Radiant in slab heat- circ pump question

[dg55117]

My question is whether or not to leave the circ pump running during non heat cycle( therm is satisfied) or to have the pump only circulate fluid when heater is on?
800sqft well insulated-although high ceiling- in MN- 3 loops of about 270 ft only want to maintain around 45 degrees. I may have outsmarted myself by rewiring such that pump is always on and therm only turns on heater.
I used to have the therm control circ pump ( heater on in standby mode) and when heater sees flow it turns on.
Just wondering pros and cons- or correct way to do it
Thanks

 

[finn]

Get a Taco relay to turn the pump on with the thermostat.

 

[yeldogt]

Typically the pump runs all the time with outdoor reset -- there is no point is cycling the water if the boiler is not going to come on.