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Within communities, timed taps and their maintenance are vital for energy savings.
In this case we are talking about mixer taps. For some time now, they are the ones that have been installed the most to carry water in safe conditions for users, since it is about avoiding the comfortable temperature zone for the proliferation of legionella (cold goes below that zone, and hot on top), producing the mixture only at the end.
NOTE 1: This incident can also occur in conventional thermostatic shower faucets, since they also need check valves as they close after mixing.
NOTE 2: In the video, reference is made in the hot water circuit to two shut-off valves and a recirculation as an expected installation, but in what is seen there is no such recirculation, so the water from the electric heater is simply cut off. .
NOTE 3: When in the first case the cold water is cut off in the false ceiling, it is mentioned that it is a check valve when it is evidently a shut-off valve. (it must be from carrying the retention ones in your mouth so much).
NOTE 4: This video is part of a course and should be understood as such.