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It could be a total setup. That is, behind the scenes you don't know for sure where the water is going or how it is being pulled out of the cup.
The hot water side of that faucet might be connected to a pump or some other means to draw the water out, doesn't have to be backsiphonage
that is drawing the water (or whatever) into the domestic water system. The video was made to get as many hits on YT as possible is my guess.
The more sensational or provocative it is the more people will pass it around and the more views it will get.
Or, it could be 100% real. But with no audio explanation or reference to a print or tv news story its difficult to take at face value alone, at least for me.
Light is faster than sound. That's why some people seem really bright until you hear them speak.
--------------- “If I had my life to live over again, I'd be a plumber.” - Albert Einstein
--------- "Its a table saw.... Do you know where your fingers are?"
--------- sigpic http://www.helmetstohardhats.com/
All he did was shut off his water heater and start draining it.
I've seen a water heater colaspe from draining the system when the heater was on the roof of a 4 story building and they drained the system at ground level. Heaters have factory pressure temperature relief valves, but they don't come with vacuum relief valves.
Of course in reality, only a modern pull out faucet requires anti siphon technology. Not a swing spout 1" above the overflow level.
I might be dum or a couple of bricks short of a load but I don`t get it taps which are under pressure from either hot or cold water don`t siphone taps are designed to flow in one direction as the jumper valve and washer would seat itself preventing any water siphoning back through the tap into the supply pipe so all I can think of is this utube is a set up