When my wife and I met she lived in an apartment with an amazing shower. The pressure was good but the temperature was fantastic. I had never had an apartment shower with water that got so hot. I barely even went half-way on the knob before I was turning it down. I asked about it and her response was "oh yeah I complained to my dad and he looked at the heater, there was something on it that he broke off." Turns out there was some piece of plastic or something put on by the landlord to limit the top temperature of the water, so he took it off.

It didn't keep the hot water from running out but when you had it, it was great.