Device for domestic hot water distribution

A device for distributing domestic water comprising:

• a water receiver selected from the group consisting of a sink and a shower pan;
• and
• a heat exchanger of the water-water type that receives water from the water receiver, the heat exchanger comprising:
• a grey-water exchange portion arranged to be connected upstream to a drain plug for recovering domestic waste water, and downstream to a discharge conduit;
• a clean-water exchange portion arranged to be connected upstream to a cold water supply system, and downstream to a distribution valve, wherein the grey-water portion and the clean-water exchange portion are arranged to carry out heat transfer between the grey-water exchange portion and the clean-water exchange portion during water distribution caused by opening the distribution valve, and thus heating supply water to a first temperature;
• a first heating unit arranged within the clean-water exchange portion to complete the heating of the supply water simultaneously with water distribution, to heat a supply water to a second temperature greater than the first temperature;
• and
• a second heating unit arranged within the clean-water exchange portion to maintain, for a period without water distribution, the clean-water exchange portion and the water contained therein at a temperature at least equal to or greater than the first temperature, wherein each of the grey-water exchange portion and the clean-water exchange portion has two ends, and each of the two ends of the grey-water exchange portion and each of the two ends of the clean-water exchange portion is connected to one way of a corresponding valve, and wherein a second way of each valve is connected to the rest of the water circuit and a third way of each valve of the other end of the exchange portion in question through T connectors, to be able to reverse the flows in each exchange portion.