^^^ That's what I was thinking, its not really hour based, more of time duration sitting in the impeller housing. You figure most people average 40-50 hours a year on there boats. Every two season that would be close to 100 hours of use. My dealer recommends an impeller change every other year, for the $35 part I figure for peace of mind it is cheap insurance to just put a new one in. I know there are some people who put a new impeller in during winterization, my thought is it sits in the housing all winter squished down, possibly weakening it, this is the reason I do it in the spring. Knock on wood, five years of boat ownership and never have had one impeller fail.
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