Timed Automatic water shutoff valve

[TomD]

What is the best automatic shut off valve that you can install so that the hot water can used for, say, only 10 minutes? I'm tired of long showers being taken.

 

[EricE]

I don't know about automatic but you can shut this one off the Moen Flo Smart Home Water Monitoring, Alarm and Automatic Shutoff System from your phone.

https://www.moen.com/flo

It also has some other advantages - I'm out of town right now and wouldn't mind having something like that for peace of mind.