[stevehull]

NiHao,

I wish I knew if efficiency went down, up - or stayed the same. There is no question that my deep well pump cycles many hundreds of times a day. Pump data clearly shows that there are only so many off - on cycles before failure occurs.

The critical question is: will prevention of short cycling extend pump life?

I do know, because I measured it, that a restriction in the outflow water line decreases pump current linearly proportional to water flow. In contrast to a constant volume displacement pump (think pistons here), a centrifugal pump does not exhibit afterload effect.

In the long run, does longer cycling extend pump life? If so, that is a BIG issue as pulling a pump and replacing it is a MAJOR pain in the *** as well as expensive.

Steve