no, from my own experience.
The nozzle is manually adjusted, so it’s pretty easy to set it to meet any need. I never really do though, I find it easy enough to just kind of shift on the seat and it does the trick.
It is compatible with all standard flat bottom seats with standard mounting bolts.
Yes. turn knob to nozzle cleaning
Sounds like you didnt turn the hot water back on.
Yes, my toilet is oblong and it fits perfectly.
connect the included hose to your water supply under your sink using supplied fittings.
Yes, a plastic tube is included and it’s fairly long. But I would have to drill a hole in the cabinet to attach the t-valve to the hot water line. The cold water where I live, is never really COLD, so it’s not a problem.