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Grundfos zone pump burning keeps out
Anyone had this problem. Have a system with 3 Grundfos zone pumps where one keeps burning out. Pumps are mounted to a 1" manifold with 3/4" branches. From manifold is an isolation valve followed by a 90 degree elbow pointing up. Elbow is followed by a swing check valve followed by the pump. Problem pump is the far right one. Have replaced it 3 times, last time in May 2011. Have flushed loop with plenty of flow to get all air out. Loop is 250 long with 3/4 tubing, type unknown. Pump is a UP15-29SU, original may have been a UP15-18SU. Amp draw is spot on with spec's. Pump run very-very hot and thinking it is just a matter of time before this one burns out too. An help would be appreciated.