"but having three fail seems a little excessive" - you think? I have 4 E-10's on my bench. Well the motor, sans impeller. For some reason the bearing surface wears down and magnet starts rubbing on the casing - to the place where it won't spin up. Can I order a new impeller? Oh no, you have to buy a whole new pump for $180-$250. OK, just took a break, Spadepot, Grundfos $109+tax. I'll have to get some new tubing because Laing - in side, out center and Grundfos in center out side. Semi aside - last time I replaced my Laing I install a pair of 3/4" valves (plastic, red handle). One just after the flow switch and one in front of the heater. So, power off, both valves off and a my leisure remove the old pump, replumb/rewire etc. Now about the 2' of snow....