What is the correct design/operation of a circ pump on a domestic hot water system?
Admittedly, I am not a plumber.
The way I see it:
Domestic hot water is run out/away from the hot water tank to the home. A return line brings the water back and dumps it into the inlet of hot water tank.
Circ pump moves the water; controlled by a thermostat.
The home I am working on has the domestic hot water circ pump wired together with the heating circ pumps. Domestic hot circ pump only runs when boiler runs.
Solution: place a thermostat (clamp-on type) on the hot return line to control the domestic hot water circ pump?
Is this correct?