We had a hot water re-circulation pump by water heater before and had it removed last December when we detected leaks around it. This is our setup:
We have a return hot water line coming back to the closet where water heater is located. Currently this is capped. We also have a power connection box in this closet for a re-circulator.
I am looking for one that turns on when the temperature on the return line is below a threshold value (say 80 Fahrenheit). I also want this unit to turn on a timer say once in the morning and once in the evening. Plus it should have check valve to allow water from return line to heater ONLY.
Given these requirements, I looked at couple of brands that make circulators. I am confused. They have lot of mumbo jumbo about GPM, pressure ratings kinda details, but don't answer if they have temperature sensitive on/off support included or not. Nor do they specify if the unit comes with check valve.
Can someone who had gone through this exercise before point out any pitfalls when it comes to these sorts of systems?
This is for a rental home and I want to help my tenant.