595444 3/4-Inch Clip-On Aquastat Control

Works well to run my circulator pump.

I can't believe I used my recirculation pump for years without this! Why run the pump when you already have hot water throughout the system? Adding this has reduced pump run-time by probably 90% for us. We do have the hot water and return lines fully insulated, which helps, and live in CA so temps aren't extreme, so your experience may vary. What a huge savings in pump run time and electricity usage. I calculate that this pays for itself in well under a year. It would be nice if you could tune the temperature, but this is really a minor point, perhaps for a future improvement.

Very good product. Does the task

GREAT PART

Easy instructions and straightforward setup. Runs as it should.