Power Shower eeewww NO !

We have never fitted one where the customer did not complain about the noise - with the pump inside the shower unit right next to your ear it's not surprising you want to get in and out quickly. Mira & Triton only offer a 12 month guarantee on new power showers hmm. If you got on that's failed again then consider an inline shower pump and a bar shower- 

Far more reliable Or treat yourself to a quality Salamander pump & premium Triton Shower Bar