also look at salamander pumps, these are a very good quality pump.
also have a look at the aqualisa range of digital showers, this would mean changing your shower valve as well, since this is a shower valve c/w remote pump but they are a fantastic job, very reliable, great shower and easy replaced/repaired in the event of problems in later years.
The design the system & choosing the correct pump is more important than the make of the pump itself; even the best & most expensive pump won’t work properly on an incorrectly designed system.
ST are good, are at the top end but more expensive; Salamander are also very good (I actually an RHP) but can be more susceptible to problems with poor system design.
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