I have a hot water circulating loop in my home that the plumbers did not insulate. Prohibitive propane costs keep me from even periodic circulation. The pump is currently controlled with a SmartThings Outlet and I use “Alexa” to call for hot water on demand. This command turns the pump on for 5 minutes only - just enough time to get water to the furthest fixture from the heater. This has improved my energy costs greatly but is somewhat inconvenient.
One solution is to simply add a larger capacity pump to improve delivery times and I will likely do this. However, I would also like to add a more efficient “modified” circulation mode.
My “modified circulation mode” would pulse the pump on/off based on the temperature at some desired point along the loop (likely the furthest fixture away from heater, but could be at any select fixture like kitchen sink, bath tub, etc.).
So, I need a Zwave or SmartThings device that would sense the outside temperature of the pipe or even perhaps have a probe that is mounted inside the pipe and communicate with the outlet connected to the pump.