Efficient shower tray with a static heat recovery device integrated in its surface, accessible and easy to clean that channels used water, causing it to run over the outer surface of a flat heat exchanger integrated in the surface of the tray, while cold water which is pre-heated before being mixed circulates inside the heat exchanger, reducing the quantity of hot water required and hence the energy required for heating water. The outer surface over which used grey water runs is accessible and easy to clean, thus ensuring simple and continuous maintenance, and the flat design of the heat exchanger allows the heat exchanger to be mounted flush with a surface, with a reduced height, and to be used without restrictions by persons having reduced mobility. The assembly can accommodate a grey water lifting pump in order to conduct the water for re-use or discharge.
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