I have a teenage daughter whose showers are getting longer all the time and I am getting tired of fighting with her about taking all the hot water. Therefore, my question is about installing a device that controls the flow of hot water only to the shower that she uses.
I have already tried a water saving shower head and that didn't change anything. I want to install a variable flow control device that gradually cuts off hot water flow at various pre-set time intervals. As an electrician, I can figure out how to control it, but I'm just not sure if such a device exists.
Does anyone know of such a thing or have a better idea? Also, in the meantime, if I gradually close the inlet valve to my hot water heater while she is in the shower, do I run the risk of siphoning the water from the tank and doing damage to the tank?