Feedback for cheap, compact electric heating faucets
First, it's Alibaba, for Pete's sake. Do you even have to ask? 

Even if we take this product seriously, I think it's too much heater crammed in too little space.  Either they're wildly sacrificing safety standards, or they are constricting flow down to a trickle.  Or both.   

If such a thing were made by a reputable manufacturer such as Siemens, GE, Chromalox, etc., I would expect a plain faucet as a head-unit, and the guts of the machine to be under the sink.  

3000W is certainly not enough energy budget to get a water flow you would consider "reasonable" at a sink faucet.  Go look up the flow vs temperature-rise data that is readily avaialable on the Web.  You'll see 3kw is not enough.