I have not added a pump as I hate the noise they make.

Whilst the flow is ok i wish it had a bit more oomf. If raise the header tank a couple of feet or so (its in the loft) will this make much difference?

Figure that a mornings work, a bit of timber that i have kicking about, couple of soldered joints and all done for under a tenner.

A pump would obviously cost in excess of 100 quid and i would have to mess about wiring it in and is beyond my comfort zone

Thanks ooplers