I've got a Taco 007 circulator on a SlantFin gas-fired boiler, 145,000BTE D.O.E, 125,000BTU for water. Furnace is not doing potable hot-water. Unit installed mid-1999.

If it runs for 20 mins straight, I swear the circulator gets hotter than the water-output of the furnice (which is 180degrees)

Does its temp. indicate a problem?