An impeller pump won't pump without the compression/release cycles of the vane as it turns. Make it out of metal, it bends once and stays that way.
If you replace the impellers annually you won't have a problem. If you run the pump regularly, but not many hours you can probably get 2 years.
But I'm with you, there ought to be a better way. We just converted our Westerbeke genset to use a centrifugal air conditioning pump, a March Series 5 pump that matches our A/C pump. Powered by 120VAC, it runs when the genset engine runs. I've read where these work well for many years. I can't yet attest too much about the longevity of the genset application, other than it works. But the exact same pump on our A/C system has thousands of maintenance free hours.
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