Shower pump in loft question.

[a1lry]

Will try to make this simple;
Need to fit a shower pump in loft due to lack of space in airing cupboard.
Dedicated 22mm pipe via Deleted flange from hot,
Dedicated 22mm from cold ( old galvanised tank )
Grohe avencys mixer.
Height from loft floor to underside of cold tank is 30in.
Shower is used all the time but doesn't need to blast you into next week.
Any ideas on what shower pump to use ????????????