Product review (5 stars): Works great
I'm kind of a home improvement guy who likes to tinker. We have a whole house recirculating hot water system running on a timer for two hours two times a day. I didn't like how it just ran on even though the water circuit would get hot so I made the outlet that the pump is connected to switched by this thing. Now when the water in the recirculating system gets hot, the pump shuts down.  I just wrapped the temperature probe to the water return pipe with tape.

So it saves the pipes, operates the pump less, and saves electricity. My plumber friend said recirculating pumps with the thermostat integrated into the design cost $400.

One thing not clearly noted on the description that is cool is the settings you enter into the controller do not get lost if power goes out.