Water conservation for Boondocking (Hollywood showers)

[somewhereinusa]

This is the valve I bought.

https://www.ebay.com/itm/3-way-motorized-ball-valve-DN15-reduce-port-electric-ball-valve-T-Port/272827587291?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

This temp switch

https://www.ebay.com/itm/5x-Temperature-Switch-Control-Sensor-Thermal-Thermostat-35-C-160-C-NO-NC-KSD301/372458712325?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

Normally open switch, I used 45° C. If it works backwards switch the leads on ball valve.

Yes to operating instructions

[oltrunt]

Dick, great minds and all that--I used the same DN 15 valve to control water flow in my OTR heater.  I can see how it would lend itself to the water recycling need although I went with a solenoid valve there.  I also used the same thermocouples in my generator over temp shut down system.  I found that they took too long to revert to be satisfactory for controlling domestic water temps.  For that I went with a digital temp controller (+/_ 1 degree C).  Jack