Need Advice on Installing Shower Pump for Low Water Pressure

[Wingo123]

A universal pump is one that can deal with either negative or positive pressure due to the pressure vessel it uses - a positive pressure pump may struggle when the available gravity head of pressure (height of water in cold cistern above the outlet) is low.

Universal pumps tend to be more expensive too. If you can stretch to a monsoon then go for one of them, if not the ST shower mates aren't half bad but only run the shower from it.

Okay, thank you so much for your help. I appreciate it very much!