Depending on space a mate installed these sort of bigger pumps in their old top floor flat.
https://www.screwfix.com/c/bathrooms-kitchens/shower-pumps/cat820270
It was brilliant.
The only issue is location and noise. Due to the layout theirs was in the boiler cupboard in the corridor so you didn't hear it from the bedroom or bathroom. Ymmv.
You need a tank for that.
@Howard started
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Depending on space a mate installed these sort of bigger pumps in their old top floor flat.
https://www.screwfix.com/c/bathrooms-kitchens/shower-pumps/cat820270
It was brilliant.
The only issue is location and noise. Due to the layout theirs was in the boiler cupboard in the corridor so you didn't hear it from the bedroom or bathroom. Ymmv.