I’ve gathered many detect the state of their hot water recirculation using a temp probe mounted to the return pipe. If that’s correct, then I need to identify which pipe is the return pipe. Is it one of the red ones circled here? Neither feel warm to the touch tho so I’m doubtful….any direction would be helpful! Also would appreciate any recommendations on temp sensors to use.
And open to any other ways you might know of to reliably detect the state of recirculation. Thanks!
