I would look into the new DC pumps, controllable and use a lot less power to flow. Cost more up front but in the end are a lot cheaper when total costs.
I just purchased 2 of the Jabeo DCS Series pumps for my two setups. I haven't hooked them up yet but they have great reviews, energy efficient, quiet and not expensive.
DC pumps also work well with the icecap battery backup systems, main reason I purchased them.
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