I really do not like these.
Not because I would not want one, quite the contrary I would love one.
But each time I read a message I am reminded that to have one, I would need to tear down my bathroom wall and route a new circuit to behind the lav just to fit a GFCI to power the bloody thing!
Great idea but a silly lot of work.
How are licensed plumbers fitting these things without being licensed electricians? As a DIYer I dabble in both, but I doubt you all can professionally.
Direct me to a solar or battery-powered model and I will stand corrected.