Thanks, Tim. Not sure if the same designations are available here but finding similar ones shouldn't be a problem.
That is terrible. Is it chronic or will rehab actually improve it?
Hair from the thirties? Eeewww!
If it's electrical it might have more than one heating elements and one of them could certainly fail while the rest are ok. Convection will bring the hotter water to the top of the tank where the drain is so the output will gradually cool as you use up the water.