Abstract: A system (10) for automatically filling a bathtub (14), is operatively arranged to supply heated water to the bathtub and to drain water from the bathtub through a drain outlet (12) after use, the system comprising a conduit (14b) through which water from the drain outlet is recirculated back to the bathtub in use. The bathtub outlet comprises a passageway having an upstream end connectable in fluid communication with the bathtub, a downstream end connectable to a drain (60) and a servo-actuated valve (34) disposed to control water flow through the passageway, the passageway comprising a branch (80) in fluid communication with it at a region between the upstream end and the servo-actuated valve. The branch may be used to fill the bathtub and/or for the water recirculation. Alternatively the bathtub overflow outlet (30) comprises an inlet (18) connectable to an external supply (50) of filling water and directing this filling water into the bathtub in use.