Different Water Heater Recirculation Methods

My manual says it's fine to install a recirculation line. I called Noritz and they said it will not void my warranty.
 
Hello all,
I'm new to all of this so forgive me if this is a stupid question.  
Using a tankless system connected to a point of use tank with recirc pump feeding back into the tank.  Is it possible to use the cold water feed thermostat as the switch for the pump?
 
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