We have customers who have taps and showers which are very demanding and they want to continue using that particular tap or shower.

To get mains pressure hot and mains pressure cold this is the solution for you:-

Buy two SP21S (or two SP2B plus two SP1U).
A SP21S consists of an automatic pump and a slave pump and a 3 amp transformer so its a cheaper way to buy your pumps.

Fit one automatic pump on the hot pipe and its slave on the cold pump
Fit one automatic pump on the cold pipe and its slave on the hot pump