That's what I do now, but it's a pain to do this manually every time.
I could also forgo the flow sensor and just attach a temp sensor to the
hot water pipe by the shower and sense an increase in temperature to
start the timer on the micro-controller going.
The hassle is that I have to plumb in the valve. But it backs up to
closet so I can put in an access panel to get to the plumbing.
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