I understand what you're saying 8-ball. I still think the "tank" idea to be the best of both. Even with uneven pumps, which even identical pumps are not going to be equal, wouldn't both pumps pumping into a mutial tank with one combined outlet give you both added pressure and redundancy? That is with both pumps having seperate supply lines to the reservoir. Maybe I'm wrong on the pressure being combined on the tank outlet. Don't see problem with that setup other than if one pump fails but then all you'd have to thave is a one way shutoff valve on each pump.
Obviously series is the easiest setup, I'm just considering doing a similar thing with multiple loops and a distribution manifold. If the tank idea is not totally off base then I could run multiple lines out to the 2 loops.
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"The more I learn the less I know, but I never knew as much as when I was sixteen"
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