The pool. Seawater pools advertised as heated in the thalasso centre, over three floors, with hydromassage jets; whirlpool bath and an outdoor pool open in season.
The hot tub. Whirlpool bath.
Hotels.com gives 9.2/10 from 184 reviews and Staycation 9.4/10 from 62 reviews. I haven't yet found guest reviews that mention the water temperature.
Guide's tip. The outdoor pool only opens in season: the heated pools are the thalasso ones.