Abstract: A water supply device for showers and the like is provided. The device allows an eased adjustment of the water temperature and an effective prevention of the formation of bacterial colonies, specifically of legionella, and to this purpose it comprises: a branched line, downstream said adjustment means of the water flow, connecting the water supply device and a drain to each other through a dedicated line; means for deviating the water flow at said branched line, apt to deviate the water flow towards either the rose or the drain; and temperature detection means, placed between said adjustment means and said branched line or on said dedicated line, connected to temperature display means.