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Originally Posted by unregistered
note that March, like C-Systems, has a motor with the 50,000 hr MTBF rating
- not the pump
March has an impeller spinning on a shaft
C-Systems has a steel shaft with a seal
- both weak links if going for 5 yrs service
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March's spinning on a shaft approach is the same as Eheim or Iwaki. Agreed that it may be a "weak point" if implemented improperly or with sub-standard materials but shaft operation does not automatically imply an inability to operate for ~5yrs non-stop service.
I would imagine the main reason why
serious industrial pump manufacturers don't offer exceptional claim guarantees is because their pumps normally get used for pumping all sorts of nasty stuff. Most of the sales engineers I've talked to tend to quote worst case figures to be safe, however if pressed for a clean-water circulation life-span, they've seemed to be a lot more confident in stating longer service times.
I tend to find that a mark of a quality manufacturer is one who will, by default, quote near worst case life-span scenarios, rather than start off by telling you how long it could last for in best-case scenarios.
Whew! Bank just revoked the $6K US charge. Am happier now.